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首页> 外文期刊>Journal of hydrologic engineering >Effects of Watershed Subdivision on Peak Discharge in Rainfall-Runoff Modeling in the WinTR-20 Model
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Effects of Watershed Subdivision on Peak Discharge in Rainfall-Runoff Modeling in the WinTR-20 Model

机译：WinTR-20模型中流域细分对降雨径流模型中峰值流量的影响

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摘要

The rainfall-runoff model, WinTR-20, uses subdivision to simulate runoff behavior for complex watersheds exhibiting heterogeneous conditions or storage. It has been shown by others that subdivision generally causes the predicted peak discharge to increase, though the underlying processes are often obscured by watershed complexity. This study instead focuses on a simplified, theoretical watershed, systematically comparing the unsubdivided watershed with a two-subbasin model in order to determine the most sensitive factors. Peak discharge sensitivity is evaluated with respect to (1) series subdivision with varying total area, (2) parallel subdivision with varying proportional area, (3) parallel subdivision with varying curve number, and (4) parallel subdivision with simultaneously varying area and curve numbers. Peak discharge is most sensitive to differences in curve number, which controls both the runoff volume and peak timing. Serial subdivision was found to produce a significant high peak discharge, regardless of relative area, while parallel subdivision produced a smaller and more variable effect, either increasing or decreasing peak flow based on the area ratio. Using these subdivision sensitivities, general guidelines are presented for the rational subdivision in rainfall-runoff modeling. For example, subdivision is recommended when subarea curve numbers differ by more than five and the relative sizes of subareas influence the effects of discretization.
机译：降雨径流模型WinTR-20使用细分来模拟表现出非均质条件或存储的复杂流域的径流行为。其他人已经表明，细分通常会导致预测的峰值流量增加，尽管分水岭的复杂性通常会掩盖潜在的过程。相反，本研究着重于简化的理论分水岭，系统地将未细分的分水岭与两流域模型进行比较，以确定最敏感的因素。针对（1）总面积变化的串联细分，（2）比例面积变化的平行细分，（3）曲线数量变化的平行细分以及（4）面积和曲线同时变化的平行细分评估峰值放电灵敏度数字。峰值流量对曲线数量的差异最敏感，该数量控制着径流量和峰值时间。不论相对面积如何，都发现串联细分产生明显的高峰值放电，而并联细分产生较小且变化更大的效果，基于面积比增加或减少峰值流量。利用这些细分敏感性，提出了降雨径流模型中合理细分的一般准则。例如，当分区曲线的数量相差超过五且分区的相对大小影响离散化的效果时，建议进行细分。

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