کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6410600 | 1629925 | 2015 | 9 صفحه PDF | دانلود رایگان |
- Correct Dupuit interface models (DIMs) to account for submarine outflow gap.
- Correct DIMs with dispersion-adjusted density ratio modified for unconfined flow.
- Improved prediction of interface toe by â¼20% in the generic aquifer cases studied.
- Applications to 2 Mediterranean aquifers show improved accuracy by â¼15% and 300%.
SummaryInterface flow models that use the Dupuit-Forchheimer (DF) approximation for assessing the freshwater lens and the seawater intrusion in coastal aquifers lack representation of the gap through which fresh groundwater discharges to the sea. In these models, the interface outcrops unrealistically at the same point as the free surface, is too shallow and intersects the aquifer base too far inland, thus overestimating an intruding seawater front. To correct this shortcoming of DF-type interface solutions for unconfined aquifers, we here adapt the outflow gap estimate of an analytical 2-D interface solution for infinitely thick aquifers to fit the 50%-salinity contour of variable-density solutions for finite-depth aquifers. We further improve the accuracy of the interface toe location predicted with depth-integrated DF interface solutions by â¼20% (relative to the 50%-salinity contour of variable-density solutions) by combining the outflow-gap adjusted aquifer depth at the sea with a transverse-dispersion adjusted density ratio (Pool and Carrera, 2011), appropriately modified for unconfined flow. The effectiveness of the combined correction is exemplified for two regional Mediterranean aquifers, the Israel Coastal and Nile Delta aquifers.
Journal: Journal of Hydrology - Volume 525, June 2015, Pages 277-285