Updated on 2025/12/17

写真a

 
TAKAGI HIROSHI
 
Organization
School of Environment and Society Professor
Title
Professor
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Research Areas

  • Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Disaster prevention engineering

Papers

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MISC

  • Storm surge due to 2013 typhoon Yolanda (Haiyan) in Leyte Gulf, the Philippines

    Hiroshi Takagi, Mario De Leon, Miguel Esteban, Takahito Mikami, Ryota Nakamura

    Handbook of Coastal Disaster Mitigation for Engineers and Planners   133 - 144   2015.7

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    Language：English   Publisher：Elsevier Inc.  

    DOI： 10.1016/B978-0-12-801060-0.00008-3

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  • ANALYSIS OF THE 2013 TYPHOON YOLANDA (HAIYAN) AND SUBSEQUENT STORM SURGE

    TAKAGI Hiroshi, MIKAMI Takahito, SHIBAYAMA Tomoya, MATSUMARU Ryo, LEON Mario de, ESTEBAN Miguel, NGUYEN Thao Danh, NAKAMURA Ryota

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)   Vol. 70 ( No. 2 )   I_1206 - I_1211   2014.10

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    Language：Japanese   Publisher：Japan Society of Civil Engineers  

    ?Typhoon Yolanda made landfall in Leyte Island at near peak strength, with maximum sustained wind speeds of 160 knots, the largest in the recorded history of the Western North Pacific. Yolanda approached very quickly with a forward speed of 41km/hr towards Leyte, which was also the largest among typhoons with similar intensities. As a result of these extreme gusts and the exceptionally low central pressure of the typhoon, Yolanda caused the largest storm surge in the recorded history of Philippines. The spatial distribution of storm surges occurred in Leyte Gulf shows reasonable agreement between the field survey conducted by the authors and the storm surge simulation with an empirical typhoon model.

    DOI： 10.2208/jscejoe.70.I_1206

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  • STUDY ON DISASTER INFORMATION DISSEMINATION AND PEOPLE'S RESPONSE FOR EVACUATION ?THE CASE OF THE 2013 TYPHOON YOLANDA (HAIYAN)?

    ESTEBAN Miguel, MATSUMARU Ryo, TAKAGI Hiroshi, MIKAMI Takahito, SHIBAYAMA Tomoya, LEON Mario, P. de, VALENZUELA Ven Paolo, NGUYEN Thao Danh

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)   Vol. 70 ( No. 2 )   I_1218 - I_1223   2014.10

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    Language：Japanese   Publisher：Japan Society of Civil Engineers  

    ?In November 2013, Typhoon Yolanda (Haiyan) struck the central part of the Philippines and caused devastating damage to coastal settlements and infrastructure. The authors conducted a field survey about one month after the disaster to understand the behavior of government authorities and local residents during the event, by gathering existing information and interviewing local residents and officials, mainly in the islands of Layte and Samar. The main conclusions of the analysis carried out can be summarized as follows: 1) the government disseminated information, including a disaster warning and evacuation instructions, in line with the rules preset by the government, however, 2) there was an issue on the information dissemination through the government channel, 3) there was also some issues related to the level of knowledge and awareness by local residents on what is a "storm surge", the threat it posed, and the necessity for evacuation, and 4) the present study indicates that it is necessary to inform the public more clearly and realistically about the exact nature of the disaster phenomenon.

    DOI： 10.2208/jscejoe.70.I_1218

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  • Climate change adaptation in Tokyo Bay: The case for a storm surge barrier

    Miguel Esteban, Takahito Mikami, Tomoya Shibayama, Hiroshi Takagi, Sebastiaan N. Jonkman, Mathijs Van Ledden

    Proceedings of the Coastal Engineering Conference   2014-January   2014.1

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  • Comparison between simulation of storm surge invoked by typhoon "Yolanda" and field results

    NAKAMURA Ryota, OYAMA Takahiro, SHIBAYAMA Tomoya, MATSUMARU Ryo, TAKAGI Hiroshi, ESTEBAN Miguel, MIKAMI Takahito

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   70 ( 2 )   I_236 - I_240   2014

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    Language：Japanese   Publisher：Japan Society of Civil Engineers  

    The catastrophic typhoon "Yolanda" on Nov. 2013 invoked storm surge in the coastal area of the Philippines. The storm surge made the coastal regions to the devastation and maximum water height reached 5m in the Tacloban area. This paper presents the comparison between storm surge simulated results from atmospheric - storm surge- wave- tide coupled model and the observation measured by The 2013 Philippines Storm Surge Joint Survey Group headed up by Prof T. Shibayama. In this study, the TC-Bogus scheme is used in order to simulate accurate typhoon. The simulated storm surge results reached almost 5m in the Tacloban area. The coupled model including TC-Bogus scheme gives accurate simulations for estimating storm surge.

    DOI： 10.2208/kaigan.70.I_236

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  • FIELD SURVEY AND ANALYSIS OF STORM SURGE CAUSED BY THE 2013 TYPHOON YOLANDA (HAIYAN)

    SHIBAYAMA Tomoya, MATSUMARU Ryo, TAKAGI Hiroshi, LEON Mario P. de, ESTEBAN Miguel, MIKAMI Takahito, OYAMA Takahiro, NAKAMURA Ryota

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)   70 ( 2 )   I_1212 - I_1217   2014

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    Language：Japanese   Publisher：Japan Society of Civil Engineers  

    ?In November 2013, Typhoon Yolanda (Haiyan) struck the central part of the Philippines and caused severe damage to coastal areas due to storm surge and strong wind. In this paper, the results of the field survey conducted one month after the disaster were summarized. Storm surge heights were more than 5 m along the inner part of Leyte Gulf, and severe damage was observed in the areas where storm surge heights were more than 3 m. One of the characteristic features of this disaster was devastating storm surge induced by rapid change of wind direction.

    DOI： 10.2208/jscejoe.70.I_1212

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  • Comparison between simulation of storm surge invoked by typhoon "Yolanda" and field results

    NAKAMURA RYOTA, OYAMA TAKAHIRO, SHIBAYAMA TOMOYA, MATSUMARU RYO, TAKAGI HIROSHI, ESTEBAN MIGUEL, MIKAMI TAKAHITO

    土木学会論文集 B2(海岸工学)(Web)   70 ( 2 )   I.236-I.240 (J-STAGE) - I_240   2014

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    Language：Japanese   Publisher：Japan Society of Civil Engineers  

    The catastrophic typhoon "Yolanda" on Nov. 2013 invoked storm surge in the coastal area of the Philippines. The storm surge made the coastal regions to the devastation and maximum water height reached 5m in the Tacloban area. This paper presents the comparison between storm surge simulated results from atmospheric - storm surge- wave- tide coupled model and the observation measured by The 2013 Philippines Storm Surge Joint Survey Group headed up by Prof T. Shibayama. In this study, the TC-Bogus scheme is used in order to simulate accurate typhoon. The simulated storm surge results reached almost 5m in the Tacloban area. The coupled model including TC-Bogus scheme gives accurate simulations for estimating storm surge.

    DOI： 10.2208/kaigan.70.I_236

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  • 途上国防災の現実と課題―土木と国際開発の2つの視点から―

    高木泰士

    土木技術   68 ( 3 )   85 - 88   2013.3

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    Language：Japanese  

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  • Realities and Problems for Disaster Risk Reduction in Developing Countries : Two Different Perspective : Civil Engineering and International Development

    68 ( 3 )   85 - 88   2013.3

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  • INFLUENCE OF OCEAN TIDE AND SEA-LEVEL RISE ON FLOOD IN URBAN AREAS OF MEKONG DELTA

    TAKAGI HIROSHI, TY TRAN VAN, THAO NGUYEN DANH, ESTEBAN MIGUEL, TAKAHASHI YUTO

    土木学会論文集 B3(海洋開発)(Web)   69 ( 2 )   I.988-I.993 (J-STAGE) - I_993   2013

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    Language：Japanese   Publisher：Japan Society of Civil Engineers  

    The present paper investigates the vulnerability of urban areas in the Mekong Delta to inundation due to seasonal flooding, a phenomenon which is likely to be exacerbated by future sea-level rise. The research reveals that ocean tides predominantly determine water elevation even in an upstream location such as Can Tho City, 80 km inland from the river mouth, and that the river flow causes tidal damping and effectively reduces the energy of the incoming tides. This tidal damping is especially pronounced during the rainy season. Analysis based on the water levels monitored by the Mekong River Commission revealed that the ground near the riverbank of Can Tho City had experienced inundation for a total of 215 hours between July 2009 and June 2010 (2.5 % of the time over a one year period). Assuming three scenarios of SLR of 20, 40, and 60 cm, all within the range of the IPCC AR4's projections, it was found that the duration of inundation will be prolonged from the present percentage of 2.5 % to 6, 13.2, and 23.9% of the year, respectively. It is thus feared that in the future inundation can occur during any season of the year, whereas it is mostly limited to the rainy season under present sea levels. Furthermore, the field survey carried out by the authors shows that inundation reached up to a height of 47 cm above the roads of Can Tho downtown on November 2009. Such flooding can influence daily life, agriculture and traffic in the region and an increase in their frequency and height due to sea-level rise can have negative consequences on the socio-economic conditions of the inhabitants of the delta.

    DOI： 10.2208/jscejoe.69.I_988

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  • ESTIMATION OF STORM SURGE AND PROPOSAL OF THE COASTAL PROTECTION METHOD IN TOKYO BAY

    HOSHINO SAYAKA, SHIBAYAMA TOMOYA, ESTEBAN MIGUEL, TAKAGI HIROSHI, MIKAMI TAKAHITO, TAKABATAKE TOMOYUKI

    土木学会論文集 B3(海洋開発)(Web)   69 ( 2 )   I.994-I.999 (J-STAGE) - I_999   2013

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    Language：Japanese   Publisher：Japan Society of Civil Engineers  

    Sea level rise and an increase in typhoon intensity are two of the expected consequences from future climate change. In the present work a methodology to change the intensity of tropical cyclones in Japan was developed, which can be used to assess the inundation risk to different areas of the country. An example of how this would affect one of the worst typhoons to hit the Tokyo Bay area in the 20th century was thus developed, highlighting the considerable dangers associated with this event, and how current sea defences could be under danger of failing by the end of the 21st century. The present results show how this level of defences could be inadequate by the end of the 21st century. Possible solutions to this problem involve raising the level of existing defences or increasing the ground level of reclamated area. The cost of possible countermeasures are calculated and are compared with possible economic loss under flooding. The cost is less than 1 % of possible economic loss in Tokyo metropolitan and 6 % in Kanagawa prefecture.

    DOI： 10.2208/jscejoe.69.I_994

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  • Characteristics of 2011 Tohoku Tsunami and Resultant Damage in Tokyo Bay

    SASAKI Jun, ITO Kazunori, SUZUKI Takayuki, WIYONO Retno, Utami Agung, ODA Yukinobu, TAKAYAMA Yuriko, HASUMI Kanako, FURUTA Atsushi, TAKAGI Hiroshi

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   Vol. 68 ( No. 2 )   I_261 - I_265   2012.11

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    Language：Japanese   Publisher：Japan Society of Civil Engineers  

    Characteristics of the 2011 Tohoku Earthquake tsunami and resultant damage on the coast of Tokyo Bay were studied using a field survey, an analysis of observed tsunami wave profiles and numerical hindcasting using FVCOM. The tsunami was found to overflow in several fishery ports, leading to unexpectedly high inundation and runup heights of 2.84 m and 2.91 m in Funabashi Fishery Port and Shin-Futtsu Fishery Port, respectively. The observed tsunami wave profiles indicated that the tsunami wave entered the bay with a period and a maximum height of approximately 60 min and 0.9 m, respectively, and propagated along the major axis with nearly uniform height, while the wave was amplified in ports, which characteristics were successfully reproduced by numerical hindcasting.

    DOI： 10.2208/kaigan.68.I_261

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  • 2011年東北津波による東京湾への影響

    佐々木淳, 伊藤一教, 鈴木崇之, WIYONO Retno, Utami Agung, 織田幸伸, 高山百合子, 横田華奈子, 古田敦史, 高木泰士

    日本沿岸域学会研究討論会講演概要集(CD?ROM)   ( 25 )   ROMBUNNO.10-5   2012

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  • ASSESSMENT OF THE COASTAL DISASTER RISKS IN SOUTHERN VIETNAM

    KOBOKU YASUSHI, MIKAMI TAKAHITO

    土木学会論文集 B3(海洋開発)(Web)   68 ( 2 )   I.888-I.893 (J-STAGE) - I_893   2012

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    Language：Japanese   Publisher：Japan Society of Civil Engineers  

    Vietnam has a long coastline that stretches from north to south and thus is a country highly susceptible to coastal disasters. However, the southern part of Vietnam has generally been perceived to be less vulnerable to typhoons or storm surges compared to the northern and central parts of the country. The authors tried to understand the actual vulnerability of this southern coastline to coastal disasters, in particular storm surge, through the field surveys and numerical simulations. Through the field survey it was evident that there are a number of settlements at risk, such as a number of houses standing on a severely eroded beach and a village located in a low-lying river bank. The interviews with local residents revealed that people living there were not concerned about typhoons, while a typhoon track analysis shows that a substantial number of typhoons have approached southern Vietnam in the past. The authors estimated that the highest water elevation due to storm surges in the past 6 decades was approximately one meter by performing the numerical simulation. It is feared that these vulnerable local communities could be devastated by a storm surge accompanied by strong waves if the past biggest class typhoon occurs.

    DOI： 10.2208/jscejoe.68.I_888

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  • Field Survey of the 2011 off the Pacific Coast of Tohoku Earthquake Tsunami Disaster to the South of Miyagi Prefecture

    SHIBAYAMA Tomoya, MATSUMARU Ryo, TAKAGI Hiroshi, ESTEBAN Miguel, MIKAMI Takahito

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)   Vol. 67 ( No. 2 )   I_1301 - I_1305   2011.11

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    Language：Japanese   Publisher：Japan Society of Civil Engineers  

    On March 11, 2011, a large earthquake of magnitude 9.0 took place, generating a tsunami that caused a severe damage to the east coast of Japan. To comprehensively record tsunami trace heights along the coastal region, the 2011 Tohoku Earthquake Tsunami Joint Survey Group was organized. The authors conducted field surveys as a part of this group in Miyagi, Fukushima, Ibaraki and Chiba prefectures. In this paper, the results of these surveys are reported. Inundation heights were more than 10 m in the north part of Miyagi, 5 to 10 m along the coast of Sendai Bay and around 5 m in Ibaraki and Chiba. Buildings, including reinforced concrete structures, were washed away and ships were stranded in land. Coastal structures such as dikes and coastal forests also suffered extensive damage.

    DOI： 10.2208/kaigan.67.I_1301

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  • 2011年東北地方太平洋沖地震による津波災害の宮城県以南における現地調査

    柴山知也, 松丸亮, 高木泰士, ESTEBAN Miguel, 三上貴仁

    土木学会論文集 B2(海岸工学)   67 ( 2,Pt.2 )   I.1301-I.1305   2011.10

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  • Increase in Port Downtime and Damage in Vietnam Due To a Potential Increase in Tropical Cyclone Intensity

    Miguel Esteban, Nguyen Danh Thao, Hiroshi Takagi, Tomoya Shibayama

    Climate Change Management   101 - 125   2011.9

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    Language：English   Publisher：Climate Change and the Sustainable Use of Water Resources, Leal Filho, Walter (Ed.)  

    DOI： 10.1007/978-3-642-22266-5_7

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  • CE reports: The project for nationwide dissemination of traditional riverbank protection methods in Lao PDR

    TAKAGI Hiroshi, SHIMANO Toshiyuki

    JSCE magazine   96 ( 6 )   93 - 95   2011.6

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  • ラオス国における河川伝統工法の全国普及と河岸侵食対策への取組み

    高木泰士, 島野敏行

    土木学会誌   96 ( 6 )   93-95 - 95   2011.6

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  • ASSESSMENT OF FUTURE STABILITY OF BREAKWATERS UNDER CLIMATE CHANGE

    TAKAGI HIROSHI, KASHIHARA HIDEHIRO, ESTEBAN MIGUEL, SHIBAYAMA TOMOYA

    53 ( 1 )   21 - 39   2011.3

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  • Modification of the Goda formula to evaluate the movement of a caisson breakwater protected by failed armour

    Miguel Esteban, Hiroshi Takagi, Tomoya Shibayama

    Coasts, Marine Structures and Breakwaters: Adapting to Change - Proceedings of the 9th International Conference   2   402 - 413   2010.12

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  • Modified Goda formula to simulate sliding of composite caisson breakwater

    Miguel Esteban, Hiroshi Takagi, Tomoya Shibayama

    Proceedings of the Coastal Engineering Conference   2010.12

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  • サモア諸島沖地震津波の調査と分析

    柴山知也, 三上貴仁, 松丸亮, 高木泰士, LATU Faainuseiamalie

    土木学会論文集 B2(海岸工学)   66 ( 1,Pt.2 )   1376-1380 - 1380   2010.10

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    Language：Japanese   Publisher：Japan Society of Civil Engineers  

    This paper aims to understand the characteristics of the tsunami disaster in the Samoan Islands by analyzing the field survey data as well as numerical simulation results. The field survey was performed about one month after the disaster to clarify the tsunami wave height and to understand the reality of the disaster according to the residents. As a result, the followings are concluded. 1) Tsunami height exceeded 5m in a wide area of Upole and Tutuila Islands. 2) In areas that have a wide coral reef, people saw the wave breaking on top of it and quickly became aware of the approaching tsunami. 3) Tsunami education contributed the residents' reaction on the evacuation. 4) Social characteristics especially existence of Matai (the chief of the village) influenced the residents' decision making after the tsunami disaster.

    DOI： 10.2208/kaigan.66.1376

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  • 海岸侵食対策を通じた気象・海象災害への対応

    高木 泰士

    土木學會誌   95 ( 8 )   25 - 25   2010.8

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  • サイクロンNARGISによる高潮調査と氾濫挙動の分析

    柴山知也, 青木陽平, 高木泰士

    海洋開発論文集   26   429-434   2010.6

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  • DISASTER SURVEY AFTER THE CYCLONE NARGIS IN 2008

    Tomoya Shibayama, Hiroshi Takagi, Ngun Hnu

    PROCEEDINGS OF THE 5TH INTERNATIONAL CONFERENCE ON ASIAN AND PACIFIC COASTS, VOL 2   2   190 - +   2010

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  • Pressure exerted by a solitary wave on the rubble mound foundation of an armoured caisson breakwater

    Miguel Esteban, Nguyen Danh Thao, Hiroshi Takagi, Tomoya Shibayama

    Proceedings of the International Offshore and Polar Engineering Conference   1137 - 1144   2009.12

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  • サイクロンNargisによる高潮被害の調査

    柴山知也, 高木泰士, HNU Ngun, 青木陽平

    海岸工学論文集   56 ( 2 )   1376-1380 - 1380   2009.10

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  • 港湾構造物に及ぼす気候変動の影響とその定量的予測?防波堤を対象として?

    高木泰士, 柏原英広, 柴山知也

    海岸工学論文集   56 ( 2 )   891-895 - 895   2009.10

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  • Quantitative evaluation of vulnerabilities in coastal structures due to climate change: case studies for breakwaters

    TAKAGI Hiroshi, KASHIHARA Hidehiro, SHIBAYAMA Tomoya

    Journal of coastal engineering, JSCE   56 ( 1 )   891 - 895   2009.10

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    Language：Japanese   Publisher：Japan Society of Civil Engineers  

    Climate change is expected to lead to increases in both sea level and typhoon intensity. Such changes may threaten the stability of breakwaters. In this study, calculations using the SWAN model showed that a 10% increase in wind speed can lead to a 20% increase in wave height. The expected sliding distances for the breakwaters at Shibushi Ports were estimated using a probabilistic method proposed by Takagi et al. (2008). It is noteworthy that in the future sliding distances may become three times greater than current ones due to a combination of increases in sea level and wave height.

    DOI： 10.2208/kaigan.65.891

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  • サイクロンNargisによる高潮の被害と将来への教訓

    柴山知也, 高木泰士, HNU Ngun

    日本沿岸域学会研究討論会講演概要集   ( 22 )   119-120   2009.7

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  • 高い経済成長の渦中にあるベトナムの沿岸域開発の現状

    高木泰士, NGUYEN Danh Thao, LE VAN Cong

    沿岸域学会誌   21 ( 4 )   113-119 - 119   2009.3

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  • 2008年サイクロンNargisの被災状況調査

    柴山知也, 高木泰士, HNU Ngun

    防災研究フォーラムシンポジウム講演要旨集   7th   3-4   2009

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  • PROPOSED METHODOLOGY FOR EVALUATING THE POTENTIAL FAILURE RISK FOR EXISTING CAISSON-BREAKWATERS IN A STORM EVENT USING A LEVEL III RELIABILITY-BASED APPROACH

    Hiroshi Takagi, Miguel Esteban, Tomoya Shibayama

    COASTAL ENGINEERING 2008, VOLS 1-5   3655 - +   2009

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  • IMPACT PRESSURES DUE TO BREAKING SOLITARY WAVE EXERTED ON A VERTICAL WALL

    Nguyen Danh Thao, Miguel Esteban, Hiroshi Takagi, Tomoya Shibayama

    COASTAL ENGINEERING 2008, VOLS 1-5   3186 - +   2009

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  • Report of the Field Investigation after the Cyclone Nargis in 2008

    SHIBAYAMA Tomoya, TAKAGI Hiroshi, HNU Ngun

    Journal of Japan Society for Natural Disaster Science   27 ( 3 )   331 - 338   2008.11

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    Language：Japanese   Publisher：Japan Society for Natural Disaster Science  

    The cyclone 'Nargis' hit the southern part of Myanmar on May 2^<nd> and 3^<rd> 2008. This devastating cyclone caused enormous number of casualties as well as fatal damages to houses and paddy fields, particularly both the downstream areas of the Irrawaddy and Yangon Rivers. In the present field survey, thought the activities were limited to the area near Yangon city due to certain government restrictions, it was found that the tide due to the storm surge was probably up to 3-4m around 50 kilometers upstream of the river mouth of Yangon River. According to interviews with the local residents, it also appears that significant flooding took place at inland areas as a result of the upsurge through the tributaries or channels from the main river. Even though the situation was catastrophic, it seems that most residents had not evacuated. One of the reasons for this could be related to the fact that the cyclone passed through the area investigated in the late night to the early morning of May 3^<rd>. Another reason might be because of an underestimation or the lack of perception of the threat of storm surge. Apart from the investigation, the tracks for the present and past cyclones (1945-

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  • Report of the Field Investigation after the Cyclone Nargis in 2008

    SHIBAYAMA TOMOYA, TAKAGI HIROSHI, HNU NGUN, HNU NGUN

    自然災害科学   27 ( 3 )   331-338 - 338   2008.11

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    The cyclone 'Nargis' hit the southern part of Myanmar on May 2^<nd> and 3^<rd> 2008. This devastating cyclone caused enormous number of casualties as well as fatal damages to houses and paddy fields, particularly both the downstream areas of the Irrawaddy and Yangon Rivers. In the present field survey, thought the activities were limited to the area near Yangon city due to certain government restrictions, it was found that the tide due to the storm surge was probably up to 3-4m around 50 kilometers upstream of the river mouth of Yangon River. According to interviews with the local residents, it also appears that significant flooding took place at inland areas as a result of the upsurge through the tributaries or channels from the main river. Even though the situation was catastrophic, it seems that most residents had not evacuated. One of the reasons for this could be related to the fact that the cyclone passed through the area investigated in the late night to the early morning of May 3^<rd>. Another reason might be because of an underestimation or the lack of perception of the threat of storm surge. Apart from the investigation, the tracks for the present and past cyclones (1945-2007) have been analyzed based on a string of best track data. The results reveal that quite a small number of cyclone (roughly 2 times on average every 10 years) have hit the southern coast of Myanmar compared to the number of cyclones that hit the coast of Bangladesh, and that the route that Nargis traced is rather unique.

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  • 東京湾における陸棚波に起因した異常潮位の分析とその将来影響

    高木泰士, 木津翔平, 柴山知也

    海岸工学論文集   55 ( 2 )   1306-1310 - 1310   2008.10

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    Language：Japanese   Publisher：Japan Society of Civil Engineers  

    Abnormal tides wherein the water level remains high for a few days despite the absence of remarkable meteorological disturbances may occur due to incoming continental-shelf waves. In this study, it is assumed that the continental-shelf wave can be initiated off the Choshi coast; this wave will subsequently reach Tokyo Bay. First, the characteristics of tide anomalies are discussed on the basis of tide, wind, atmospheric pressure, and wave data obtained near Choshi. Second, several obvious cases of water-level propagation from Choshi to Tokyo Bay are collected by scrutinizing the tidal data at both stations. Finally, it is discussed how the adverse effects of abnormal tides induced by the continental-shelf waves may appear to be more serious if the sea level rise is dramatic.

    DOI： 10.2208/proce1989.55.1306

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  • ESTIMATION OF STABILITY PERFORMANCE OF EXISTING BREAKWATERS USING A RELIABILITY APPROACH AND PROPOSAL OF EFFECTIVE COUNTERMEASURES TO PREVENT FUTURE FAILURES

    TAKAGI HIROSHI

    土木学会論文集 B(Web)   Vol. 65 ( No. 3 )   246 - 258   2008.7

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    DOI： 10.2208/jscejb.65.246

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  • ミャンマー・サイクロン高潮災害緊急調査報告(速報)

    柴山 知也, 高木 泰士, ムン ヌゥ

    土木学会誌   93 ( 7 )   41 - 42   2008.7

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  • 事故・災害 2 ミャンマー・サイクロン高潮災害緊急調査報告(速報)

    柴山知也, 高木泰士, ムン ヌゥ, ムン ヌゥ

    土木学会誌   93 ( 7 )   41-43,6-7 - 42   2008.7

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  • The Execution Example of the Ground Improvement "Curve Inducement Drilling Method" under the Established Structure

    UEDA KATSUNORI, TAKAGI HIROSHI

    土と基礎   56 ( 3 )   14-17 - 17   2008.3

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    Language：Japanese  

    Japan is one often regions which are most prone to earthquakes. When we use a conventional straight bowling for a liquefaction-resistant ground injection, it is difficult to improve a ground immediately below the structure. We developed "Curve・Inducement・Drilling・method" that is a new method to improve the ground under existing structures. This report introduces a summary of the development technology and a example application of this new method.

    CiNii Books

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  • The Execution Example of the Ground Improvement "Curve・Inducement・Drilling・Method" under the Established Structure(<Theme>Reinforcement of Existing Foundations)

    Ueda Katsunori, Takagi Hiroshi

    Soil mechanics and foundation engineering   56 ( 3 )   14 - 17   2008.3

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    Language：Japanese   Publisher：The Japanese Geotechnical Society  

    Japan is one often regions which are most prone to earthquakes. When we use a conventional straight bowling for a liquefaction-resistant ground injection, it is difficult to improve a ground immediately below the structure. We developed &quot;Curve・Inducement・Drilling・method&quot; that is a new method to improve the ground under existing structures. This report introduces a summary of the development technology and a example application of this new method.

    CiNii Books

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  • Analysis of Rubble Mound Foundation Failure of a Caisson Breakwater Subjected to Tsunami Attack

    Miguel Esteban, Nguyen Danh Thao, Hiroshi Takagi, Tomoya Shibayama

    PROCEEDINGS OF THE EIGHTEENTH (2008) INTERNATIONAL OFFSHORE AND POLAR ENGINEERING CONFERENCE, VOL 4   528 - +   2008

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  • Laboratory Experiments on the Sliding Failure of a Caisson Breakwater Subjected to Solitary Wave Attack

    Miguel Esteban, Nguyen Danh Thao, Hiroshi Takagi, Tomoya Shibayama

    PROCEEDINGS OF THE EIGHTH (2008) ISOPE PACIFIC/ASIA OFFSHORE MECHANICS SYMPOSIUM: PACOMS-2008   291 - +   2008

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  • IMPROVEMENT IN CALCULATION OF RESISTANCE FORCE ON CAISSON SLIDING DUE TO TILTING

    ESTEBAN MIGUEL, TAKAGI HIROSHI, SHIBAYAMA TOMOYA

    Coastal Engineering Journal   49 ( 4 )   417 - 441   2007.12

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    Language：English  

    CiNii Books

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  • レベル3信頼性設計法を用いた防波堤全体系の最適化手法

    高木泰士

    海岸工学論文集   Vol. 54 ( No. 2 )   911-915   2007.11

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  • 直立防波堤への衝撃波力の算定方法の提案

    THAO Nguyen Danh, 高木泰士, 柴山知也

    海岸工学論文集   54 ( 2 )   811-815 - 815   2007.10

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    Language：Japanese   Publisher：Japan Society of Civil Engineers  

    Breaking waves on coastal structures produce impulse pressures that are high in magnitude and short in duration, compared with pressures exerted by non-breaking waves. The present study is concerned with a theoretical approach, which is based on the momentum impulse, to simulate the impact pressures on a vertical wall. The theoretical impact pressures are determined using varied velocity before impact process. The velocity field in the vicinity of structure is calculated by LES model including turbulence. The necessary coefficient λ* to evaluate impulse pressures is tentatively obtained through a comparison between the laboratory tests and the numerical results. The computational results using the coefficient obtained show time-histories of pressure with nonlinearity rather than linearity considered ever.

    DOI： 10.2208/proce1989.54.811

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  • ケーソン式防波堤の被災事例に基づくレベル3信頼性設計法の妥当性の検証

    高木泰士

    海洋開発論文集   23   835 - 840   2007.6

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    Language：Japanese  

    DOI： 10.2208/prooe.23.835

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  • ケーソン式防波堤の捨石マウンドに発生する地盤反力と支持力破壊に関する解析的研究

    高木泰士, 竹内邦夫, 柴山知也

    地盤工学研究発表会発表講演集   42nd   977-978   2007.6

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    Language：Japanese  

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  • ケーソン式防波堤の波浪による転倒・回転限界と捨石マウンド挙動に関する実験的研究

    高木泰士, 竹内邦夫, 柴山知也

    地盤工学研究発表会発表講演集   42nd   975-976   2007.6

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    Language：Japanese  

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  • An Optimal Design Method for the Entire Breakwater System Using the Level III Reliability Based Design

    TAKAGI Hiroshi

    PROCEEDINGS OF COASTAL ENGINEERING, JSCE   54   911 - 915   2007

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    Publisher：Japan Society of Civil Engineers  

    The main purpose of the present study is to introduce an optimal procedure to consider the economical as well as stability aspects into the current model of the Level III reliability based design. To achieve this purpose, first the entire breakwater system composed of the upright section and the rubble mound is considered as the target domain, whereas the past studies have mainly focused on the upright section only. Secondly, two new failure modes, bearing capacity and circular slip failure, are incorporated into the previous model to evaluate the failure probabilities within the service lifetime for the entire section of a breakwater. The validity of the procedure proposed was confirmed through trial calculations. It is expected the newly proposed procedure can prevail over current design methods for breakwaters.

    DOI： 10.2208/proce1989.54.911

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  • Violent Wave Impact on Vertical Wall using Pressure-Impulse Theory

    Thao Nguyen Danh, TAKAGI Hiroshi, SHIBAYAMA Tomoya

    PROCEEDINGS OF COASTAL ENGINEERING, JSCE   54   811 - 815   2007

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    Publisher：Japan Society of Civil Engineers  

    Breaking waves on coastal structures produce impulse pressures that are high in magnitude and short in duration, compared with pressures exerted by non-breaking waves. The present study is concerned with a theoretical approach, which is based on the momentum impulse, to simulate the impact pressures on a vertical wall. The theoretical impact pressures are determined using varied velocity before impact process. The velocity field in the vicinity of structure is calculated by LES model including turbulence. The necessary coefficient λ* to evaluate impulse pressures is tentatively obtained through a comparison between the laboratory tests and the numerical results. The computational results using the coefficient obtained show time-histories of pressure with nonlinearity rather than linearity considered ever.

    DOI： 10.2208/proce1989.54.811

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  • ESTIMATION ERROR IN THE ANALYTICAL PREDICTION OF STANDING WAVE PRESSURES ACTING UPON BREAKWATERS

    TAKAGI HIROSHI, NAKAJIMA CHIHIRO

    土木学会論文集 B   63 ( 4 )   291 - 294   2007

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    Language：Japanese   Publisher：Japan Society of Civil Engineers  

    The standing wave pressure is the predominant force in designing deepwater breakwaters. When the design of breakwaters is conducted by means of the reliability based design, some values denoting the reliability of the quantitative estimation of the standing wave pressures will be required in order to obtain a reasonable dimension for the breakwater. In the present study, a comparison between the computed results using the forth order approximation based on the finite amplitude theory and the experimental results is made to obtain those values. Consequently, both the bias of the experimental results with regard to the computational results (=0.91) and the standard deviation (=0.10) are found.

    DOI： 10.2208/jscejb.63.291

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  • 3次元LESモデルによる傾斜式防波堤周辺の乱流特性の数値的検討

    THAO Nguyen Danh, 高木泰士, 柴山知也, 岡安章夫

    海岸工学論文集   53 ( 2 )   751-755 - 755   2006.10

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  • 大水深地点におけるケーソン式防波堤の信頼性設計手法の提案

    高木泰士, 柴山知也

    海岸工学論文集   53 ( 2 )   901-905 - 905   2006.10

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  • 港湾構造物における深層混合処理工法の部分安全係数及び設計法に関する検討(その2)

    北詰昌樹, 長尾毅, 高木泰士, 中西雅時, 徳永幸彦, 小竹望, 北出圭介, 村木高

    地盤工学研究発表会発表講演集   40th   9-10   2005.6

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    Language：Japanese  

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  • 確率的台風モデルを用いた信頼性設計法

    花山格章, 関本恒浩, 鵜飼亮行, 高木泰士, 畑田佳男, 山口正隆

    海岸工学論文集   49 ( 2 )   926-930 - 930   2002.10

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  • Rational Determination of Return Period of Design Wave Height for Caisson Breakwater in Reliability-Based Design Method.

    GODA YOSHIMI, TAKAGI HIROSHI

    海岸工学論文集   46 ( 2 )   921-925 - 925   1999.10

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  • Comparison of Lateral and Longitudinal Artificial Reef

    Goda Yoshimi, Takagi Hiroshi

    PROCEEDINGS OF CIVIL ENGINEERING IN THE OCEAN   13   31 - 36   1997

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    Publisher：Japan Society of Civil Engineers  

    A lateral artificial reef systems is a group of submerged, broad-crested detached breakwaters, which dissipate the incident wave energy by depth-controled breaking over the crests. A longitudinal artificial reef systems is a grope of wave heights and wave braking process through the refraction effect. Numerical of wave heights and wave-induced currents around these reef systems has been proved in good agreement with laboratory data. Performance of two systems in wave and current attenuation is compared using both laboratory data and numerical predictions.

    DOI： 10.2208/prooe.13.31

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  • Comparison of Lateral and Longitudinal Artificial Reef.

    GODA YOSHIMI, TAKAGI HIROSHI

    海洋開発論文集   13   31-36 - 36   1997

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    Language：Japanese   Publisher：Japan Society of Civil Engineers  

    A lateral artificial reef systems is a group of submerged, broad-crested detached breakwaters, which dissipate the incident wave energy by depth-controled breaking over the crests. A longitudinal artificial reef systems is a grope of wave heights and wave braking process through the refraction effect. Numerical of wave heights and wave-induced currents around these reef systems has been proved in good agreement with laboratory data. Performance of two systems in wave and current attenuation is compared using both laboratory data and numerical predictions.

    DOI： 10.2208/prooe.13.31

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Research Projects

  • 国際開発と社会的公正：気候変動時代における沿岸インフラ整備をめぐる援助競争

    Grant number：23K17563  2023.6 - 2026.3

    日本学術振興会  科学研究費助成事業  挑戦的研究(萌芽)

    井内 加奈子, 高木 泰士, 地引 泰人

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    Grant amount：\6240000 （ Direct Cost: \4800000 、 Indirect Cost：\1440000 ）

    本研究は、工学的な技術展開に基づく防災・減災を謳った国際援助において、減災先進国の政府・非政府・民間等の参加主体が有する事業推進の理念や方針、行った判断を調査し、独自技術の輸出競争になっているとも考えられる現状と、事業実施が地域住民の社会経済活動や生活に与えた影響を探索的に把握することを目的とする。国際開発スキームでの減災先進国による沿岸インフラ整備は、洪水に脆弱な地域のニーズに合致しない、一方的な投資になっているのではないかと問うことで、ドナーの論理による援助実態を把握し、地域の社会的公正性が保たれる防災・減災投資のあり方を検討する。
    3年にわたり実施する本研究の第1年目は、研究立ち上げの段階として、日本・オランダの支援アプローチや参加主体を洗い出すための方法について考察し、データ収集・分析のための枠組み検討を開始した。また、インドネシアのジャカルタ湾とフィリピンのマニラ湾での実施中の事業や参加主体についての情報収集を開始した。2024年2月には、遠隔では入手しにくいマニラ湾の開発状況について、Philippine Reclamation Authority(PRA:フィリピン埋立当局）を含むステークホルダーへのヒアリングと現地視察を行い、同じ湾内においても、事業は湾に接する各自治体との連携のもと様々な政治ダイナミックスで実施されており、地域レジリエンスへの影響確認には、詳細な対象地域を絞る必要性があることを明らかにした。さらに、オランダとインドネシアの研究協力者との連携のもと、沿岸管理の思想についての情報交換を開始した。

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  • 若齢マングローブの定着率向上に資するポータブル消波工の研究

    Grant number：23K04343  2023.4 - 2026.3

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    高木 泰士

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    Grant amount：\4680000 （ Direct Cost: \3600000 、 Indirect Cost：\1080000 ）

    本研究では若齢マングローブの定着率を高めて順応的に植林域を拡大していく方策として，人力で設置可能なポータブル消波工を提案し，その要求性能を明らかにするための研究を行っている。植え付け直後のマングローブは根が十分に発達しておらず波による流失リスクが高いため，ポータブル消波工の効果により定着率が高まると期待されるが，これまでにマングローブが生える極浅水域での消波工の消波性能に関する造波実験や数値解析的研究に加えて，現地調査を行い若齢マングローブの成長に及ぼす種々の影響，ポータブル消波工の設計に関する研究を行ってきている。

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  • 被災沿岸地域から学ぶ移転復興計画論の構築：台風ハイアン・スラウェシ島地震を対象に

    Grant number：20H02320  2020.4 - 2024.3

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    井内 加奈子, 高木 泰士, 地引 泰人, 近藤 民代, 楠 綾子

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    Grant amount：\16250000 （ Direct Cost: \12500000 、 Indirect Cost：\3750000 ）

    本研究は、住民移転を伴う復興を進める2013年台風ハイアン被災地（タクロバン市周辺）と2018年スラウェシ島地震の沿岸部（パル市周辺）を対象に、４ヵ年の研究を計画している。タクロバン市とパル市の復興経年には5年の差があるが、この復興経年の違いを活用した研究フローとしている。第1年次にあたる2020年度は、2019年度に終了したタクロバン市対象の移転研究による解析結果を活用し、移転・復興計画論の枠組みで不足する必要な情報を収集し、本研究の枠組みともなる分析・検討を行った。パル市の移転・復興については、予備的調査を行った。
    <BR>
    以下に成果を簡潔に記す。
    復興での減災に尽力したタクロバン市の移転・復興の履歴を検討し、本研究作業のため、復興の時間的な枠組みを、被災時から2年前後は「復興計画策定期間」、被災後2年から4年前後は「復興事業実施期間」、被災後5年前後からそれ以降は「事業実施後の減災空間での生活期間」、との仮説を立てた。また、移転・復興での時間経過と、住民の意識・生活の関係では、「復興計画策定期間」にはハザードの低減、「復興事業実施期間」には各世帯の生活再建、「事業実施後の減災空間での生活期間」には新たな生活への適応が中心課題となっていることも明らかにした。さらに、移転・復興計画と事業実施後の大きな差異を提示する事業・項目について、①防潮堤、②移転先住宅地、③沿岸部の元居住地、があり、これらを詳細に調べることの重要性を明らかにした。なお、タクロバン市の事例からは、移転・復興を統括するガバナンスとして、「設立」「資金」「調整」「政治」「リーダーシップ」「達成」「設立後」の7つの項目が重要であることが分析の結果明らかになった。

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  • Investigation of the effects of long-term power outage due to the 2019 typhoon Faxai

    Grant number：19K24677  2019.10 - 2021.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Special Purposes

    Yoshihisa Maruyama

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    Grant amount：\30810000 （ Direct Cost: \23700000 、 Indirect Cost：\7110000 ）

    A powerful typhoon Faxai, the 15th typhoon in 2019, made landfall in Tokyo’s neighboring Chiba Prefecture around 5:00 a.m. on September 9. It caused severe structural damage especially in the southwestern part of Chiba Prefecture. It also triggered extensive and continued power outage in Chiba Prefecture. Power supply was disrupted at approximately 640 thousand houses in Chiba Prefecture as of 10:30 am on September 9. The power failure continued for about two weeks mainly in the southern part of Chiba Prefecture. In this study, various functional and structural damage caused by this typhoon was investigated. In Japan, it is anticipated that extensive power outages may occur after the Tokyo Inland and the Nankai Trough earthquakes in the near future. This study will be helpful to establish a resilient water supply system against future earthquakes.

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  • Scientific examination of the effectiveness of wood piles as a countermeasure for coastal protection and disaster mitigation

    Grant number：19K04964  2019.4 - 2023.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

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    Grant amount：\4290000 （ Direct Cost: \3300000 、 Indirect Cost：\990000 ）

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  • International cooperative research for coastal disaster mitigation in Asia(Fostering Joint International Research)

    Grant number：16KK0121  2017 - 2019

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Fund for the Promotion of Joint International Research (Fostering Joint International Research)

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    Grant amount：\12220000 （ Direct Cost: \9400000 、 Indirect Cost：\2820000 ）

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  • Risk Analysis of High-Impact, Low-Frequency Typhoon Storm Surges in the Mekong Delta

    Grant number：26702009  2014.4 - 2018.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Young Scientists (A)

    Takagi Hiroshi

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    Grant amount：\7800000 （ Direct Cost: \6000000 、 Indirect Cost：\1800000 ）

    The present study developed the model that inundation levels in the Mekong Delta can be estimated by considering ocean tides, sea-level rise, storm surges, and land subsidence. Our analysis of inundation patterns projects that the duration of inundation at an important road in Can Tho will continue to rise from the current total of 72 inundated days per year to 270 days by 2030 and 365 days by 2050. People in the Mekong Delta have traditionally lived with floods, and thus there is certain resilience among residents in coping with small floods. At present, daily maximum inundation depth, which is generally shallower than 10 cm on the road, seems to be still manageable; however, our analysis indicates that this will start drastically increasing in the coming decades and reach an average depth of 70 cm by 2050. Effective and well-planned actions to mitigate the effects of future potential major typhoons are urgently required.

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