1. College of Mechanics and Materials; Hohai University; Nanjing China
2. Department of Geological Sciences; University of Alabama; Tuscaloosa Alabama USA
3. Department of Mathematics; University of Otago; Dunedin New Zealand
4. Division of Hydrologic Sciences; Desert Research Institute; Las Vegas Nevada USA
5. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering; Hohai University; Nanjing China
6. Department of Geosciences; Western Michigan University; Kalamazoo Michigan USA