洋河是永定河主要支流之一,是一条多泥沙游荡性河道,流经河北省张家口地区六县一市。从1975年起,经统一规划,统一治理,到1981年完成堤防150多公里,护堤丁坝2000余道。工程建成后,改变了河道的一些基本特征,并对官厅水库的淤积、供水和生态环境产生直接影响。1982年海委在洋河上建立了5个观测站、58个 Yanghe River is one of the main tributaries of the Yongding River. It is a multi-sediment-wandering river flowing through six counties and one city of Zhangjiakou in Hebei Province. From 1975 onwards, through unified planning and unified management, more than 150 km of embankments and over 2,000 dike dikes were completed by 1981. After the completion of the project, some basic features of the river have been changed and the siltation, water supply and ecological environment of the Guanting Reservoir have a direct impact. In 1982, the IOC established 5 observation stations on Yanghe River, 58