1. College of Water Resources and Engineering, Taiyuan Univ. of TechnologyTaiyuan030024China
2. First Hydrogeology and Engineering Geology Team of Shanxi ProvinceTaiyuan030024China
3. Taigu Water Balance Experimental FieldBureau of Hydrology and Water Resources Survey of Shanxi ProvinceTaigu030800China
4. Dep. of Earth SciencesUniv. of the Western CapePrivate Bag X17, BellvilleCape Town7535South Africa