Evaluation of a traditional method for peak flow discharge estimation for floods in the Wenchuan Earthquake area, Sichuan Province, China Evaluation of a traditional method for peak flow discharge estimation for floods in the Wenchuan Earthquake area, Sichuan Province, China

最小化 最大化

Vol16 No.3: 641-656

Title】Evaluation of a traditional method for peak flow discharge estimation for floods in the Wenchuan Earthquake area, Sichuan Province, China

Author】GUO Xiao-jun1,2; CUI Peng1,2*; LI Yong1; LIU Jin-feng1; GE Yong-gang1,2; WANG Ci-de3

Addresses】1 Key Laboratory of Mountain Surface Process and Hazards/Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China; 2 Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing 100101, China; 3 Aba Hydrological and Water Resources Survey Bureau of Sichuan Province, Wenchuan 623000, China

Corresponding author】CUI Peng

Citation】Guo XJ, Cui P, Li Y, et al. (2019) Evaluation of a traditional method for peak flow discharge estimation for floods in the Wenchuan Earthquake area, Sichuan Province, China. Journal of Mountain Science 16(3). https://doi.org/10.1007/s11629-018-4983-5

DOI】https://doi.org/10.1007/s11629-018-4983-5

Abstract】Peak discharge of flood in small mountainous watershed is usually calculated using the "Rainstorm–runoff calculation method in small watersheds in Sichuan Province" (RRM). This study evaluated the RRM calculation using real-time monitored rainfall and hydrologic data from a small watershed in the Wenchuan Earthquake area of Sichuan Province, China. The results indicated that the discharge values given by the RRM are commonly overestimating the measured discharge. The overestimation rate was discussed and empirical equations were proposed for improving RRM estimations, based on the relationship between calculated and measured discharge values at different watershed scales (2, 30, and 40 km2), under different rainfall probabilities (0.97–0.5, 0.5–0.2, and 0.2–0.002), and for different rainfall durations (0–6, 6–24, and >24 h). The results of this study help contribute to the understanding of water floods formation and help provide more accurate estimations of peak flow discharge in small watersheds in the Wenchuan Earthquake area.

Keywords】Rainfall; Runoff yield; Influx; Peak discharge; Wenchuan Earthquake area