1. Dep. of Environmental Engineering and Earth Sciences, School of Civil and Environmental Engineering and Earth Sciences Clemson Univ. Clemson SC 29634 USA
2. Dep. of Hydraulic Engineering, State Key Laboratory of Hydroscience and Engineering Tsinghua Univ. Beijing China
3. Changjiang Institute of Survey, Planning, Design and Research Wuhan China
4. Dep. of Agricultural Engineering Gyeongsang National Univ. Jinju South Korea
5. Dep. of Plants, Soils and Climate Utah State Univ. Logan UT 84322 USA
6. Saint Loup Research Institute 7 rue des chênes Saint Loup Lamairé 79600 France