• The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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• v.17 no.4
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• pp.203-224
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• 2012

Definition of estuary and its administrative boundaries is needed for the practical management of estuarine environment. However, the majority of Korean estuaries are lack of scientific data required for defining the administrative boundaries. For this reason, a systematic way to set the boundaries has not been developed so far. This study proposed adaptive and comprehensive criteria in defining the boundary of an estuary based on the available data which includes physiochemical, geographical and topographical characteristics and regional data such as land uses and socio-economic conditions. An estuary boundary is defined with a sequential manner. First of all, according to the estuarine circulation pattern, 463 estuaries in Korea were classified into open estuaries and closed estuaries. Then an individual belonging to each type of estuary is defined an water zone boundary considering the physiochemical, geographical and topographical characteristics and land uses. Finally, a land zone boundary is set along the catchment. According to the proposed criteria, we have delineated 274 estuarine management zones in Korea on a trial basis and found that it was possible to set a boundary reasonably considering the difference of level of available data and regional characteristics in each estuary.

• Journal of Wetlands Research
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• v.13 no.3
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• pp.593-602
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• 2011

The estuarine area of the ecological environment had been seriously damaged by reckless developments during the past half century. The demand for management in estuarine area increased but the efficient management system did not exist. Therefore the aim of this study is to develop a GIS-based integrated DB management system by integrating the ecological environmental data of each division in estuarine area. To achieve this, the system used integrated DB. It is classified into a surveyed monitoring DB in 2010 at estuarine area of Yeongsan and GIS DB to express the spatial data. The integrated DB management system was developed using VisualBasic.NET languages and Arcobjects component for Map-based spatial analysis. Also, to improve the utilization of data, the composition of GUI(Graphical User Interface) through user needs analysis, the expression of monitoring DB, the priority of layer and the function for modular unit were defined. Ultimately the system was developed based on the defined items. GIS-based integrated DB management system can support to understand the ecological environment in estuarine area of Yeongsan river. Also it will provide the users with effective sharing and environmental management of the data. In the future study, comprehensive diagnosis for ecological environment in estuarine area and the reliable prediction need to be made by connecting modeling system.

• Journal of the Korean Society of Marine Environment & Safety
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• v.16 no.4
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• pp.369-379
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• 2010

Zooplankton community structure and copepod production in Seomjin River estuary were investigated at 10 stations along the salinity gradients from May 2009 to February 2010. Total zooplankton taxa were identified to be 31 in the study area and seasonal average abundance of zooplankton was $4,151\;ind.{\cdot}m^{-3}$ during the study period. Zooplankton community was mainly composed of coastal species in dry season. However, brackish species dominated in upper or middle part of this estuary in flood season. This study showed that the growth rates of Acartia spp. and Paracalanus parvus s.l. measured from field experiments were regulated by the variations of Hater temperature and salinity; The annual copepod production estimated by dominant copepod species was $3.49\;g\;C{\cdot}m^{-2}yr^{-1}$, and the relatively high production value could be explained by the high phytoplankton standing stocks and the mass occurrence of coastal and brackish species with relation to various salinity gradients in Seomjin River estuary.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2007.06a
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• pp.231-234
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• 2007

This study proposes a Web GUI system using MGIS-based three-dimensional data models and hydrodynamic model. The study of Web GUI (Graphic User Information) system based on the MGIS (Marine Geographic Information System) is mainly performed on effective methodologies which transform real world data to computing world data. Finally, we design a Seomjin River Estuary Web GUI system integrating above data models. It must adds more ecological information and the various service item for approach more easily in order to user.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2018.05a
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• pp.70-72
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• 2018

낙동강하굿둑 하구 하류역의 기존 연구결과를 살펴보면, 대부분 하천에 의한 영향을 중심으로 수행되었다. 그러나, 현재의 낙동강하굿둑 하구 하류역은 기존 연구결과와는 달리 외해쪽의 외력 영향을 받는 양상을 보이고 있다. 따라서, 금회 연구에서는 이러한 현재의 양상을 위주로 수치모델링을 수행하여 주변 해역의 매립에 따른 유속저하에 따른 퇴적우세 현상을 설명하려 한다. 또한, 부산항 신항 건설로 인한 영향이 현재의 퇴적양상에 어떤 기여를 하고 있는지를 시간적으로 역추산하였다. 이러한 현상 재현을 위하여 5개분조를 고려한 해수유동 실험을 수행하고 이에 더하여 외해파랑 영향을 추가하여 실제 현상을 재현하였다. 연구결과, 낙동강하굿둑 하구 하류역 지형변화에 주된 영향을 주는 외력조건은 파랑 인 것으로 파악되었으며, 이에 상세한 결과를 도출하기 위하여 상세조건을 추가한 실험을 수행할 계획이다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2018.11a
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• pp.38-39
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• 2018

낙동강 하구 하류역의 지형변화는 장기간에 걸쳐 변화가 발생하고, 이러한 지형변화의 메커니즘을 파악하는 것은 하구의 관리방안과 처리방법 등을 연구하는데 있어서 매우 중요하다. 본 연구에서는 낙동강 하구 하류역의 지형변동에 관한 기초자료를 수집 분석하였으며, 이를 근거하여 지형변화 예측실험을 수행하였다. 실험결과, 하굿둑 건설과 부산신항 건설 등의 대규모 개발사업으로 인한 해수면 축소로 인한 유속감소로 인하여 전반적인 퇴적우세 현상이 지속되는 것으로 나타났다. 또한, 해빈류 실험결과 울타리선 남쪽과 동서쪽으로 지형 발달 및 성장이 지속될 것이라 판단된다.

• Journal of the Korean Society of Marine Environment & Safety
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• v.14 no.2
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• pp.135-143
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• 2008

An emergy concept was used to evaluate the environment and economy of the estuarine areas of Yeongsan River, Seomjin River, and Han River in Korea. The emergy evaluations clearly showed ecological and socioeconomic characteristics of the estuarine areas that act as ecological and economic centers of surrounding areas. River, tide, and rain provided most of the renewable emergy inputs to the estuarine areas with their contribution to the total emergy input less than 8%. The estuarine areas mostly relied for their operation on the purchased emergy which accounted for $92{\sim}98%$ of the total emergy input to the systems. Emergy indices such as emergy use per unit area, population carrying capacity, environmental loading ratio, and emergy sustainability index revealed that the estuarine areas of Yeongsan River, Seomjin River, and Han River are not sustainable at the current level of economic activities in the areas. The ecological economic values of the environment of the areas were in the range of $7.29{\sim}22.06$ million Em\/ha/yr. They are more than twice that for the whole country, indicating the ecological and economic importance of the eatuarine areas. It is, therefore, urgent to establish and implement estuarine management policies to protect and restore the ecological and economic potentials of the estuarine areas of Yeongsan River, Seomjin River, and Han River. Management plans for the estuarine areas should include both demand-side measures such as reduction of population and economic concentration and consideration of ecological carrying capacity in planning stages for utilization and development of the areas, and supply-side ones such as restoration of degraded ecosystems and construction of new productive ecosystems.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2002.10a
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• pp.139-139
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• 2002

금강 하구 연안에서 2001년 4월부터 10월까지 월 2회씩 관측 및 분석한 자료를 가지고, 금강 하구 연안역의 해황과 관련하여 영양염, 부유물질 및 chl-a의 분포 특성을 살펴보았다. 담수 유출이 없을 때에는 금강 하구 연안에서 조석 주기에 따른 수층의 성층과 혼합이 교대로 반복되지만, 담수의 유출이 있을 경우에는 조석 강도에 관계 없이 금강 하구에서 저염수가 표층에 잔존하며 성층을 유지하고 있었다. (중략)

• Korean Journal of Fisheries and Aquatic Sciences
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• v.36 no.2
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• pp.129-135
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• 2003

Species composition and seasonal variations in abundance of fishes in the Nakdong River estuary were investigated using an otter trawl seasonally from September 2001 to July 2002. These data were compared with those obtained before the construction of the estuary barrage in 1987. A total of 3,648 fishes that comprised 30 species in 21 families were collected. Acanthogobius flavimanus and Leiognathus nuchalis predominated, and they were responsible for $71.2\%\;and\;67.8\%$ in the number of individuals and biomass, respectively. The next abundant fish species were Platycephalus indicus and Liparis tanakai. Compared with data obtained before the construction of the estuary barrage in 1987, abundances of Acanthogobius flavimanus, Platycephajus indicus, Liparis tanakai, Tridentiger trigonocephalus and Lateolabrax japonicus increased, while those of Pholis fangi, Repomucenus valenciennei, Sardineila zunasi and Scomber japonicus decreased. These results seems to be related to change of sediment environment caused by irregular discharge of freshwater with variation of sea water movement in the Nakdong River estuary.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2018.11a
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• pp.36-37
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• 2018

낙동강 하구역의 퇴적환경은 육성기원 퇴적물과 해성기원 퇴적물에 따라 다양하고 복잡하게 이루어진다. 낙동강 하굿둑이 건설된 이후의 퇴적환경 특성을 파악하기 위하여 해양공학회(2003)와 수자원공사(2016)의 자료를 수집 분석하였다. 2003년과 2016년의 표층퇴적물 분석결과, 낙동강 하구는 전반적으로 사질퇴적물이 우세하고 분급도가 양호하고 중앙입경 보다 조립질의 퇴적물이 우세하게 분포되는 것으로 나타났다. 기존 연구결과와 금회 연구결과로부터 2003년 이후 낙동강 하구 퇴적환경은 평형상태를 이루고 있는 것으로 판단되며, 낙동강 하굿둑 유출 유사량과 외해측 파랑에 의한 영향이 크게 받고, 창조시의 약화된 유속으로 인하여 니질퇴적물의 이동이 줄어든 것으로 판단된다. 또한, 니질퇴적물이 우세한 구간은 사주와 갯골 부근의 간사지로, 이로 인한 낙동강 하구역의 퇴적우세 현상은 지속될 것으로 판단된다