How can large scale integrated surface-subsurface hydrological model be used to evaluate long term climate change impact on groundwater reserves
Estimating the impacts of climate change on groundwater represents one of the most difficult challenges faced by water resources specialists. One difficulty is that simplifying the representation of the hydrological system often leads to discrepancies in projections. This study provides an improved methodology for the estimation of the impacts of climate change on groundwater reserves, where a physically-based surface-subsurface flow model is combined with advanced climate change scenarios for the Geer basin (465 km2), Belgium. Integrated surface-subsurface flow is simulated with the finite element model HydroGeoSphere. The simultaneous solution of surface and subsurface flow equations in HydroGeoSphere, as well as the internal calculation of actual evapotranspiration improve the representation of interdependent processes like recharge, which is crucial in the context of climate change. Climate change simulations were obtained from 6 regional climate model (RCM) scenarios downscaled using a quantile mapping bias-correction technique that, rather than applying a correction only to the mean, also apply a change in the distribution of wet and dry days. For the climatic scenarios considered, the integrated flow simulations show that significant decreases are expected in the groundwater levels and in the surface water flow rates by 2080.
P.Goderniaux S.Brouyere H.J.Fowler S.Blenkinsop R.Therrien Ph.Orban A.Dassargues
Group of Hydrogeology and Environmental Geology & Aquapdle, University of Liege, Chemin des Chevreui Group of Hydrogeology and nvironmental Geology & Aquapdle, University of Liege, Chemin des Chevreuil Water Resource Systems Research Laboratory-School of Civil Engineering and Geosciences, Newcastle Un Department of Geology and Geological Engineering, Universite Laval, G1K 7P4 Quebec (Quebec), Canada Group of Hydrogeology and Environmental Geology & Aquapdle, University of Liege, Chemin des Chevreui
国际会议
武汉
英文
137-140
2009-09-20（万方平台首次上网日期，不代表论文的发表时间）