Characteristics of Runoff Changes at Different Time Scales in the Water Source Area of the Niulan River Dianchi Lake Replenishment Project
In order to carry out water resource scheduling,allocation,watershed water safety management,and re-gional flood control and drought relief work in water replenishment projects,fully leveraging the engineering benefits,based on the representative station master's series of hydrological data from the water source area of the Niulan River Di-anchi Lake Water Replenishment Project,the characteristics of runoff changes at different time scales in the water source area of the Niulan River Dianchi Lake replenishment project were analyzed using various methods such as concentration,non-uniformity coefficient,Hurst coefficient,M-K trend test,sliding T-test.The results show that the inter-annual vari-ation of runoff at different time scales in the water source area is significant,with a clear period of high to low runoff;E-volution of distribution towards uniformity and normalization within the year;The minimum 1 d and 7 d runoff showed a significant upward trend,while the other 7 runoff trends showed no significant changes and all experienced sudden chan-ges;After five sudden changes in runoff indicators,including the year,high water period,and extreme maximum,the runoff decreased significantly,while the four sudden changes in runoff indicators,including low water period and extreme minimum,showed an increasing trend;After the sudden change in annual runoff,the water inflow from August to Octo-ber decreased significantly;It is expected that extreme low water events will not occur in the water source area of the wa-ter replenishment project in the future,but the total inflow may further decline.
changes of runoffuneven coefficientconcentrationHurst coefficientmutation analysisdifferent time scales
NETL
NSTL
万方数据
维普
