Estimation of Pollutants Residence Time During the Flood and Dry Season in Gwangyang Bay

J. Ocean Eng. Technol. 2008;22(6):20-26.

Lee In-Cheol,Kim Jin-Hyuk,Kong Hwa-Hun

Department of Ocean Engineering Pukyong National University,Department of Ocean Engineering Pukyong National University,Samsung Heavy Industry Co. Ltd. Offshore Engineering Team 1 Piping Design

광양만의 홍수기 및 갈수기의 오염물질 체류시간 산정

이인철,김진혁,공화훈

부경대학교 해양공학과,부경대학교 해양공학과,삼성중공업(주) 해양설계 ¹팀 배관설계

Keywords: Gwangyang Bay, Pollutant loads, Water quality, Tank model, Residence time

핵심용어: 광양만, 오염부하, 수질, 탱크모형, 체류시간

Abstract

In this paper, in order to set up the management system of water quality environment in Gwangyang Bay, the cluster analysis of water quality environment, the estimation of inflowing pollutant loads and residence time of pollutants in this bay was carried out. The Gwangyang Bay was divided into eight sea areas by cluster analysis and spatio-temporal change of water quality. The river discharges in the Bay were calculated about $11,681{ imes}103m^3/day$ from the numerical simulation by Tank model. In addition, inflowing pollutant loads of COD, SS, TN, TP, DIN and DIP in Gwangyang Bay were estimated at 398 ton-COD/day, 2,846 ton-SS/day, 195 ton-TN/day, 5 ton-TP/day, 126 ton-DIN/day and 3 ton-DIP/day, respectively. Moreover, residence times of COD, TN and TP in the Bay was estimated at 6 days-COD, 20 days-TN and 195 days-TP, respectively in the dry season, and 3 days-COD, 6 days-TN and 21 days- TP, respectively, in the flood season. The central part of Gwangyang Bay (Region IV) has the longest residence time of overall pollutants.