1. Tianjin Key Laboratory of Water Environment and Resources; Tianjin Normal University; No. 393 Binshuixi Road; Xiqing District; Tianjin; 300387; China
2. Department of Statistics; Tianjin University of Finance and Economics; No. 25 Zhujiang Road; Hexi District; Tianjin; 300222; China
3. Department of Accounting; Tianjin University of Finance and Economics; No. 25 Zhujiang Road; Hexi District; Tianjin; 300222; China
4. College of Mathematical Science; Tianjin Normal University; No. 393 Binshuixi Road; Xiqing District; Tianjin; 300387; China
5. Department of Environmental Engineering, College of Science and Engineering; Jinan University; No. 601 West Huangpuda Street; Guangzhou; 510632; China
6. Department of Hydrology and Water Resources; The University of Arizona; John Harshbarger Building, 1133 E. North Campus Drive Tucson; AZ; 85721; USA