Memory of past random wave conditions in submarine groundwater discharge
Xin, P., Wang, S. S. J., Robinson, C., Li, L., Wang, Y-G., & Barry, D. A. (2014) Memory of past random wave conditions in submarine groundwater discharge. Geophysical Research Letters, 41(7), pp. 2401-2410.
Submarine groundwater discharge (SGD) is an integral part of the hydrological cycle and represents an important aspect of land-ocean interactions. We used a numerical model to simulate flow and salt transport in a nearshore groundwater aquifer under varying wave conditions based on yearlong random wave data sets, including storm surge events. The results showed significant flow asymmetry with rapid response of influxes and retarded response of effluxes across the seabed to the irregular wave conditions. While a storm surge immediately intensified seawater influx to the aquifer, the subsequent return of intruded seawater to the sea, as part of an increased SGD, was gradual. Using functional data analysis, we revealed and quantified retarded, cumulative effects of past wave conditions on SGD including the fresh groundwater and recirculating seawater discharge components. The retardation was characterized well by a gamma distribution function regardless of wave conditions. The relationships between discharge rates and wave parameters were quantifiable by a regression model in a functional form independent of the actual irregular wave conditions. This statistical model provides a useful method for analyzing and predicting SGD from nearshore unconfined aquifers affected by random waves
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|Item Type:||Journal Article|
|Additional Information:||ISI Document Delivery No.: AF8RJ Times Cited: 4 Cited Reference Count: 30 Xin, Pei Wang, Shen S. J. Robinson, Clare Li, Ling Wang, You-Gan Barry, D. A. Amer geophysical union Washington|
|Keywords:||coastal aquifer, subterranean estuary, surface water and groundwater, interaction, nearshore processes, wave setup, storm surge, subterranean estuary, beach aquifers, water, ocean, zone, transport, tides, sea|
|Divisions:||Current > QUT Faculties and Divisions > Science & Engineering Faculty|
|Copyright Owner:||©2014. American Geophysical Union|
|Deposited On:||17 Nov 2015 07:04|
|Last Modified:||20 Nov 2015 00:32|
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