Study on Encounter of Runoff Abundance and Scarcity Between Source Area and Receiving Area of the Central Yunnan Irrigation Project and the Hydrological Drought
The water source area of the Central Yunnan Irrigation Project is the Hutiaoxia section of the Jinshajiang River,and the receiving area is the Central Yunnan Plateau.Studying the flow richness and drought encounter and hydro-logical drought trends between the two can provide theoretical guidance for the water resources dispatch of the Central Yunnan Irrigation Project and the regional water and drought disaster defense.By describing the independence structure of the runoff series with multivariate Copula functions,the theory of run-length is used to analyze the hydrological drought duration,intensity,and recurrence based on the standardized runoff index in the water source area and the receiv-ing area.The flow richness and drought encounter and its impact on hydrological drought in the water source area and the receiving area of the Central Yunnan Irrigation Project is evaluated quantitatively.The results show that the standardized runoff index in the water source area changed little after the project,and the hydrological drought events recognized were relatively stable in duration,intensity,and recurrence;The standardized runoff index in the receiving area changed great-ly,and the recognized hydrological drought events were shorter in duration,weaker in intensity,and longer in recur-rence,especially severe droughts and multi-year droughts.This shows that the implementation of the Central Yunnan Ir-rigation Project can effectively increase the water resources in the receiving area and significantly improve the water and drought disaster defense in the receiving area.
Central Yunnan Irrigation Projectstandardized runoff indexhydrological droughtrichness and drought encounterCopula function
万方数据
维普
