Journal of the Korean Society of Fisheries and Ocean Technology (수산해양기술연구)

The Korean Society of Fisheries and Ocean Technology (한국수산해양기술학회)
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Analysis of marine sediments between fishing area and non-fishing area in the shrimp beam trawl

새우조망 조업구역과 비조업구역의 해저퇴적물 분석

  • Cho, Sam-Kwang (External Research Cooperation Division, National Fisheries Research & Development Institute) ;
  • Yang, Yong-Soo (Fisheries System Engineering Division, National Fisheries Research & Development Institute) ;
  • Cha, Bong-Jin (Fisheries System Engineering Division, National Fisheries Research & Development Institute) ;
  • Seo, Young-Kyo (GEMATEK Co. LTD.)
  • Received : 2012.04.19
  • Accepted : 2012.08.21
  • Published : 2012.08.31
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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.

Keywords

Acknowledgement

Supported by : 국립수산과학원

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