• Korean Journal of Fisheries and Aquatic Sciences
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• v.34 no.3
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• pp.268-278
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• 2001

To investigate sedimentary facies and environmental changes of the Nakdong River Estuary and its adjacent coastal area, the grain size analysis and measurement of organic matter, calcium carbonate, clay mineral and metallic elements were carried out for forty surface sediment samples. Based on regional distribution pattern and characteristics of the surface sediments, sedimentary facies in the study area can be divided into sand facies (TYPE I), mud facies (TYPE II) and sand-mud mixed facies (TYPE III). TYPE III is the transition of TYPE I and TYPE II in every aspects of sediment characteristics. It suggests that TYPE III may have been formed by the mixture of two different source of sediment : one derived from Nakdong River and the other resuspended fine-grained sediments from the Jinhae Bay by winnowing action during floods or storms. Among many aspects of environmental change after the construction of the Nakdong Barrage, the most significant is the increase of sand content off the sand barrier region. It could be explained by several reasons including decreased input of fine-grained sediment from river, increased hydrodynamic energy level off the sand barrier region and artificial effects such as dredging and dumping.

• Journal of the Korean Society of Marine Environment & Safety
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• v.22 no.2
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• pp.187-194
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• 2016

In this paper, as a basic research for the restoration and construction of easuary saltmarsh, To observe the habitat environment for reed, we observed sediment environment (Particle size, water content, pH, nutrient analysis ($NH_4-N$, $PO_4-P$)), ground water level, ground level, individual numbers of reed, maximum reed height. As a result of this study, sediment particle size and moisture content of soil on the study area not effected reed habitat, pH showed no difference in each site. $NH_4-N$ and $PO_4-P$ concentration also no difference in each site. Ground level of reed habitat area is more higher than none reed habitat. However Ground water level of reed habitat area is more lower than none reed habitat. As a results of analyzing the influence factors for reed habitat in Nakdong estuary saltmarsh, ground water level and ground level is most influenced factor for reed habitat.

• Proceedings of the Korea Water Resources Association Conference
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• 2008.05a
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• pp.1703-1707
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• 2008

유역 토지이용의 변화와 골재 채취, 댐과 저수지의 건설등과 같은 인위적인 요인들은 하천의 평형 상태를 파괴하고 유사이송 문제 및 하상변화등과 같은 문제점을 야기 시킨다. 본연구의 대상하천인 낙동강 하류에는 낙동강 하구둑 건설로 인해 상류로부터 유입되는 유사가 하구둑 상류에 퇴적되는 문제가 발생하고 있으며 매년 상류 수로의 홍수 통수력을 확보하기 위해 준설 작업이 수행되고 있다. 한편 다른 대상하천인 탄천은 최근 들어 분당 신도시를 중심으로 주변의 수지, 구성, 죽전지구 등 상류유역에 대규모 택지지구가 건설됨에 따라 유역의 지형학적, 수문학적 변화가 많이 발생하고 있으며 이러한 변화는 평형상태인 자연하천에서의 하상변동 및 지형학적 변화에 많은 영향을 끼칠 것으로 사료된다. 본 연구에서는 이러한 대표적인 두 대상하천에 대해 HEC-6 모형을 이용하여 하상변동과 지형학적 변화를 예측하고 분석하였다.

• Proceedings of the Korea Water Resources Association Conference
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• 2009.05a
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• pp.734-739
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• 2009

낙동강하구둑은 바다로부터의 염수칩입을 방지하고 하구둑 상류의 지속적인 용수 공급을 위해 1987년에 건설되었으며 이로 인해 낙동강 상류로부터 유입되는 유사가 낙동강하구둑 근처에서의 유속 감소로 인해 상류 접근수로에 퇴적되는 문제가 발생하고 있다. 이러한 낙동강하구둑 상류의 퇴적되는 유사로 인해 낙동강하류의 하상이 상승되고 통수단면이 축소되는 현상이 발생할 수 있으며 이는 홍수범람의 위험성을 가중 시키는 원인이 될 수 있다. 따라서 매년 하구둑 상류 접근수로에서는 퇴적되는 유사를 제거하기 위해 하구둑 건설 이후에 매년 준설 작업이 수행되고 있으며 최근에 이를 대체할 수 있는 여러 방법들이 여러 연구를 통해 검토되고 있는 실정이다. 특히 하폭이 급격하게 증가하는 하구둑 상류 2 km 지점은 매년 준설 작업 전에 시행되는 측량 자료에 의하면 이 지점에 많은 양의 유사가 퇴적되는 것으로 나타났다. 따라서 낙동강하구둑 접근수로에서 매년 준설되는 퇴사를 하구둑 상류 2 km 지점 우안 쪽을 매립함으로써 하도를 인위적으로 축소시켜 유속을 증가시키고 결과적으로 퇴사량을 경감 시킬 수 있을 것으로 예측된다. 이러한 하도 축소를 이용한 퇴사 저감 방법의 적용성 검토를 위해 2차원 수치모형인 RMA2 모형과 SED2D 모형을 이용하여 흐름 및 하상변동 분석하였다.

• The Journal of the Korea institute of electronic communication sciences
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• v.10 no.6
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• pp.729-736
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• 2015

In this study, It was analyzed to estimate the origin from the collected disposable lighters with the printed company name and telephone number on the surface. Monitoring was done bimonthly from 2 areas of sandbar Coastline of Nakdong River Estuary(Jinu-do, Shinja-do) and 3 areas(Doomo beach, Heungnam beach, Yeocha beach) of Northeastern coast of Geoje-do. As a result of the monitoring, there were 166 lighters collected. Then, the monthly occurrence amount was concentrated in Jun, August. The origin of Disposable lighters that flowed in study area were mostly cause to the Nakdong River basin region and the coastal area where population densities are high.

• Journal of the Korean Association of Geographic Information Studies
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• v.2 no.3
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• pp.1-15
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• 1999

This study was carried out to find out the way to build a comprehensive wetland ecosystem database using the technique of remote sensing and geographic information system. A Landsat TM image taken in May 17, 1997 was used for the primary source for the image analysis. Field surveys were conducted March to September of 1998 to help image analysis and examine the results. An actual wetland vegetation map was created based on the field survey. A Landsat TM image was analyzed by unsupervised and supervised classification methods and finally categorized into such 5 classes as Phragmites australis community, mixed community, sand beach, Scirpus trigueter community and non-vegetation intertidal area. Wetland basemap was developed for the overall accuracy assesment in wetland mapping. Vegetation index map of wetland vegetation was developed using NDVI(normalized difference vegetation index). The map of wetland productivity was developed based on the productivity of Phragmites australis and the relationship to the proximity of adjacent water bodies. The map of potential vegetation succession map was also developed based on the experience and knowledge of the field biologists. Considering these results, it is possible to use the remote sensing and GIS techniques for producing wetland ecosystem database. This study indicated that these techniques are very effective for the development of the national wetland inventory in Korea.

• Journal of the Korean Society of Marine Environment & Safety
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• v.16 no.2
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• pp.169-174
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• 2010

To obtain more accurate meteorological data for analyzing the river discharge characteristics at the Nakdong River Estuary, we investigated the characteristics of the release barrage discharge observed during the 13-year period from 1996 to 2008 and calculated the differences using meteorological data for the Busan and Gimhae weather stations. The river discharge estimated using a tank model was compared to the real river barrage discharge. We discussed the correlation between the discharge and the meteorological factors that affected the estuary water environment. This study found that total annual discharge from the Nakdong river basin for the 13 years was $272,653.3{\times}10^6\;m^3$/month. The largest monthly mean release discharge occurred in July at $73,212.9{\times}10^6\;m^3$/month (26.9% for the year), followed by August and September in that order with 22.0% and 18.9%, respectively.

• Water for future
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• v.54 no.9
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• pp.18-28
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• 2021

• Water for future
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• v.55 no.12
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• pp.65-72
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• 2022

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.34 no.5
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• pp.457-469
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• 2016

Nakdong river barrage was affected by artificial interference such as construction of port, industrial complex and estuary barrage. This change in Nadong river lead to environmental changes and affected the ability of barrier islands. Therefore, it is decided that the observation of changes in the Nakdong river estuary is very important. In this paper, the topographic change of the Nakdong river barrage observe based on Landsat TM, ETM+ images from 1984 to 2015. In addition, this study tried to conduct a comparative analysis on the area for change of sandy sediment according to tide level. This results could estimate height and volume about sandy sediment accumulated on the lower sand dune. Also, these results are expected to be the basis for prediction of the changing topography of the sand dune. The area of the average change in region 1,2,3 was calculated as 3,015m², 167,550m², 14,596m². This result is expected to be very useful for the continuous observation for sediment changes of Nakdong river.