雷州半岛降雨历程影响地下水动态变化的特征

Characteristics of the influence of rainfall on the variation in groundwater level in the Leizhou Peninsula, Guangdong

通过对雷州半岛逐日的降水量和地下水位进行连续测量,分析研究了该区地下水位动态的变化规律,结果表明:(1)雷州半岛地下水位存在年周期的变化规律,水位上升期大约在6～10月的雨季,其余时间为水位下降期;(2)在地下水补给区,地下水位上升期间地下水位累积增幅与逐旬累积雨量有明显的正相关关系;在水位下降期,地下水位的下降速度与地下水位也呈正相关关系;(3)在目前的开采条件下,丰水年的降雨对地下水资源进行有效的补给和恢复。

Through field observations of daily rainfall and groundwater level, the variation in groundwater level in the Leizhou Peninsula is examined. The results show that: (1) there is an anual periodic variation in groundwater level in the Leizhou Peninsula, with an ascending period from June to October, lasting for 90～100 days, and a descending period during the reminding months; (2) in the recharge area, the variation in the groundwater level has a close relation with rainfall, that is, during the ascending period there is an obviously positively-interrelationship between the accumulated ascending-range of the groundwater level and the accumulated rainfall, and during the dry reason with less rainfall, the descending speed of the groundwater level is obviously positively-interrelated with the groundwater level itself; (3) under the present pumping condition, in rainy years the recharge of groundwater from rainfall may exceed the discharge and exploitation of the groundwater. As a result, groundwater resources in the area can effectively be recharged and recovered.