• Journal of the Korean Institute of Intelligent Systems
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• v.22 no.2
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• pp.187-191
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• 2012

This paper deals with a safe climbing path planning for unmanned automatic vehicles. Unlike the existing path planning schemes, the safety is the highest priority for our approach. To achieve this, the global potential field which includes a dangerous zone as well a given terrain information is generated, and the way-points are determined by using image processing such as the erosion operation. The proposed method can reduce the computation effort and the amount of information, and provide the safe climbing path which is similar to human's intuition.

• Journal of Navigation and Port Research
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• v.43 no.3
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• pp.209-218
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• 2019

Coastal cities suffer a great deal of storm and wind damage. The storm and wind characteristics vary between cities. Therefore, a storm and wind damage management system suited for specific characteristics is required for each coastal city. In this study, we analyze the current situation and establish the problem of storm and wind damage management system in regards to urban management, coastal management and disaster management. We also review the storm and wind damage management system for the USA and Japan. We consequently propose a plan to improve the storm and wind damage management system. As a result of the study, in terms of city management, we recommend the compulsory identification of disaster prevention districts, implementation of the integrated coastal city management plan, designation of natural disaster risk mitigation area as disaster prevention district, the division of disaster prevention district into wind damage prevention district, storm damage prevention district, erosion damage prevention district, the building of restrictions at the disaster prevention district by ordinance, etc. In regards to coastal management, we suggest the delegation of authority to delegate coastal erosion management area to the local government, the subdivision of coastal erosion management area into erosion serious area, erosion progress area, erosion concern area, the building restrictions at coastal erosion management area by ordinance, development of erosion prediction chart, etc. In relation to disaster management, we recommend the integration of "countermeasures against natural disasters act" and "disasters and safety management basic act", the local government-led disaster prevention system, the local disaster management network, and the customized local disaster prevention plan, etc.

• Proceedings of the Korea Water Resources Association Conference
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• 2023.05a
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• pp.473-473
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• 2023

토사재해는 토사로 인해 발생하는 재해로 정의되며, 일반적으로 우기(rainy season)에 주로 발생한다. 또한, 강우로 인해 발생하는 토양침식(soil erosion)과 강우 및 지진에 의해 나타나는 산사태로 인한 토석류(debris flow)가 토사재해의 주요 원인으로 꼽힌다. 이러한 재해로 인하여 하천 및 호소의 수질 저하, 토양유실에 따른 농경지 감소 등 여러 문제가 발생하고 있다. 특히, 댐으로 유입되는 토사는 사수역(dead storage)을 증가시키고, 발전용 댐의 경우 토사재해가 발전설비 마모 등을 일으킴에 따라 발전효율을 감소시키기도 한다. 더욱이, 기후변화로 인하여 강우량 및 강우강도가 증가하고, 최근 한반도에서는 지진의 강도와 빈도 또한 증가함에 따라 토사재해의 잠재적 위험성을 증대시키고 있다. 따라서 댐 유역에서의 토사 유입에 관한 정량적 예측을 포함한 종합적인 댐 토사 관리기술 및 대책이 요구된다. 본 연구에서는 현재 수질 악화로 인해 발전이 중단된 도암댐을 대상으로 댐으로의 토사 유입량을 분석하고자 토양침식과 토석류의 정량적 예측이 가능하고, 각각의 물리적 과정을 고려하는 물리기반 모형을 활용하였다. 토사재해의 주요 원인인 강우와 지진에 대해 미래에 발생 가능한 시나리오를 작성하고, 시나리오별 토사 유입량과 유입 비율을 정량적으로 산정하였다. 본 연구의 결과는 유역 내 토사재해로 인한 피해 예방기술 및 댐 유지관리와 운영을 위한 기초 자료로 활용이 가능할 것으로 판단된다.

• Korean Journal of Soil Science and Fertilizer
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• v.38 no.2
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• pp.59-65
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• 2005

This study was performed to estimate the soil loss on a national scale and grade regions with the potential risk of soil erosion. Universal soil loss equation (USLE) for rainfall and runoff erosivity factors (R), cover management factors (C) and support practice factors (P) and revised USLE for soil erodibility factors (K) and topographic factors (LS) were used. To estimate the soil loss, the whole nation was divided into 21,337 groups according to city county, soil phase and land use type. The R factors were high in the southern coast of Gyeongnam and Jeonnam and part of the western coast of Gyeonggi and low in the inland and eastern coast of Gyeongbuk. The K factors were higher in the regions located on the lower streams of rivers and the plain lands of the western coast of Chungnam and Jeonbuk. The average slope of upland areas in Pyeongchang-gun was the steepest of 30.1%. The foot-slope areas from the Taebaek Mountains to the Sobaek Mountains had steep uplands. Total soil loss of Korea was estimated as $50{\times}10^6Mg$ in 2004. The potential risk of soil erosion in upland was the severest in Gyeongnam and the amount of soil erosion was the greatest in Jeonnam. The regions in which annual soil loss was estimated over $50Mg\;ha^{-1}$ were graded as "the very severe" and their acreage was $168{\times}10^3ha$ in 2004. The soil erosion maps of city/county of Korea were made based on digital soil maps with 1:25,000 scale.

• Economic and Environmental Geology
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• v.38 no.6 s.175
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• pp.607-622
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• 2005

This study was carried out in order to evaluate where the soil loss was mainly occurred, .and to verify how riverbed sediments in the tributaries of the Seomjin River were related to their source rocks distributed in Sunchang area. The study area including the Seomjin River with 4 tributaries of Kyeongcheon, Okgwacheon, Changjeong-cheon and Ipcheon was divided into 10 watershed. The RUSLE (Revised Universal Soil Loss Equation) was estimated for all the grids (10 m cells) in the corresponding watershed. The amount of soil loss per unit area was calculated as follows: dry fold (53,140.94 tons/ha/year), orchard (25,063.38 tons/ha/year), paddy field (6,506.7 tons/ha/year) and Idlest (6,074.36 tons/ha/year). The differences of soil loss per unit area appear to be depends on areas described earlier. Soil erosion hazard zones were generally distributed within dry fields. Several thematic maps such as land use maps, topographical maps and soil maps were used as a data to generate the RUSLE factors. The amount of soil loss, computed by using the RUSLE, showed that soil loss mainly occurred at the regions where possible source rocks were distributed along the stream. Based on the this study on soil loss and soil erosion hazard zone together with chondrite-normalized REE patterns that were previously analyzed in same study area, a closed relationship between riverbed sediments and possible source rocks is formed. Especially in the Okgwacheon that are widely distributed by various rocks, chondrite-normalized REE pattern derived from the riverbed sediments, source rock and soil is expected to have a closed relationship with the distribution of soil loss.

• Journal of the Korean Geographical Society
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• v.43 no.3
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• pp.263-275
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• 2008

This Study deals with the comparative analysis on the estimation of surface soil erosion volume between South and North Korea using RUSLE model in Imjin River basin located on DMZ of Central Korea. Comparatively North Korea areas have been more eroded three times as much as South Korea parts. Because of cropland development such as com Held in the hillslope, in North Korea, more surface soil erosion and transportation to the river bed has given rise to frequent flood hazards. It seems that the study can dedicate to mitigation of environmental problems such as soil erosion and flooding in unaccessible Imjin River basin located on DMZ.

• Proceedings of the Korea Water Resources Association Conference
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• 2021.06a
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• pp.235-235
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• 2021

아시아 몬순기후의 영향에 의해 우리나라는 2020년 7월부터 9월까지 약 90일간의 장마로 인해 크고 작은 수재해가 발생하였다. 특히, 안성, 충주, 음성 그리고 곡성 등에서 인명피해가 발생하였으며, 그 외 13개소에서 많은 재산 피해가 발생하였다. 2020년 산사태/토석류 재해로 인한 전국적인 피해액은 약 3,900억으로 보고되고 있으며, 매년 집중호우에 의해 피해 양상이 변하고, 도시지역에서의 발생이 빈번하게 늘고 있다. 집중호우에 의한 산사태/토석류 전이 피해를 저감시키기 위해서는 발생 물질이 어디까지 이동할 수 있는지에 대한 위험범위확산에 대한 연구가 중요하며, 이런 연구를 기반으로 인명피해를 줄이기 위한 연구가 필요하다. 이를 위해 본 연구에서는 천수방정식, 유변학특성 식 그리고 연행침식 식을 조합하여 개발된 적응형 격자기반 2차원 토석류 모델을 이용하여 안성, 음성 그리고 단성지역에서 발생했었던 산사태/토석류 전이 피해 양상을 해석하였다. 산사태 발생 후 2~3일 이내에 지표 지질 및 지형 조사를 실시하였으며, UAV 및 항공사진을 이용하여 산사태 및 토석류의 형태를 맵핑하였다. 지질 및 지형조사 시 간이 Vein tester를 이용하여 야외에서 토양 물성관련 자료를 취득하였으며, 토석류의 이동 흔적(나무 등에의 토석류 타격 흔적)을 이용하여 조사지점에서의 최대 토석류 흐름 깊이를 추정하였다. 정확한 토석류의 유속에 대한 자료 부족으로 2011년 우면산에서 발생한 약 26m/s의 속도를 이용하여 토석류의 흐름 특성을 계산하였다. 이와 더불어 연행침식의 계산을 위해 발생지점 부터 토석류가 퇴적된 하류부까지 기반암의 노출 및 퇴적 정보를 통해 최대 침식 깊이를 추정하여 입력자료로 활용하였다. 토석류 맵핑자료와 비교 결과 정확도가 90%이상으로 나타났으며, 토석류 발생 후 안성 200초, 음성 180초 그리고 단성 180초 이내로 토석류가 하류까지 이동할 수 있는 것으로 계산되었다. 본 연구와 같이 산사태/토석류 발생 메커니즘 해석에 대한 지속적인 연구를 통해 산지 재해에 의한 인명 피해를 줄일 수 있는 토석류확산범위 해석에 대한 연구가 지속적으로 필요할 것으로 판단된다.

• Journal of Korean Society of Forest Science
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• v.103 no.3
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• pp.392-401
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• 2014

This research was carried out to understand the impact of mountainous torrent on topographical change of slope and sediment volume within a deposit line by dredging of soil erosion control dam. Terrestrial LiDAR surveys were conducted at dredged and non-dredged sites. Terrestrial LiDAR has an advantage on detecting topographical changes easily without demanding workmanship and technical skill for users. The distribution of erodible slope ($20^{\circ}-40^{\circ}$) was higher in non-dredged site than that of dredged site. However, the distribution was higher in dredged site than that of non-dredged site after rainy season. Erosion and deposition appeared regularly in a dredged site, but those occurred irregularly in the non-dredged site. The inflow of soil per square meter was 1.7 times higher in dredged site than that of non-dredged site after rainy season. The difference of rainfall in each site did not affect to soil erosion. The distribution of erodible slope was increased in dredged site than that of non-dredged site after rainy season due to inflow of soil from upper stream caused by dredging.

• Spatial Information Research
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• v.17 no.3
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• pp.261-268
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• 2009

This study accomplished to draw a soil erosion map and a grade map of soil loss hazard in Korea. RUSLE and Rainfall-runoff (R) factor, which was estimated by using the rainfall data observed in 59 meteorological stations from 1977 to 2006 (for 30 years). FARD was used to analyze the frequency, and the whole country R factor was estimated according to the frequency. In the analysis of estimating the whole country R factor, Nakdong river has the smallest vaule, but Han river has the biggest value. According to the result of analyzing soil loss, soil loss occurred in a grass land, a bare land and a field in size order, and also approximately 17.2 ton/ha soil loss happened on the whole area. The average soil loss amount by the unit area takes place in a bare land and a grass land a lot. The total amount of soil loss in 5-year-frequency rainfall yields 15,000 ton and, what is more, a lot of soil loss happens in a paddy field, a forest and a crop field. The grade map of soil loss hazard is drawn up by classifying soil loss hazard grade by 5. As a result of analyzing soil loss, the moderate area which is the soil loss hazard grade 2 takes up the largest part, 72.8% of the total soil loss hazard area, on the contrary, the severe soil loss hazard area takes up only $1,038km^2$ (1.1%) of the whole area. The severe soil loss hazard area by land cover shows $93.5km^2$ in a bare land, $168.1km^2$ in a grass land and $327.4km^2$ in a crop field respectively.

• 한국지형공간정보학회:학술대회논문집
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• 2002.03a
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• pp.66-73
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• 2002

본 논문은 미국 Oregon 지역을 실험지역으로 하여 LiDAR자료를 이용하여 연안해역 관리 및 해안지역의 각종 분석자료의 기초데이터로 활용하는 방안을 도출하고자 한다. 실험지역은 미국 Oregon주의 남쪽해안에 위치하고 있는 해안지역이며, 해안선이 완만하게 형성이 되어 있다. 본 실험에 이용된 LiDAR 자료는 97년 10월과 98년 4월 2회에 걸쳐 NASA의 ATM(Airbone Topographic Mapper) II를 이용하여 측량을 실시하였다. 연도별로 취득된 해변지역의 표고값을 근거로 하여 연도별 해변의 단면 변화량을 산출하였다. 본 연구를 통하여 연구지역인 미국 Oregon 해변지형의 표고변화는 연도별로 약 0.79m/year 정도 변화가 발생하였다. 또한 국내에서 해안선 측량시 이용가능성 및 해안선 변화 모니터링, 해변 위험지역 및 침식량 산정 등 다양한 분야의 활용가능성을 제시하였다.