• Proceedings of the KSRS Conference
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• 2006.03a
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• pp.63-67
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• 2006

본 연구에서는 해안침식이 진행되고 있는 해운대 해수욕장의 장기 해안지형 변화 및 인근지역의 토지피복 변화에 대해 분석하였다. 지난 60여 년간의 항공사진을 이용하여 해안선을 추출하고 이를 수심측량 및 GPS측량 자료를 이용하여 조위보정한 후, 해빈면적을 추출하여 해안지형 변화를 분석하였다. 또한 환경부 토지피복 세분류를 기준으로 하여 육안판독을 통해 13개년도의 토지피복도를 제작하고 토양유실량을 산정하여 연도별 토지피복 변화를 분석하였다. 그 결과, 해운대 해수욕장의 해안선이 점진적으로 후퇴하고 있으며 해수욕장 면적이 전체적으로 감소하고 있는 것으로 나타났다. 춘천천 복개 및 도시개발에 의한 모래 공급원 차단이 이러한 해안침식에 영향을 주는 인위적 원인이라고 사료된다.

• Proceedings of the Korean Association of Geographic Inforamtion Studies Conference
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• 2008.10a
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• pp.173-174
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• 2008

해안 침식이 진행되고 있는 부산 해운대 해수욕장을 중심으로 해수면 상승에 따른 해안선 변화에 대한 분석을 실시하였다. 1947년부터 2008년까지 항공사진을 활용하여 해안선을 추출하였는데 사진촬영시간에 따라 해안선의 위치가 현저히 변화하기 때문에 위치만으로는 비교할 수 없고, 평균적인 해안선 부근의 경사와 촬영시의 조수상태를 고려한 수심별 해빈 면적 산정 공식을 활용하여 해안선 면적을 구하였다. 또한 조위자료를 통하여 40년 동안의 해수면 상승량을 산출하고, 이를 바탕으로 미래의 해안선 후퇴거리를 계산해 보았다. 그 결과 3008년도 해빈 면적은 1947년도와 비교하면 약 29% 면적이 감소하였고, 1992년도에는 일시적으로 해빈 면적이 상승하는데 이는 양빈 사업으로 인한 것으로 이후 다시 감소현상을 보인다. 그리고 조위자료 분석 결과 해수면은 연평균 2.462mm/year의 속도로 상승하였다.

• Magazine of the Korean Society of Agricultural Engineers
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• v.36 no.3
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• pp.144-154
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• 1994

An efficient tidal model, TIDE which is an iterative type, nonlinear finite element model has developed for the analysis of the tidal movement in the coastal area which is characterized by irregular boundaries and bottom topography. Traditional time domain finite element models have been in difficulties with requirement for high eddy viscosity coefficients and small time steps to insure numerical instability. These problems are overcome by operating in the frequency domain with an elaborate grid system by combining the triangular and quadrilateral shape grids. Furthermore, in order to handle non-linearity which will be more significant in the shallow region, an iterative scheme with least square error minimization algorithm has been implemented in the model. The results of TIDE model are agreed with the analytical solutions in a rectangular channel under the condition of tidal waves entering the channel closed at one end.

• Journal of The Geomorphological Association of Korea
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• v.24 no.4
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• pp.117-129
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• 2017

This study is to develop a Geotourism program focused on Taean Haebyeongil course 5 (coastal walkway) and to introduce an explanation board to revitalize an effective Geotourism program of the Taeanhaean National Park. Generally Geotourism program is developed by analyzing topography, geology and cultural resources of the Taean Haebyeongil course 5. An explanation board, which is revitalizing an effective Geotourism program can be used when explaining each trekking courses and providing information about observable geological features to the visitors. This study suggested a new method of explaining geological features and cultural resources to visitors of the Taeanhaean National Park. Additionally, developing a new program of Taean Haebyeongil, is believed to provide a diversity of locational contents to visitors. Hopefully this new program will boost the tourism business of Taean Haebyeongil.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.26 no.5
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• pp.292-299
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• 2014

Since most of the researches on the coastal inundation due to typhoons have considered only storm surges, an additional inundation due to rainfall has been neglected. In general, typhoons are natural disasters being accompanied by the rainfall. Thus, it is essential to consider the effect of rainfall in the numerical simulation of coastal inundation due to storm surges. Because the rainwater is discharged to the sea through the storm sewer system, it should be included in the numerical simulation of storm surges to obtain reasonable results. In this study an algorithm that can deal with the effects of rainfall and sewer system is developed and combined with a conventional storm surge numerical model. To test the present numerical model various numerical simulations are conducted using the simplified topography for the cases including the inundation due to rainfall, the drainage of rainwater, the backflow of sea water, and the increase of sea water level due to drainage of rainwater. As a result, it is confirmed that the basic performance of the present model is satisfactory for various flow situations.

• Journal of the Korean Association of Geographic Information Studies
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• v.21 no.2
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• pp.34-43
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• 2018

DEM(Digital Elevation Model) being fundamental data in geospatial domain is produced from different data and using various methods. As they are derived their precision varies and altering derivative in application. In this work, we compare two widely used DEMs namely(Advanced Land Observing Satellite World 3D 30m and Shuttle Radar Topography Mission Global 30m) around coastal islands in Gyeongsangnam-do, South Korea. First statistics of each DEM were calculated and later overlapped in Landsat image for visual comparison of areas below and above zero-meter elevation. As a result, it was found that DEMs were highly correlated with each other and had similar statistics. Besides having few high differences in hilly land area, they were able to represent the coastal lines. It has also been noted that they have many negative values and should carefully select study area covering full watershed in coastal regions to avoid negative elevation even after filling the sinks.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.31 no.3
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• pp.437-446
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• 1998

The general pattern of the hydrographic conditions and tidal front of the northern coastal area of Cheju Island is investigated using the CTD observation data and a stratification parameter V ($J/m^3$) in $1991\~1993$. 1. The sea water of the northern coastal area of Cheju Island has a lower temperature and higher salinity than that in the central area of the Strait, and local temperature and salinity fronts appears frequently around this area. It seems that they are caused by the upwelling and the tidal front as well as a local topography. 2. A saddle-like distribution of temperature and salinity is formed in the Cheju Strait almost every month with relation to mixing of the different water masses. 3. In the northern coastal area of Cheju Island the stratification parameter V ($J/m^3$) was ranged from 8.4 to 209.8 $J/m^3$ in June, 201.9 to 634.9 $J/m^3$ in August, 0.18 to 680 $J/m^3$ in September, and $2.7\~462\;J/m^3$ in October, respectively. The tidal front was often formed around the place where the horizontal variation of the depth is very large and the potential energy with 10$J/m^3$ appears roughly along 50 m isobath.

• Journal of the Korean Society for Marine Environment & Energy
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• v.5 no.4
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• pp.27-40
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• 2002

The circulation of sea water was simulated by two dimensional tide model using the main four tidal components and permanent current driven by inflow/outflow across open boundaries. According to the residt of tide model, the maximum speed of eastward flow on the Cheju Strait is twice higher than that of westward flow. According to the result of permanent current, the flow of permanent current showing semi-circle pattern in the southern part of Kojedo was due to variation of topography. According to the result of circulation model in the Cheju Strait, eastward flow entering in the southern waters from the Yellow Sea of Korea were dominant, but outflows westward were weak. These results suggest that it was difficult to move for suspended particulate matter into the Yellow sea from the southern waters through Cheju Strait.

• Journal of Environmental Science International
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• v.19 no.1
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• pp.27-37
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• 2010

A system coupled the prognostic WRF mesoscale model and CALMET diagnostic model has been employed for predicting high-resolution wind field over complex coastal area. WRF has three nested grids down to from during two days from 24 August 2007 to 26 August 2007. CALMET simulation is performed using both initial meteorological field from WRF coarsest results and surface boundary condition that is Shuttle Radar Topography Mission (SRTM) 90m topography and Environmental Geographic Information System (EGIS) 30m landuse during same periods above. Four Automatic Weather System (AWS) and a Sonic Detection And Ranging (SODAR) are used to verify modeled wind fields. Horizontal wind fields in CM_100m is not only more complex but better simulated than WRF_1km results at Backwoon and Geumho in which there are shown stagnation, blocking effects and orographically driven winds. Being increased in horizontal grid spacing, CM_100m is well matched with vertically wind profile compared SODAR. This also mentions the importance of high-resolution surface boundary conditions when horizontal grid spacing is increased to produce detailed wind fields over complex terrain features.

• Journal of the Korean Geographical Society
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• v.44 no.1
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• pp.1-16
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• 2009

This study aims to classify climate zones using Empirical Orthogonal Function and clustering analyses considering both air temperature and rainfall features in South Korea. When examining climatic characteristics of air temperature and rainfall by seasons, the distribution of air temperature is affected by topography and latitude for all seasons in South Korea. The distribution of rainfall demonstrated that the Yeongdong area, the southern coastal area and Jeju island have higher rainfall while the central area in Gyeongsangbuk-do is the least rainfall area. Clustering analyses of average linkage method and Ward's method was carried out using input variables derived from principal component scores calculated through Empirical Orthogonal Function analysis for air temperature and rainfall. Ward's method showed the best result of classification of climate zones. It was well reflected effects of topography, latitude, sea, the movement of surface pressure systems, and an administrative district.