• 대한공간정보학회지
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• 제24권2호
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• pp.95-106
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• 2016

Landslide is one of the natural hazards, triggered by rainfall or earthquake and it leads to damage and loss of properties and lives especially in hilly and mountainous regions. Inventory maps of the area is of much importance in order to understand the landslide phenomena in detail, conduct further studies on landslide, prepare susceptibility map and minimize risk. Inventory maps of landslides can be constructed by several methods, using multiple images through visual interpretation, using algorithms in multi-spectral or SAR images or verification from field investigation. The possible methods were explored for Sindhupalchowk district of Nepal, which was struck by massive earthquake on 2015 and landslide inventory was prepared. The inventory was analyzed for its frequency over elevation, slope aspect and dominant soil classes and also the information value for their occurrence probability.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.141-143
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• 2003

The aim of this study is to evaluate the susceptibility of landslides at Clicap area, Indonesia , using a Geographic Information System (GIS). Landslide locations were identified from field surveys. The topographic and geological map were collected and constructed into a spatial database using GIS. The factors that influence landslide occurrence, such as slope, aspect and curvature of topography, were calculated from the topographic database and lihology and fault was extracted from the geological database. Then landslide susceptibility was analyzed using the landslide-occurrence factors by likelihood methods. The results of the analysis were verified using the landslide location data. The GIS was used to analyze the vast amount of data efficiently . The results can be used to reduce associated hazards, and to plan land use and construction.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2016년도 학술발표회
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• pp.196-196
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• 2016

Landslide dam failure presents as a severe natural disaster due to its adverse impact to people and property. If the landslide dams failed, the discharge of a huge volume of both water and sediment could result in a catastrophic flood in the downstream area. In most of previous studies, breaching process used to be considered as a constructed dam, rather than as a landslide dam. Their erosion rate was assumed to relate to discharge by a sediment transport equation. However, during surface erosion of landslide dam, the sediment transportation regime is greatly dependent on the slope surface and the sediment concentration in the flow. This study aims to accurately simulate the outflow hydrograph caused by landslide dam by overtopping through a 2D surface flow erosion/deposition model. The lateral erosion velocity in this model was presented as a function of the shear stress on the side wall. The simulated results were then compared and it was coherent with the results obtained from the experiments.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2002년도 봄 학술발표회 논문집
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• pp.517-522
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• 2002

This study was carried out to understand the cause and processes of a reactivated landslide that occurred in Gonmyeong-myeon, Sacheon City, Kyeongsangnam-do. For the study, geologic mapping, geophysical exploration, boring, laboratory testing, and slope stability analyses were conducted. The landslide area has geologic conditions that are prone to slope failure, due to the past landslide. The trigger that caused the landslide was removal of lateral support by excavation of the toe of slopes.

• 한국방재학회:학술대회논문집
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• 한국방재학회 2008년도 정기총회 및 학술발표대회
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• pp.645-648
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• 2008

This study provides considerations for quantitative risk assessment of landslide on GIS technology. It shows how the landslide possibility analysis is linked by GIS modeling to provide loss estimation tools for landslide hazards in support of socio-economic loss reduction efforts. Those risk assessment results can deliver factual damage situation prediction to policy making for the landslide damage mitigation.

• Spatial Information Research
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• 제4권1호
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• pp.83-92
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• 1996

자연재해중 인간에게 엄청난 피해를 입히는 산사태의 활동성분석을 위해서는 일차적으로 항공사진으로부터 추출되는 산사태 발생지역과 규모(Landslide deposits)들에 대한 정량적인 분석접근이 필요하다. GIS 를 이용하여 서천 및 보령지역을 대상으로 실시된 산사태 발생지역들의 등치선 작도기법(Isopleth mapping)은 도시 및 주변 지역들에 대하여 산사태 활동성분석을 아주 효과적으로 수행할 수 있게 하였다. 연구지역의 축척 1:15,000항공사진을 이용하여 작성된 13년 간격(1978년, 1991년)의 산사태발생 분포도는 대상지역에 대한 산사태 활동성분석은 물론 산사태에 의한 위험 평가(Hazard assessment)를 가능하게 하였다. 또한 GIS는 산사태발생에 영향을 미치는 환경지질학적 요소(지형, 지질, 토양 등)들을 통일된 시스템하에서 정량적으로 분석할 수 있게 하였으며, 다양한 지도모형연구에 의한 자료처리를 수행할 수 있게 하였다. 이러한 연구는 앞으로 국가 방재사업과 효과적인 도시계획 등을 위해서 점차 전국토로 확대할 필요가 있을 것으로 생각된다.

• 산업기술연구
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• 제28권A호
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• pp.3-10
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• 2008

This paper is to investigate the characteristics of debris flow landslides in Gangwon Province through literature review, data collection and analyses and site investigation. As results of data analyses about landslides occurred currently in this province, the landslide in the form of debris flow is found to be 55 %. Therefore major loss and costs are caused by discharge of soil and rock fragments from landslide. From results of analyzing the geometrical characteristics of landslide, length of most of landslide is less than 200 m, their width is in the range of 10 - 40 m, most of them are know to be occurred in lower elevation than 400 m. Slope angle is in the range of 25 - 35 degrees. Comparing the period of rainfall intensity with the time of landslide being occurred, occurrence of landslide is quite related to duration of a heavy rainfall. For measures of controlling water flow discharge and debris flow, considering geological and topographical ground conditions, appropriate selection and building check dam, erosion control dam and ring net is very beneficial for reducing the loss and costs caused by the landslide of debris flow.

• 환경영향평가
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• 제15권6호
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• pp.373-383
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• 2006

The spatial mapping of risk is very useful data in planning for disaster preparedness. This research presents a methodology for making the landslide life risk map in the Boeun area which had considerable landslide damage following heavy rain in August, 1998. We have developed a three-stage procedure in spatial data analysis not only to estimate the probability of the occurrence of the natural hazardous events but also to evaluate the uncertainty of the estimators of that probability. The three-stage procedure consists of: (i)construction of a hazard prediction map of "future" hazardous events; (ii) validation of prediction results and estimation of the probability of occurrence for each predicted hazard level; and (iii) generation of risk maps with the introduction of human life factors representing assumed or established vulnerability levels by combining the prediction map in the first stage and the estimated probabilities in the second stage with human life data. The significance of the landslide susceptibility map was evaluated by computing a prediction rate curve. It is used that the Bayesian prediction model and the case study results (the landslide susceptibility map and prediction rate curve) can be prepared for prevention of future landslide life risk map. Data from the Bayesian model-based landslide susceptibility map and prediction ratio curves were used together with human rife data to draft future landslide life risk maps. Results reveal that individual pixels had low risks, but the total risk death toll was estimated at 3.14 people. In particular, the dangerous areas involving an estimated 1/100 people were shown to have the highest risk among all research-target areas. Three people were killed in this area when landslides occurred in 1998. Thus, this risk map can deliver factual damage situation prediction to policy decision-makers, and subsequently can be used as useful data in preventing disasters. In particular, drafting of maps on landslide risk in various steps will enable one to forecast the occurrence of disasters.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2002년도 가을 학술발표회 논문집
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• pp.499-506
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• 2002

The purpose of this study is to develop landslide susceptibility analysis techniques using artificial neural networks and to apply the newly developed techniques for assessment of landslide susceptibility to the study area of Yongin in Korea. Landslide locations were identified in the study area from interpretation of aerial Photographs and field survey data, and a spatial database of the topography, soil type and timber cover were constructed. The landslide-related factors such as topographic slope, topographic curvature, soil texture, soil drainage, soil effective thickness, timber age, and timber diameter were extracted from the spatial database. Using those factors, landslide susceptibility and weights of each factor were analyzed by two artificial neural network methods. In the first method, the landslide susceptibility index was calculated by the back propagation method, which is a type of artificial neural network method. Then, the susceptibility map was made with a GIS program. The results of the landslide susceptibility analysis were verified using landslide location data. The verification results show satisfactory agreement between the susceptibility index and existing landslide location data. In the second method, weights of each factor were determinated. The weights, relative importance of each factor, were calculated using importance-free characteristics method of artificial neural networks.

• 한국재난정보학회 논문집
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• 제9권4호
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• pp.503-510
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• 2013

최근 기후변화로 국지성 집중호우가 증가하고 있으며 이로 인한 산사태 발생도 증가하고 있는 추세이다. 또한 도시주거지역에서 발생한 산사태로 인하여 인명 및 재산피해가 증가하고 있다. 그러나 이러한 산사태를 대비하기 위한 표준매뉴얼은 작성되어 있지 않으며, 산림청에서 작성한 예방 대응 행동매뉴얼도 미흡한 실정이다. 이에 본 논문에서는 산사태 발생 및 피해 특징을 알아보고 방재 관련 전문가들을 대상으로 산사태 대비 SOP 작성을 위해 산사태 SOP 필요도와 활용도를 조사하였으며 활용 시 문제점을 알아보았다. 또한 산사태 주요 세부항목의 중요도를 알아보고, 산사태 SOP 활용을 위한 요구사항을 조사하였다. 조사결과는 대부분의 전문가들이 산사태 SOP의 필요도는 높다고 응답하였으나 활용도는 낮았으며 산사태 SOP 활용시의 문제점은 다양한 피해상황의 미반영과 기관의 역할별 재난관리 단계별 규정의 어려움이 나타났다. 또한 산사태 SOP 작성 시 주요 세부항목 중요도에서는 산사태 발생에 따른 비상대응계획, 대피 및 행동요령에 대한 지침, 산사태 재난 대비 훈련 및 교육, 산사태 재난 방송 실시 및 정보 제공에 대한 절차 수립, 유관기관 및 민간단체와의 협조 및 지원체계 등이 가장 중요하다고 응답되었다. 마지막으로 산사태 SOP 활용을 위한 요구사항은 이를 사용할 수 있는 전문 인력의 확충, 법 제도적 강화, SOP 습득을 위한 교육 및 훈련 등 2차적인 요소에 대한 중요성이 나타났다.