Difference and causes of runoff in different sections above Tangnaihai in the source region of the Yellow River
Based on the hydrological date of Tangnaihai Basin above the source region of the Yellow River during 1956-2019,the basin was divided into three sections:Jimai-above,Jimai-Maqu and Maqu-Tangnaihai,the change process of runoff in different sections was analyzed.The mutation test was made using Mann-Kendall methord.the time series was segmented by these mutation years,and the linear rela-tionship between the cumulative runoff,cumulative precipitation,cumulative evaporation and time series were obtained.and the contribution rate was quantitatively analyzed.The results show that:(1)the time distribution and space distribution of the current production appear uniform in the whole source plane.(2)The runoff in the source region of the Yellow River decreased after the 1990s,and the runoff increased significantly after 2004.From the 1990's to the early 2000s,the effect of evaporation caused by tempera-ture rise has a significant effect on the decrease of runoff.After 2004,the increase of precipitation has a significant effect on the increase of runoff,and there are different intervals and time series between the changes of precipitation,evaporation and runoff.
the source region of Yellow Riverrunoffcontribution ratesprecipitationevaporation
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