Updated on 2026/03/07

写真a

 
SASAKI NATSUKI
 
Organization
Undergraduate School School of Arts and Letters Senior Assistant Professor
Title
Senior Assistant Professor
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Degree

  • 博士（環境学） ( 東京大学 )

  • 修士（環境学） ( 東京大学 )

Research Areas

  • Natural sciences / Human geoscience

Education

  • 東京大学大学院   新領域創成科学研究科   自然環境学専攻 博士後期課程

    2014.4 - 2018.3

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  • 東京大学大学院   新領域創成科学研究科   自然環境学専攻 修士課程

    2012.4 - 2014.3

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  • Tokyo Gakugei University   教育学部   環境総合科学課程 環境教育専攻

    2007.4 - 2012.3

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Research History

  • Meiji University   School of Arts and Letters   Senior assitant professor

    2023.4

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  • 中央大学理工学部助教

    2021.4 - 2023.3

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  • Japan Society for the Promotion of Science (University of Tsukuba)

    2020.4 - 2021.3

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  • 東京大学大学院   新領域創成科学研究科自然環境学専攻   助教

    2018.4 - 2020.3

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Professional Memberships

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Papers

  • Wetland Environments and Their Response to Climate Change in Heavy Snowfall Mountains in Japan: Focusing on Geomorphological Settings and Soil Moisture Characteristics Reviewed

    Natsuki SASAKI

    Sundai Shigaku (Sundai Historical Review)   179   95 - 121   2023.9

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    Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper (bulletin of university, research institution)  

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  • Mountain Wetland Distributions Controlled by Landforms and Snow Depth at Quaternary Volcanoes in Northeastern Japan: Assessing the Vulnerability of Wetlands to Reduced Snowfall Reviewed

    Natsuki Sasaki, Toshihiko Sugai

    Wetlands   2022.12

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    Authorship：Lead author   Publishing type：Research paper (scientific journal)  

    DOI： 10.1007/s13157-022-01633-8

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  • Geomorphological analysis of wetland distribution on various spatial scales Reviewed

    Natsuki Sasaki, Toshihiko Sugai

    Proceedings of the ICA   2 ( 112 )   1 - 5   2019.7

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    Authorship：Lead author   Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：Copernicus {GmbH}  

    <jats:p>&lt;p&gt;&lt;strong&gt;Abstract.&lt;/strong&gt; This study introduces some case analyses of wetland distribution on various spatial scales, from nationwide to the area of a wetland group, with a focus on geomorphological feature. Then described the usefulness of GIS analysis in wetland research. The nationwide wetland distribution in Japan showed that wetland density was high at less than 200&amp;amp;thinsp;m and around 1600&amp;amp;ndash;2000&amp;amp;thinsp;m. Wetlands in mountainous regions were concentrated in snowy Quaternary volcanic regions from the center to the northern part of Japan. This implied snow accumulation and topography of volcanic mountains are important for wetland formation. Secondly, we clarified that wetlands were mainly distributed on the gentle slope of original volcanic surfaces and in landslides in the Hachimantai volcanic groups, in the northern Japan, using 10-m grid DEM and aerial photo interpretation. With the higher-resolution data, it was clear that wetlands were arranged depending on the microtopography of landslides and volcanic surfaces and groundwater. Using data with resolution suitable for the target topographical size and combining the results of multiple spatial scales/resolutions, we can understand the origin of wetlands in more detail.&lt;/p&gt;
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    DOI： 10.5194/ica-proc-2-112-2019

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  • Wetland formation associated with development of a large-scale landslide in Mt. Funagata, NE Japan Reviewed

    Natsuki Sasaki

    Transactions, Japanese Geomorphological Union   39 ( 1 )   67 - 82   2018

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    Language：Japanese   Publishing type：Research paper (scientific journal)  

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  • Holocene development of mountain wetlands within and outside of landslide in the Hachimantai volcanic group, northeastern Japan Reviewed

    Natsuki Sasaki, Toshihiko Sugai

    QUATERNARY INTERNATIONAL   471   345 - 358   2018

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.quaint.2017.09.045

    Web of Science

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  • Distribution and Development Processes of Wetlands on Landslides in the Hachimantai Volcanic Group, NE Japan Reviewed

    Natsuki SASAKI, Toshihiko SUGAI

    Geog. Rev. Japan B   87 ( 2 )   103 - 114   2015.3

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：The Association of Japanese Geographers  

    This study examines geomorphological controls on the distribution and development of wetlands in the Hachimantai Volcanic Group, northeastern Japan. The study area is dissected by various sizes of landslides and has many wetlands of varied origin. Among 526 wetlands in the study area, 195 are on landslides and account for 63.9% of the total area of wetlands. Wetlands outside of landslides tend to be found in clusters on undissected volcanic surfaces. Many of these are small wetlands in nivation hollows that are supplied by meteoric water from snow, and some of them are ponds in the craters of Hachimantai volcano and large peat bogs on lava flows. Wetlands inside landslides are widely scattered in large or deep depressions along landslide scarps and in small depressions among pressure ridges. Many of these are ponds supplied mainly by groundwater. Large landslides tend to have ponds. On the larger landslides, depressions created by landslide processes provide favorable conditions for the development of wetlands, and their size is constrained by the microtopography of the landslide surface. When drainage channels that dissect landslide bodies breach these closed depressions, the wetlands there progress rapidly from ponds to peat bogs. Landslide activities can create wetlands of various ages, and the dissection of landslide bodies controls the developmental stages of these wetlands. Therefore, a large landslide may contain coexisting wetlands of various ages and types.

    DOI： 10.4157/geogrevjapanb.87.103

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MISC

  • Seasonal variation of soil moisture in mountain wetlands in Sengan volcanic area, northeastern Japan

    Sasaki Natsuki, Sugai Toshihiko

    Proceedings of the General Meeting of the Association of Japanese Geographers   2020 ( 0 )   343 - 343   2020

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    Language：Japanese   Publisher：The Association of Japanese Geographers  

    DOI： 10.14866/ajg.2020s.0_343

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  • Wetland landscape in mountain region created by landslides

    佐々木夏来, 須貝俊彦, 高橋尚志

    日本地球惑星科学連合大会予稿集(Web)   2020   2020

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  • 2018年7月豪雨による斜面災害発生場の地形学的検討(速報)

    須貝俊彦, 佐々木夏来, 高橋尚志, 村木昌弘, 木森大我, 舟津太郎

    地形   40 ( 2 )   2019

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  • Geomorphic condition suitable for wetland formation on a volcanic surface studied from SfM photogrammetry and snow observation in Appi Highland, northeastern Japan

    Sasaki Natsuki, Sugai Toshihiko, Uchiyama Shoichiro, Kungaa Mergen

    Proceedings of the General Meeting of the Association of Japanese Geographers   2018 ( 0 )   90 - 90   2018

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    Language：Japanese   Publisher：The Association of Japanese Geographers  

    DOI： 10.14866/ajg.2018a.0_90

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  • Relationship between volcanic and landslide topography, snow depth, and wetland distribution in Ou Mountains, the northeastern Japan

    Sasaki Natsuki, Sugai Toshihiko

    Proceedings of the General Meeting of the Association of Japanese Geographers   2018 ( 0 )   331 - 331   2018

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    Language：Japanese   Publisher：The Association of Japanese Geographers  

    DOI： 10.14866/ajg.2018s.0_000331

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  • 平成29年7月九州北部豪雨における土砂移動プロセスの特徴と地形発達史的考察(速報)

    宝蔵蓮也, 須貝俊彦, 高橋尚志, 佐々木夏来, 泉田温人

    地形   39 ( 2 )   2018

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  • Wetlands Formation associated with Large-scale Landslide and Subsequent Evolution of Landslide Body in Mt. Funagata, NE Japan

    Sasaki Natsuki, Sugai Toshihiko

    Proceedings of the General Meeting of the Association of Japanese Geographers   2017 ( 0 )   100255 - 100255   2017

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    Language：Japanese   Publisher：The Association of Japanese Geographers  

    DOI： 10.14866/ajg.2017s.0_100255

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  • Distribution of Wetlands and Environment of Formation in Hachimantai Volcanic Group, NE Japan

    Sasaki Natsuki, Sugai Toshihiko

    Proceedings of the General Meeting of the Association of Japanese Geographers   2016 ( 0 )   100043 - 100043   2016

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    Publisher：The Association of Japanese Geographers  

    DOI： 10.14866/ajg.2016s.0_100043

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  • Characteristics and Development Processes of Wetlands on Landslide Masses in Hachimantai Volcanic Group

    Sasaki Natsuki, Sugai Toshihiko

    Proceedings of the General Meeting of the Association of Japanese Geographers   2014 ( 0 )   100336 - 100336   2014

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    Publisher：The Association of Japanese Geographers  

    Variouse type of wetlands are assumed to coexist in a certain region or a large landslide mass. <br>

    DOI： 10.14866/ajg.2014s.0_100336

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  • Relationship between Formation Process of Oyachi Moor in Hachimantai Volcanoes and Landslide Development

    SASAKI Natsuki, SUGAI Toshihiko

    Proceedings of the General Meeting of the Association of Japanese Geographers   2013 ( 0 )   239 - 239   2013

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    Publisher：The Association of Japanese Geographers  

    DOI： 10.14866/ajg.2013s.0_239

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Research Projects

  • 山岳湿地の涵養特性と気候応答性に関する研究

    Grant number：22K13247  2022.4 - 2027.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Early-Career Scientists  Grant-in-Aid for Early-Career Scientists

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    Grant amount：\3250000 （ Direct Cost: \2500000 、 Indirect Cost：\750000 ）

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  • 多雪山地の植生およびその変遷への地形的制約―偽高山帯の有無を中心に―

    Grant number：20K01139  2020.4 - 2023.3

    日本学術振興会  科学研究費助成事業 基盤研究(C)  基盤研究(C)

    池田 敦, 佐々木 夏来

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    Authorship：Coinvestigator(s) 

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

    本州の多雪山地には，オオシラビソが優占する亜高山帯針葉樹林をもつ山と，針葉樹林帯を欠く（偽高山帯が広がる）山がある。それに関してすでに多くの研究があるが，本研究では近年利用可能になった空間情報データを用いることなどで，あらためて偽高山帯形成に寄与する諸要因の階層性や相互関係を議論することを目的としている。
    環境省が公表している1/2.5万植生図と，国土地理院が公表しているDEMをGISソフトウェア上で重ねて解析した。既存の植生図をもとに現在の亜高山帯針葉樹林を構成するオオシラビソ群集とシラビソ－オオシラビソ群集，そしてそれ以外の植生が占有する場に区分し，それぞれの気候・地形条件を比較検討した。シラビソ－オオシラビソ群集は相対的に雪が少ない山域に優占するのに対し，オオシラビソ群集や偽高山帯の分布パターンは，積雪深によって分けられるものではなかった。一方，オオシラビソ群集が優占する山域は，山域全体で傾斜が非常に緩やかという地形条件をもっていた。
    前年度の実施状況報告書「８．今後の研究の推進方策」に記載したとおり，令和3年度5月より令和5年3月末まで休業中のために，令和3年度は実質4月の1ヵ月のみが研究期間であった。その際には休業期間中に赴任予定だった代替教員と，詳細な打ち合わせを実施した。それをもとに，代替教員が一部既設測器を撤収し，破損していた機器が若干あったものの回収されたデータを得た。データの詳細な解析は，研究再開後に実施する。

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  • Hydro-geomorphological condition of wetland formation and responsiveness of wetland to climate change in Quaternay volcanic mountains

    Grant number：20J00310  2020.4 - 2021.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for JSPS Fellows  Grant-in-Aid for JSPS Fellows

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    Grant amount：\4030000 （ Direct Cost: \3100000 、 Indirect Cost：\930000 ）

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  • Effects of climate and geomorphological changes on the formation and development of mountain wetlands

    Grant number：19K20842  2019.4 - 2020.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Research Activity Start-up  Grant-in-Aid for Research Activity Start-up

    Sasaki Natsuki

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    Grant amount：\2990000 （ Direct Cost: \2300000 、 Indirect Cost：\690000 ）

    Mountain wetlands in the Hachimantai volcanic area were classified into three types: snow patch type wetlands, local flat-inflow type wetlands, and landslide wetlands, then the soil moisture variation throughout the year were clarified by observation, and the relationship between development processes of wetlands and climate change were examined from sediment analysis. The snow patch type wetlands are recharged mainly by meteoric water, and the supply of snowmelt water, which continues until mid-June, played an important role in maintaining wetlands. Formation of the wetlands was affected by centennial-to-millennial scale climate change. The other two are recharged by groundwater in addition to meteoric water, and they survived for a longer period than the snow patch type. In particular, development processes and rates of landslide wetlands varied among the wetlands within the same large-scale landslide, controlled by local topographical stability after the initial landslide activity.

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  • 山岳湿地の立地と環境変動に関する研究

    2018.10 - 2020.3

    国土地理協会  学術研究助成 

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    Authorship：Principal investigator 

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