海岛淡水透镜体形成及倒锥演变规律分析

Formation of freshwater lens in islands and evolution rules of the upconing

本文采用自制的室内物理模型,对海岛淡水透镜体的演变过程进行了模拟实验。为了避免电导率测定值受自然因素等的影响,实验采用观测孔测得的电导率值与海水电导率值的相对值作为刻画淡水透镜体形状的手段。实验结果表明:降雨强度越大,则降雨入渗量越大、淡水透镜体越厚,透镜体厚度最终稳定在22cm;开采强度越大,透镜体越易被击穿。这一结果不仅为海岛淡水资源的开发利用提供了理论基础,同时为国内外开展相关研究提供参考。

Through using the self-made physical model in laboratory the evolution of the freshwater lens in islands is simulated. In order to avoid the affection of natural factors to the conductivity value, the relative values obtained by the conductivity value from the observation holes and the seawater is used as the means to character the shape of freshwater lens in the experiment. The results show that the greater rainfall intensity the greater the volume of the rainfall infiltration, and finally the thickness of the lens stabilize at 22cm; the greater the exploitation rate the easier the lens to break down. The experiment results could provide the theoretical basis for island freshwater resource development and utilization, and it could provide the reference for the related research at home and abroad.