The effect of submarine groundwater discharge on nutrient and salinity regimes in a coastal lagoon off Perth, Western Australia |
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| Authors: | R E Johannes C J Hearn |
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| Institution: | 1. Commonwealth Scientific and Industrial Research Organization (CSIRO), Division of Fisheries Research, PO Box 1538, Hobart, Tasmania 7001, Australia;2. Centre for Environmental Fluid Dynamics, The University of Western Australia, Nedlands 6009, Western Australia, Australia |
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| Abstract: | Submarine groundwater discharge (SGD) into a coastal lagoon off Perth, Western Australia, contains nitrate and silicate in concentrations two orders of magnitude higher than those of the receiving waters. This discharge delivers enough nitrate to replace that dissolved in the lagoon water mass about every eight days and enough silicate to replace the lagoon silicate in about 48 days. The delivery rate of nitrate nitrogen by SGD is equal to about 48% of that required for observed growth rates of lagoon macrophytes. Surface salinity is lower close to the shore as a result of SGD. During calm conditions a salinity front was observed in the lagoon, with a nearshore pool of nutrient-enriched water floating above the more saline ocean water. |
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| Keywords: | groundwater coastal waters frontal zones lagoons nutrients macroalgae sea grasses salinity variations |
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