562 / 2024-07-31 20:06:10

Construction and Application of Rainfall Retaining Capacity Model of Small Reservoirs within Ungauged Region

small reservoirs; rainfall retaining capacity; ungauged region; iterative trial calculations; Hunan Province

Subtheme 1: Water-related Hazard and Risk Reduction > Topic 1: Water Hazard Under Climate Change

To realize the flood risk warning of small reservoirs within ungauged region, the Rainfall Retaining Capacity Model and its parameter schemes have been developed in this study. An iterative trial solution method considering potential rainfall for the constructed model has been proposed for efficient computation. The rainfall retaining capacity of 32 pilot small reservoirs located in ungauged basins of Hunan Province was calculated starting from August 21, 2023. In addition, a continuous calculation was carried out from August 1 to September 30, 2023 using the proposed method for Heping reservoir. The results show that the flood risk of the pilot small reservoirs calculated is reasonably related to the rainfall distribution, supporting flood risk visualization for small reservoirs within the rain-affected region. Furthermore, the impact of the antecedent precipitation on rainfall retaining capacity can also be dynamically quantified in real time, which provides reference for the continuous management of flood risks of small reservoirs.