Numerical simulations of steady-state salinity distribution and submarine groundwater discharges in homogeneous anisotropic coastal aquifers

作者：Qu Wenjing; Li Hailong^*; Wan Li; Wang Xusheng; Jiang Xiaowei

来源：Advances in Water Resources, 2014, 74: 318-328.

DOI：10.1016/j.advwatres.2014.10.009

• Submarine groundwater discharge
• Salinity distribution
• Slope
• Density difference
• Coastal aquifers
• Numerical simulations of steady-state model

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 alpha(L) root KxKz >= 10 (6) m(2)/s. Here K-z is vertical hydraulic conductivity and alpha(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 theta increases from 0.01 to pi/2, the freshwater-seawater interface moves landward. The increment of theta increases Q(s) slightly when theta < pi/4 and reduces Q(s) when theta > pi/4. The inland recharge rate Q(f) is independent of the seabed slope.

• 出版日期2014-12
• 单位中国地质大学（北京）