兰村水源地地下水可采资源量再探讨

Approaching the Recoverable Resources of Groundwater in Lancun Water Source,Taiyuan

本文针对最近几年兰村水源地地下水水位持续大幅度下降的现实，将１９５７年兰村水厂建成至今近４０年的开采历史，视为一个极大排水量、极长时间的特大型抽水试验，利用地下水位动态曲线分析法和开采试验抽水法两种方法，对兰村水源地地下水可采资源量进行了再探讨，求得了一个比较符合客观实际的资源量，并提出减缓地下水位下降的建议。

Lancun water source, which is aimed at the municipal and industrial water-supply of Taiyuan city, has been mined for about 40 years.According to the data obtained from these 40 years’mining,the recoverable resources of it has been approached in this paper from two aspects.First,from the relatiom between the mining and the fluctuation of water table,a miningrecharge balance period (1969～1986) has been found when the average mining is 234,600 m 3/d,the decline of water table is 0.28m a year on an average. Secondly,from a simplified water balance equation put forward by the writers,an average recharge has been derived to be 191,000m 3/d during the miningrecharge balance period.Based on the about information,the writers hold that the recoverable resources of groundwater in Lancun water source would approximately be 220,000～230,000m 3/d.Some suggestions have also been made on retarding the decline of water table by the writers as the water source has entered an overmining stage after 1986.