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Modeling of Water Quality with Sediment-Water Interaction at Sea Bottom in Semi-enclosed Coastal Waters - Application to Osaka Bay  

Han, Dong-Jin (Hydro-soft Technology Institute co.)
Yoon, Jong-Sung (Department of Civil Engineering, Inje University)
Publication Information
Journal of Korean Society of Coastal and Ocean Engineers / v.17, no.3, 2005 , pp. 129-137 More about this Journal
Abstract
In this study, we developed a model to simulate the interaction between sediment and the overlying water. The model deals with water-sediment interaction in terms of the sedimentation of organic detritus from the pelagic zone into the benthic zone and the release of nutrients occurring in the reverse direction. The model was tested and verified by comparing the predicted release rates of phosphorus from the sediment in Osaka Bay with actual observed values. The results accurately reproduced the seasonal change in release rates. The results well represented seasonal change of the release rates. A long-term prediction of water and sediment quality was performed for the period from 1950 to 1999. Nutrient loads from land and the boundary conditions of 3-D baroclinic flows were season-adjusted. The model accurately reproduced the changing trends in phosphorus, nitrogen, and COD concentrations in Osaka Bay over a long period of time.
Keywords
water quality; release; interaction; semi-enclosed costal water;
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