Hydrology and Earth System Sciences www.hydrol-earth-syst-sci.net 1027-5606 1607-7938 13 6 2009 10.5194/hess-13-735-2009 http://www.hydrol-earth-syst-sci.net/13/735/2009/ http://www.hydrol-earth-syst-sci.net/13/735/2009/hess-13-735-2009.html http://www.hydrol-earth-syst-sci.net/13/735/2009/hess-13-735-2009.pdf 735 747 2009-06-12 Quantifying the effect of land use and land cover changes on green water and blue water in northern part of China X. Liu L. Ren rll@hhu.edu.cn F. Yuan V. P. Singh X. Fang Z. Yu W. Zhang State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, College of Hydrology and Water<br> Resources, Hohai University, No. 1 Xikang Road, Nanjing 210098, China Dept. of Biological & Agricultural Engineering, Texas A & M University, 2117 Tamu, College Station, <br>Texas 77843-2117, USA Dept. of Geoscience, University of Nevada Las Vegas, Las Vegas, Nevada 89054, USA Changes in land use and land cover (LULC) have been occurring at an accelerated pace in northern parts of China. These changes are significantly impacting the hydrology of these parts, such as Laohahe Catchment. The hydrological effects of these changes occurring in this catchment were investigated using a semi-distributed hydrological model. The semi-distributed hydrological model was coupled with a two-source potential evaportranspiration (PET) model for simulating daily runoff. Model parameters were calibrated using hydrometeorological and LULC data for the same period. 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