Faculty Profiles - TAKI Kentaro

Papers - TAKI Kentaro

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CONSERVATION STRATEGIES FOR RIPARIAN VEGETATION CONSIDERING RIVER SEGMENT AND VEGETATION CLASSIFICATION–SUCCESSION Reviewed

Toshihiro SUZUKI, Yoichi MORIMOTO, Takayoshi TSUZUKI, Keigo NAKAMURA, Kentaro TAKI

31 1 - 6 2025.6

REVIEW AND IMPLEMENTATION OF NATURE RESTORATION UTILIZING HBITAT POTENTIAL MAP FOR NATIVE AQUATIC PLANTS IN THE KAKITA RIVER, SHIZUOKA PREFECTURE Reviewed

Gaku ITO, Daisuke NAITO, Kentaro TAKI

31 55 - 60 2025.6

THE USEFULNESS OF 2D FLOW ANALYSIS INTEGRATING RIVER CHANNEL AND FLOODPLAIN WHEN UNDERSTANDING THE FLOW CONDITIONS AROUND OPEN LEVEE SYSTEM Reviewed

Daiki BABA, Kentaro TAKI

31 427 - 432 2025.6

EVALUATION OF FLOOD STRAGE FUNCTION OF PADDY FIELDS USING AN UNSTRUCTURED GRID 2D UNSTEADY FLOW MODEL IN THE ASUWA RIVER BASIN Reviewed

Shunji NISHINO, Koki YAMAMURA, Kentaro TAKI

31 463 - 468 2025.6

HABITAT CONSERVATION PLANNING FOR ENDANGERD SPRING-FED FISH SPECIES USING THERMAL IR IMAGEGS AND UNSTEADY 2D FLOW IN THE MIDDLE REACH OF ANALYSIS IN INUKAMI RIVER, SHIGA PREFECTURE Reviewed

Tamaho IZUMINO, Shigafumi KANAO, Kentaro TAKI

31 49 - 54 2025.6

PROPOSAL OF COUPLED ANALYSIS METHOD OF RAINFALL-RUNOFF-INUDATION (RRI) MODEL AND UNSTRUCTUAL GRID 2D UNSTEADY FLOW (UNST-2D) MODEL FOR INTEGRATED FLOOD MANAGEMENT PLANNING Reviewed

Koki YAMAMURA, Shunji NISHINO, Masafumi YAMADA, Takahiro SAYAMA, Kenji KAWAIKE, Kentaro TAKI

31 469 - 474 2025.6

FLOOD RISK ANALYSIS IN SHIGA PREFECTURE USING THE INTEGRATED HYDRAULIC MODEL CONSIDERING WATER LEVEL OF LAKE BIWA Reviewed

Miaya HAYAZAKI, Masafumi YAMADA, Takahiro SAYAMA, Kentaro TAKI

Japanese Journal of JSCE 81 ( 16 ) 24-16012 2025.2

PROPOSAL OF SEARCH METHOD FOR OPTIMAL PLACEMENT OF “PADDY-FIELD-DAM” USING GENETIC ALGORITHM Reviewed

Koki YAMAMURA, Kentaro TAKI

Japanese Journal of JSCE 81 ( 16 ) 24-16046 2025.2

GERMINATION AND SPREAD MECHANIZSM OF “WAKU-WAKU” FEELING THROUGH COLLABORATIVE NATURE RESTRATION Reviewed

Anju Ueda, Akira Wada, Takehiro Shirao, Kentaro Taki

80 ( 26 ) 24-26025 2024.11

Does willingness to pay for the traditional flood control measures kasumitei vary by river section of residential area? Reviewed

Reiya Watanabe, Satoshi Kofuku, Kentaro Taki, Takehito Yoshida

International Journal of Disaster Risk Reduction 108 104528 - 104528 2024.6

PARAMETERIZATION METHOD OF THE RRI MODEL TO BE APPLIED TO RIVER BASIN FLOOD CONTROL STUDIES Reviewed

Osamu FUKUI, Ryosuke NISHIZAWA, Shuji IWAMI, Masafumi YAMADA, Takahiro SAYAMA, Kentaro TAKI

30 531 - 536 2024.6

Factors motivating residents of flood-prone areas to adopt nature-based solutions for flood-risk reduction Reviewed

Keiko Hori, Tomomi Saito, Osamu Saito, Shizuka Hashimoto, Kentaro Taki, Takehito Yoshida, Katsue Fukamachi, Chiho Ochiai

International Journal of Disaster Risk Reduction 97 103962 - 103962 2023.10

Public Participation with Social Organizations in Water Resources Management in China : a case study of the ‘civilian river chiefs’ in Xiangtan City, Hunan Province Reviewed

Chuhui Deng, Naoko Hirayama, Kentaro Taki

JOURNAL OF WATER AND ENVIRONMENTAL ISSUES 36 ( 1 ) 46 - 53 2023.8

FUNCTIONAL EVALUATION OF OPEN LEVEE SYSTEM OF THE TAKATOKI RIVER DURING HEAVY RAIN IN AUGUST 2022 AND EXAMINATION OF CONSERVATION MEASURES Reviewed

Daiki BABA, Shogo TSUKIYAMA, Mitsuhiro TSUJI, Kentaro TAKI

29 413 - 418 2023.6

A STUDY ON LAND CONSERVATION IN THE ERA OF RIVER BASIN FLOOD CONTROL : FOCUSING ON THE EVALUATION METHOD OF FLOOD DRR FUNCTION AND ECOLOGICAL FUNCTION OF “KASUMI” LEVEES SYSTEM Reviewed

Emi SAEKI, Ryota NAKAMURA, Kentaro TAKI

29 431 - 436 2023.6

Elucidation of mosaic patterns in gravel riverbeds using classifying flow velocity regimes obtained from a planar two-dimensional analysis Reviewed International journal

Niwa H., Taki K., Izumino T.

River Research and Applications 2023 1 - 12 2023.2

Language：English Publishing type：Research paper (scientific journal) Publisher：River Research and Applications

Gravel riverbeds in the middle reaches of Japanese rivers are essential habitats for various plants and animals. Disturbance from flooding is necessary for the formation of gravel riverbeds, but human control of rivers, such as dams and channelization, has altered flow and sediment regimes, thereby reducing disturbance. The flooding generates a mosaic pattern characterized by varying frequencies and intensities of disturbance in gravel riverbeds. Understanding the disturbance regimes that form mosaic patterns is important for the conservation of biodiversity in rivers. In this study, we proposed a method to extract mosaic patterns from flow velocity regimes obtained by planar two-dimensional analysis by classifying them with time-series clustering. Based on the distribution of Anaphalis margaritacea var. yedoensis on gravel riverbanks, we compared several past flooding events to identify mosaic patterns that are important for A. margaritacea var. yedoensis. The study site is the Echi River, which flows through Shiga Prefecture in Japan and into Lake Biwa. Using a unmanned aerial vehicle (UAV), orthomosaic images with an average ground resolution of 3.3 mm/pixel were created, and colony polygons of A. margaritacea var. yedoensis were created using image detection and visual correction. Hydraulic analysis was performed using iRIC ver2.3 (Nays2DH ver1.0). Time-series clustering was used to classify the flow velocity regimes for each computed mesh into 30 clusters. The relationship between the clusters of each flooding event and the distribution of A. margaritacea var. yedoensis was evaluated. Mosaic patterns were created by classifying the flow velocity regimes of each computational mesh calculated by planar 2D analysis into clusters using time-series clustering. After analyzing the relationship between each cluster and the area of distribution of A. margaritacea var. yedoensis, the first flooding event was determined to be the mosaic pattern that best explained the distribution of A. margaritacea var. yedoensis. Cluster 1, the “low peak, short duration type,” was considered the growth center of A. margaritacea var. yedoensis. The method used in this study is an innovative approach for obtaining mosaic patterns that quantifies these five elements of the disturbance regime.

DOI： 10.1002/rra.4117

Scopus

Other Link： https://onlinelibrary.wiley.com/doi/abs/10.1002/rra.4117

二次元不定流モデルを用いた水田貯留施設の持つ洪水調整機能の広域評価 Reviewed

早崎水彩, 前川勝人, 佐伯絵美, 瀧健太郎

土木学会論文集B1（水工学） 78 ( 2 ) I‗547 - I_552 2022.11

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：公益社団法人土木学会

本稿では，令和2年7月豪雨で甚大な被害を受けた球磨川において，その中流部（球磨盆地）の左岸流域・氾濫域を対象に，農地を広域的に水田貯留施設とした場合の治水効果を一体型モデルを用いて定量化した．また，氾濫平野エリアと支川扇状地エリアとに分け，水田貯留施設の配置による効果の違いをみた．結果，広域的な水田貯留施設化に伴い，支川群のピーク時間は遅くなる一方で，ピーク前の水位上昇がみられた．支川扇状地エリアの水田貯留施設は本支川合流付近の浸水軽減に寄与するが，氾濫平野エリアの水田貯留施設は周辺の浸水深を増加させ，支川ピークを僅かに上昇させる傾向がみられた．このことから，流域治水計画に水田貯留施設を位置付ける際には，配置による機能の違いを戦略的に考慮すべきである．

Other Link： https://doi.org/10.2208/jscejhe.78.2_I_547

複雑な氾濫形態をもつ谷底平野部における超過洪水時の氾濫現象 Reviewed

原田守啓, 中島大雅, 瀧健太郎

河川技術論文集 28 31 - 36 2022.6

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：公益社団法人土木学会

本研究は，計画規模以下から想定最大規模までの多段階の洪水外力を効果的に想定するための知見を得ること，複雑な氾濫形態を有する谷底平野部における超過洪水時の氾濫現象の特徴を考察すること等を目的とする．霞堤等の不連続堤防や河道に沿った複数の氾濫ブロックを有し，複雑な氾濫形態が想定される木曽川水系長良川の谷底平野区間を対象に，河道―氾濫解析統合モデルを構築し，10年確率～想定最大規模までの洪水波形計50ケースを外力とした氾濫解析を実施した．解析結果を分析した結果，谷底平野に流入する各河川の流量配分により浸水面積に大きいばらつきが生じるのに対し，下流区間へのピークカット効果のばらつきは相対的に少ないことが示された．16の氾濫ブロック別の浸水面積を分析した結果，氾濫水の貯留の量と貯留（氾濫）が生じるタイミングが4パターンに分類でき，複雑な氾濫形態を有する谷底平野区間における氾濫現象が下流に与える影響を分析的に提示できることが示された．

DOI： https://doi.org/10.11532/river.28.0_31

Other Link： https://www.jstage.jst.go.jp/article/river/28/0/28_31/_article/-char/ja/

中小河川における「小さな自然再生」推進に向けたプロセス構成要素の把握と適用 Reviewed

佐藤祐一, 瀧健太郎, 藤岡康弘, 水野敏明

河川技術論文集 28 145 - 150 2022.6

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：公益社団法人土木学会

本研究では，多様な主体の協働により進められる「小さな自然再生」を中小河川で拡大することを目的に，そのプロセス構成要素とステイクホルダーの役割を体的に整理した．これを滋賀県・家棟川流域で進められてきたビワマスの保全再生プロジェクトに適用し，具体的な事例から各段階でのポイントを把握した．また河川管理者が主導する「多自然川づくり」や従来の自然再生と比較することで，小さな自然再生は費用や順応的管理，波及効果の点で優位性があるものの，体制づくりの容易さや大河川への適用に課題があり，それぞれの特徴を活かした展開が求められることを明らかにした．提案した体系は，新たに小さな自然再生を開始する際や，取組の課題を抽出し改善方策を検討する際に活用することが可能である．

DOI： https://doi.org/10.11532/river.28.0_145

Other Link： https://www.jstage.jst.go.jp/article/river/28/0/28_145/_article/-char/ja/

「流域治水×グリーンインフラ」の実現に向けて ―課題の整理― Invited

瀧健太郎

環境技術 51 ( 4 ) 16 - 20 2022.5

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Papers - TAKI Kentaro