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本文主要讨论内容有三 :一是研究分析兰州以下无实测冲淤变化资料河段的主河槽冲淤厚度。二是对有实测断面法冲淤量河段 ,可用沙量平衡方程计算综合误差值 ;如用沙量平衡计算的冲淤量实际上包括了综合误差。三是用无实测冲淤变化资料河段 ,本文用同流量水位法和沙量平衡法估算兰州以下各个河段的冲淤厚度。还引用不同研究人员用沙量平衡法计算的头道拐—龙门河段 195 9～ 1989年冲淤量 ,说明其沙量平衡法计算的冲淤量不能反映实际的河道冲淤情况。
The main contents of this paper are as follows: First, we study and analyze the thickness of the main fluvial scouring and silting in the non-measured changes of erosion and deposition below Lanzhou. Second, there is a measured cross-section of the method of scouring and water volume, the sand balance equation can be used to calculate the integrated error value; as calculated by the amount of sand and silt balance calculation actually includes the integrated error. The third is to use non-measured erosion and deposition of changes in the river, in this paper, the same flow level method and sediment balance method to estimate the following Lanzhou scouring silt thickness. The amount of scour and silting in the headway - Longmen reach 195 ~ 1989 calculated by the sand balance method by different researchers was also quoted, indicating that the amount of scour and silting calculated by the sand balance method can not reflect the actual situation of river scouring and silting.