Groundwater simulation in the Yangtze River basin with a coupled climate-hydrologic model

The effect of climate change on groundwater as one important research content of IPCC, IUGC, WMO and IAHS is well worth our research. A coupled climate-hydrologic model is developed and used to simulate the interaction of climate and hydrology components over Yangtze River basin. The coupled climate-hydrology model has various schemes handling the transfer of various variables between the coarse grid-climate model and the finer-grid hydrologic model. The hydrologic model system with a grid resolution of 20 km is forced with the global 6-h gridded NCEP/NCAR reanalysis data for simulations. The parameters, boundary conditions, and initial conditions are determined based on spatial, climatic and hydrogeologic multivariate data information (i.e., satellites, remote sensing, geological survey). The results show that the simulation captures the spatial patterns of soil moisture, and groundwater depth and recharge. Because of the lack of detailed spatial hydrogeologic parameters to a great extent, discrepancy in simulated values occurs for some variables. The field research and test should be carried out and basin database should be constructed to improve the simulation capacity of the model.