• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.24 no.2
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• pp.175-182
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• 2006

The efficient management for minimum losses and demage precautions of fragile region against coastal disasters such as seismic waves and seawater overflows is proceeding continually. This study is to analyze inundation trace and extract expected damage areas with historic records of tsunami using Geographic Information System. Creating a digital elevation model of the Mangsang and the Nobong region in the east coast, we marked inundation record of tsunami and forecasted the flood area with a seismic wave height between 3 m and 5 m. The inundation trace layers and the expected damage areas on the cadastral map layer were superimposed individually. Consequently, the range and lot numbers of inundation expected area were calculated and inundation areas of 5 m tsunami were increased by 2.8 times than 3 m tsunami in case of subject regions. Analyzed results are expected to use evacuation work in case of seismic waves and to predict the compensation of the damaged area. And this study is expected to use suitable countermeasure for prevention from natural disasters.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.31 no.1
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• pp.1-8
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• 2019

This research mainly focuses on examining the applicability of the deterministic model SLOSH (Sea, Lake and Overland Surges from Hurricanes) on Seas covering South Korea. Also, a simple bathtub approach which estimates coastal inundation area is validated as a first step of estimating effects of sea-level rise on the coastal cities of South Korea according to climate change. Firstly, the typhoon-induced surges are obtained from the model SLOSH by adopting historical typhoons MAEMI (0314) and BOLAVEN (1215). The results are compared to observational, typhoon-induced surge heights at several tidal stations. The coastal inundation area is estimated by comparing the maximum envelop of waves (MEOW) and the elevation of coastal land. It reproduces well the inundation area. It can be seen that this research gained applicability for estimating further potential coastal inundation with climate changes.

• Korean Journal of Ecology and Environment
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• v.45 no.1
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• pp.52-61
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• 2012

Distribution, abundance and biomass of submerged macrophytes were assessed using a double-headed rake and an echo-sounder in the Keumpoong Reservoir to investigate the temporal and spatial variations of submerged macrophytes in a small agricultural reservoir located upstream. Slope steepness and water depth in the littoral zone were important controlling factors on flora and vegetation structure of submerged macrophytes. Biodiversity of submerged macrophytes was increased at a gentle slope of the littoral zone. The results of DCA (detrended correspondence analysis) showed that the structure of submerged vegetation depended on the depth of water. Submerged macrophytes were distributed at the maximum water depth of 2.8 m in the Keumpoong Reservoir. The area occupied by the submerged macrophytes was estimated at only 6% of the total reservoir area because of the steep slope of the littoral zone and the large annual water-level fluctuation of 3.5 m. The increase of water level and inflow of turbid water in the rainy season might reduce the biomass of submerged macrophytes in the reservoir. It may be concluded that submerged vegetation in the Keumpoong Reservoir, a small agricultural reservoir located at the upstream, appears to be particularly susceptible to water level fluctuations and slope steepness of the littoral zone.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.28 no.5
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• pp.312-317
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• 2016

The submersion and emersion patterns are key factors that directly influence the habitat environment of the coastal plants and animals. In this study, the coasts are divided into five zones (zones 1, 2, 3, 4, and 5 - not flooded, flooded once, flooded and exposed to air twice, exposed to air once, continuously flooded in the day, respectively) based on the patterns using tidal elevation data at the major eight stations and the domestic and international reference tidal levels, i.e., AHHW, ALLW, HAT and LAT, are also estimated to analyse the characteristics of the five distinct zones. Based on the results, the frequency of the zone 3 are dominant and forms from 87.2% to 88.2% (nearly constant) irrelevant with the tidal ranges at all stations. The taking-up percentages of the zones 2 and 4 show nearly constant, below 4% and over 8%, respectively. In Pohang station classified as the mainly diurnal tide, the percentages are decreased to 1.4% in zone 2 and increased to 10.8% due to the effects of the annual and semi-annual tidal components.

• Journal of the Korean Society of Marine Environment & Safety
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• v.26 no.7
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• pp.881-891
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• 2020

In recent years, large-scale development of coastal areas has caused the loss of many lives and extensive property damage in coastal areas, due to wave overtopping caused by high-wave invasion and strong typhoons. However, coastal inundation studies considering the characteristics of domestic coastal areas are insufficient. This study is a methodology study that aimed to reproduce inundation of surge and wave complex elements by applying the ADCSWAN (ADCIRC+SWAN) and FLOW-3D models. In this study, the boundary data (sea level, wave) of the FLOW-3D model was extracted using the ADCSWAN (ADCIRC+SWAN) model and applied as the input value of the FLOW-3D model and a reproduction was created of the Flooding due to surge and overtopping in Busan Marine City when the typhoon Chaba passed. In addition, the existing overtopping empirical equation and the overtopping calculated by the FLOW-3D model were compared, and for coastal inundation, a qualitative verification was performed using the Inundation Trace Map of Land and Geospatial Informatrix Corporation, and the effectiveness of this study was reviewed.

• Journal of Korea Water Resources Association
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• v.43 no.11
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• pp.985-994
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• 2010

Typoon Maemi landed on the southern coast of Korean Peninsula at 21:00, September 12, 2003 with a central pressure of 950 hPa. A three dimensional (3D) inundation model was established to calculate the storm surge and flooded area due to Typoon Maemi. A field survey of storm surge traces in Masan City was carried out to evaluate the inundation water depth. Hydromet-Rankin Vortex model was used to calculate the atmospheric pressure and the surface wind fields. The inundation area, storm surge and typoon-induced current were calculated using the 3D model. The peak of computed storm surge in Masan Port using the 3D model was 238 cm, and the observed peak was 230 cm. The simulated storm surge and the inundation area showed good agreement with field survey data. The comparison of the 3D and the two dimensional (2D) models of storm surge was carried out, and the 3D model was more accurate. The computed typoon-induced currents in the surface layer of Masan Bay went into the inner bay with 30~60 cm/s, while the currents in the bottom layer flowed out with 20~40 cm/s.

• Proceedings of the Korea Water Resources Association Conference
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• 2005.05b
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• pp.163-167
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• 2005

하천변 저지대를 HEC-RAS의 저류지(Storage) 기능을 사용하여 모형화 하고 자연배수시설과 배수펌프장을 모의할 수 있는 기능에 의해 하도와 연결한 후 1차원 부정류해석을 수행하였다. 그 결과 유역에서 저지대로 유입한 홍수량과 저지대에서 하천으로 배제되는 홍수량의 차이를 산정하여 내수침수를 유발하는 저류량과 침수위을 결정할 수 있었으며, 이렇게 결정된 저류지의 시간대별 침수위를 저지대의 표고와 비교함으로써 침수지역을 식별하고 침수심별로 상이한 형태의 시각정보로 변환하여 시간대별 침수심별 예상침수지도를 작성하였다. 본 모형을 삽교천 유역에 적용한 결과 실제 발생한 홍수사상의 특성을 잘 재현하여 상기한 정보들이 충분한 활용가치가 있는 것으로 평가되었다.

• Proceedings of the Korea Water Resources Association Conference
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• 2005.05b
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• pp.168-172
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• 2005

내수침수로 인한 수해가 빈번하게 발생하고 있는 삽교천 유역 중하류부를 대상으로 하구에 위치한 삽교호와 유역에서 유일하게 홍수조절 기능을 갖춘 예당지가 이 지역의 침수특성에 미치는 영향을 분석하였다. 아울러 신속한 홍수배제와 홍수유출량 저감을 목적으로 삽교호 배수갑문을 증설하고, 예당지를 증고하여 홍수조절 용량을 확장하였을 경우의 효과를 침수면적, 침수시간, 연평균피해경감기대액 등 다양한 기준에 의해 검토하였다. 그 결과 내수침수 저감을 목표로 할 경우 외수범람방어 위주의 기존 치수계획과는 차별되어야 하는 요소를 확인할 수 있었고, 사업대상지역 및 치수계획의 목표에 적합한 대안을 선정하는데 필요한 각 홍수방어대안의 특성을 파악할 수 있었다.

• Proceedings of the Korea Water Resources Association Conference
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• 2016.05a
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• pp.343-343
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• 2016

기후변화에 따라 우리나라는 연안에 근접한 도시들에서 반복적으로 침수에 의한 재산 및 인명 피해가 나타나고 있다. 이러한 침수에는 크게 3가지 요인이 존재한다. 첫 번째는, 높은 강도의 폭우가 발생하고 증가와 펌프, 우수관 등의 불량으로 인하여 물이 하천으로 배수되지 못하는 내수침수이다. 두 번째는, 설계빈도를 넘는 수위가 발생하여 제방의 부실 등으로 하천이 월류하게 되는 외수범람이 있다. 마지막으로는 해수위가 상승하여 발생하는 해수침수이다. 본 연구에서는 내수침수와 외수범람에 의한 복합적인 침수해석을 하고자 한다. 기존의 연구에서는 각각의 범람요인들에 대해 독립적인 해석으로 개별적인 침수예상도가 산출되었다. 이렇게 개별 선정한 결과를 선형합으로 중첩하는 방법론의 오류 및 부적합성을 검토하고자 한다. HDM-2D(Song. 2011) 모델을 이용하여 내수침수와 외수범람을 복합적으로 모의하고 그 영향을 고려하고자 한다. ERG (Exponentially Growth Rate) 기법에 의한 생성/소멸 기작은 내수침수 해석 모듈에 적용되고 ERG항의 생성도를 범위를 변화시켜서 침수에 대한 민감도를 분석한다. 이를 통해 도시에서의 표고와 수위를 비교하여 침수지역과 비침수지역을 구분하여 침수구역 산정의 정확성을 향상시킨다. 차후에는 내수침수와 외수범람의 개별적인 모의를 통하여 개별 산정한 침수해석값과 복합요인에 의한 침수해석값을 비교하고자 한다.

• 한국HCI학회:학술대회논문집
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• 2009.02a
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• pp.611-614
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• 2009

Understanding the severity of the typhoon-induced storm-surge helps in planning reaction and in preventing further disaster. Natural disasters due to the storm-surge are predictable from accurate observations and forecasts from numerical simulations. What we can do is to make intelligent effort to minimize the loss due to the disaster to the most extent with the technology of early warning, forecast and prevention activity. In this paper, we propose the design of GIS-based Web Service System to visualize the time-varying storm-surge's height and wind field data effectively with 3 different kinds of resolution for predict and prevent storm-surge disasters. This system is one of the efforts to provide the storm-surge forecast service to general public and share two-way more helpful information to coastal resident through the Internet.