Large-scale Simulations of Surface Water and Groundwater with a Coupled Hydrologic Model

摘要

Research on Predictions in Ungauged Basins (PUB) is a fundamental problem and challenge in hydrology. Coupled atmospheric-hydrologic model can provide a promising tool for us on the hydrologic predictions in ungauged or less gauged basins. A newly coupled atmospheric-hydrologic model system is used to simulate the ten-year (1984 - 1993) water balance in the gauged and hypo-thetically ungauged Mississippi River (MR) basin in term of precipitation. Simulated river discharges and groundwater tables at different sub-basins are compared at daily and monthly time scales. The river discharges simulated with site precipitation data are consistent with the observed, while the results simulated without site precipitation data can also capture the general trend of flood hydrograph. The spatial patterns of variables simulated with the two cases are both reasonable. Research indicates that the coupled model system has the capability for hydrologic simulations as well for flood forecasting and water resources assessment on PUB at a certain extent.