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이규형 ( Gyu Hyong Lee ) 한국어업기술학회 2012 수산해양기술연구 Vol.48 No.1
In order to elucidate the mechanism of fishing condition variation of anchovy in the set net fisheries of Anggang Bay, the monthly catch of anchovy was analyzed and examined based on the data acquired from 2006 to 2010 in 13 different fishing grounds. Anchovy consistently appeared from April to December and reached the production of 840 to 1,424 t (average : 1,228 t), with a big annual variation. However, anchovy production in this area accounts for approximately 75% of the production by set net in Anggang Bay whereas it holds 6.8% of the nationwide production (〓18,034 t) by set net. The school of anchovy starts to appear in April at the west mouth of the bay and move north-eastward. Afterward, having three of clockwise turns in the middle of the bay, they scatter to swim into the deep place of the bay and finally go out to turn back to their coming way. These behaviors of anchovy are likely related to thermal fronts as well as distributions of food. The production of anchovy (y, kg) relied greatly on frequencies of effective northeasterly (x1) or northwesterly (x2) wind (≤3.5m/s) which blow between April and June. Their relationships are as follows: y〓1086.27+ 21.499x1-15.16x2 (r〓0.901). Consequently, we concluded that the northeasterly wind, which appears in the breeding season of spring, played a role to retard the movement of anchovy school to the eastern sea, while the northwesterly wind inhibits the invasion of anchovy school into the bay.
이규형(Gyu Hyong Lee),한명일(Myong Ill Han) 전남대학교 수산과학연구소 2012 수산과학연구소논문집 Vol.20 No.-
In order to acquire the data for understanding of sea conditions as well as the management of fishing grounds, seasonally oceanographic field measurements have been conducted from November 1998 to July 1999 in Aenggang Bay which is located at the southern coast of Korea. All the field data revealed a great deal of variation ranging such as 8.04~24.51℃ in water temperature, 31.87~34.08 in salinity, 21.36~26.55 in density(=sigma-t), 1.5~9.6 in transparency, and 6~11 in water color. In Aenggang Bay the stratification was easily destroyed by dropping of air temperature in autumn and winter, and a thermal front was made between the cold inner bay waters and the outer bay waters, meeting in the middle of the bay when a large amount of outer bay waters come into the bay. On the contrary, in spring and summer a strong thermocline with a decline of approximately 0.4℃/m was made around the depth of 5m because of the rise of air temperature. However, this front appears at the surface of the inside mouth of the bay when a large amount of outer bay waters invades at flood tide whereas it disappears easily at the strong wind.
추효상(Hyo Sang Choo),이규형(Gyu Hyong Lee),윤양호(Yang Ho Yoon) 한국수산과학회 1997 한국수산과학회지 Vol.30 No.2
Temperate and salinity were observed in Kugum Suro Channel in February, April, August and October 1993. Temperate ranged from 7.0℃ to 25.0℃ throughout the year and its variation was about 18℃. The maximum temperature difference between surface and bottom was less than 0.75℃ for a year, which meant that the temperature stratification in Kugum Suro Channel was considerably week. Salinity had also a small variation range of less than 0.5 ‰. Salinity varied from 34.0 ‰ in April to 30.0 ‰ in August and its fluctuation patterns were quite similar to the seasonal variations of the precipitation and the duration of sunshine observed at Kohung Weather station. Seasonal variation of sea water density in T-S diagram showed that the water mass in Kugum Suro Channel could be largely affected by regional atmospheric conditions. Temperature increased in ebb tide and decreased in flood tide, but salinity decreased in ebb tide and increased in flood tide for a day. The period of fluctuations in temperature and salinity measured for 25 hours was nearly coincident with the semi-diurnal tide which was predominant in that region. Stratification parameters computed in Kugum Suro Channel areas were less than 4.0 J/㎥ the year round, which indicated that vertical mixing from the bottom boundary caused by tidal current played an important role in deciding the stratification regime in Kugum Suro Channel. In estimating the equation which defines stratification and mixing effects in the observed areas, the tidal mixing term ranged from 4.7 J/㎥ to 14.1 J/㎥ was greater than any other terms like solar radiation, river discharge and wind mixing.