1. College of Management Science, Chengdu University of Technology, Chengdu, China
2. Sichuan Water Resources Dispatching Management Center, Chengdu, China
3. College of Mathematics and Physics, Chengdu University of Technology, Chengdu, China
4. School of statistics, Southwestern University of Finance and Economics, Chengdu, China
5. Geomathematics Key Lab of Sichuan Province, Chengdu University of Technology, Chengdu, China