Characteristics and Impact Factors Analysis of Water and Sediment Changes in the Downstream of the Yellow River
The water and sediment evolution in the downstream of the Yellow River is severe.To explore the law of water and sediment changes in the downstream of the Yellow River and clarify the main factors affecting water and sediment changes,this study is based on water and sediment data from four hydrological stations in the downstream of the Yellow River,including Huayuankou,Gaocun,Aishan,and Lijin.Using mean difference t-test and parameter statistics methods,the characteristics of water and sediment changes in the downstream of the Yellow River at different time scales from 1951 to 2020 were analyzed,and the influencing factors of water and sediment evolution were explored.The results show that,in the past 70 years,the runoff and sediment transport in the downstream of the Yellow River have generally shown a decreasing trend,and the time of their sudden changes is not consistent.There are significant intergenerational differences in runoff and sediment con-tent,and they show a decreasing trend with intergenerational fluctuations;at the same time,the runoff and sedi-ment transport of the four hydrological stations during the study period showed spatiotemporal asynchrony in their changes.The distribution of flow and sediment concentration is concentrated within the year,since the Yellow River water and sediment regulation,the peak flow has shifted from August to July,and the flow and sediment concentration show phased changes in different periods.Human activities are the dominant factor af-fecting the evolution of water and sediment in the downstream of the Yellow River.
runoffsediment transportmutation analysisthe downstream of the Yellow River
NETL
NSTL
万方数据
