• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
• /
• v.7 no.1
• /
• pp.19-26
• /
• 1989

The quantification of phenomena presented by the shoreline changes and the prediction of future changes of shoreline are investigated by using a numerical model in this study. Shoreline has been sucessively affected by the activities of reclamation to maximize the land use and it also has been changed with cycles of accumulation and erosion of deposits. Many researches were performed on the jetties constructed to protect facilities adjacent to the shore. However, few studies on a seawall of protecting the beach, being very important in terms of land use, were carried out. Therefore, this study is to analyze effects of a straight seawall to shoreline changes.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
• /
• v.20 no.2
• /
• pp.207-214
• /
• 2002

Development of the shore in western sea is decreasing of silt and is threatening sea ecosystem. Large size land-reclamation work by industralization have caused weather changes and sea changes, and have generated much changes topography of sea bottom and coastline. Also, It is influencing to route of ship. In this research, line for 0 m, 2 m, and coastline of land portion is digitalized. It is divided in four block, and is analyzed severally to know the degree of coastal changes by new airport construction, new town construction, and tide embankment construction.

• Journal of the Korean Society of Environmental Restoration Technology
• /
• v.3 no.2
• /
• pp.75-97
• /
• 2000

우리 학회에서는 최근에 폐탄광지 복구에 관한 관심이 고조되고 있으며, 특히 금년내 적당한 시기에, 되도록 빠른 시일 안에 폐탄광지 복구에 관한 국제 심포지엄을 개최할 계획을 가지고 있으나, 아직 학회 설립이후 이 분야에 관한 연구활동이 다소 일천하므로 기초자료준비가 미진한 상태에 있는 현실이다. 이러한 현실적인 상황하에서 필자는 학회의 회장으로서 학회와 회원들의 연구활동지원을 위한 기초적인 자료라도 수집 제공해야 되겠다는 취지를 가지고 이런 저런 일을 진행하고 있다. 이와 같은 학회활동의 하나로 우선 지난 5월 15일부터 20일까지 중국 북경시 신대도(新大都)호텔에서 중국토지학회(中國土地學會) 중국토지부간학회(中國土地復墾學會) 주최로 개최된 "북경 국제토지부간학술연토회(北京 國際土地復墾學術硏討會)" 심포지엄(Beijing International Symposium on Land Reclamation ISLR 2000 - Mine Land Reclamation and Ecological Restoration for 21st Century)에 참석하여 국제적인 상황을 파악할 수 있도록 한 바 있다. 또한 한국의 "폐탄광지역의 산림훼손지 복구 및 폐석유실 방지대책에 관한 고찰" 원고를 우리 학회지에 투고 게재하여 우리 나라의 폐탄광지 복구에 대한 현황을 개략적으로 이해할 수 있도록 하고저 한다. 이와 같은 일을 하다보니, 우리 학회에서도 석탄광산에 관한 전문용어를 파악해야 되겠다는 필요성에 따라서 우선 필자가 가지고 있는 제반 용어자료(참고문헌 제시)를 종합적으로 정리하여 이 용어집을 발표하고자 한다. 이 "소고(小考)" 용어집은 시기적으로 우리 학회 회원들의 필요성에 의해서 편집된 "초고(草稿)" 수준이며, 약 860 용어가 영문 국문(ABC순)/국문 영문(ㄱㄴㄷ순)으로 편집되었다. 이 용어집은 장차 우리 학회에서 용어제정의 기회가 있을 때에는 귀중한 표준 자료로 활용될 수 있을 것이다. 따라서 이 용어집은 우리 학회 제정 표준용어집이 아니라 단순히 필자의 연구자료(안)로 보아야 할 것이다.

• Korean Journal of Remote Sensing
• /
• v.29 no.1
• /
• pp.57-68
• /
• 2013

Large-scale coastal construction projects, such as land reclamation and dykes, were constructed from the late twentieth century in Yoobu-Do region. Land reclamation combined with the dynamics of tidal currents may have accelerated local sedimentation and erosion resulting in rapid reformation of coastal topography. This study presents the results of the topography changes around Yoobu-Do by large-scale coastal constructions using time-series waterline extraction technique of Landsat TM/ETM+ data acquired from 1998 to 2012. Furthermore, the Freeman-Durden decomposition was applied to fully polarimetric RADARSAT-2 SAR data in order to analyze the scattering mechanisms of the deposited surface. According to the case study, the deposition areas were over 4.5 $km^2$ and distributed in the east, northeast, and west of Yoobu-Do. In the eastern deposition area, it was found that the scattering mechanism was difference from other deposition areas possibly indicating that different types of soil were deposited.

• Journal of the Korean Geographical Society
• /
• v.38 no.4
• /
• pp.535-561
• /
• 2003

The Kyodong Island on the Yellow Sea has experienced dramatic transformations in the process of massive reclamations of tidal flats. Consisting originally of detached several islets, Kyodong became an integrated island country with the establishment of sea dikes across the salt marshes. The coastal plaines passed through four distinct stages of development. During the nascent period from the Early States to the Koryo Dynasty, strategic considerations led up to the establishment of causeways and garrison farms as well as private land plots. The relocation of regional headquarters of the navy into the island made the reclamation of tidal flats a systematic project during the period of Chosun Korea. The implantation of a large-scale estate by Japanese capitalists was the most characteristic feature of this region's geography during the colonial period. Present-day Kyodong displays various agrarian landscapes of standardized land plots, reinforced sea dikes, and automated agricultural machinery. Throughout the periods irrigation systems have sustained the panoramic transformation of the agricultural geographies of the Kyodong Island. The local people afflicted by a chronic deficiency of water came up with ingenuous irrigation systems such as springs, paddy reservoirs, reservoirs, tanks, artesian wells, and pump stations.

• Proceedings of the KSRS Conference
• /
• 2007.10a
• /
• pp.22-24
• /
• 2007

Waterline extraction is the one of widely used methods for studying changes in tidal flat environment and coastlines using multi-temporal optical images such as Landsat TM and Landsat ETM+. High dynamics of tidal currents and land reclamation which accelerate sedimentation and/or erosion cause waterline change in tidal flats. The amount of sediment deposited or eroded can be evaluated by precisely estimating waterline changes in tidal flats. The objective of this study is to detect the change of waterlines during 17 years and analyze the trends of erosion and sedimentation in the study areas. The Ganghwado tidal flat on the west coast of the Korean Peninsula was selected. The study area is famous for high dynamics of tidal currents and vast tidal flats. Land reclamation which has been carried out on a large scale is also considered as one of elements that have accelerated the environmental changes in this tidal flat. In this study, we acquired 26 waterlines from Landsat TM and Landsat ETM+ images. We extracted the waterline from each satellite image to generate a digital elevation map (DEM) which was used for reference and to compare with the other waterline which was extracted from DEM having a same tide. The result of comparison well depicted the areas of dominant sedimentation and erosion, and general trends of sedimentation and erosion according to sub-regions are also revealed during the investigation time. Results showed that erosion during a decade was dominant at the west of the Southern Ganghwado tidal flat, while sedimentation was dominant at the wide channel between the Southern Ganghwado tidal flat and the Yeongjongdo tidal flat. This area has been commonly affected by high currents and sedimentation energy. Although we were not able to verify the accuracy of the waterline changes, this result clearly showed the waterline change and therefore, the waterline extraction method used in this study has proven as an effective tool for long term tidal change estimation.

• Journal of The Korean Society of Agricultural Engineers
• /
• v.56 no.5
• /
• pp.67-75
• /
• 2014

In this study, the large-scale hydraulic model test was performed to investigate the hydraulic characteristics for development of the non-power soil cleaning and keeping system at the dike gate. The outlet height, outflow number, outflow discharge, and outflow cycle were compared and analyzed. The non-power soil cleaning and keeping system was most effective at 11.2 mm in the outlet height. And then the mean outflow cycle was 1.09 sec, and the mean outflow discharge was $0.00164m^3/s$. The total outflow number increased gradually as the water level of a water tank increased, and the outlet height decreased. As a level of water tank decreased, the mean outflow cycle was lengthened, and the unit outflow discharge increased. This result showed this system was most effective. To remove the silty clay deposited in facilities, the methods of excavation, dredging, high pressure washing, etc have been applied to the tidal facilities such as land reclamation, a small size fishing port, and a harbor for maintenance. However, this is extremely cost-ineffective, whereas the non-power soil cleaning and keeping system will bring about an enormously positive economic effect. In addition, when the non-power soil cleaning and keeping system is applied to the dike gate of land reclamation, a thorough examination of the local tidal data and the careful system planning are required to prevent the disaster damage caused by flooding.

• Journal of Korea Foresty Energy
• /
• v.23 no.2
• /
• pp.29-33
• /
• 2004

This study was carried out to find out safety disposal methods of waste CCA treated wood. The heavy metals of remnant were analyzed after combustion of CCA treated wood at different temperatures. Arsenic volatilized temperature was detected. The removal rate of heavy metals by acid in the ash were examined. Through this study, we could conclude that in order to protect volatilize arsenic, combustion of CCA treated wood should be do under the $300^{\circ}C$. But when CCA treated wood combustion under $300^{\circ}C$, it's weight-loss rate was $55\%$, so land reclamation dependence will be increased. When CCA treated wood combustion at high temperature, the land reclamation dependence could be reduced, but the arsenic that volatilize into the atmosphere should be captured. When it bums with high temperature, the ash contains lots of copper and chromium, so removal of heavy metals should be conducted.

• Proceedings of the Korean Geotechical Society Conference
• /
• 2009.09a
• /
• pp.157-171
• /
• 2009

A 151 storey super high-rise building located in an area of reclaimed land constructed over soft marine clay in Songdo, Korea is currently under design. This paper describes the design process of the foundation system of the supertall tower, which is required to support the large building vertical and lateral loads and to restrain the horizontal displacement due to wind and seismic forces. The behaviour of the foundation system due to these loads and foundation stiffness influence the design of the building super structure, displacement of the tower, as well as the raft foundation design. Therefore, the design takes in account the interactions between soil, foundation and super structure, so as to achieve a safe and efficient building performance. The site lies entirely within an area of reclamation underlain by up to 20m of soft to firm marine silty clay, which overlies residual soil and a profile of weathered rock. The nature of the foundation rock materials are highly complex and are interpreted as possible roof pendant metamorphic rocks, which within about 50m from the surface have been affected by weathering which has reduced their strength. The presence of closely spaced joints, sheared and crushed zones within the rock has resulted in deeper areas of weathering of over 80m present within the building footprint. The foundation design process described includes the initial stages of geotechnical site characterization using the results of investigation boreholes and geotechnical parameter selection, and a series of detailed two- and three-dimensional numerical analysis for the Tower foundation comprising over 172 bored piles of varying length. The effect of the overall foundation stiffness and rotation under wind and seismic load is also discussed since the foundation rotation has a direct impact on the overall displacement of the tower.

• Journal of Soil and Groundwater Environment
• /
• v.18 no.5
• /
• pp.56-64
• /
• 2013

After the law has been enacted for the prevention and recovery of mining damage in 2005, efforts of remediation have been started to recover heavy metal contaminated soils in agricultural land near mining sites. As part of an effort, the upper part of cultivation layer has been treated through covering up with clean soil, but the heavy metal contamination could be still spreaded to the surrounding areas because heavy metals may be remained in the lower part of cultivation layers. In this study, the most frequently occurring arsenic (As) contamination was selected to study in agricultural land nearby an abandoned metal mining site. We applied separation technologies considering the differences in the physical characteristics of soil particles (particle size, density, magnetic properties, hydrophobicity, etc.). Based on physical and chemical properties of arsenic (As) containing particles in agricultural lands nearby mining sites, we applied sieve separation, specific gravity separation, magnetic separation, and flotation separation to remove arsenic (As)-containing particles in the contaminated soil. Results of this study show that the removal efficiency of arsenic (As) were higher in the order of the magnetic separation, flotation separation, specific gravity separation and sieve separation.