• 한국공간정보시스템학회:학술대회논문집
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• 2007.06a
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• pp.117-123
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• 2007

최근 도시화 산업화가 진행됨에 따라 급격한 토지이용 변화가 발생되어 이로 인한 수질악화 등의 문제가 대두되면서 효율적인 수자원 관리를 위한 대책이 필요한 실정이다. 특히, 비점오염물질로 인한 수질악화는 수문현상 및 토지이용변화와 밀접한 관련이 있어 그 발생량을 추정하기에 매우 어려움이 많았다. 근래 수문 수질관리를 하기 위한 방법으로 GIS기반의 수질모형을 이용한 연구가 활발히 진행되고 있다. 그 중 SWAT(Soil and Water Assesment Tool)모형은 다양한 토지이용변화로 인한 장기유출과 수질모의가 가능한 모형으로서 적극 활용되고 있다. 본 연구에서는 경안천 유역을 대상으로 ArcView기반의 AVSWAT2000모형을 이용하여 미래 토지이용변화가 수문-수질에 미치는 영향을 분석하고자 하였다. Landsat TM, $ETM^+$ 위성영상으로부터 시계열 토지이용도를 작성하고, CA-Markov기법을 이용하여 2030, 2060, 2090년도의 미래 토지이용변화를 예측하였다. 모형의 입력 자료인 수문 기상자료와 지형자료(DEM, 토양도, 하천도 등), 수질자료(TN, TP, SS)를 구축하여 미래 토지이용변화에 따른 유출량과 비점오염 부하량의 변화를 예측하였다.

• Proceedings of the Korea Water Resources Association Conference
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• 2006.05a
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• pp.1131-1134
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• 2006

우리나라는 최근 기상변동에 따른 집중호우와 태풍의 영향으로 풍수해 피해지역 및 재산피해액이 증가하고 있다. 이러한 풍수해 피해를 경감시키기 위해 많은 연구와 노력이 계속되고 있다. 최근에는 지리정보시스템을 이용하여 시간적, 공간적 분석을 통해 홍수범람지도 등을 작성하여 홍수 피해를 최소화 하려고 노력을 하고 있다. 본 연구에서는 지리정보시스템을 이용한 홍수범람 수심의 분포 및 범람면적 등을 산정하기 위해 HEC-GeoRAS와 HEC-RAS를 연계하여 IHP 대표시험유역으로 운영중인 금강수계 보청천유역내 삼가천 지류인 적암천에 적용하였다. 유역의 유출분석 후 ArcView와 HEC-GeoRAS를 통하여 지형학적인 인자와 요소들을 추출하고 실측자료와 비교하였으며, 빈도별 홍수량에 대한 하천의 빈도분석 후 홍수위 및 빈도별 홍수 위에 따른 피해 면적 산정 후 GIS System을 이용하여 홍수범람위험 지역을 결정하였으며 산정된 기본자료는 유역의 홍수발생시 인명과 재산 피해에 대비한 홍수범람 지도 및 홍수재해 지도 제작에 도움이 될 것으로 판단된다.

• Journal of the Korean Society of Environmental Restoration Technology
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• v.9 no.6
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• pp.162-167
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• 2006

The urban stream includes the channel and sandbars. The sandbar plays a key role in the riparian ecosystem. For birds and insects the sandbar offers a small strip of habitat and fish and other fauna feed in the boundary of sandbar where eddies occur. So, it is important habitat and source for the flow of energy, matter and organisms through the landscape and act as ecotone between the terrestrial and stream corridors. However, the sandbar changes continuously by the natural process. Thus, it is necessary to measure the shape and area of the sandbar accurately for the efficient urban stream management for the amenity of urban residents and stream protection. The study site is Yangjae Stream where the first natural-style urban stream restoration projected was impelemented by the support of Ministry of Education in Korea. The measurement was taken by the beacon Differential Global Positioning System (DGPS) and the data were stored and analyzed using ArcView Geographic Information System (GIS) program. Therefore, the purpose of this study is to measure the change of sandbars in the urban stream after concentrated stormwater during summer.

• Journal of Korean Society of Rural Planning
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• v.20 no.3
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• pp.67-74
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• 2014

The purpose of this study is to estimate regional economic effects of spatial diffusion of wildfire using Cobb-Douglas production function of agriculture and forestry. The analysis is applied to Gangwon and Gyeongbuk provinces where are the most damaged of wildfire in Korea. The damaged areas are derived from multiplied by the occurrence probability of wildfire and diffusion areas of wildfire for micro-spatial unit level with ArcGIS techniques. The models of wildfire provides that the spatial diffusion of wildfire increases with the rising of highest temperature and average wind speed. Through the production function, value added of Agriculture and Forest sectors get damaged where the Cos-converted slope aspect of mountains are toward the South. The production model provides reductions of regional value added by increasing damaged areas of wildfire. It reveals that the most damaged region is Andong city in Gyeongbuk province, where value added loss is 1.25 billion Won, which is about 0.72% of total value added in agriculture and forestry of the city. As a view of policy makers, it needs to be considered to establish prevention policies against wildfires because regional economic losses from wildfire are depending on geographical conditions and performances of the major industry related to wildfire's diffusion such as agriculture or tourism sector according to the result of analysis.

• Proceedings of the Korea Water Resources Association Conference
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• 2004.05b
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• pp.742-747
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• 2004

최근 들어 지구온난화에 따른 이상기후 및 집중호우 빈발 그리고 급격한 도시화와 산업화는 예측하기 어려운 수문현상의 변화를 유발시키고 있다. 이에 따른 유출양상의 변화는 수문분석에 의한 기존의 설계기준에도 변화를 요구하고 있다. 즉, 설계빈도의 무조건적인 상향조정에 따른 확정론적인 방법에 의존하기보다는 수문량의 변화를 통계학적으로 반영한 수 있도록 불확실성 분석이 필요하게 되었다. 따라서 설계홍수량에 따른 범람면적별 홍수피해액을 산정할 때 설계홍수량에 대한 불확실성 분석을 수행함으로써 안전율을 고려 할 범람과 홍수피해액을 추정할 수 있는 것이다. 본 연구에서는 Bayesian에 의해 불확실성을 고려한 빈도별 설계홍수량을 산정하였으며, HEC-GeoRAS와 HEC-RAS 및 ArcView GIS 3.2a를 이용해 홍수범람면적을 수치지형도에 도시하고, 범람면적별 홍수피해액을 산정하였다. 또한, 불확실성을 고려하지 않은 경우에 대해서는 L-모멘트법을 이용해 설계홍수량을 구하고 홍수범람면적파 홍수피해액을 산정하였다. 불확실성의 고려 여부에 따른 설계홍수량과 예상 홍수피해액을 비교${\cdot}$분석한 결과 불확실성을 고려한 경우가 불확실성을 고려하지 않은 경우에 비해 설계홍수량은 $7\~33\%$, 예상 홍수피해액은 $1\~4\%$정도 차이를 보였다.

• Proceedings of the Korea Water Resources Association Conference
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• 2007.05a
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• pp.1558-1562
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• 2007

우리나라 지형은 전체의 70%가 산지로 이루어져 있다. 특히 강원도 지역과 같이 산지가 대부분인 지역에서는 경사도에 따라 강우에 의한 유출특성이 크게 달라질 수 있으므로 지형의 경사가 고려된 유출량 산정방식이 필요하다. 현재 유출량 산정 방식에 많이 이용되고 있는 SCS의 CN값은 미국의 중서부 지역과 같이 경사도 5%미만인 지역에서의 유출량 산정에 적합한 유출곡선지수이다. 경사도 5%에서 유출량 산정에 적합한 CN값을 우리나라의 강원도 지형과 같이 복잡하고 경사도가 심한 지역에 적용하기에는 부적합하다. 따라서 본 연구에서는 연구대상지역인 도암댐 유역의 평균 25.8% 경사도를 고려한 직접유출량을 산정하여 기존 평균 경사도 5%일 때의 직접유출량과 비교분석하였다. 본 연구의 비교분석에 있어서 직접유출의 모의가 가능한 Long-Term Hydrologic Impact Assessment (L-THIA) ArcView GIS 모델을 사용하였고 모델의 적용성 평가를 위해 수문분석에 사용되고 있는 WHAT 모듈을 이용하여 분리된 직접유출과 비교하였다. 그 결과 유출량 산정을 위해 CN값 산정시 강원도 지형과 같이 지형이 복잡하고 경사가 심한 지형에 있어서는 유역의 경사도를 고려하여 유출을 모의해야 한다는 것을 알 수 있다.

• Journal of Korea Water Resources Association
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• v.41 no.2
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• pp.229-239
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• 2008

This study is to derive the fourth-order Geomorphologic Instantaneous Unit Hydrograph (GIUH), driven for only third-order basin, for the application of GIUH to various types of basin. The second, third, and fourth order GIUHs were compared for various topographical conditions. The results showed lower peak runoff and later peak time in GIUH with higher stream order. Initial state probability was estimated from a function of geomorphologic parameters such as area ratio and bifurcation ratio for the application of GIUH. However, initial state probabilities and early parts of the GIUHs have negative values for many basins due to the inherent errors in the parameters. Initial state probability was calculated by area ratio of direct drainage using ArcView GIS 3.2 model to solve the problem. GIUHs were estimated for three basins, Sanganmi, Byeongcheon, and Sangye, using the above suggested method, and the results showed that the method is free of the problem.

• Journal of the Korean Geophysical Society
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• v.2 no.1
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• pp.75-88
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• 1999

A recent major subject of geophysical exploration is research into 3-D subsurface imaging with a composite information from the various geophysical data. In an attempt to interpret Schlumberger sounding data for the study area in 2-D and 3-D view, resistivity imaging was firstly performed and then pseudo-3-D resistivity volume was reconstructed by interpolating several 1-D resistivity plots. Electrical resistivity discontinuities such as fracture zone were successfully clarified in pseudo-3-D resistivity volume. The low resistivity zone mainly associated with fracture zone appears to develop down to granitic basement in the central part of the study area. Seismic velocity near the lineament is estimated to be approximately as small as 3,000 m/s, and weathering-layer for the southeastern part is interpreted to be deeper than for the northwestern part. Geophysical attributes such as electrical resistivity, seismic velocity, radioactivity for the Chojeong Area were analysed by utilizing a GIS software Arc/Info. The major fault boundaries and fracture zones were resolved through image enhancement of composite section (electrical resistivity and seismic refraction data) and were interpreted to develop in the southeastern part of the area, as characterized by low electrical resistivity and low seismic velocity. However, radioactivity attribute was found to be less sensitive to geological discontinuities, compared to resistivity and seismic velocity attributes.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.28 no.6B
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• pp.697-707
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• 2008

The grid-based KIneMatic wave STOrm Runoff Model (KIMSTORM) by Kim (1998) predicts the temporal variation and spatial distribution of overland flow, subsurface flow and stream flow in a watershed. The model programmed with C++ language on Unix operating system adopts single flowpath algorithm for water balance simulation of flow at each grid element. In this study, we attempted to improve the model by converting the code into FORTRAN 90 on MS Windows operating system and named as ModKIMSTORM. The improved functions are the addition of GAML (Green-Ampt & Mein-Larson) infiltration model, control of paddy runoff rate by flow depth and Manning's roughness coefficient, addition of baseflow layer, treatment of both spatial and point rainfall data, development of the pre- and post-processor, and development of automatic model evaluation function using five evaluation criteria (Pearson's coefficient of determination, Nash and Sutcliffe model efficiency, the deviation of runoff volume, relative error of the peak runoff rate, and absolute error of the time to peak runoff). The modified model adopts Shell Sort algorithm to enhance the computational performance. Input data formats are accepted as raster and MS Excel, and model outputs viz. soil moisture, discharge, flow depth and velocity are generated as BSQ, ASCII grid, binary grid and raster formats.

• Journal of Korean Society of societal Security
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• v.2 no.4
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• pp.43-48
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• 2009

During the past few years, Korea has experienced extraordinary floods, which have caused many damages of lives and properties. Flooding caused by typhoon is the most common disastrous phenomenon of nature among all catastrophes. As the average temperature of the earth has been increasing by global warming, the possibility of typhoon is also increased by abnormal climate changes. Along with the river improvement as a part of flood control, the time of concentration has been decreased, so the pick discharge has been increased. Moreover, with the land development activities, the area of storage has been diminishing, and the damages from inundation have been continuously increasing. There were a lot of damages to farmland in 1960's, industrial and public facilities in 1970's, and a lot of sufferings from the windstorm in 1980's. In 1990's, however, the amount of damages was increased substantially. So, there is need to decrease the number of the victims and loss of properties by applying preventive measures against natural calamities. This study has employed a simulation system to calculate the depth and amounts of inundation areas to forecast and prevent from flood damage by using rainfall-runoff model. In this study, a case study method is adopted to show inundation by using rainfall-runoff model, HEC-GeoRAS and Arcview. It is hoped that, this study would be conducive to professionals and organizations working in the field of disaster management.