Analysis of the Evolution of Hydrological Regime of the Yellow River by IHA-RVA Method
The natural fluctuation of hydrological regime is the key to maintaining the functionality and hydrological health of river ecosys-tems.Aiming at the change of hydrological regime in the Yellow River Basin caused by climate change and human activities,we selected dai-ly runoff data from Lanzhou,Longmen and Huanyuankou stations(1956-2020),the representative hydrological stations in the Yellow River Basin and used the Mann-Kendall and Pettitt test methods to comprehensively evaluate the hydrological regime in the Yellow River Basin.The Mann-Kendall and Pettitt tests were used to quantitatively evaluate the extent of hydrological changes in the Yellow River Basin by using the eco-hydrological index range of change(IHA-RVA)method.The results show that a)the abrupt changes in runoff at Lanzhou,Longmen and Huayuankou stations occurred in 1984,1987 and 1986 respectively,and that the average annual flow in the control basin at Longmen and Huayuankou stations showed a significant decrease.b)The variation of the minimum annual discharge in Lanzhou Station during 90 days is the highest,reaching 83%.The average discharge of Longmen Station in April is the highest,reaching-100%.The average increase(de-crease)rate of discharge at Huayuankou Station has the highest variation,reaching-92%.c)The overall hydrological alterations at Lanzhou,Longmen,and Huayuankou stations are 34%,37%and 51%respectively,which are all moderate.
Mann-Kendall testhydrological regimeIHA-RVAdegree of hydrological changeYellow River
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