石家庄平原区浅层地下水位变化研究

通过对石家庄平原区浅层地下水位动态特征分析,揭示了地下水位年际及年内变化规律及其主要影响因素(开采和降水)。结果表明,石家庄平原区地下水位年际下降明显,但不同月份的地下水位年际下降速率不等,雨季前的1月-5月年际平均下降幅度比雨季及其之后的6月-12月年际平均下降幅度大。地下水位的变化主要是受到开采量和降水量的共同作用。在年际变化上,开采量增大导致地下水位下降;而降水量对地下水位的年际影响主要表现在丰水年时地下水位出现回升或下降速度减缓,枯水年时地下水位下降速度增加。在年内变化上,3月份之后开采量增加和降水量较小导致地下水位下降较快,而从6月份开始降水量增大和开采量减小导致地下水位开始回升。

Variation of Shallow Groundwater Level in Shijiazhuang Plain

Based on the analysis of the dynamic characteristics of shallow groundwater in Shijiazhuang Plain,the inter-annual and intra-annual dynamic variation law and effect elements(groundwater exploitation and precipitation) of groundwater level lowering were identified.The results showed the inter-annual falling trend of groundwater level was apparently.For each month,the inter-annual lowering rate of groundwater level was different,which showed a more rapid falling of water table during January and May than that during June and December.The variation of groundwater level was affected by the groundwater exploitation and precipitation.In terms of the inter-annual variation of groundwater level,increasing of groundwater exploitation led to the continuous lowering of groundwater level.It was showed that precipitation affected groundwater dynamic changes,according to rising or slow falling of groundwater level in wet years but rapid falling in dry years.In terms of the intra-annual variation of groundwater level,increasing of groundwater exploitation and low precipitation induced the lowering of groundwater level from March,while the increasing of precipitation and decreasing of groundwater exploitation led to the recovery of groundwater level from June.