柳河上游水沙特性及河道断面变化特征分析

Analysis on the characteristics of water sediment characteristics in the upper reaches of Liuhe River and variation of river channel section

河道冲淤变化与流域来沙状况密不可分,本文研究以柳河中段彰武水文站数据为切入点,对该站1980—2018年所测数据进行数学分析。结合典型断面套绘图,利用一元线性回归预测和滑动平均等方法,总结出了柳河上游多年来水沙变化特征,即:径流量缓慢提升,含沙、输沙量降幅显著。“十三五”以来,柳河上游水土保持取得阶段性成果,趋势线预测该流域沙量有连续下降的态势,加大治理力度是“十四五”时期重要工作。

The change of river channel erosion and siltation is closely related to the sediment inflow in the river basin.The study is started with the data from Zhangwu Hydrological Station in the middle part of Liuhe River.The data measured at the station from 1980 to 2018 is mathematically analyzed.The characteristics of runoff and sediment change in the upper reaches of Liuhe River in recent years are summarized based on the mapping of typical sections according to the methods of unary linear regression prediction,moving average,etc.The characteristics include the follows:the runoff is increased slowly,the sediment content and sediment transportation are decreased significantly.Soil and water conservation in the upper reaches of Liuhe River has achieved periodic achievements since the 13th Five-Year Plan,and the trend line predicts that the sediment amount in the basin is continuously declined.The control efforts should be strengthened as an important work in the 14th Five-year Plan.