• Proceedings of the Korean Society of Coastal and Ocean Engineers Conference
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• 1997.10a
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• pp.95-101
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• 1997

70년대 이후 서해 연안 개발 사업에 의해 아산만은 서해안 개발의 대표적인 지역으로 환경 변화의 속도가 그 어느 곳보다 빠르며, 방조제 건설과 간척지 개발로 인한 해안선의 변화와 항만 건설에 따른 준설 작업으로 인한 수심의 변화가 생기고 있는 지역이다 (Fig. 1). 그러나 이러한 급격한 변화 과정을 겪고 있는 아산만에서의 해수 순환과 오염물 확산의 문제에 대한 구체적인 연구 성과가 미비한 실정이다. (중략)

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.11
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• pp.477-493
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• 2020

This study conducted a seasonal survey to analyze the spatio-temporal variations of marine environments and phytoplankton community in Gochang Coastal Waters (GCW) from August 2016 to April 2017. In the results, the water temperature ranged from 2.1℃ to 34.5℃, showing a large seasonal variation, but the salinity changed from 31.14 psu to 32.64 psu. Therefore, the seasonal variations of water types in GCW were mainly determined by water temperature. The phytoplankton community consisted of 53 genera and 86 species, showing a relatively simple distribution. The phytoplankton cell density ranged from 2.2 to 689.2 cells mL^-1, with an average of 577.2 cells mL^-1, which was low in autumn and high in winter. The seasonal succession of phytoplankton dominant species was mainly diatoms during the whole year, Leptocylindrus danicus, Chaetoceros curvisetus, Skeletonema costatum-ls in summer, Paralia sulcata, Eucampia zodiacus in autumn, S. costatum-ls, Thalassiosira nordenskioeldii in winter, and S. costatum-ls, Asterionella glacialis in spring. In other words, the phytoplankton community showed high diversity in GCW throughout the year. According to the PCA, GCW were easily heated and cooled by radiant energy at lower depth, and the seasonal distributions of phytoplankton were determined by the supply of nutrients by re-fuelling of surface sediments due to the seawater mixing such as tidal mixing.

• Korean Journal of Environmental Biology
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• v.40 no.4
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• pp.464-476
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• 2022

In recent years, macroalgal bloom occurs frequently in coastal oceans worldwide. It might be attributed to accelerating climate change. "Green tide" events caused by proliferation of green macroalgae (Ulva spp.) not only damage the local economy, but also harm coastal environments. These nuisance events have become common across several coastal regions of continents. In Korea, green tide incidences are readily seen throughout the year along the coastlines of Jeju Island, particularly the northeastern coast, since the 2000s. Ulva species are notorious to be difficult for morphology-based species identification due to their high degrees of phenotypic plasticity. In this study, to investigate temporal variation in Ulva community structure on Jeju Island between 2015 and 2020, chloroplast barcode tufA gene was sequenced and phylogenetically analyzed for 152 specimens from 24 sites. We found that Ulva ohnoi and Ulva pertusa known to be originated from subtropical regions were the most predominant all year round, suggesting that these two species contributed the most to local green tides in this region. While U. pertusa was relatively stable in frequency during 2015 to 2020, U. ohnoi increased 16% in frequency in 2020 (36.84%), which might be associated with rising sea surface temperature from which U. ohnoi could benefit. Two species (Ulva flexuosa, Ulva procera) of origins of Europe should be continuously monitored. The findings of this study provide valuable information and molecular genetic data of genus Ulva occurring in southern coasts of Korea, which will help mitigate negative influences of green tide events on Korea coast.

• Journal of the Korean Geographical Society
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• v.37 no.4
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• pp.371-384
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• 2002

It is very important to predict the environmental changes in the land-surface as a way of prevention of sustainable nature. This study investigated the difference between the predicted and actual data of Anmyeon-do from 1981 to 2000 through a fuzzy logic operation using multi-spectral image. According to literature survey, maps, and ground truth data, the types of land-use have changed due primarily to shore reclamation or wild land and grassland fostering before the eighties. After the mid-eighties, however, a number of private residents and commercial stores quickly have spreaded throughout beach resorts and quasi-agricultural and forest areas. Moreover, shore and community regions were severely damaged in the nineties with increased farmland, due to the development of tour places and expansion of city area. The predicted result of the environmental changes in the land-surface using the fuzzy logic operation was almost similar to the state of Anmyeon-do obtained through the satellite image. Particularly, the flat lands near the shore was predicted to change slightly. This area is largely under development, thereby raising concerns on the shore environment. Thus, this method is applicable to conducting research on the change in the land-surface.

• Proceedings of the Korean Society of Coastal and Ocean Engineers Conference
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• 2003.08a
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• pp.134-136
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• 2003

강원도의 연도별 수산물생산실적을 조사한 표1에서 1995년도 어패류의 총 생산량이 88,030 백만톤이었으나 2000년도의 총생산량은 60,687백만톤으로 32 ％가 감소하였다. 이렇게 어획량이 감소하게된 주요원인은 해역의 환경변화가 크다고할 수 있는데, 수면을 육지화 하므로써 그 주위에서 어떠한 환경변화가 일어날 수 있으며 환경변화에 어떻게 대처할 것인가 하는 대책도 마련하여 개발에 따른 피해영향을 최소한으로 줄이고, 손상된 환경을 복원하고, 또한 이러한 것들이 불충분한 경우에는 새로운 환경을 재생, 창조하는 방법으로서 주문진 연안의 해안선과 기상, 해상 해저 등 물리적인 조건과 생물조건을 고려하여 주문진 해역에 적합한 인공어초를 제시하여야한다. (중략)

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2000.05a
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• pp.508-509
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• 2000

우리나라의 굴 양식업은 1970년대 수하식 굴 양식기술 개발보급으로 계속 증대 발전하였으나, 연안의 산업화와 도시화에 의한 수질환경 악화 그리고 장기간의 집약적 양식에 의한 어장 노화와 양식 굴의 품종 열화 등에 원인하여 1990년대에 들어서면서 양식 생산량이 점차 감소하는 경향을 보이고 있다. 따라서 굴 양식의 지속적 생산 방안의 모색을 위하여 환경 적응력이 강한 굴 품종을 선발하고 변화된 어장환경을 이해하고자, 산지별 굴의 양성 해역별 양성시험을 실시하여 굴의 성장도, 비만도 및 생존율의 비교 조사와 그리고 환경조사 등을 실시하였다. (중략)

• Journal of the Korean Society of Marine Environment & Safety
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• v.24 no.4
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• pp.451-458
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• 2018

The coast of Incheon reaches Incheon itself, Gimpo, Siheung, and Ansan of Gyunggi-do. Because this area has been seriously polluted, the Ministry of Oceans and Fisheries has established the Incheon Special Area Management Plan (SAMP) to preserve sea water quality as a marine environment asset. However, there is concern that actions taken in this area may change the surrounding marine ecology, being effected by farms, via a river that flows from waste lands, abandoned fishing activities and fishing nets, etc. Given this background, this study estimates the value of SAMP sea water quality using a choice experiment (CE). A CE survey of 1,000 households was undertaken, investigating trade-offs involving price and four attributes for selecting a preferred alternative to obtain a marginal willingness to pay (MWTP) estimate for each attribute. The estimation results showed that MWTP for a 1 %p improvement in sea water quality, the diversity of fauna species, the diversity of flora species, and a 1 %p reduction in marine litter as a result of conserving Incheon coastal sea water quality are estimated to be KRW 75, 135, 309 and 72 per household per year, respectively. All estimation results were statistically significant at the 1 % level. These findings can provide policy makers with useful information for evaluating and planning marine environmental management policies.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2000.05a
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• pp.41-42
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• 2000

국제해양법이 제정된 이래 국내외의 정세변화에 따른 수산업의 침체에 대처해 나가기 위해서는 연안어장의 해양환경을 쾌적하게 조성하고 여기에서 조업하는 조업어선들의 구조와 운용설비 개선에 대한 대책이 마련되어야 한다. 특히 어선어업에 있어서는 어선에서 발생하는 소음은 선박에 종사하는 어업인과 어군에 직접적인 영향을 미치게 되므로 이들 영향을 최소화하기 위한 연구가 성실히 수행되어야 할 것이다. 본 연구는 소형어선의 항주 중의 수중소음의 어류에 미치는 영향을 파악하기 위한 기초자료를 얻고자 2000년 3월 2일∼4월 10일 여수연안에서 동일한 크기의 신조 소형 연안복합어선(GT 6.66)의 항주중인 선박의 수중소음을 측정, 분석한 결과이다. (중략)

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.24 no.4
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• pp.287-294
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• 2012

Sedimentary environment in coastal zone has been changing due to a large number of coastal structures and continuous coastal development. As a result, the environment has been changing. In particular, the economic and environmental damage can occur due to cohesive sediment transport closely related with the fate of pollutants. Due to large sea wall construction the ebb dominance in the Mokpo coastal waters has been clearer. Cohesive sediment transport was simulated by the EFDC model. The simulated SS showed good agreements with the observed SS. From the sensitivity analysis of sediment parameters, we found out that the erosion rate, the critical shear stresses for erosion and deposition, and the settling velocity are important factors in cohesive sediment transport modeling.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.20 no.1
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• pp.34-41
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• 2008

Future impact of anthropogenic climate-induced change on ecological regime has been an issue and information on water temperature is required for estimating coastal aquatic environment. One way to induce water temperature is to relate water temperature to air temperature and GCM is able to provide future air temperature data to do this. However, GCM data of low spatial resolution doesn't incorporate local or sitespecific air temperature in need of application, and downscaling processes are essential. In this study, a linear regression is used to relate nationally averaged air temperature to local area for the time period of 2000-2005. The RMSE for calibration (2000-2005) is 1.584, while the RMSE for validation is 1.675 for the year 2006 and 1.448 for the year 2007. The NSC for calibration (2000-2005) is 0.962, while the NSC for validation is 0.955 for the year 2006 and 0.963 for the year 2007. The results show that the linear regression is a good tool to relate local air temperature to nationally averaged air temperature with $1.0{\sim}2.0^{\circ}C$ of RMSE. The study will contribute to estimate future impact of climate-induced change on aquatic environment in Korean coastal zone.