• Proceedings of the Korean Environmental Sciences Society Conference
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• 2007.05a
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• pp.307-307
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• 2007

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 2003.04a
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• pp.272-274
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• 2003

• Proceedings of the KTCVS Conference
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• 1996.10a
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• pp.115-115
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• 1996

• Journal of the Korean Society of Marine Environment & Safety
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• v.24 no.6
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• pp.764-772
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• 2018

It is necessary to explore the possibility of alternative habitats and research the characteristics of basic habitats due to seeding, culturing and harvesting of blood clams (Tegillarca granosa) in tidal flats. Currently, dependence on naturally occurring spat is much higher than in other species, which may lead to a reduction in biological resources. In this study, we selected a total of 5 sites (Changgi, Hopo in Cheonsu Bay and Dangsan, Sachang, Wangsan in Garolim Bay) and examined habitat suitability factors for suitable site selection. Also, we considered the relationship of habitat suitability factors (Environment: water content, organic content; survival: mud content, mean size; growth: chlorophyll a). As a result, Wangsan had the highest score of the main habitat of blood clams (Habitat suitability score, Wangsan: 87; Dangsan: 86; Sachang: 81; Hopo: 78; and Changgi: 73). The sediment in Garolim Bay was fine-grained and the seasonal variation was lower than Cheonsu Bay. Therefore, it is considered that Garolim Bay is more suitable as a potential area and easy to utilize the space. In the future, search and selection of potential suitable sites could be considered to solve problems caused by the reduction of biological resources and the production for blood clams.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.34 no.5
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• pp.1383-1393
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• 2014

Recently, with rapid improvement in computer hardware and theoretical development in the field of computational fluid dynamics, high-order accurate schemes also have been applied in the realm of computational hydraulics. In this study, numerical solutions of 1D shallow water equations are presented with TVD Runge-Kutta discontinuous Galerkin (RKDG) finite element method. The transcritical flows such as dam-break flows due to instant dam failure and transcritical flow with bottom elevation change were studied. As a formulation of approximate Riemann solver, the local Lax-Friedrichs (LLF), Roe, HLL flux schemes were employed and MUSCL slope limiter was used to eliminate unnecessary numerical oscillations. The developed model was applied to 1D dam break and transcritical flow. The results were compared to the exact solutions and experimental data.

• Proceedings of KOSOMES biannual meeting
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• 2004.05b
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• pp.107-112
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• 2004

In order to improve the safety r! ship berthing and the efficiency r! berth operation in the harbour, the berthing energy acting on a ship in berthing maneuver need to be estimated properly. The berthing energy is used as one q the criteria to determine the maximum permissible load of fender as well as important factors to establish the berthing speed and the required power r! tug-beat for pilot and ship operator. In this study, some problems r! present the method of berthing energy are discussed on the basis of the hydrodynamic aspects. Then, series calculations of berthing energy are carried out considering the effect of water depth on added mass and the ship shape for container series from 1,600TEU to 12,000TEU.

• Journal of Navigation and Port Research
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• v.29 no.8 s.104
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• pp.673-678
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• 2005

In order to improve the safety of ship berthing and the efficiency of berth operation in the harbour, the berthing energy acting on a ship in berthing maneuver need to be estimated properly. The berthing energy is used as one of the criteria to determine the maximum permissible load q{ fender as well as important factors to establish the berthing speed and the required power of tug-boat for pilot and ship operator. Some problems of berthing energy are discussed on the basis of the hydrodynamic aspects. Then, series calculations of berthing energy are carried out considering the effect of water depth on added mass and the ship shape for container series from 1,600TEU to 12,000TEU.

• Korean Journal of Microbiology
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• v.27 no.3
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• pp.265-271
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• 1989

Bacteria isolated from Cheonsu Bay at 4 seasons were analyzed by numerical taxonomic method. Results of 48 morphological, physiological and biochemical tests showed different adaptability of bacteria to temperature in consequence with sampling season and isolated bacteria were able to survive at various environmental conditions, Identification results revealed that Enterobacteriaceae, Aeromonas, Pseudomonas and Vibrio were dominant genera in geterotrophic bacterial community. For each season, Aeromonas was most dominant in spring and autumn, Pseudomonas and Enterobacteriaceae in summer and winter, respectively. Cluster ananlysis was performed and all vacteria were clustered into 29 phenetic groups. Seasonal characteristics were distict in each group. Different physiological characteristics and species compositions for each season contribute to the stability and diversity of environmental ecosystem.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.8 no.1
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• pp.103-113
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• 1996

Two-dimensional finite element hydrodynamic models for long wave simulation usually adopt fixed land boundary. However moving boundary treatment is strongly required in the simulation of tidal flats for west and south coast of Korea. In this study very efficient and realistic moving boundary treatment is applied by considering incident long wave surface slope. Developed STEP-CM (Superior Two-step Explicit Program for Coastal Modeling) ,shows numerically stable results in comparative study for idealized one-dimensional channel. Real application of the model is done for Chonsu Bay where tidal flats are distributed along the coast. Nonlinear tidal current and tidal flat effects are easily simulated in STEP-CM and resulting circulations are detected around headland of Wonsan Island.

• Monthly Duck's Village
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• s.215
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• pp.8-13
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• 2021

고병원성조류인플루엔자가 지난 4월 6일 전남 장흥에서 마지막으로 발생한 이후 한달 이상 추가 발생이 없어 종식단계에 접어들었다. 지난해 11월 26일 최초 발생한 고병원성조류인플루엔자는 235일간 가금농장에서 106건, 관상용 2건을 비롯해 야생조류에서 234건이 검출됐고, 이로 인해 487농가에서 3천만수에 육박하는 가금류가 살처분됐다. 이중 오리는 육용오리 96농가 184만9천수, 종오리 23농가 184천수가 살처분됐다. 특히 종오리의 경우 농가수로는 35%가 피해를 입었으며 사육수수로는 4월말 현재 산란종 오리수가 전년대비 17.1%가 줄어들었으며 평년에 비해서는 30% 가까이 줄어들었다. 때문에 당분간 육용오리 생산에 차질이 불가피하며 살처분 농가들의 입식도 늦어질 것으로 예상되고 있다. 이처럼 고병원성조류인플루엔자 발생으로 인해 국내 오리산업은 큰 피해를 입었으며 정상으로 회복하기까지는 상당한 시일이 소요될 것으로 예상된다. 우리나라 뿐만 아니라 전 세계적으로도 고병원성조류인플루엔자로 인해 몸살을 앓고 있다. 아시아는 물론 유럽, 아프리카, 북아메리카까지 고병원성 조류인플루엔자가 지속적으로 발생하고 있기 때문이다. 전 세계적인 고병원성조류인플루엔자 발생은 장기적으로 국내 오리산업에도 악영향을 미칠것으로 예상되고 있다. 원종오리를 수입하고 있는 영국 등에서도 고병원성조류인플루엔자가 발생함에 따라 가금류의 수입이 중단되면서 장기적으로 종오리 수급에도 차질이 예상되기 때문이다. 이에 이번호에서는 앞으로의 종오리 수급 현황 및 전망에 대해 살펴봤다.