黄河近百年径流演变特征分析.

In order to explore the evolution characteristics of runoff in the Yellow River basin, this paper analyzed the natural runoff data of Huayuankou Hydrological Station from 1919 to 2016 for nearly 100 years. The order of clustering analysis, Mann-Kendall mutation test and sliding t-average method were used to analyze the mutation points of the runoff sequence in Huayuankou Hydrological Station. Linear trend regression test, Mann-Kendall trend test and Spearmann rank correlation test were used to analyze the trend of the runoff series before and after the mutation point. The results show that the runoff mutations in the Yellow River basin were relatively obvious at 1933-1934 and 1989-1990. The mutation of the former is mainly caused by large-scale changes in natural factors (such as temperature, precipitation), and the latter is mainly caused by changes in the basin scale of artificial factors (water use increasing and the bottom surface changing). In 1919-1933, the trend of runoff change is relatively significant, passed 0.10 of the significant level test, showing a downward trend. In 1934-1989 and 1990-2016, the trends of runoff changed are more smoothly. [ABSTRACT FROM AUTHOR]