Improvements of a distributed hydrology model DHSVM and its climatological-hydrological Off-line simulational experiments

摘要

The advanced distributed hydrology-soil-vegetation model DHSVM, developed by Wigmosta et al.(1994)is introduced from US Pacific Northwest National Laboratory. To apply DHSVM in China for the first time some improvements have been made in terms of the basin characteristics: 1) to change evapotranspiration model, using the improved Penman-Monteith approach in place of the original one; 2)to change the model structure, inserting datasets from 4 stations to grid cells for each river basin, instead of datasets from one or two stations; 3)to develop new hydrology, vegetation and soil parameterization schemes for improving the simulated results, whit focus on calculation and adjustment of 11 parameterization, such as soil porosityψ, field capacityθ_fc, leaf area index LAI, stochastic resistanceγ_s, among the total 33 parameters.