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实测资料分析表明,汛后退水过程中,当水位退至82航行基面以上6m时,长江中游水道浅滩开始冲刷,与此对应的河宽称为归槽河宽.长江中游水道归槽河宽存在临界值,当实际归槽河宽大于临界归槽河宽时,水道可能碍航,而当实际归槽河宽小于临界归槽河宽时,航道条件较好.实测资料统计及理论分析表明,沙市—藕池口、藕池口—城陵矶、城陵矶—武汉、武汉—九江临界归槽河宽分别约为1 300～1 500m、900～1 100m、1 500～1 700m、1 800～1 900m,随设计水位及航道尺度不同而有所变化.三峡水库蓄水后,沙量减小,洲滩萎缩,归槽河宽增加,应及时对归槽河宽接近或大于临界归槽河宽水道中的关键洲滩进行守护,防止归槽河宽进一步增加导致航道条件恶化.
The measured data analysis shows that when the water level retreats to 6m above the base level of 82 during the retreating flood season, the shoal of the channel in the middle reaches of the Yangtze River begins to scour, and the river width corresponding to this river is called the return river width. There is a critical value, when the actual return trough river width is greater than the critical return trough width, the waterway may be obstructed, and when the actual trenching river width is less than the critical trenching river width, the waterway conditions are good.Statistical data and theoretical analysis show that , Respectively. The widths of the floodplains in Shashi - Ouchi, Ouchichi - Chenglingji, Chenglingji - Wuhan and Jiujiang are about 1 300 ~ 1 500m, 900 ~ 1 100m, 1 500 ~ 1 700m and 1 800 ~ 1 900m, with the design of the water level and the channel size varies.Through the Three Gorges Reservoir impoundment, the amount of sediment decreases, the beach shrank, the return of the width of the river increases, it should promptly return to the trenched river width close to or greater than the critical trenched river The key banks of the wide watercourse are guarded to prevent any further deterioration of the conditions of the navigation channel by preventing further increases in the width of the trenching river.