Discussing On Groundwater Flow Near Partially Penetrating River

The interaction between the groundwater and river water is a common natural phenomenon, and it also is the important part of land water cycle. River water and groundwater is a close connection unity, there are not only water exchanges but also solute and contaminant transport exist between them. With the large scale groundwater exploitation in water source site adjacent to river, the influence of the river to groundwater system is more prominent, and the interaction mechanism of them is more complicated. So, correctly analysis the connection of river water and groundwater is important to the scientific simplification of river when building groundwater flow model.Aiming at the problem that Rivers is always treated as full penetrating one in analytic method, the numerical model of partial penetrating river is constructed, and the groundwater flow near partial penetrating river is simulated. The impact on unit discharge and water head is discussed, The formulas for calculating unit discharge and water head have been obtained, The results show that the groundwater dynamic state varies with the river integrity.In dualistic structure model, the thickness and permeability of upper layer clay are considered. The numerical simulation shows that the upper semipervious formation acts as relatively impervious layer, and permeability decrease with the increasing or thickness of the upper semipervious formation; when river penetrating the back plane of upper semipervious formation, the groundwater table of research side would elevate abruptly, and when considering the effect of backwater time the elevation of groundwater table is bigger than that of river doesn't penetrate the upper semipervious formationReservoir immersion is an important content of reservoir investigation and appraisement, and it also is one of five engineering geology problems of reservoir engineering. In this paper, based on the comparison of Reservoir immersion prediction method, and to the Shitoukoumen Reservoir storage increment engineering in Jiling province Changchun city, the typical section is selected; then considering the extent of the river penetrating the aquifer and effect of backwater time, the banked-up water levels of groundwater is researched after Reservoir storage increment, and reservoir immersion is predicted.