三江平原建三江地区地下水激发补给再计算

Recomputation of Groundwater Stimulated Recharge in Jiansanjiang Area of Sangjiang Plain

三江平原建三江地区地下水激发补给,虽在地下水资源评价中很少考虑,但已有计算,并且在近10年来开采实际中起到很大作用。为此笔者不仅进行"再分析",而且进行"再计算"。以实际开采地下水的动态资料,进行地下水平衡计算。计算结果表明,典型农场如创业农场已获得1.8倍原评价水资源的激发补给;全分局现地下平均水位45.67 m,已获得激发补给4.99×108m3;若继续发展打井种稻,使平均地下水位降至40.00 m时,全分局可获得激发补给13.16×108m3,是原评价资源量的1.2倍,接近原计算激发补给量。可满足近远期发展水田对资源的要求,而地下水还难以消除承压。

Although the groundwater stimulated recharge in Jiansanjiang Area of Sanjiang Plain was not taken into account in ever-made evaluations of groundwater resource, the computation and the preliminary analysis has been made . By researching mining practice of groundwater in recent years, the importance and status of groundwater stimulated recharge made the re-analysis and recomputation in this paper. During the course of recomputation, a computation reflecting the balance between groundwater supply and mining was carried out, the result shows that the groundwater stimulated recharge, in some typical farms such as Chuangye, has reached 1.8 times of originally-evaluated groundwater resource quantity. Computing by direct ratio function between water supplememtal recharge and water level differences, the present average water level all around the general bureau is 45.67m, thus, a conclusion come into being： in the future, the groundwater mining will be enhanced with the development of rice planting, which will caused the decline of water level, when the water level decline to 40. 00m, not only will groundwater be fully recharged in all the farms of the general bureau but also the groundwater reserve will reach more than 13 × 10^8 m^2 which is 1.2 times of the originally-evaluated groundwater reserve in all the farms of the general bureau, which can meet rice planting development＇s demand for water in the far and near future.