一九六五年春,黄委会春修整險工作組,在河南花园口至东坝头河段南岸各險工,对水下根石情况进行了调查研究,現将几个問題簡述如下。一、水下根石情况的分析 (一)根石的深度和寬度: 根石断面位置按平面部位可分迎水面、上跨角、墳头、下跨角、背水面等五个部位(如图1)。 In the spring of 1965, the Yellow River Committee Spring Rehabilitation Working Group conducted various investigations and studies on the underwater roots and stones from the Huayuankou to the south bank of Dongbaitou section of Henan Province. A few questions are briefly described as follows. First, the analysis of the underwater conditions (a) the depth and width of the root stone: the location of the root section can be divided according to the plane of the water level across the surface, the span, mound, under the span, the back surface of five parts (Figure 1) .