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• W2024298468 abstract "A numerical investigation is presented that demonstrates the influence of tides and waves on the transport and transformation of nutrients (NO3-,NH4+,PO43-) in a homogeneous unconfined nearshore aquifer and subsequent fluxes to the sea. Simulations of an aquifer subject to semi-diurnal tides and constant waves acting on a sloping beach face were conducted using SEAWAT-2005 combined with PHT3D v2.10. Tidal amplitude (A) and wave height (Hrms) varying from 0.25 to 0.75 m and 1 to 2 m, respectively, were examined. Results show that tides and waves modify the subsurface discharge pathway of land-derived nutrients by changing the nearshore groundwater flow dynamics. More importantly, the oceanic forcing impacts nutrient cycling as it causes significant seawater exchange (along with dissolved O2 and organic matter) across the aquifer-ocean interface. Although steady wave forcing caused higher seawater influx, tides led to greater seawater-freshwater mixing in the nearshore aquifer and subsequently greater transformation of land-derived nutrients. Nutrient processing was strongly controlled by the availability and reactivity of marine dissolved organic matter (DOM) as its degradation consumed O2, released inorganic N and P, and altered redox conditions in the salt-freshwater mixing zones. For the conditions and reaction network simulated, nutrient regeneration by marine DOM degradation was independent of the seawater-freshwater mixing intensity, and therefore was greatest for the wave case due to the high seawater influx. For simulations without marine DOM considered, NO3- discharge to the sea increased by 32% for the tidal case (A = 0.5 m) compared to only 13% and 8% for the wave (Hrms = 1 m) and no oceanic forcing cases. With labile marine DOM considered, the NO3- discharge decreased by 90% relative to the land-derived flux for the tidal case (A = 0.5 m). For all simulations PO43-removal was high due to its adsorption to Fe oxide minerals. The model enables evaluation of the complex coupled physical-biogeochemical processes controlling nutrient loading to the sea via submarine groundwater discharge in dynamic coastal environments." @default.
• W2024298468 created "2016-06-24" @default.
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• W2024298468 date "2014-11-01" @default.
• W2024298468 modified "2023-10-15" @default.
• W2024298468 title "Influence of tides and waves on the fate of nutrients in a nearshore aquifer: Numerical simulations" @default.
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• W2024298468 doi "https://doi.org/10.1016/j.advwatres.2014.08.015" @default.
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