Integrated modelling for sediment management in a watershed of dynamic land use

动态土地利用流域沉积物管理综合建模

• 批准号: 19F19052
• 负责人: 川池 健司
• 金额: $ 1.47万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for JSPS Fellows
• 财政年份: 2019
• 资助国家: 日本
• 起止时间: 2019-04-25 至 2021-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-19F19052/
• 关键词: climate change; sediment yield; rainfall erosibity

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.

我们研究的主要目的是进行综合模拟泥沙管理的流域动态土地利用。在尼泊尔的一个集水区，包括丘陵和平坦的地形被选中来评估产沙量从山上和它对河床演变的影响在平坦的地形。去年，我们分析了研究区在气候变化下的产沙量。我们发表了两篇同行评议的期刊论文，研究区的产沙量是在一个基线时间段内进行的。通过实地考察，收集了与水文气象、土壤、土地利用/土地覆盖、海拔和地形数据有关的不同数据。我们还评估了公民科学（CS）数据的流域管理在尼泊尔加德满都山谷的小流域的适用性。利用实测资料对模型进行了验证。在此基础上，利用不同的气候模式，对未来不同时段（近期（2025-2050年）、中期（2051-2075年）和远期（2076-2100年））的产沙量进行了预测。目前，两篇论文正在审查中：1）国际气候学杂志和2）水文科学杂志。第一个侧重于极端降水指数的时空分布在研究区域在目前和未来的情况下，而后者侧重于极端降水事件期间的径流和洪水建模。我们现在将重点放在改变LULC上。

项目成果

Estimation of anticipated climate change impact on sediment yield: A case study of West Rapti basin, Nepal

估计气候变化对产沙量的影响：以尼泊尔西拉普蒂盆地为例

• 发表时间: 2019
• 作者: Rocky Talchabhadel;Rajaram Prajapati;Hajime Nakagawa;Kenji Kawaike
• 通讯作者: Kenji Kawaike

Effects of DEM accuracy on sediment modelling results

DEM 精度对沉积物模拟结果的影响

• 发表时间: 2019
• 作者: Rocky Talchabhadel;Hajime Nakagawa;Kenji Kawaike
• 通讯作者: Kenji Kawaike

ANTICIPATED IMPACTS OF CLIMATE CHANGE ONRAINFALL EROSIVITY OVER NEPAL

• DOI: 10.3850/38wc092019-1264
• 发表时间: 2019-09
• 期刊: 38th IAHR World Congress - "Water: Connecting the World"
• 作者: Rocky Talchabhadel;Anil Aryal;M. Maharjan;Rajaram Prajapati;H. Nakagawa;K. Kawaike

Future assessment of rainfall erosivity (R-factor) in West Rapti Basin, NEPAL based on RUSLE and CMIP5 climate models

基于 RUSLE 和 CMIP5 气候模型对尼泊尔西拉普蒂盆地降雨侵蚀力（R 因子）的未来评估

• 发表时间: 2019
• 期刊: Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)
• 作者: Rocky Talchabhadel;Hajime Nakagawa;Kenji Kawaike;Kazuki Yamanoi;and Anil Aryal
• 通讯作者: and Anil Aryal

Citizen science can provide valuable and complementary information in water resources management: A case study of urban flood assessment in Hanumante River Basin, Nepal

公民科学可以为水资源管理提供有价值的补充信息：尼泊尔哈努曼特河流域城市洪水评估案例研究

• 发表时间: 2020
• 作者: Rocky Talchabhadel;Rajaram Prajapati;Hajime Nakagawa;Kenji Kawaike;Kazuki Yamanoi;Jeffrey C. Davids
• 通讯作者: Jeffrey C. Davids