基金Foundation item: Supported by the State Key Laboratory of Hydraulic Engineering Simulation and Safety (Grant No. HESS-1401), the National Natural Science Foundation of China (Grant No. 51279124), the Marine Science and Technology Foundation of South China Sea Branch, State Oceanic Administration (Grant No. 1417), and the National High Technology Research and Development Program of China (Grant No. 2008AA09A401). Acknowledgement We wish to thank Prof. Bai YC for stimulating discussions and reviewers for their helpful comments that led to considerable improvements to the paper.