Effect of storm movement on flood peaks: Analysis framework based on characteristic timescales
Effect of storm movement on flood peaks: Analysis framework based on characteristic timescales
复制标题
DOI：
10.1029/2011wr011761
复制
发表时间：
2012-05
影响因子：
5.4
通讯作者：
Y. Seo;A. Schmidt;M. Sivapalan
中科院分区：
文献类型：
--
作者：
Y. Seo;A. Schmidt;M. Sivapalan
本文的目的是调查，在一般情况下，风暴运动对由此产生的洪峰的影响，以及潜在的过程控制。为了这个目的，我们利用一个广泛的理论框架，使用与固定的暴雨以及移动暴雨的特征时间和空间尺度。对于一个平稳的暴雨的特征时间尺度，支配的峰值响应包括两个内在的时间尺度的集水区和一个外在的时间尺度的暴雨。另一方面，对于一个移动的暴雨，需要两个额外的外在尺度，风暴旅行时间和风暴大小。稳定暴雨的峰值响应和时间尺度之间的关系可以直接扩展到描述移动暴雨的峰值响应。然而，降雨持续时间和暴雨传播时间之间的相互依赖性使得移动暴雨的峰值响应行为与静止暴雨的峰值响应行为有着根本的不同。我们发现，峰值响应和特征时间尺度之间的关系也取决于相对大小的暴雨集水面积。对于移动暴雨，我们发现，峰值响应的增强产生的叠加子集水区的响应（共振条件）和子集水区的响应增加，由于持续时间增加（相互依存），这导致最大峰值响应时，移动暴雨是慢于通道流速的效果。
The aim of this paper is to investigate, in general terms, the effects of storm movement on the resulting flood peaks, and the underlying process controls. For this purpose, we utilize a broad theoretical framework that uses characteristic time and space scales associated with stationary rainstorms as well as moving rainstorms. For a stationary rainstorm the characteristic timescales that govern the peak response include two intrinsic timescales of a catchment and one extrinsic timescale of a rainstorm. On the other hand, for a moving rainstorm, two additional extrinsic scales are required, the storm travel time and storm size. The relationship between the peak response and the timescales appropriate for a stationary rainstorm can be extended in a straightforward manner to describe the peak response for a moving rainstorm. However, the interdependence between rainfall duration and storm travel time makes the behavior of the peak response for a moving rainstorm fundamentally different from that of a stationary rainstorm. We show that the relationship between peak response and characteristic timescales also depends on the relative size of the rainstorm with respect to catchment size. For moving rainstorms, we show that the augmentation of peak response arises from both the effect of overlaying the responses from subcatchments (resonance condition) and the effect of increased responses from subcatchments due to increased duration (interdependence), which results in maximum peak response when the moving rainstorm is slower than the channel flow velocity.