珊瑚岛淡水透镜体的模拟与开发  

Simulation and Exploitation of the Freshwater Lens in Coral Island

作　　者：周从直[1] 谯华[1] 杜蓉[2] 

机构地区：[1]后勤工程学院国防建筑规划与环境工程系,重庆401311 [2]西北矿冶研究院,甘肃白银730900

出　　处：《后勤工程学院学报》2016年第3期1-10,共10页Journal of Logistical Engineering University

基　　金：国家自然科学基金项目(40576050)

摘　　要：珊瑚岛淡水透镜体赋存于珊瑚岛内,承托于海水之上,是珊瑚岛上宝贵的淡水资源。为充分开发利用和保护淡水透镜体,需对透镜体的演变过程进行模拟,了解其动力学过程,制定正确的开采与保护方法。分析了淡水透镜体的形成机理,采用变密度流构建了淡水透镜体三维数学模型,计算了永兴岛淡水透镜体的水头和Cl^(-1)质量浓度分布,数值模拟了开采量对淡水透镜体厚度和贮量的影响,提出了淡水透镜体的开采策略和保护措施。研究表明:以Cl^(-1)质量浓度600 mg/L等值面为淡水透镜体的包络面,永兴岛淡水透镜体最大厚度为15 m,中央过渡带厚度约为6.5 m,常年可持续开采量推荐为24×104m3/a。研究成果可用于制定淡水透镜体的开采策略和管理保护措施,也可用于预测人工吹填珊瑚岛淡水透镜体的动力学过程。The freshwater lens,lying in coral island and above sea water inside,is the invaluable freshwater resource.In order to exploit and protect freshwater lens,it is necessary to simulate the evolution procedure of the freshwater lens,understand the dynamics processes and work out correct exploitation and protection methods.In this paper,the formation mechanism of the freshwater lens was analyzed,three-dimension mathematical model was constructed by density depended flow.Taking the Yongxing island as an ample,the distribution of the water head and Cl^-1 mass concentration was calculated,the impact of exploitation yield on freshwater lens＇ thickness and storage was investigated by numerical simulation,and the exploitation strategy and protection measure of the freshwater lens were put forward.The simulation results show that the maximum thickness of freshwater lens is 15 m,the middle transition belt is about 6.5 m and the perennial recommended production volume is 24×10^4 m^3/a,with the contour plane of 600 mg/L Cl^-1 as freshwater lens envelope surface.The results of the research may be used not only in working-out exploitation strategy of the lens and management and as well as protection measure,but also in predicting the dynamic process of freshwater lens in the manual dredging-filled islands.

关 键 词：珊瑚岛 淡水透镜体 数值模拟 可持续开采量 

分 类 号：P641.2[天文地球—地质矿产勘探]