Abstract
The construction and operation of cascade reservoirs has changed the natural hydrological cycle in the Yalong River Basin, and reduced the accuracy of hydrological forecasting. The impact of cascade reservoir operation on the runoff of the Yalong River Basin is assessed, providing a theoretical reference for the construction and joint operation of reservoirs. In this paper, eight scenarios were set up, by changing the reservoir capacity, operating location, and relative location in the case of two reservoirs. The aim of this study is to explore the impact of the capacity and location of a single reservoir on runoff processes, and the effect of the relative location in the case of joint operation of reservoirs. The results show that: (1) the reservoir has a delay and reduction effect on the flood during the flood season, and has a replenishment effect on the runoff during the dry season; (2) the impact of the reservoir on runoff processes and changes in runoff distribution during the year increases with the reservoir capacity; (3) the mitigation of flooding is more obvious at the river basin outlet control station when the reservoir is further downstream; (4) an arrangement with the smaller reservoir located upstream and the larger reservoir located downstream can maximize the benefits of the reservoirs in flood control.
Highlights
Climate change and human activities are the two major factors affecting the hydrological cycle in basin [1]
· (Vem − Vpr ) if mon ≤ mon f ld,beg or mon ≥ mon f ld,end where Vtarg is the target reservoir storage for a given day (m3 ), Vem is the storage of the reservoir when filled to the emergency spillway (m3 ), Vpr is the storage of the reservoir when filled to the principal spillway (m3 ), SW is the average soil water content in the sub-basin (m3 ), FC is the water content of the sub-basin soil at field capacity (m3 ), mon is the month of the year, mon f ld,beg is the first month of the flood season, and mon f ld,end is the last month of the flood season
Reservoirs are often designed for multiple objectives, such as hydropower generation, flood control, and water supply, and they are operated in such a way that the water can be spatially and temporally redistributed for the benefit of the water users
Summary
Climate change and human activities are the two major factors affecting the hydrological cycle in basin [1]. The CMADS has not been applied in the Yalong River Basin, and whether or not it supports research on the impacts of reservoir parameters on runoff remains a question. It is essential to carry out research on the impact of the construction and operation of the reservoir group on the runoff processes in the Yalong River Basin. Eight scenarios are discussed, by changing the capacity, location, and number of reservoirs in the Yalong River Basin, and analysing the annual maximum peak flow, peak time, and maximum three-day flood volume at the outlet control station, before and after the construction of the reservoirs. This paper provides a theoretical reference for the joint operation of reservoirs, flood forecasting, and flood control
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