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Preliminary Study of Computational Time Steps in a Physically Based Distributed Rainfall–Runoff Model

机译:物理基于分布式降雨模型的计算时间步骤初步研究

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摘要

The choice of the computational time step (dt) value and the method for setting dt can have a bearing on the accuracy and performance of a simulation, and this effect has not been comprehensively researched across different simulation conditions. In this study, the effects of the fixed time step (FTS) method and the automatic time step (ATS) method on the simulated runoff of a distributed rainfall–runoff model were compared. The results revealed that the ATS method had less peak flow variability than the FTS method for the virtual catchment. In the FTS method, the difference in time step had more impact on the runoff simulation results than the other factors such as differences in the amount of rainfall, the density of the stream network, or the spatial resolution of the input data. Different optimal parameter values according to the computational time step were found when FTS and ATS were used in a real catchment, and the changes in the optimal parameter values were smaller in ATS than in FTS. The results of our analyses can help to yield reliable runoff simulation results.
机译:计算时间步长(DT)值的选择和用于设置DT的方法可以具有轴承的仿真精度和性能,并且在不同的仿真条件下尚未全面研究这种效果。在该研究中,比较了固定时间步骤(FTS)方法的影响和自动时间步长(ATS)方法对分布式降雨径流模型的模拟径流。结果表明,ATS方法的峰值流动可变性较少,而不是虚拟集水区的FTS方法。在FTS方法中,时间步骤的差异对径流模拟结果的影响比其他因素(例如降雨量),流网络的密度或输入数据的空间分辨率的差异产生更多的影响。当FTS和ATS在真实集水区中使用时,找到根据计算时间步骤的不同最佳参数值,并且最佳参数值的变化在ATS中比FTS更小。我们的分析结果可以帮助产生可靠的径流模拟结果。

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