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以长江中下游新厂、监利、螺山、汉口、大通５个水文站流量、平均流速、河宽、平均水深、断面形态等资料，以及枝城、石首、城陵矶、汉口。武穴、芜湖６个水位站资料为代表，宏观分析长河段水流阻力。分别以１９５６～１９６８年以及１９７５～１９８７年水文系列代表裁弯前后和丹江口水库蓄水运用前后长江中下游河道所处的状态，对比分析各长河段形态和水力因素的变化，求出综合阻力系数与平均水深的关系。对影响综合阻力的因素进行了初步分析，并比较了代表不同河型的长河段阻力系数的差别。
Based on the data of five hydrological stations including the new plant in the middle and lower reaches of the Yangtze River, Jianli, Jianlu, Luoshan, Hankou and Chase, the average flow velocity, river width, average depth of water and the cross-section shape of the stations, as well as Zhicheng, Shishou, Chenglingji and Hankou. Wuxue, Wuhu six water level station data as a representative, macroscopic analysis of long river flow resistance. The status of rivers in the middle and lower reaches of the Yangtze River before and after the dams were cut off before and after the dams were cut off from 1956 to 1968 and from 1975 to 1987 and before and after the Danjiangkou reservoir was put into operation were analyzed respectively and the changes of the morphology and hydraulic factors of each long river were analyzed. Relationship with average water depth. The factors that affect the comprehensive resistance are analyzed preliminarily. The differences of the drag coefficients of long river sections representing different river types are compared.