UTSUGAWA Takako
| Faculty Division of Humanities and Social Sciences Research Group of History,Sociology and Geography | Associate Professor |
Last Updated :2026/06/29
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Profile Information
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https://researchmap.jp/takako_utsugawa/avatar.JPGName (Japanese)
UTSUGAWAName (Kana)
Takako
Research Areas
Research History
- Apr. 2026 - Present, Nara University, 非常勤講師
- Apr. 2025 - Present, Nara Women's University, Faculty of Letters Department of Studies for History,Sociology and Geography, 准教授
- Apr. 2024 - Mar. 2025, Komazawa University, 非常勤講師, 「自然地理学概説」担当
- Apr. 2022 - Mar. 2025, Hosei University, Faculty of Letters Department of Geography, 助教
- Apr. 2019 - Mar. 2025, Tokyo Keizai University, 非常勤講師, 「自然地理学a・b」担当
- Apr. 2017 - Sep. 2023, Tokyo Denki University, 非常勤講師, 「地学実験」（分担）担当
- Apr. 2021 - Mar. 2022, The University of Electro-Communications, 非常勤講師, 「地学実験」「地学」(分担) 担当
- Apr. 2021 - Mar. 2022, 東京都立大学, 非常勤講師, 「地球環境科学概説I」「地理環境科学実習I」担当
- Apr. 2018 - Mar. 2022, Rissho University, Faculty of Geo-Environmental Science, Department of Geography, 助教
- Sep. 2020 - Mar. 2021, University of the Sacred Heart, 非常勤講師, 「自然地理学１」担当
- Apr. 2017 - Mar. 2018, Tokyo Metropolitan University, 非常勤講師, 「情報リテラシー実践I」「情報リテラシー実践IIA（統計・データベース）」担当
- Apr. 2017 - Mar. 2018, Tokyo Metropolitan University, 地理学教室, 特任研究員
Education
Teaching Experience
- River Geomorphology, Nara University, Apr. 2026 - Present
- physical geography B, Nara Women's University, Apr. 2026 - Present
- Basic physical geography, Nara Women's University, Oct. 2025 - Present
- River Geomorphology, Nara Women's University, Apr. 2025 - Present
- Geology, Hosei University, Sep. 2023 - Mar. 2025
- Cartography II, Hosei University, Sep. 2022 - Mar. 2025
- 自然環境論, Hosei University, Apr. 2022 - Mar. 2025
- Apr. 2019 - Mar. 2025
- Apr. 2017 - Sep. 2023
- Apr. 2020 - Mar. 2022
- Apr. 2018 - Mar. 2022
- Apr. 2018 - Mar. 2022
- Feb. 2022
- Sep. 2021
- Sep. 2020 - Mar. 2021
- Oct. 2017 - Feb. 2018
- Apr. 2017 - Jul. 2017
Professional Memberships
■Ⅱ．研究活動実績
Published Papers
- Not Refereed, Mar. 2026, 34, 9, 21, Research institution
- Not Refereed, Mar. 2026, 61, 13, 22, Research institution
- Refereed, Mar. 2022, 61, 106, 15, 28
- Geographical reports of Tokyo Metropolitan University, Disturbance and consequent changes of riverbed environments by typhoon HAGIBIS flood in 2019 at the middle reaches of the TAMA river, central JAPAN, 2022, 57, 39, 46, Research institution
- Refereed, Journal of the Sedimentological Society of Japan, The Sedimentological Society of Japan, Distribution of gravel-sand on high water bed by Typhoon Hagibis (T1919) flood in the middle reaches of the Tama River, central Japan, Shirai Masaaki; Utsugawa Takako, Distribution of clastic grains transported and deposited on high water bed during Typhoon Hagibis (T1919) flood in the middle reaches of the Tama River was investigated. Gravel deposition tends to be predominant from upstream part to river channel side of central part of banks. On the other hand, middle-fine grained sand deposition tends to be predominant from far side from river channel of central part to downstream part of banks. The sands often make low-relief 2D dune bedform. The gravels were often deposited on a trough which has been fixed on a bank during several decades. Average rate of the gravel movement during T1919 flood on a trough was estimated as being less than several 10 m/hour. Even though the T1919 flood, one of the biggest flood during several decades in Japan, transported and arranged various sized grains (boulder-sand) on sand-gravel bank conspicuously, hardly changed the form of the banks. Considering devastating flood caused by the rainfall beyond an expected level might increase in future, it is important to record and publish the situation of transport and sedimentation of the clastic grains by T1919 flood at various place in the Japanese islands., 2022, 80, 1・2, 11, 25, 10.4096/jssj.80.11
- Refereed, Mar. 2021, 23, 23, 105, 114, Research institution
- Not Refereed, Mar. 2020, 55, 13, 21
- Refereed, The Quaternary Research (Daiyonki-Kenkyu), Japan Association for Quaternary Research, Influence of mega debris flow on geomorphological features of the upper reaches in the Abe River examined from the formation process of the Akamizu waterfall, Shirai Masaaki; Utsugawa Takako; Watanabe Mayo,
The valley in the upper reaches of the Abe River, Shizuoka Prefecture, was filled with an "Oya-Kuzure" slope failure deposit from the early 18th century Hoei Earthquake. The Akamizu Fall, which has maximum river-bed gradient in the distribution area of the slope failure deposit, is located on 0.4km downstream from the confluence of the Oya River originating from the "Oya-Kuzure" on the Abe River mainstream. Distribution of slope failure deposit (mainly debris flow deposit) and paleocurrent estimated from imbrication of gravels in the debris flow deposit around the Akamizu Fall showed that the waterfall was formed by a shortcut of the incised meander valley across a shale ridge due to deposition of slope failure deposit filling the valley. Similarly, constrained gorges located in the distribution area of slope failure deposit were formed by filling an old valley with slope failure deposit and subsequent downward erosion of basement rock (Neogene shale) slope. Sedimentological features of the slope failure deposit and the relationship of depositional surfaces of the deposit imply that transportation mode of the slope failure deposit might have transformed from debris flow to hyperconcentrated flow 0.5km downstream of the Akamizu Fall.
, 2020, 59, 1, 17, 29, 10.4116/jaqua.59.17 - Refereed, Journal of the Sedimentological Society of Japan, The Sedimentological Society of Japan, Characteristics of breaking and abrasion mechanisms acting on fluvial sediments during production and transport processes : relationships between rock type, grain size, and roundness of gravel and sand, Utsugawa Takako; Shirai Masaaki, Breaking and abrasion mechanisms act on the sands and gravels transported in riverine environments as pristine finer grains are produced. To elucidate the characteristics of these grain-producing mechanisms, the relationships between rock type, grain size, and roundness of detritus were examined. The downstream changes in roundness of both sand and gravel fractions (0.5-128 mm in diameter) were investigated at two tributaries of the Watarase River, central Japan, under similar fluvial and geological conditions. The tendency that grain roundness and ratio of chert and shale (ch/sh) became lower as the grain size became finer indicates that pristine angular grains produced from broken and/or abraded coarser grains increased in the finer grain size fraction. At downstream sites, where more transported grains were deposited, the authors identified the phenomenon that the roundness values were highly similar within certain consecutive grain size fractions; i.e., “roundness in saturation.” This indicates an increase in angular grains produced from transported coarser grains and an increase in abraded and rounded grains become in attainment of equilibrium during transport. The onset of roundness value saturation, i.e., no additional increase of grain roundness during the transport process, would differ according to rock type. In this study, the roundness value of chert and shale was 0.4 (sub-angular) and 0.6 (sub-rounded), respectively. These values would be unique to rivers in the Japanese islands characterized by short river lengths and steep gradients., 2019, 78, 1, 15, 31, 10.4096/jssj.78.15
- Role of breaking and abrasion mechanisms during fluvial grain producing–transport processes revealed from roundness changes and lithological characteristics of gravel–sand grains, UTSUGAWA Takako, Mar. 2017, 1, 184, Doctoral thesis
- Refereed, Environmental Earth Sciences, Influence of deposition in dam reservoir on the deep marine hemipelagic environment off Niigata, central Japan, Masaaki Shirai; Takako Utsugawa; Akiko Omura; Ryo Hayashizaki; Katsura Kameo; Yuichi Niwa; Hitoshi Shimizu, Feb. 2017, 76, 3, Scientific journal, 10.1007/s12665-017-6430-2
- Refereed, Geographical review of Japan series A, The Association of Japanese Geographers, A Review of Roundness, a Fundamental Shape Parameter of Detrital Particles: History of Analysis and Analytic Prospects, Takako UTSUGAWA; Masaaki SHIRAI,
Studies on the external geometry of detrital particles are subject to controversy. This paper reviews the history of detrital grain shape analysis, particularly "roundness", since the first half of the 20th century and within various fields, e.g., physical geography, civil engineering, and mathematics. The authors suggest a flow chart supporting stable evaluation of grain roundness with the Krumbein roundness chart, which is suitable for prompt semi-quantitative measurement of roundness and has been commonly used. Additionally, the authors redefine surface texture, a smaller-scale shape feature, because the boundary between roundness and surface texture is ambiguous in current studies with high-resolution image analysis. The methodological transition from analogue to digital measurement, i.e., image analysis, is in progress, and two- or three-dimensional quantitative image analysis is the preferred measurement approach. It is necessary to discuss further appropriate evaluation of grain shape corresponding to image analysis.
, Nov. 2016, 89, 6, 329, 346, 10.4157/grj.89.329 - Not Refereed, Geographical Reports of Tokyo Metropolitan University, Department of Geography, Tokyo Metropolitan University, Sand grain producing-transport processes estimated from gravel-sand grain roundness on dams-constructed Tenryu River, central Japan, Utsugawa Takako; Shirai Masaaki, Mar. 2016, 51, 51, 101, 108, Research institution
- Mar. 2014, 1, 117, Master thesis
- Not Refereed, Geographical reports of Tokyo Metropolitan University, Department of Geography, Tokyo Metropolitan University, A STUDY OF THE FORMATION PROCESS OF THE NOSHIRO COASTAL DUNE, AKITA PREFECTURE, NORTHEASTERN JAPAN, UTSUGAWA Takako; SHIRAI Masaaki, Mar. 2013, 48, 1, 12, Research institution
MISC
- Not Refereed, Mar. 2026, 17, 4, 5, Others
- Proceedings of the General Meeting of the Association of Japanese Geographers, The Association of Japanese Geographers, Changes in coastal landscape at Anse-Vata Beach, New Caledonia: The importance of coastal conservation from a geographical perspective, UTSUGAWA Takako, 2025, 2025a, 191, 10.14866/ajg.2025a.0_191
- Distribution and sedimentological characteristics of boulders on refreshed gravel bar by Typhoon 1919 in the middle of the Tama River, central Japan, UTSUGAWA Takako; SHIRAI Masaaki, After the flooding caused by Typhoon Hagibis （T1919）, a lot of boulders have deposited on the refreshed gravely bars in the middle reaches of the Tama River. Because the most coarse grains usually might deposit on the bottom of river channel which are hard to observe, investigation of them is important to understand the longitudinal and transverse riverine geomorphology as well as the characteristics of sediment which have transported before the condition under control of the water and detritus supply. On March to May in 2020, the authors have investigated the sedimentological characteristics of the boulders distributed on the gravel bars at three sites; Ome, Hamura and Tachikawa, in the middle reaches of the Tama River. We have measured the three axes; long, intermediate and short axes, and have investigated the lithology, the roundness and the broken condition of the boulders more than 25 cm in long axis, distributed around the parallel lines set along the flow direction. Sandstone, chert, diorite, shale, conglomerate, tuff, alternation of sandstone and shale, and limestone boulders were observed. Distinct decrease in grain size from the highest site （Ome） to the lowest site （Tachikawa） in the 15 km was not recognized. The ratio of broken gravels and the roundness of gravels reflect the intensity of water flow and gravel transportation in riverine environment. Based on these indices of sandstone and chert boulders, breaking and abrasion processes, and gravel supply from tributaries were inferred., 30 Sep. 2024, 89, 25, 40, 10.15002/00031127
- Not Refereed, 2024, 89, 45, Introduction commerce magazine
- Proceedings of the General Meeting of the Association of Japanese Geographers, The Association of Japanese Geographers, Sedimentary environment of the last interglacial marine terrace deposits in southern Joban coastal region, UTSUGAWA Takako, 2023, 2023s, 258, 10.14866/ajg.2023s.0_258
- Not Refereed, Geographical review of Japan series A, The Association of Japanese Geographers, The Sedimentological Society of Japan (supervisor), Ito, M. ed.: Field Manual: The World of Sedimentary Structures, Utsugawa Takako, 01 Nov. 2022, 95, 6, 377, 378, 10.4157/grj.95.377
- 日本地球惑星科学連合大会予稿集(Web), Coastal transport process of pebble along the Seisho Coast, Kanagawa Prefecture, estimated from changes in lithological composition and form of pebble particles, 白井正明; 秋山朋美; 河尻清和; 宇津川喬子; 高橋尚志, 2021, 2021
- Proceedings of the General Meeting of the Association of Japanese Geographers, The Association of Japanese Geographers, Roundness in saturation: the relationship with production process of gravel and sand, UTSUGAWA Takako, The concept of "roundness in saturation," i.e., the roundness of no more rounding of detrital grain during transport process had been discussed during the mid-last half of the 20th century. The author reviews the history of "roundness in saturation" had been investigated in the field and in the abrasion experiments, and discusses the phenomenon focusing on the mechanism of grain production, especially abrasion, based on the changes in roundness of grain and sand obtrained from the upper reaches of rivers., 2021, 2021s, 188, 10.14866/ajg.2021s.0_188
- Not Refereed, Journal of the Sedimentological Society of Japan, The Sedimentological Society of Japan, Raised atoll and lagoon of Ouvéa Island, New Caledonia, Utsugawa Takako, 13 Nov. 2020, 79, 1, 2, 2, 10.4096/jssj.79.2
- Not Refereed, REGIONAL STUDIES, An Academic Excursion in New Caledonia, UTSUGAWA, Takako; MAYUSUMI, Daiki; SHIMAZU, Hiroshi, Mar. 2020, 60, 2, 38, 43
- Not Refereed, Proceedings of the General Meeting of the Association of Japanese Geographers, The Association of Japanese Geographers, Agricultural land use and inundation risk in the river side land of the Natori River, Miyagi Prefecture, Yokoyama Takafumi; Hara Masaya; Utsugawa Takako; Ito Tetsuya; Shimazu Hiroshi, 2020, 2020s, 267, 10.14866/ajg.2020s.0_267
- 日本地球惑星科学連合大会予稿集(Web), Characteristics of the Fuji-Sagamigawa Lahar deposit at the upper reaches of Sagami River, central Japan, 白井正明; 小林淳; 宇津川喬子; 河尻清和; 高橋尚志, 2020, 2020
- 日本第四紀学会講演要旨集, Distribution of the Saruhashi lava and change in river-channel course around boundary of the Tsuru and Otsuki cities, 白井正明; 高橋尚志; 宇津川喬子; 河尻清和, 2020, 50 (CD-ROM)
- Not Refereed, REGIONAL STUDIES, Topographical and Historical Excursion in Quebec City, Canada, UTSUGAWA, Takako, Mar. 2019, 59, 103, 12, 18
- Proceedings of the General Meeting of the Association of Japanese Geographers, The Association of Japanese Geographers, Volcanic hazard assessment for extremely huge and low frequent VEI 7 eruptions in Japan, UTSUGAWA Takako; SUZUKI Takehiko, 2018, 2018s, 000171, 10.14866/ajg.2018s.0_000171
- Not Refereed, Journal of the Sedimentological Society of Japan, The Sedimentological Society of Japan, A report on the field trip of the 2018 annual meeting of the Sedimentological Society of Japan, Utsugawa Takako, 2018, 77, 1, 45, 49, 10.4096/jssj.77.45
- Not Refereed, Mar. 2017, 25, 60, 73, Introduction other
- Proceedings of the General Meeting of the Association of Japanese Geographers, The Association of Japanese Geographers, Breaking and abrasion mechanisms revealed from lithological and roundness changes of gravel–sand grains in the Watarase River watershed, central Japan, Utsugawa Takako; Shirai Masaaki, 2016, 2016s, 100232, 10.14866/ajg.2016s.0_100232
- 2015, 2015
- Not Refereed, Journal of the Sedimentological Society of Japan, The Sedimentological Society of Japan, A report on the field trip of the 2014 annual meeting of the Sedimentological Society of Japan, Utsugawa Takako, 2014, 73, 1, 73, 76, 10.4096/jssj.73.73
Presentations
- Oral presentation, Mar. 2026
- Invited oral presentation, Feb. 2026
- Reevaluation of grain shape index: a case study of pebble provenance in the marine terraces., Poster presentation, Jan. 2026
- Oral presentation, Sep. 2025
- Oral presentation, May 2025
- Oral presentation, Apr. 2025
- Poster presentation, Apr. 2025
- Aug. 2024
- May 2024
- Apr. 2024
- Apr. 2024
- May 2023
- Apr. 2023
- Aug. 2022
- Sedimentological record of alternate bar in embanked river: case study of the lower reaches of Natori River, northeastern Japan, Aug. 2022
- May 2022
- A type of gravelly hyperconcentrated flow deposit distributed in the upper reaches of the Abe River, central Japan, May 2022
- Nov. 2021
- Oct. 2021
- Changes of the coastal line on New Caledonia islands, South Pacific Ocean, estimated from the landscape and aerial photos, Oct. 2021
- Aug. 2021
- Jul. 2021
- Jun. 2021
- May 2021
- Mar. 2021
- Dec. 2020
- Nov. 2020
- Nov. 2020
- Jul. 2020
- Jul. 2020
- Jul. 2020
- Yokoyama Takafumi; Hara Masaya; Utsugawa Takako; Ito Tetsuya; Shimazu Hiroshi, Proceedings of the General Meeting of the Association of Japanese Geographers, Agricultural land use and inundation risk in the river side land of the Natori River, Miyagi Prefecture, 2020, 2020 - 2020, The Association of Japanese Geographers
- Jul. 2019, True
- Jun. 2019, False
- May 2019
- May 2019
- May 2019
- Apr. 2019, False
- 24 Aug. 2018, False
- 13 Aug. 2018, True
- 13 Aug. 2018, True
- 02 Jun. 2018, False
- 23 May 2018, False
- 23 May 2018, False
- 27 Mar. 2018
- 26 Mar. 2018
- 23 Mar. 2018
- Grain abrasion of gravel−sand in fluvial−beach systems: the case study of Tenryu River to Enshu Coast, central Japan, 24 May 2017
- 26 Mar. 2017, False
- 白井正明; 宇津川喬子; 大村亜希子; 林崎涼; 加藤裕真; 芦寿一郎, 日本堆積学会大会プログラム・講演要旨, 遠州沖半遠洋性堆積物コア試料で確認された20世紀半ばにおける堆積速度の低下, 10 Mar. 2017, 10 Mar. 2017 - 10 Mar. 2017
- Utsugawa, T; Shirai, M, Fluvial breaking and abrasion mechanisms acting upon gravel–sand grains utilizing the difference of grain lithology, May 2016, False
- Utsugawa, T; Shirai, M, Breaking and abrasion mechanisms revealed from lithological and roundness changes of gravel–sand grains in the Watarase River watershed, central Japan, Mar. 2016, False
- 01 Aug. 2015, True
- 01 Aug. 2015, True
- May 2015, False
- Utsugawa, T; Shirai, M, Sand grain producing and transport processes in downstream reaches of the dams-constructed Tenryu River, central Japan, May 2015, False
- Apr. 2015, False
- Utsugawa, T; Shirai, M, Fluvial sand grain producing–transportation processes estimated by changes in lithology and form of gravel to medium-sand grain in the tributary of Watarase River, Apr. 2015, False
- Mar. 2015, False
- Sep. 2014, False
- Aug. 2014, True
- Aug. 2014, True
- May 2014, False
- Utsugawa, T; Shirai, M, Causes of gravel-sand distribution in upstream part of the river revealed from changes in lithology and form of detritus, May 2014, False
- Mar. 2014, False
- Mar. 2014, False
- Utsugawa, T; Shirai, M, Fluvial sand grain producing process revealed from lithology and roundness change of gravel and sand: A case study of the tributaries of Watarase River, Mar. 2014, False
- 白井正明; 大村亜希子; 林崎涼; 宇津川喬子; 丹羽雄一, 日本堆積学会大会プログラム・講演要旨, 日本海信濃川・阿賀野川沖堆積物表層コアに見られる,20世紀後半の堆積速度変化, 2014, 2014 - 2014
- Oct. 2013, False
- 丹羽雄一; 白井正明; 大村亜希子; 宇津川喬子; 渡辺万葉; 林崎涼, 日本第四紀学会講演要旨集, 安定した塩分環境における混濁水の電気伝導度と孔隙率の関係―熊野灘沖半遠洋性堆積物と天竜川佐久間ダム湖底堆積物の例―, 22 Aug. 2013, 22 Aug. 2013 - 22 Aug. 2013
- Aug. 2013, True
- Utsugawa, T; Shirai, M, Formation process of the Noshiro coastal dune, northeastern Japan: insight from internal structure and its distribution, May 2013, False
- May 2012, False
Awards
Research Projects
- 基盤研究(C), 01 Apr. 2024 - 31 Mar. 2028, 24K07158, 構成物質の再移動・再堆積過程に着目したラハール堆積物の流下過程の研究, 白井 正明; 宇津川 喬子, 日本学術振興会, 科学研究費助成事業, 東京都立大学, 4680000, 3600000, 1080000, kaken
- 若手研究, Apr. 2023 - Mar. 2026, 23K12325, ニューカレドニアの事例から捉える海岸侵食の実態：砂浜の形成過程からの考察, 宇津川 喬子, 日本学術振興会, 科学研究費助成事業, 法政大学, 4680000, 3600000, 1080000, kaken
- Grant-in-Aid for Scientific Research (C), Apr. 2018 - Mar. 2023, 18K01128, Coinvestigator, Geographical study on Prompt land use changes on riverside land from the viewpoint of dynamics of physical and social environment along the middle Arakawa river, Saitama, Japan, 島津 弘; 鈴木 重雄; 宇津川 喬子; 伊藤 徹哉; 横山 貴史; 原 将也; 原 美登里, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), Rissho University, 4420000, 3400000, 1020000, 埼玉県の荒川および宮城県の名取川において堤外地の空中写真の判読および現地における観察と聞き取り調査，現地における文献・資料収集を実施し，自然・生態と災害リスク，堤外地をめぐる社会と政治，堤外地の文化と生業の概要を把握した．自然分野に関しては微地形分布，社会分野に関しては土地利用変遷，土地所有形態，不法占有，かつて存在した堤外地集落の現状，生業分野に関しては現在の農業的土地利用についての概要を把握した．
堤外地は築堤以前から存在する集落や土地利用の影響があるものの，自然の状態に近い微地形が存在している．土地所有や地割は流路跡などの微地形の影響を受け，矩形ではなく，1つの地形単位が分割されるような形態を示している．土地利用としては過去から大部分が畑地として利用されているが，比較的最近まで集落が存在していた場所の周囲では現在でも水田が分布し，稲作が行われている．一方で，名取川堤外地においては，畑地利用はされているものの，元の所有者以外に貸し出され，あるいは家庭菜園のように利用され，一部においては元所有者が不明になっているような場所も見られた．さらに，元々の所有者が自所有地に加え，国所有の官地を借り入れて農業を行っている事例も見られた．
名取川では，特に河口に近いほど耕作の行われていない土地が広がり，東北地方太平洋沖地震の津波遡上による土地荒廃，あるいは所有者死亡，移転にともなっての耕作を行わなくなった土地が広がっていることが観察された．より上流側においては，かつて不耕作地が広がっていたのを確認していたが，ほぼ全面的に耕作が再開されていることも確認できた．, kaken - Apr. 2022 - Feb. 2023, Principal investigator, チャート砂礫の供給源推定を軸にした常磐地域における最終間氷期以降の古地理の復元, 公益財団法人藤原ナチュラルヒストリー振興財団, 2021年度（第30回）学術研究助成［地学分野］, rm:presentations
- Grant-in-Aid for Scientific Research (C), 01 Apr. 2018 - 31 Mar. 2022, 18K03762, Coinvestigator, Understanding of mega debris flow disasters around mounatainous area of central Japan based on sedimentological investigation, Shirai Masaaki, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), Tokyo Metropolitan University, 4420000, 3400000, 1020000, The sedimentological characteristics of hyperconcentrated flow (HCF) deposits formed by a slope failure event in the upper reaches of the Abe River, central Japan, were investigated. The lower major unit, composed of alternating pebble and cobble layers were interpreted as traction carpet deposits accumulating rapidly during a hyperconcentrated flow event based on the lithofacies, clast orientation, and matrix grain size distribution. Based on the extremely high mud content within the matrix of the middle unit, consisting of poorly sorted structureless muddy pebble gravel with cobble-boulder, this unit was interpreted as a suspension fallout deposit created during the waning phase of the hyperconcentrated flow event. Most of the cobble-boulder included in the middle unit likely consists of entrained basement blocks from the valley wall. The upper unit was interpreted as a debris flow deposit from which HCF was generated according to the dilution by water., kaken
- Apr. 2015 - Feb. 2016, Principal investigator, 砂礫の岩質と形状変化に注目した砂の生成過程の解明―多様な岩種（硬さ）の礫を有する利根川水系において―, 宇津川喬子, 日本科学協会, 平成27年度笹川科学研究助成 複合系, 0, 0, 0, Competitive research funding, rm:published_papers
- Principal investigator, Effects of rock type and grain size on changes in roundness of gravel and sand grains during fluvial transport process, Takako UTSUGAWA, 日本科学協会, 2018年度海外発表促進助成 複合系, 0, 0, 0, 集会名：the 20th International Sedimentological Congress（第20回国際堆積学会議）
出席期間：2018年8月, Competitive research funding
■Ⅲ．社会連携活動実績
１．公的団体の委員等（審議会、国家試験委員、他大学評価委員，科研費審査委員等）
- 中央教育審議会専門委員（社会・地理歴史・公民WG委員）, Aug. 2025 - Present
- 日本地理学会, 資格専門委員会, Apr. 2022 - Present, Society
- 日本堆積学会, 国際交流委員, Oct. 2020 - Present
- 日本堆積学会, 行事委員, Jan. 2020 - Present
- International Association of Sedimentologists（国際堆積学会）, National Correspondent, Sep. 2018 - Jan. 2026, Society
- 法政大学地理学会, 編集委員, 2023 - Mar. 2025
- 羽村市史編さん委員会 第４部会 部会員, Apr. 2017 - Mar. 2024, Autonomy
- 日本堆積学会, 日本堆積学会20周年記念行事実行委員, Oct. 2021 - Mar. 2023
- 立正地理学会, 庶務会計委員・編集委員, May 2018 - Mar. 2022
- 羽村市史編さん委員会 第４部会 主任研究員, Dec. 2014 - Mar. 2017, Autonomy
