1. Professor, Institute of Hydropower and Hydroinformatics, Dalian Univ. of Technology, Dalian 116024, China (corresponding author).
2. M.S. Student, Institute of Hydropower and Hydroinformatics, Dalian Univ. of Technology, Dalian 116024, China.
3. Dept. of Civil Engineering and Center for Environmental Resource Management, Univ. of Texas at El Paso, EL Paso, TX 79968.
4. Centre for Environmental Policy, Imperial College London, London SW7 2AZ, U.K.