Abstract:

To study the tempo-spatial response of groundwater system to different water resources exploration and utilization patterns in northern cities where groundwater is overdrafted, groundwater numerical models under three schemes of concentrated exploitation, exploitation reduction step-by-step and joint operation of generalized surface water and groundwater were constructed. The variations of regional groundwater level and water balance were studied using numerical models. Comparing the simulated results of regional groundwater level and water balance with base-line one, it shows that the regional groundwater level rises slowly and the groundwater level in the centre of the well field drops greatly which can be up to 9 m under the concentrated exploitation scheme. It is even worse under the exploitation reduction step-by-step scheme as a result of the reduction of aquifer storage from surface water and lateral recharge. Groundwater level at the centre of the well field in the north of Jining City drops more than 12 m, and up to 8 m in the south. It is only under the joint operation of surface water and groundwater regional groundwater level rises apparently with some parts ascending 4 m, whilst groundwater level of the depression cone only drops 4 m, which can make the regional groundwater level recovers.

Key words: groundwater resources, groundwater system, numerical model, tempo-spatially responses, generalized surface water, groundwater