1. Dep. of Civil and Environmental Engineering Univ. of California Irvine CA 92697 USA
2. Dep. of Soil Science and Engineering, Faculty of Agriculture Univ. of Maragheh Maragheh Iran
3. Forschungszentrum Jülich Institute of Bio‐ and Geosciences: Agrosphere (IBG‐3) Jülich Germany
4. Dep. of Environmental Sciences Univ. of California Riverside CA 92521 USA
5. Dep. of Earth System Science Univ. of California Irvine CA 92697 USA