1. State Key Laboratory of Hydroscience and Hydraulic Engineering, Dept. of Hydraulic Engineering, Tsinghua Univ., Beijing 100084, China.
2. Associate Professor, State Key Laboratory of Hydroscience and Hydraulic Engineering, Dept. of Hydraulic Engineering, Tsinghua Univ., Beijing 100084, China (corresponding author).
3. National Institute of Natural Hazards, Ministry of Emergency Management of China (NINH, MEMC), Beijing 100085, China.