洋河干流水沙变化对下游灌区的影响研究

Study on Impact of Water and Sediment Changes in the Yanghe River Mainstream on Downstream Irrigation Areas

为研究洋河干流近期水沙变化对下游灌区的影响,分析洋河二灌区施行新型节水灌溉方式后引水含沙量及泥沙粒径特征,统计怀来气象站和洋河干流响水堡水文站1964—2019年长系列降水、径流和含沙量的变化情况。结果表明,非汛期时段洋河二灌区具有高于90%的概率可以取到低于规范标准含沙量的水流,且未来灌区引水断面含沙量不会有大幅增加的趋势。

In order to study the recent changes in water and sediment in the mainstream of Yanghe River and their impact on the downstream irrigation areas,this paper analyzes the water inflow sediment content and particle size characteristics in the Yanghe River's No.2 irrigation area after the implementation of a new water-saving irrigation method.It also compiles data on long-series precipitation,runoff,and sediment content from 1964 to 2019 at the Huailai Meteorological Station and the Yanghe River mainstream Xiangshuibao Hydrological Station.The results indicate that during non-flood periods,the Yanghe River's No.2 irrigation area has a probability of over 90%of receiving water with sediment content below the standard requirements,and there is no significant increasing trend in sediment content at the irrigation diversion section in the future.