经统计分析 ,七星河保安水文站输沙量有两个明显变化 ,一个是春汛对输沙量的影响很大 ,另一个是汛期降水径流对输沙量的影响。该站输沙量主要集中在 4～ 8月 ,占年输沙量的 90 %,相应的径流量主要集中在 4～ 9月 ,占年径流量的 86%,可以看出输沙量比径流量在年内分配集中提前一个月 According to the statistical analysis, there are two obvious changes in sediment load at Qixinghe Security and Hydrological Station. One is that flood season has a great influence on sediment discharge and the other is the influence of precipitation runoff during the flood season on sediment discharge. Sediment concentration in the station mainly concentrated in April to August, accounting for 90% of the annual sediment discharge, the corresponding runoff mainly concentrated in the 4 ~ September, accounting for 86% of annual runoff, we can see that the ratio of sediment transport The distribution of flow during the year focused on one month in advance