Study on nutrient distribution and interaction with sediments in a macro-tidal estuary

Liang, Dongfang, Wang, Xiaolin, Bockelmann-Evans, Bettina Nicole ORCID: https://orcid.org/0000-0003-4208-9341 and Falconer, Roger Alexander ORCID: https://orcid.org/0000-0001-5960-2864 2013. Study on nutrient distribution and interaction with sediments in a macro-tidal estuary. Advances in Water Resources 52 , pp. 207-220. 10.1016/j.advwatres.2012.11.015

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Abstract

An integrated hydro-environmental model has been developed for predicting the distribution of nutrients in estuarine and coastal waters. This paper also reports on an application of the model to the Loughor Estuary in the U.K., which has a high tidal range. The horizontal two-dimensional model considers the hydrodynamic, sediment transport, dissolved oxygen and nutrient cycling processes. In particular, the effect of sediment suspension and deposition on the nutrient distribution in the water column has been included in the model. A TVD-MacCormack scheme has been adopted to numerically solve the coupled partial differential equations. Field surveys and laboratory experiments in connection with the Loughor Estuary were conducted to obtain measured data for model calibration and verification. It was found that the linear isotherm model gave a good approximation of the adsorption/desorption processes over the range of nitrogen and phosphorus concentrations measured in the natural estuary. Through experiments on the collected soil samples, the salinity-dependent partition ratios between the adsorbed and dissolved nutrients were determined. The results of the established model showed good agreement with the measured data. Finally, the model was used to examine the implications of changing the sewage effluent discharge scheme on the nutrient distributions in the estuary.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Advanced Research Computing @ Cardiff (ARCCA) Engineering
Subjects:	G Geography. Anthropology. Recreation > GE Environmental Sciences T Technology > TA Engineering (General). Civil engineering (General) T Technology > TC Hydraulic engineering. Ocean engineering
Uncontrolled Keywords:	Nutrients; Water quality; Shallow water flows; Sediment transport; Adsorption/desorption; Estuaries
Publisher:	Elsevier
ISSN:	0309-1708
Funders:	Royal Society
Last Modified:	21 Oct 2022 10:44
URI:	https://orca.cardiff.ac.uk/id/eprint/41217

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