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Physics of estuaries and coastal seas
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Coupled surface-subsurface modeling of fresh submarine groundwater discharge of an island in the Mediterranean Sea
P-P1-19
Xuan Yu* , School of Civil Engineering, Sun Yat-sen University, Guangzhou 510275, China
Zexuan Xu, Climate and Ecosystem Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
Daniel Moraetis, College of Science, Earth Science Department, Sultan Qaboos University, P.O. Box 36, Muscat 123, Oman
Nikolaos P. Nikolaidis, Department of Environmental Engineering, Technical University of Crete, University Campus, 73100 Chania, Greece
Frank W. Schwartz, School of Earth Sciences, The Ohio State University, Columbus, OH 43210, USA
Lele Shu, Department of Land, Air and Water Resources, University of California, Davis, California 95616, USA
Bingjun Liu, School of Civil Engineering, Sun Yat-sen University, Guangzhou 510275, China
Christopher Duffy, Department of Civil and Environmental Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
Presenter Email: yuxuan7@mail.sysu.edu.cn |
| Fresh submarine groundwater discharge (SGD) contributes to the physical and chemical conditions of coastal waters, but the role of coastal groundwater at regional scale is poorly described and quantified due complex surface and subsurface interactions of hydrologic processes. We used a coupled surface-subsurface hydrologic model to calculate the spatial and temporal dynamics of regional groundwater discharge at the coastlines of an island in the Mediterranean Sea. The model result suggested that 2.3x108 m3/yr of groundwater directly enters the Mediterranean Sea, amounting to 31% of river discharge. Spatially, fresh SGD varied from 1.5 m3/yr/m to 13.4x104 m3/yr/m, with a mean of 0.14x104 m3/yr/m. The local maximum was found close to river mouth with stronger hydraulic gradient and karst faults with higher permeability. Temporally, fresh SGD was impacted by episodic precipitation in a delayed and prolonged pattern depending on the topography. Overall, the results of fresh SGD demonstrated a strong dependence of local conditions and temporal hydrologic regimes, suggesting that results from large-scale estimation are problematic to apply to plot scale that typically exhibit spatial and temporal uncertain, scale-dependent properties. |
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