Sloping coastal aquifers are widely distributed in nature. In this study, improved analytical solutions for describing the saltwater-freshwater interface and the location of toe of saltwater wedge for seawater intrusion in sloping unconfined aquifers are obtained based on the new Dupuit-Forchheimer approximation that takes into account the vertical velocity “Modified” better reflects the alteration of the method, and “accounts for” is more concise than “takes into account”. It is found that the location of saltwater-freshwater interface under constant-flux boundary is related to the tilt angle of aquifer bottom plate, and the tilt angle of the aquifer bottom inhibits intrusion degree of seawater intrusion in aquifers. The improved analytical method considering the vertical velocity is more accurate and closer to the experimental results. The Root Mean Square Error (RMSE) and Mean Absolute Error (MAE) of improved analytical method are lower than those of traditional analytical method by 0.323 cm and 0.133 cm. The saltwater–freshwater interface predicted by the improved method fits better with experimental observations, and the lengths of the saltwater wedges are more comparable. Therefore, the vertical velocity cannot be neglected. The analytical solution obtained in this study provides a scientific basis for predicting seawater intrusion in sloping coastal aquifers and for effective groundwater management.
Analytical Solution for Seawater Intrusion in Coastal Sloping Aquifers Considering Vertical Velocity
Environ Sci Eng
International Conference on Advances in Energy Resources and Environment Engineering ; 2023 ; Sanya, China December 29, 2023 - December 31, 2023
Advances in Watersheds Water Pollution and Ecological Restoration ; Chapter : 24 ; 237-245
2025-04-16
9 pages
Article/Chapter (Book)
Electronic Resource
English
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