1. Dept. of Water Resources and Environment, Sun Yat-sen Univ., Guangzhou 510275, China; and Key Laboratory of Water Cycle and Water Security in Southern China of Guangdong High Education Institute, Sun Yat-sen Univ., Guangzhou 510275, China (corresponding author).
2. Dept. of Geography and Resource Management, Chinese Univ. of Hong Kong, Hong Kong, China; and Centre of Strategic Environmental Assessment for China, Chinese Univ. of Hong Kong, Hong Kong, China.
3. Dept. of Water Resources and Environment, Sun Yat-sen Univ., Guangzhou 510275, China; and Key Laboratory of Water Cycle and Water Security in Southern China of Guangdong High Education Institute, Sun Yat-sen Univ., Guangzhou 510275, China.