| 研究課題/領域番号 |
19F19052
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| 研究種目 |
特別研究員奨励費
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| 配分区分 | 補助金 |
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| 応募区分 | 外国 |
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| 審査区分 |
小区分25030:防災工学関連
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| 研究機関 | 京都大学 |
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研究代表者 |
川池 健司 京都大学, 防災研究所, 准教授 (10346934)
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| 研究分担者 |
TALCHABHADEL ROCKY 京都大学, 防災研究所, 外国人特別研究員
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| 研究期間 (年度) |
2019-04-25 – 2021-03-31
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| 研究課題ステータス |
交付 (2020年度)
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| 配分額 *注記 |
2,300千円 (直接経費: 2,300千円)
2020年度: 1,100千円 (直接経費: 1,100千円)
2019年度: 1,200千円 (直接経費: 1,200千円)
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| キーワード | climate change / sediment yield / rainfall erosibity |
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| 研究開始時の研究の概要 |
The study aims to conduct integrated modeling for sediment management in a watershed of dynamic land use. A watershed in Nepal which consists both hilly and flat terrain is selected. We will assess the effects of land use change on sediment yield, its transport and river hydraulics and we will also attempt to simulate in projected climate and land use scenarios. Firstly, we will assess the baseline condition. The sediment yield from upland catchment will be estimated and validated with historical data. Under changing climate and land use the sediment yield and transport will be assessed.
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| 研究実績の概要 |
The main purpose of our study is to conduct integrated modelling for sediment management in a watershed of dynamic land use. A watershed in Nepal that consists of both hilly and flat terrain was selected to assess sediment yield from the hill and its effects on riverbed evolution at flat terrain. Last year, we analysed the sediment yield of the study area Under the changing climate. We published two peer-reviewed journal papers.
The sediment yield of the study area was carried out under a baseline time period. From the field visits, different data related to hydro-meteorology, soil, land use land cover (LULC), elevation, and topographical data were collected. We also evaluated the applicability of citizen-science (CS) data for watershed management in a small watershed in Kathmandu valley, Nepal. The sediment yield estimation model was validated with the observed data. Then sediment yields are projected for different future time periods: the near-future (2025-2050), mid-future (2051-2075) and far-future (2076-2100) under different warming scenarios using different climate models. Both physically-based models and empirical models were employed for the estimation.
Currently, two manuscripts are under review: 1) International Journal of Climatology and 2) Hydrological Sciences Journal. The first one focuses on spatio-temporal distribution of extreme precipitation indices in the study area in both present and future scenarios whereas the latter focuses on rainfall-runoff and inundation modelling during extreme precipitation events. We would now focus on changing LULC.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
We are closely working and collaborating with many researchers. A field visit carried at an initial time of last year helped a lot to collect preliminary and secondary data. We are regularly taking advice and suggestions from researchers and professors of Nepal regarding the problems and requirements of the study.
Some of the collected data are yet to be analysed. At the same time, we tried to assess the potential of utilizing remotely sensed data like satellites-derived rainfall estimates.
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| 今後の研究の推進方策 |
We will emphasize our research under changing land-use practices. A land-use change model will be developed. The sediment yield from upland catchment will be estimated using a numerical model and validated with historical data. The developed model will be used to estimate the projected land-use practices. We will also assess remotely assessed data (different satellite images) for meteorological, soil and land use inputs along with the observed data. Firstly, the model will be validated against the observed sediment data. Under a combination of changing land use and climate change for different future time periods, the sediment yield and transport will be assessed and quantified using the developed model.
We will also propose some low budget CS-based rainfall, water level, and sediment monitoring stations in collaboration with Smartphones4water (S4W) Nepal for continuous measurement. A field visit will be made for sharing last year's outcome in a national/international conference in Nepal and for collecting further data from the field for the research. During the field visit, land use and soil data of the study area will be collected from primary (the site) and different departments. Data on agricultural practices, watershed management and the information of their temporal changes will also be collected. We will try to collect some additional cross-sectional data of the river.
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