지화학적 자료에 근거한 광양만 표층퇴적물의 특성과 저서환경

Abstract

- A total of 110 surface sediment were analyzed in order to understand thegeochemical characteristics of the surface sediments and to evaluate the benthicenvironmental condition of Gwangyang Bay. The surface sedimentary distribution canbe classified by five facies; mud (M), sandy mud (sM), sand (S), muddy sand (mS) andgravely sand mud ((g)sM). However, mud face is the predominant sedimentary featureof the Gwangyang Bay. The benthic environment based on total organic carbon/totalnitrogen (C/N) and total organic carbon/total sulfur (C/S) ratios of organic mattershowed that anoxic environment is prevailed in some parts of the study area becausethe C/S ratio of organic matter was higher than 2.8. The hydrogen sulfide (H2S) contentshowed extreme variability from site to site. It varies from 367 ppm to 1 ppm (average,92 ppm). The inter-relationship of redox -sensitive elements (Mn, V, Mo and Cr)showed a relatively strong positive relationship with high accumulation in thesediment at the inner sites of the Bay (left of Myo Island). High content of TOC andhydrogen sulfide, and a high accumulation rate of redox-sensitive element werepredominant characteristics in the sediments at the inner sites of the Bay (left of MyoIsland), suggesting that this area is in an oxygen deficient, and potentially pollutedcondition.