4.6 Article

Impact of Rainfall Movement on Flash Flood Response: A Synthetic Study of a Semi-Arid Mountainous Catchment

期刊

WATER
卷 14, 期 12, 页码 -

出版社

MDPI
DOI: 10.3390/w14121844

关键词

storm movement; rainfall; runoff simulation; runoff generation; flash-flood; rainfall variability

资金

  1. Federal Ministry of Education and Research (BMBF) [13N15180]

向作者/读者索取更多资源

Rainfall's spatiotemporal variability plays a key role in catchment runoff and flood response. This study assesses the sensitivity of runoff and flooded areas to rainfall movement in the Kan catchment (Iran). The results show that rainfall movement affects the runoff response, with higher velocities resulting in higher peaks and faster onsets of runoff. The direction of movement also plays a role, with storms moving along the average direction of the stream resulting in higher peaks and flooded areas. The influence of rainfall movement is also modulated by hyetograph structure and location within the drainage network.
Rainfall is a spatiotemporally varied process and key to accurately capturing catchment runoff and determining flood response. Flash flood response of a catchment can be strongly governed by a rainfall's spatiotemporal variability and is influenced by storm movement which drives a continuous spatiotemporal change throughout a rainfall event. In this work, the sensitivity of runoff and flooded areas to rainfall movement are assessed in the Kan catchment (Iran). The allochthonous nature of floods in the catchment and how they interact with the effects of rainfall movement are investigated. Fifty synthetic rain hyetographs are generated and traversed over the catchment under different velocities and directions and used to force a 1D/2D hydrodynamic model. The results suggest rainfall movement affects the runoff response in different degrees. Peak discharge, hydrograph shapes and flooded areas are affected. Storms with higher velocities result in higher peaks and faster onsets of runoff and consequently higher flooded areas in comparison to slower storms. The direction of the movement also plays a role. Storms moving along the average direction of the stream result in higher peaks and flooded areas. The relevance of storm direction is greater for slow moving storms. Additionally, the influence of rainfall movement is modulated by hyetograph structure, and the allochthonous behavior is greatly dependent on the location within the drainage network at which it is assessed.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.6
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据