Numerical simulations of steady-state salinity distribution and submarine groundwater discharges in homogeneous anisotropic coastal aquifers
Numerical simulations of steady-state salinity distribution and submarine groundwater discharges in homogeneous anisotropic coastal aquifers
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均质各向异性沿海含水层稳态盐度分布和海底地下水排放的数值模拟
DOI：
10.1016/j.advwatres.2014.10.009
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发表时间：
2014-12
影响因子：
4.7
通讯作者：
Xiaowei Jiang
中科院分区：
文献类型：
--
作者：
Hailong Li;Li Wan;Xusheng Wang;Xiaowei Jiang
Steady-state seawater–groundwater interactions are simulated for homogeneous, anisotropic unconfined coastal aquifers using the two-dimensional numerical model MARUN. The spatial salinity distributions are approximately independent of the horizontal hydraulic conductivity K x when α L K x K z⩾ 10− 6 m 2/s. Here K z is vertical hydraulic conductivity and α L is longitudinal dispersivity. Both the fresh groundwater discharge rate Q f and seawater recirculation rate Q s depend linearly on K x. These conclusions are validated by a semi-analytical method. The increase of anisotropy ratio pushes the saltwater wedge interface seaward and reduces Q s. The increment of the longitudinal/transverse dispersivity ratio with fixed longitudinal dispersivity decreases the slope of isosalines and Q s. When the seabed slope angle θ increases from 0.01 to π/2, the freshwater–seawater interface moves landward. The increment of θ increases Q s slightly when θ< π/4 and reduces Q s when θ> π/4. The inland recharge rate Q f is independent of the seabed slope.
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