Combined Effect of Tides and Varying Inland Groundwater Input on Flow and Salinity Distribution in Unconfined Coastal Aquifers

Woei Keong Kuan; Pei Xin; Guangqiu Jin; Clare E. Robinson; Badin Gibbes; Ling Li

doi:10.1029/2018wr024492

journal article Nov 01, 2019

Combined Effect of Tides and Varying Inland Groundwater Input on Flow and Salinity Distribution in Unconfined Coastal Aquifers

Woei Keong Kuan

Water Resources Research Vol. 55 No. 11 pp. 8864-8880 · American Geophysical Union (AGU)

View at Publisher Save 10.1029/2018wr024492

Abstract

AbstractTides and seasonally varying inland freshwater input, with different fluctuation periods, are important factors affecting flow and salt transport in coastal unconfined aquifers. These processes affect submarine groundwater discharge (SGD) and associated chemical transport to the sea. While the individual effects of these forcings have previously been studied, here we conducted physical experiments and numerical simulations to evaluate the interactions between varying inland freshwater input and tidal oscillations. Varying inland freshwater input was shown to induce significant water exchange across the aquifer‐sea interface as the saltwater wedge shifted landward and seaward over the fluctuation cycle. Tidal oscillations led to seawater circulations through the intertidal zone that also enhanced the density‐driven circulation, resulting in a significant increase in the total SGD. The combination of the tide and varying inland freshwater input, however, decreased the SGD components driven by the separate forcings (e.g., tides and density). Tides restricted the landward and seaward movement of the saltwater wedge in response to the varying inland freshwater input in addition to reducing the time delay between the varying freshwater input signal and landward‐seaward movement in the saltwater wedge interface. This study revealed the nonlinear interaction between tidal fluctuations and varying inland freshwater input will help to improve our understanding of SGD, seawater intrusion, and chemical transport in coastal unconfined aquifers.

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Details

Published: Nov 01, 2019
Vol/Issue: 55(11)
Pages: 8864-8880
License: View

Authors

W

Woei Keong Kuan

Faculty of Civil Engineering Universiti Teknologi MARA, Cawangan Pulau Pinang Permatang Pauh Malaysia

P

Pei Xin

State Key Laboratory of Hydrology‐Water Resources and Hydraulic Engineering Hohai University Nanjing China

G

Guangqiu Jin

State Key Laboratory of Hydrology‐Water Resources and Hydraulic Engineering Hohai University Nanjing China

C

Clare E. Robinson

Department of Civil and Environmental Engineering The University of Western Ontario London Ontario Canada

B

Badin Gibbes

School of Civil Engineering The University of Queensland Brisbane Queensland Australia

L

Ling Li

School of Engineering Westlake University Hangzhou China

Funding

National Natural Science Foundation of China-Yunnan Joint Fund Award: 51579077

Cite This Article

Woei Keong Kuan, Pei Xin, Guangqiu Jin, et al. (2019). Combined Effect of Tides and Varying Inland Groundwater Input on Flow and Salinity Distribution in Unconfined Coastal Aquifers. Water Resources Research, 55(11), 8864-8880. https://doi.org/10.1029/2018wr024492

Combined Effect of Tides and Varying Inland Groundwater Input on Flow and Salinity Distribution in Unconfined Coastal Aquifers

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