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为分析时间步长对次洪产沙模拟的影响,以淮河上游大坡岭水文站以上流域为研究区域,选取2001~2010年具有代表性的10场次洪降雨、径流和含沙量等资料,分别以0.5、1h为时间步长,利用泥沙负荷模型模拟计算了10场次洪产沙过程。结果表明,泥沙负荷模型的9个参数中参数b5、b6、b8随时间步长的变化而变化,且步长变化对b5、b8的影响最大;以沙峰相对误差、确定性系数和峰现时差三个指标综合衡量,时间步长为0.5h的模拟精度总体上高于时间步长为1h的模拟精度。研究成果可为淮河流域及湿润半湿润地区土壤侵蚀模拟提供参考。
In order to analyze the impact of time step on the flood inflow simulation, taking the watershed above the Dapoling Hydrological Station upstream of the Huaihe River as the study area, 10 representative floods, runoffs and sediment concentrations from 2001 to 2010 were selected. Using 0.5 and 1 h as time steps respectively, sediment load model was used to simulate 10 flood discharge processes. The results show that the parameters b5, b6 and b8 of 9 parameters of sediment load model change with the time step, and the change of step length has the biggest influence on b5 and b8. Taking the relative error of sand peak, the deterministic coefficient and the peak The current three indicators of a comprehensive measure of the time step of 0.5h simulation accuracy is generally higher than the time step of 1h simulation accuracy. The research results can provide reference for soil erosion simulation in the Huaihe River Basin and humid and semi-humid areas.