Numerical studies on ecological effects of artificial mixing of surface and bottom waters in density stratification in semi-enclosed bay and open sea

Kentaro Mizumukai, Toru Sato, Sigeru Tabeta and Daisuke Kitazawa

Ecological Modelling, 2008, vol. 214, issue 2, 251-270

Abstract: An apparatus, which mixes waters in upper and lower layers in density stratification and discharges the mixture at the middle depth, has made a remarkable success in enhancing water quality for ecosystems in a small semi-enclosed bay. In this study, we conducted numerical simulations by using a three-dimensional tidal current model and an ecosystem model to predict the effects of the apparatus in two different seas; a larger semi-enclosed bay and the area around a solitary island in the open sea. Isahaya Bay in Ariake Sea was chosen as the former case to see how effectively the apparatus can reduce oxygen-deficient water, and the sea around Okinotori-shima Island represents the latter, where we are interested in the effect of the apparatus on fertilisation; how much primary production can be increased. As a result, it is suggested that the apparatus reduced up to 70% of oxygen-deficient water in Isahaya Bay during the neap tide in high summer, although it is not very effective in fertilising around the solitary island; only 0.3% of chlorophyll-a was increased in the area affected by the apparatus.

Keywords: Ocean model; Ecosystem model; Semi-enclosed bay; Solitary island; Water-quality enhancer; Density current (search for similar items in EconPapers)
Date: 2008
References: View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:ecomod:v:214:y:2008:i:2:p:251-270

DOI: 10.1016/j.ecolmodel.2008.02.023

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