Prediction of Groundwater Inundation Based on GMS - With Example of Inundation-Affected Areas in Upstream of Dadingzishan Reservoir

Abstract

To deal with specific groundwater inundation problems such as large-scale study area, complicated recharge and discharge terms and special aquifer structures, there may be some inappropriateness or limitation in accuracy, range or flexibility when using traditional methods, including the experience analysis method, water balance method and the principle of Hydrodynamics. However, the numerical modeling method, which can break the constraints of space, time and accuracy, can conquer the problems above, even though there have been very few utilizations of the numerical simulation method on inundation prediction. With the real case of the inundation-affected areas located in the upstream of the Dadingzishan Reservoir, firstly, it analyzed and listed out the major controlling elements, including fundamental controlling elements (location and range, topography, land utilization, hydrology and meteorology, reservoir operation, and human activities, etc.) and key controlling elements (structures, boundaries, functions, input features of the aquifer) in this paper. Secondly, a hydrogeological conceptual model and numerical simulation model had been established to serve for the prediction of inundation range and degree. After the identification and verification of the model and calculating the future recharge and discharge, the fully qualified model had made a forecasting of the inundation situations in 2015 and 2020. This paper is expected to provide practical example and method application for the relative reservoir inundation research.