새우조망 조업구역과 비조업구역의 해저퇴적물 분석
Analysis of marine sediments between fishing area and non-fishing area in the shrimp beam trawl
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초록
새우조망에 의한 해저 퇴적물의 교란을 조사하기 위해 4개의 조사정점에 대해 해저표면으로부터 6cm까지의 퇴적물을 채집하여 물성을 분석하였다. 조사구역의 퇴적물 유형은 (g)mS (slightly gravely muddy sand), gmS (gravely muddy sand) 등으로 모래의 함량이 높게 나타났으며 부분적으로 (g)sM (slightly gravely sandy mud), gsM (gravely sandy mud) 등으로 나타났다. 각 조사구역의 퇴적물 입도 변화는 조사 시기적 차이보다는 위치적 특성이 더 큰 것으로 판단되며 패각류와 유기물을 제거하기 전에는 퇴적물 입도의 위치적 특성을 찾기는 힘들었으나 이들을 제거하면 내해에서 외해로 나가면서 점점 평균입도가 커지는 것을 알 수 있었다. 새우조망 구역의 퇴적물의 입도는 전처리 후에는 입도가 세립해지지만 새우조망 구역이 아닌 구역은 전처리 전후의 입도의 크기 차이가 많지 않았다. 이러한 이유는 새우조망 구역에서는 새우조망의 조업에 의해 패각류 등이 분쇄되어 부유되었다가 다시 표면에 퇴적되었기 때문으로 추측된다. 새우조망 구역에서 분쇄된 패각류가 다시 표층으로 퇴적된다는 본 연구의 가설을 증명하기 위해서는 향후 새우조망에 의해 부유하는 퇴적물을 채집하여 그 성분을 분석하는 실험이 필요할 것으로 판단된다.
Abstract
The properties of sediment collected from seabed surface to 6cm depth on the four positions were analyzed to investigate turbulence of marine sediments by shrimp beam trawl. Types of sediments in the investigation area were (g)mS (slightly gravely muddy sand) and gmS (gravely muddy sand) showing high sand content, and (g)sM (slightly gravely sandy mud), gsM (gravely sandy mud) as well. It is estimated that position is more crucial factor than seasonal difference for the granularity variation of sediment in each investigation area. Finding the positional characteristics of sediment granularity was difficult before removing shells and organic matter. However, the average granularity is getting larger by going out from inland sea to open sea once those were removed. The granularity of marine sediment got narrow after processing in the fishing area for shrimp beam trawl but there was no big difference for granularity size before and after processing in the non-fishing area. This might be attributed to crushed shell particles going up and down again on the surface in the fishing area. To demonstrate the hypothesis mentioned above, the sediments driven by shrimp beam trawl need to be collected and analyzed.
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