降水偏小对河龙区间晋西北片各支流综合治理减沙量的影响分析

Impact of Less-than-Normal Precipitation on Sediment Reduction Caused by Comprehensive Harnessing in Tributaries in Section of Northwestern Shanxi Province of Hekouzhen-Longmen Reaches of Yellow River

根据实测资料,对河龙区间晋西北片降雨产洪沙规律、降雨变化影响减沙所占比例等问题进行了分析,重点探讨了如何建立降雨产洪沙模型,并改进降雨影响减沙量计算方法,对降水量偏小对综合治理减沙量的影响进行了分析。研究成果为晋西北片各支流的综合治理提供了科学依据,可供黄河中游地区水沙变化深化研究时参考。

According to observed data, the laws of runoff and sediment yield and the impact of precipitation variation on the sediment-reducing rate of comprehensive sediment capture in tributaries, in northwestern Shanxi province, of the Hekouzhen - Longmen reaches of the Yellow river are analyzed. The two main problems, including the establishment of a runoff and sediment yield model and the improvement of the calculating method for sediment reduction due to precipitation variation, are emphatically discussed. The impact of less-than-normal precipitation on the sediment reduction caused by comprehensive sediment capture is analyzed too. The results may provide a scientific basis for the compressive sediment capture in the tributaries of the Yellow river in northwestern Shanxi province, and can be used as an important reference for further research on water and sediment variation in middle reaches of the Yellow river.