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为了研究三峡水库运用对进出库水沙条件的影响程度,利用水沙指标变化幅度公式,定量分析了三峡水库运用后2003~2009年进出库水沙指标的变幅。结果表明,三峡水库运用后,在均值上,4、5、6月的月均流量变幅最大,6、10、11月的月均含沙量和月均输沙率变幅最大,5、6、11月的月均来沙系数变幅最大;在极值上,非汛期最大流量、汛期最小含沙量、最小来沙系数和最小输沙率变幅最大;在极值之比上,汛期流量、含沙量、来沙系数和输沙率的最大/最小的变幅最大;在极值与年值之比上,汛期流量的最小/年均及非汛期含沙量、汛期来沙系数、年输沙率的最大/年均的变幅最大;在年内分布上,4、5、10月的月均流量/年均流量、5、6、8月的月均含沙量/年均含沙量和月均输沙率/年均输沙率、5、8、9月的月均来沙系数/年均来沙系数、汛期输沙率/非汛期输沙率、汛期含沙量/非汛期含沙量的变幅最大。
In order to study the impact of the Three Gorges Reservoir on the water and sediment conditions of the inbound and outbound reservoirs, the variation range of water inflow and outflow index of the Three Gorges Reservoir was quantitatively analyzed from 2003 to 2009 after the Three Gorges Reservoir was used. The results show that after the Three Gorges Reservoir is used, monthly mean flow rate is the largest in April, May and June, with the monthly mean sediment content and monthly average sediment transport rate increasing in June, October and November, In June and November, the monthly mean variation of monthly sediment yield was the largest. At the extreme value, the maximum flow rate in non-flood season, the minimum sediment concentration in flood season, the minimum sediment exchange coefficient and the minimum sediment transport rate were the largest. On the extreme ratio, In the flood season, the maximum / minimum fluctuation range of flow rate, sediment concentration, sediment yield and sediment transport rate was the largest. In the ratio of the extreme value and the annual value, the minimum / annual average and non-flood sediment concentration in flood season, Coefficient, annual sediment transport rate of the maximum / annual average maximum amplitude; in the distribution of the year, April, May and October monthly average flow rate, average monthly sediment concentration in May, June and August / year Average sediment concentration and average sediment transport rate / average annual sediment transport rate, monthly mean sediment yield in May, August and September / annual mean sediment yield, sediment transport rate in flood season / sediment transport rate in non-flood season, sand content in flood season Volume / non-flood season, the largest changes in sediment concentration.