Analysis of Sedimentation Pattern of Dongyang River and Xiyang River in Xiaolangdi Reservoir Region

With regard to the sedimentation of branch rivers that is affected by the sedimentation of Xiaolangdi Reservoir after water storage,this paper introduces the arrangement of sediment observation sections in the main stream and branch rivers and test method by taking the Dongyang river and Xiyang river for an example,which are branches within the Xiaolangdi reservoir region.And then the observation results of sediment siltation are analyzed.The results show that the siltation at the delta of main stream has formed river mouth weirs,which results in diminution of longitudinal grade of branch river bottom and even adverse slope appeared.The aforementioned phenomenon would bring forth adverse effects to the operation of Xiaolangdi reservoir and to sediment discharge of Yellow River main stream and its branches.Therefore,it is necessity to deeper research for seeking prevention measures.