国际科技合作项目2010DFA92720;国家自然科学基金41201460;61375002;41271367;水利部公益性行业科研专项201201092Foundation support The International Science and Technology Cooperation Program of China No2.010DFA92720;TheNational Natural ScienceFoundationofChina Nos4.1201460;61375002;41271367;The Special Funds for Scientific Research on Public Causes of theMinistry of Water Resources of China.201201092