钙质珊瑚砂水理参数测定与涵淡水能力模拟  

Measurement of hydrological parameters of coral sand and freshwater storage capacity simulation

作　　者：盛冲 张云帆[1,2,3] 李付成 许鹤华[1,2,3] SHENG Chong;ZHANG Yunfan;LI Fucheng;XU hehua(CAS Key Laboratory of Ocean and Marginal Sea Geology,South China Sea Institute of Oceanology,Guangzhou 510301,China;Innovation Academy of South China Sea Ecology and Environmental Engineering,Chinese Academy of Sciences,Guangzhou 510301,China;Southern Marine Science and Engineering Guangdong Laboratory,Guangzhou 511458,China)

机构地区：[1]中国科学院边缘海与大洋地质重点实验室(南海海洋研究所),广东广州510301 [2]中国科学院南海生态环境工程创新研究院,广东广州510301 [3]南方海洋科学与工程广东省实验室(广州),广东广州511458

出　　处：《河海大学学报（自然科学版）》2020年第6期562-568,共7页Journal of Hohai University(Natural Sciences)

基　　金：中国科学院战略性先导科技专项(XDA13010303,XDA13020405);南方海洋科学与工程广东省实验室(广州)人才团队引进重大专项(GML2019ZD0104)。

摘　　要：采用常规方法对我国南海某岛4个站位的钙质珊瑚砂样品进行实验室测定,并在此基础上利用模拟软件FEMWATER进行涵淡水能力的数值模拟。结果显示:南海表层钙质珊瑚砂以中细粒为主,其孔隙度在0.35~0.51之间,而渗透系数和给水度区域间差异较大,通常在0.023~12.73 m/d和0.01~0.10之间;岛礁淡水透镜体的厚度和资源储量与钙质珊瑚砂的水理参数间存在着密切联系,相比于其他参数,给水度对岛礁淡水透镜体的资源储量影响最大;与西沙群岛的钙质珊瑚砂相比,所测定的钙质珊瑚砂的粒度更细且颗粒多呈片状,磨圆度较差,反映了两者间的水动力条件和造礁生物方面的差异。In this study,calcareous coral sand samples from four stations on an island in the South China Sea were measured by common methods.Based on test parameters,numerical simulations of freshwater storage capacity were conducted by FEMWATER.The result indicates that the surface of the dredged calcareous coral sand in the South China Sea is mainly composed of medium and fine grains,and the porosity is mostly between 0.35 and 0.51.Meanwhile,the permeability coefficient and specific yield vary widely in different place,from 0.023-12.73 m/d and 0.01-0.10,respectively.There is a close relationship between the thickness and resource storage of fresh water lens and the hydrological parameters of calcareous coral sand.Among these parameters,the specific yield has the greatest influence on the resource storage of freshwater lens on the coral islands.Compared with the natural calcareous coral sand of Xisha Islands,the calcareous coral sand of this study is finer in size and particles are mostly flaky with poor roundness,which reflects the differences in hydrodynamic conditions and reef-building organisms.

关 键 词：钙质珊瑚砂 弥散系数 淡水透镜体 FEMWATER 涵淡水能力 

分 类 号：TU122[建筑科学—建筑理论]