伊洛河流域水沙特征变化分析

Analysis on Variation Characteristics of Water and Sediment in Yiluo River Basin

依据伊洛河黑石关水文站及以上区域141个雨量站1956-2020年的水文观测数据,对伊洛河流域的水沙变化及影响因素进行了分析。结果表明:伊洛河流域降水量、径流量、输沙量均呈下降趋势,以1990年为界,降水量减小了6.40%,径流量减小了23.30%,输沙量减小了96%;年降水量序列没有明显的变化趋势,年径流量在1990年前后发生了1次突变,年输沙量在1967、1989和2007年前后发生了3次突变,综合考虑径流和泥沙的年含沙量后,年含沙量在1970,1989和2007年前后发生了3次突变。

Based on the hydrological observation data of HeiShi about hydrological station of Yiluo River and 141 rainfall stations in the above areas from 1956 to 2020,the water and sediment changes and influencing factors in Yiluo River Basin are analyzed.The results show that:the precipitation,runoff and sediment transport in Yiluo River Basin show a downward trend.Compared with 1990,the precipitation,runoff and sediment transport are reduced by 6.40%,23.30%and 96.00%;There is no obvious change trend in the annual precipitation series.The annual runoff has a sudden change around 1990,and the annual sediment transport has three sudden changes around 1967,1989 and 2007.After comprehensively considering the annual sediment concentration of runoff and sediment,the annual sediment concentration has three sudden changes around 1970,1989 and 2007.