준설퇴적물의 부유원 강도의 평가

Abstract

The effect of dredging operations on the dispersion of resuspenended fine sediments has received great attention in recent years because of the environmental impacts and damages on marine ecosystem. Fine material resuspended by the dredging activity is advected and dispersed in the form of a plume by ambient currents. The dispersion of turbidity plume causes to increase suspended sediment concentrations above background levels which may be detrimental to the surrounding habitat. A variety of approaches such as particle-tracking method (Kang et al. 2001) have been used to develop prediction models. The field research has indicated that the initial dynamic phase of dispersion is very complex and the estimation of the resuspension source-strength at a dredging site is of primary importance to predict transport and dispersion of suspended material (Kang et al. 2004). Several approaches for estimating the strength of suspended source have been proposed by field measurements of suspended-sediment concentration near dredges (Nakai 1978 ; Pennekamp et al. 1996). In this study, the resuspension source-strength of sediments at the dredging sites of Gunsan and Busan Port has been estimated by using both of the field measurements and the analytical method proposed by Kuo and Hayes (1991)