Southwestern Research Institute of Water Transport Engineering Chongqing Jiaotong University Chongqing 400016 China;
State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai University Nanjing 210098 China;
Key Laboratory of Virtual Geographic Environment Ministry of Education Nanjing Normal University Nanjing 210097 China;
Chongqing Education College Chongqing 400067 China;