• Title/Summary/Keyword: 연변수지수

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On the Annual Variations of Water Temperature and Salinity in Kwang Yang Bay (광양만의 수온과 염분의 연변화에 관하여)

  • 한영호
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.11 no.1
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    • pp.1-7
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    • 1975
  • The physical oceanographic investigations in Kwang Yang Bay, were carried out for seven times from May 1974 to May 1975. The results of this survey show that the salinity of the bay water is generally lower than that of the adjacent sea water, and mean surface salt ni ty in March and July were 20.8-25.2\ulcorner and 31. 8-32. 5\ulcorner. The month with the minimum surface water temperature was January with $2.5~5.2^{\circ}C:$ the maximum monthly value was $ 23.8-24.2 ^{\circ} C$ in September. The surface water temperature were related to the heat budget at the sea surface in the bay water, the degree of relationship was good. The mean vertical stability in the bay water(0-10m)were 297XI0^{-6} in July and -IXto^{-6} in January. The computed vertical stability indicate that the vertical mixing could move down to the depths of 15m during late autumn and winter, but the rest of season hardly take place to the depths of tom.

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Estimation on Population Ecological Characteristics of Crucian Carp, Carassius auratus in the Mid-Upper System of the Seomjin River (섬진강 중.상류 수계에서 붕어 개체군의 생태학적 특성치 추정)

  • Jang, Sung-Hyun;Ryu, Hui-Seong;Lee, Jung-Ho
    • Korean Journal of Environment and Ecology
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    • v.25 no.3
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    • pp.318-326
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    • 2011
  • The population ecological characteristics of the Crucian carp, Carassius auratus, were determined in order to estimate stock of the mid-upper system of the Seomjin River. The fish ranged in size from 95 to 288mm total length. The age was determined by counting the scale annulus. The scales displayed clear annulus that were used to estimate the age. The oldest fish observed in this study was 5 years old. Age-2 fishes were the most numerous in the sample(n=38), followed in frequency be age-3(n=22). Marginal index analysis validated the formation of a single annulus per year. The relationship between body length and body weight was BW = $0.0038BL^{3.73}$($R^2$=0.96) (p<0.01). The relationship between the scale radius and body length was BL = 2.362R+2.76($R^2$=0.89). The von Bertalanffy growth parameters estimated from a non-linear regression method were $L_{\infty}$=33.2 cm, $W_{\infty}$=1,798.4 g, $K=0.20year^{-1}$ and $t_0$=-0.51year. Therefore, Growth in length of the fish was expressed by the von Bertalanffy's growth equation as $L_t=33.23$($1-e^{-0.20(t+0.51)}$)($R^2$=0.98). The annual survival rate was estimated to be 0.427year$^{-1}$. The instantaneous coefficient of natural mortality of estimated from the Zhang and Megrey method was $0.784year^{-1}$, and instantaneous coefficient of fishing mortality was calculated $0.067year^{-1}$. From the estimates of survival rate, the instantaneous coefficient of total mortality was estimated to be $0.851year^{-1}$.

Effects of Organic Peroxide Compatibilizer on the Physical Properties of the Biodegradable Plastic Film (과산화물 상용화제 첨가가 생분해 바이오 플라스틱 필름의 물성에 미치는 영향)

  • Han, Jung-Gu;Park, Seung Joon;Chung, Sung Taek;Li, Fanzhu;Kim, Pan-Chae;Kuk, YoungRye;Park, Hyung Woo
    • KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
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    • v.27 no.3
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    • pp.159-167
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    • 2021
  • The need for biodegradable plastic continues to increase, improvement of physical properties is necessary for actual use in the market. In this study, composite film was produced by adding peroxide additives to bioplastic according to concentration to investigate changes in the melt index, elongation, morphology, and TGA of the composite film. The addition of peroxide compatibilizer showed superior elongation of film and TGA compared to those of control. The added amount of compatibilizer affected the extrusion process, and it was revealed that adding an appropriate amount of peroxidizer is important. Analysis of the composite film's morphology revealed a heterogeneous dispersion sequence due to different rates of crystallization depending on the resin, and surface physical properties were best in the group added with 4% peroxide. The results above showed that the test group added with 4% peroxide compatibilizer was superior in the production of composite biodegradable film.

Evaluation of Sejong Base as a Long Term Monitoring Site for Chromophoric Dissolved Organic Matter (CDOM) Variation in the Antarctic Ocean (남극해 유색 용존 유기물질의 장기 변동성 모니터링을 위한 세종 기지의 활용 가능성 평가)

  • Jeon, Mi-Hae;Park, Mi-Ok;Kang, Sung-Ho;Jeon, Misa
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.25 no.7
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    • pp.898-905
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    • 2019
  • As the positive feedback between the absorption of chromophoric dissolved organic matter (CDOM) and acceleration of ice melt can impact the aquatic biota and dynamic heat budget, long-term monitoring of the CDOM variation in the polar ocean is necessary. However, the monitoring of CDOM is not easy because of harsh weather and difficult access, especially in the Antarctic Ocean. Therefore, the purpose of this study was to find a suitable long-term monitoring site for CDOM variation; we selected Maxwell Bay and Marian Cove at Sejong Base and horizontal and vertical distributions of CDOM were measured. After a 72 hr time-series measurement test of the CDOM variation at Sejong Dock and Sejong Cape in Maxwell Bay, Sejong Dock was selected, as it does not haveland discharge effects. The seasonal variation of CDOM was evident and the average CDOM concentration of Maxwell Bay was comparable with the adjacent sea. The CDOM at Sejong Dock from February to November 2010 was the highest in the fall and winter and the lowest during spring and summer. Thus, based on our one-year CDOM data, we suggest that Sejong Dock in Maxwell Bay is suitable for long-term monitoring of CDOM as an indicator of photochemical and biological environmental change and an important factor in determining the heating budget in the Antarctic Ocean.

Annual cycles of nutrients and dissolved oxygen in a nutrient-rich temperate coastal bay, Chinhae Bay, Korea (영양염류가 풍부한 온대 해역 내만(한국, 진해만)에서의 영양염류와 용존산소의 연변화)

  • HONG, GI HOON;KIM, KYUNG TAE;PAE, SE JIN;KIM, SUK HYUN;LEE, SOO HYUNG
    • 한국해양학회지
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    • v.26 no.3
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    • pp.204-222
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    • 1991
  • The annual cycles of plant major nutrients and dissolved oxygen in a nutrients-rich semi-enclosed coastal inlet, chinhae Bay, of the southern coast of the Korean Peninsula are first presented. The water column of the bay is stratified during summer (April-late September) and well0mixed during winter (October-March). During the summer stratification period, dissolved oxygen contents exceed 400uM in the surface but diminish to less than 50uM in the near bottom waters, which often results in an anoxic environment in the inner part of Chinhae Bay. After the breakdown of the stratification in October, dissolved oxygen concentration remains undersaturated until February. The evidence of allochthonous input of N-nutrients throughout the year is readily seen in the water column: however. crude budget calculations show that the nutrients are efficiently utilized within the bay ecosystem, and that export of the nutrients from the bay to the shelf must be negligible. There is no sign of the enrichment of the nutrients in the water column. The eutrophication phenomenon sensu stricto is not observed in chinhae Bay. Using the standing stock of dissolved oxygen and estimation of the oxygen fluxes across the air-sea boundary, a benthic oxygen respiration rate during winter is estimated conservatively at 21-24 mmol Cm/SUP -2/d/SUP -1/. this oxygen respiration rate accounts for about 20% of the total phytoplankton production in winter.

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