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根据三峡工程运用前后的实测水文资料,分析了松滋口分流分沙的年际、年内变化规律及其成因,并研究了三峡工程蓄水以来松滋口分沙比递增的缘由.研究表明,影响松滋口分流分沙最直接的两个因素是口门附近水位和口门高程;三峡工程运用后松滋口年内分流和分沙量更集中在6—9月,10月的分流分沙量均明显减少,但年分流比的变化不大,松滋口口门河道冲刷引起该口门分沙比递增;并预计未来一段时间内松滋口分流比将变化不大,如扣除口门河道冲刷的影响,则分沙比仍将变化不大.
According to the measured hydrological data before and after the Three Gorges Project was used, the interannual and annual variation rules and causes of Songshikou diversion and sediment were analyzed, and the reasons for the increasing of Songzikou sediment yield were discussed. The two most direct factors influencing Songshikou diversion and sediment removal are the water level near the gate and the elevation of the mouth gate. After the Three Gorges Project was used, the annual shunt and sediment concentration of Songzhikou concentrated more in June-September. In the shunt and sediment discharge in October, But the annual diversion ratio did not change much. The flushing of Songzijian estuary led to an increase of this ratio. It is also expected that the shunt ratio will not change much in the near future. For example, Impact of river erosion, then the ratio of sediment will change little.