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确定良好的水文资料代表系列,对有效模拟河床演变有着重要的意义。通过采用时窗滑动平均法,选取不同长度的时窗分别对长系列水沙资料进行了滑动平均计算,确定出最优时窗的代表系列作为河工模型试验的水沙施放过程。最后,将其应用于灞河河工模型试验中,并与西北水利科学研究所2001年所做的正态河工模型试验之平衡河床成果相比较。结果表明:灞河B#坝库区在运行6年后,其河床达到冲淤平衡,与正态河工模型试验的平衡河床结果相符合。说明本河工模型试验所选用的水沙代表系列是正确的,所采用的时窗滑动平均法具有良好的适用性。
Determining good representative series of hydrological data is of great significance for the effective simulation of riverbed evolution. By using the time-window sliding averaging method, the long-run water-sediment data were calculated by using different length time windows, and the representative series of optimal time windows were determined as the water and sediment release process of river model test. Finally, it was applied to the Tahe river model test and compared with the balanced river bed results of the normal river model test conducted by Northwest Institute of Hydraulic Research in 2001. The results show that after 6 years of operation, the riverbed of Bahe dam in Bahe River reaches balance of scouring and silting, which is in accordance with the results of balanced riverbed in normal river model test. It shows that the series of water and sediment selected by this river model test is correct, and the time-window sliding average method adopted has good applicability.