論文 - 福井 信気
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Tsunami Visualization Tool Using Numerical Simulation Utilizing 3D City Model 査読あり
Ryutaro Oshida, Kano Sasaki, Takao Ota, Hisao Emoto, Nobuki Fukui
2024 Joint 13th International Conference on Soft Computing and Intelligent Systems and 25th International Symposium on Advanced Intelligent Systems (SCIS&ISIS) 1 - 4 2024年11月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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空隙率が異なる消波ブロック被覆堤の越波および反射特性について
太田 隆夫, 溝田 偉史, 斎藤 龍, 福井 信気, 江本 久雄, 河村 裕之, 平山 隆幸
土木学会論文集 特集号（海岸工学）論文 80 ( 17 ) 24-17182 2024年11月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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津波・洪水による複合ハザードモデルを用いた三河湾における水位上昇特性の評価 査読あり
皆見 怜央, 豊田 将也, 加藤 茂, 福井 信気, 宮下 卓也, 森 信人, 金 洙列
土木学会論文集 特集号（海岸工学）論文 80 ( 17 ) 24-17042 2024年11月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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建物内への水浸入を考慮したサブグリッド高潮浸水モデルの開発 査読あり
福井 信気, 山根 哲平, 太田 隆夫, 江本 久雄
土木学会論文集 特集号（海岸工学）論文 80 ( 17 ) 24-17039 2024年11月
担当区分：筆頭著者, 責任著者 記述言語：日本語 掲載種別：研究論文（学術雑誌）
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Application of a subgrid-scale urban inundation model for a storm surge simulation: Case study of typhoon Haiyan 査読あり
Nobuki Fukui, Nobuhito Mori, Sooyoul Kim, Tomoya Shimura, Takuya Miyashita
Coastal Engineering 104442 - 104442 2023年12月
担当区分：筆頭著者, 責任著者 掲載種別：研究論文（学術雑誌） 出版者・発行元：Elsevier BV
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建物体積の影響を考慮した市街地における津波浸水計算 査読あり
福井信気, 森信人, 宮下卓也, 志村智也
土木学会論文集 79 ( 17 ) 2023年11月
担当区分：筆頭著者, 責任著者 記述言語：日本語 掲載種別：研究論文（学術雑誌）
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Multi-scale Simulation of Subsequent Tsunami Waves in Japan Excited by Air Pressure Waves Due to the 2022 Tonga Volcanic Eruption 査読あり
Takuya Miyashita, Ai Nishino, Tung-Cheng Ho, Tomohiro Yasuda, Nobuhito Mori, Tomoya Shimura, Nobuki Fukui
Pure and Applied Geophysics 2023年08月
掲載種別：研究論文（学術雑誌） 出版者・発行元：Springer Science and Business Media LLC
Abstract
The 2022 Hunga Tonga-Hunga Ha’apai eruption generated tsunamis that propagated across the Pacific Ocean. Along the coast of Japan, nearshore amplification led to amplitudes of nearly 1 m at some locations, with varying peak tsunami occurrence times. The leading tsunami wave can generally be reproduced by Lamb waves, which are a type of air-pressure wave generated by an eruption. However, subsequent tsunamis that occurred several hours after the leading wave tended to be larger for unknown reasons. This study performs multi-scale numerical simulations to investigate subsequent tsunami waves in the vicinity of Japan induced by air pressure waves caused by the eruption. The atmospheric pressure field was created using a dispersion relation of atmospheric gravity wave and tuned by physical parameters based on observational records. The tsunami simulations used the adaptive mesh refinement method, incorporating detailed bathymetry and topography to solve the tsunami at various spatial scales. The simulations effectively reproduced the tsunami waveforms observed at numerous coastal locations, and results indicate that the factors contributing to the maximum tsunami amplitude differ by region. In particular, bay resonance plays a major role in determining the maximum amplitude at many sites along the east coast of Japan. However, large tsunami amplification at some west coast locations was not replicated, probably because it was caused by amplification during oceanic wave propagation rather than meteorological factors. These findings enhance our understanding of meteotsunami complexity and help distinguish tsunami amplification factors.DOI： 10.1007/s00024-023-03332-9
その他リンク： https://link.springer.com/article/10.1007/s00024-023-03332-9/fulltext.html
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平均化個別建物抗力モデルと適合格子細分化法を用いた大都市の効率的な高潮浸水計算の開発 査読あり
福井 信気, 森 信人, 金 洙列, 志村 智也, 宮下 卓也
土木学会論文集 B2 (海岸工学) 78 ( 2 ) I_229 - I_234 2022年11月
担当区分：筆頭著者
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Subgrid-scale modeling of tsunami inundation in coastal urban areas 査読あり
Nobuki Fukui, Nobuhito Mori, Takuya Miyashita, Tomoya Shimura, Katsuichiro Goda
Coastal Engineering 177 104175 - 104175 2022年10月
担当区分：筆頭著者, 責任著者 掲載種別：研究論文（学術雑誌） 出版者・発行元：Elsevier BV
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Estimating Compounding Storm Surge and Sea Level Rise Effects and Bias Correction Impact when Projecting Future Impact on Volcanic Islands in Oceania. Case Study of Viti Levu, Fiji 査読あり
Audrius Sabunas, Nobuhito Mori, Tomoya Shimura, Nobuki Fukui, Takuya Miyashita
FRONTIERS IN BUILT ENVIRONMENT 8 2022年04月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：FRONTIERS MEDIA SA
Oceania comprises many Small Island Developing States (SIDS), the majority of which are founded on volcanic islands. Small islands are generally vulnerable to the effects of climate change. However, a high number of islands and different coastal morphology make it challenging to accurately estimate climate change impact on this region. Nevertheless, quantifying hazards and thus assessing vulnerability is crucial for policymaking and adaptation efforts regarding SIDS. Meanwhile, Viti Levu is the principal island of Fiji. Therefore, climate change projection in Viti Levu helps estimate how volcanic islands in Oceania will be affected under future climate. This study projects the compound impact of storm surge by tropical cyclone (TC) and SLR on Viti Levu under current and future climate conditions. The primary goal of this study is to estimate the impact of extreme 50- and 100-years return storms on coastal areas and populations. This study also assesses the impact of the bias correction of TC intensity for impact assessment. Even though limited to one island, the results could facilitate the application on other volcanic islands, primarily in Melanesia. Even though Viti Levu is a high island, tropical cyclones can sustain extensive economic damage and result in high numbers of the temporarily displaced population in some low-lying coastal locations. The results show that bias can be significant when comparing observed and estimated datasets, particularly for less intense and future extreme events.
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Uncertainty of storm surge forecast using integrated atmospheric and storm surge model: a case study on Typhoon Haishen 2020 査読あり
Masaya Toyoda, Nobuki Fukui, Takuya Miyashita, Tomoya Shimura, Nobuhito Mori
Coastal Engineering Journal 64 ( 1 ) 135 - 150 2022年01月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Informa UK Limited
Hindcast experiments and pseudo-forecast experiments considering Typhoon Haishen (2020) were conducted using an atmospheric (WRF)-storm surge (GeoClaw) coupled model and a storm surge model with a parametric typhoon model. A series of simulations of the coupled model were used to quantify the error sources of the typhoon track and intensity in the forecast errors of storm surges. The results revealed that the typhoon track forecast had a larger error source for the storm surge forecast for the maximum surge height than the typhoon intensity. Furthermore, the parametric Holland typhoon model used in practice has an overestimation trend compared to the coupled model, and the parametric Holland typhoon model using WRF output was able to forecast the storm surge height near the typhoon (western Kyushu area) and its peak occurrence time accurately. However, the forecast accuracy tended to decrease as the distance from the typhoon to the target location increased. The pseudo-ensemble simulation of the storm surge forecast using forecast error information was conducted considering the uncertainty of the typhoon track forecast. The 20 ensemble forecast simulations revealed that the perturbed typhoon track simulation can increase the possibility of capturing the peak time of the storm surge.
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Impact Assessment of Storm Surge and Climate Change-Enhanced Sea Level Rise on Atoll Nations: A Case Study of the Tarawa Atoll, Kiribati 査読あり
Audrius Sabūnas, Takuya Miyashita, Nobuki Fukui, Tomoya Shimura, Nobuhito Mori
Frontiers in Built Environment 7 2021年11月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Frontiers Media SA
The Pacific region consists of numerous Small Island Developing States (SIDS), one of the most vulnerable to flooding caused by compound effects of sea level rise (SLR) and storms. Nevertheless, individual studies regarding the impact assessment for SIDS, such as the low-lying Kiribati, remain scarce. This study assessed the impact of climate change-induced storm surge and SLR compounding effects on Tarawa, the most populous atoll of Kiribati, the largest coral atoll nation. It projected the impact using a combined dynamic surge and SLR model based on the IPCC AR5 RCP scenarios and 1/100 and 1/50 years return period storm events. This approach allows estimating the inundation scope and the consecutive exposed population by the end of the 21st century. The results of this study show that the pace of SLR is pivotal for Tarawa, as the sea level rise alone can claim more than 50% of the territory and pose a threat to over 60% of the population under the most intense greenhouse gas emissions scenario. Furthermore, most coasts on the lagoon side are particularly vulnerable. In contrast, the contribution of extreme events is generally minimal due to low wind speeds and the absence of tropical cyclones (TC). Despite this, it is clear the compound effects are critical and may inescapably bring drastic changes to the atoll nations by the end of this century. The impact assessment in this study draws attention to the social impact of climate change on SIDS, most notably atoll islands, and evaluates their adaptation potential.
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Variations in Building-Resolving Simulations of Tsunami Inundation in a Coastal Urban Area 査読あり
Nobuki Fukui, Yu Chida, Zhongduo Zhang, Tomohiro Yasuda, Tung-Cheng Ho, Andrew Kennedy, Nobuhito Mori
Journal of Waterway, Port, Coastal, and Ocean Engineering 148 ( 1 ) 2021年11月
担当区分：筆頭著者 記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：American Society of Civil Engineers (ASCE)
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実地形を対象とした流体場の時空間計算精度と漂流物の計算条件の違いが漂流物の計算精度に与える影響に関する検討 査読あり
千田 優, 福井 信気, 森 信人, 安田 誠宏
土木学会論文集 B2 (海岸工学) 77 ( 2 ) I_331 - I_336 2021年11月
記述言語：日本語
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都市地形を対象とした津波浸水時の陸域の流速場の比較検討 査読あり
福井 信気, 森 信人, 千田 優, 安田 誠宏
土木学会論文集 B2 (海岸工学) 77 ( 2 ) I_211 - I_216 2021年11月
担当区分：筆頭著者 記述言語：日本語
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Assessing Social Impact of Storm Surge and Sea Level Rise Compound Effects in Viti Levu, Fiji, Comparing With The Historical TC Records 査読あり
Audrius SABŪNAS, Nobuhito MORI, Nobuki FUKUI, Tomoya SHIMURA, Takuya MIYASHITA, Adrean WEBB
土木学会論文集 B2 (海岸工学) 77 ( 2 ) I_943 - I_948 2021年11月
記述言語：英語
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Impact Assessment of Climate Change on Storm Surge and Sea Level Rise Around Viti Levu, Fiji 査読あり
Audrius Sabūnas, Nobuhito Mori, Nobuki Fukui, Takuya Miyashita, Tomoya Shimura
Frontiers in Climate 2 2020年11月
掲載種別：研究論文（学術雑誌） 出版者・発行元：Frontiers Media SA
Projecting the sea level rise (SLR), storm surges, and related inundation in the Pacific Islands due to climate change is important for assessing the impact of climate change on coastal regions as well as the adaptation of the coastal regions. The compounding effects of storm surges and SLR are one of the major causes of flooding and extreme events; however, a quantitative impact assessment that considers the topographical features of the island has not been properly conducted.
Therefore, this study projects the impact of storm surge and SLR due to climate change on Viti Levu, which is the biggest and most populous island in Fiji. The impact of SLR on the inundation in coastal areas was simulated using a dynamic model based on the IPCC SROCC scenarios and the 1/100 years return period storm surge implemented based on the RCP8.5 equivalent scenario. The affected inundation area and population due to storm surges and SLRs are discussed based on the compound effects of SLR and storm surge.
Although the contribution of SLR to the inundation area was quite significant, the 1/100 year storm surge increased by 10 to 50% of the inundation area. In addition, a narrow and shallow bay with a flat land area had the largest impact of storm surge inundation. Furthermore, the western wind direction had the most severe storm surge inundation and related population exposure due to the topographic and bathymetric characteristics of Viti Levu Island. -
沿岸市街地模型を用いた津波・高潮浸水実験と解析 査読あり
福井信気, 森 信人, Che-Wei Chang, 千田 優, 安田誠宏, 山本剛士
土木学会論文集 B2 (海岸工学) 76 ( 2 ) I_373 - I_378 2020年11月
担当区分：筆頭著者 記述言語：日本語
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気候変動を考慮した我が国の三大湾の高潮最大潮位偏差についての研究レビュー 査読あり
森信人, 福井信気, 志村智也
土木学会論文集 B2 (海岸工学) 76 ( 1 ) 1 - 6 2020年01月
記述言語：日本語
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漂流物と流れ場の時空間計測データを用いた複雑流れ場における津波漂流物挙動の解析 査読あり
千田 優, 福井信気, 森 信人, 安田誠宏, 山本剛士
土木学会論文集 B2 (海岸工学) 76 ( 2 ) I_313 - I_318 2020年
担当区分：筆頭著者 記述言語：日本語
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