国家国际科技合作专项项目2014DFG72150;国家自然基金面上项目51279166;水资源与水电工程科学国家重点实验室开放基金2011B083.National International Scientific and Technological Cooperation Project,No.2014DFG72150;National Natural Science Foundation of China,No.51279166;State Key Laboratory of Water Resources and Hydropower Engineering Science Open Fund,No.2011B083.