首页|Evaluating the Effect of Subsurface Structures on Freshwater Lenses in Coral Reefs
Evaluating the Effect of Subsurface Structures on Freshwater Lenses in Coral Reefs
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Freshwater groundwater lenses(FGLs)serve as an important water resource for remote coral atoll islands,and different hydrogeological data of the islands determine the growth and decay of the FGLs.This study conducted a three-dimensional(3D)numerical model using hydrogeological data from a reclaimed island to evaluate the effects of different locations and sizes of sub-surface structures on the formation and macroscale stability of the FGLs.The results revealed that freshwater formation begins ear-lier than the base model when the subsurface structures are present.Constructing underground structures in Pleistocene aquifers leads to a significant increase in freshwater volume with the enlargement of the structure's size.When these structures are built within Holocene aquifers,as the burial site moves from the edge towards the center of the area,the maximum freshwater volume decreases slightly,with the largest difference being approximately 4×105 m3.When the structure constructed in the Holocene aquifer and its central axis does not coincide with the center of the simulated area,the maximum thickness of the FGLs will be shifted from the center of the simulated area to 20-25 m on the side of the structure.When constructed in the Pleistocene aquifer,the thickness of the FGLs increases.This study provides methodology for planning and management of reclaimed lands for water sustainability in the future in coastal areas.
freshwater lensnumerical simulationYongshu Islandsubsurface structuresformation processsteady-state water volume
ZHANG Zhenchao、WANG Han、GUO Xiujun
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Key Laboratory of Marine Environmental Science and Ecology,Ministry of Education,Qingdao 266100,China
Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering,Qingdao 266100,China
Ocean University of China,Sanya Oceanographic Institution,Sanya 572000,China
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