• 지적과 국토정보
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• 제46권1호
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• pp.59-74
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• 2016

최근 기후변화에 따른 집중호우로 인해 도심지 옹벽 및 축대붕괴, 토사유실 그리고 산사태가 발생하고 있다. 본 연구에서는 토양도, DEM, 토지피복도와 같은 공간정보를 RUSLE 모델에 적용하여 토사유실모델링을 수행하였다. 특히 토사유실량을 지적도와 연계하여 필지별로 토사유실 및 단위토사유실 등급도를 작성하였으며, 토사유실 등급별로 필지수를 계산할 수 있었다. 또한 도시계획이나 건설 분야에서 토사유실 등급을 현장에서 확인할 수 있도록 모바일 GIS 기반의 토사재해정보시스템을 개발하였다. 토사재해정보시스템을 통해 토지대장, 건축물대장 그리고 도로구간대장에 대한 현황을 확인할 수 있으며, 필지별로 RUSLE 인자와 토사유실량 그리고 토사재해등급을 확인할 수 있었다. 또한 행정동과 토사유실등급별로 해당 필지의 위치와 속성을 검색함으로써 현장에서 토사재해업무를 효과적으로 지원할 수 있을 것으로 판단된다.

• 한국지반환경공학회 논문집
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• 제20권3호
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• pp.5-14
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• 2019

This study attempted to study the soil erosion dynamic in the Bagmati Basin of Nepal. In this study, an inclusive methodology that combines Revised Universal Soil Loss Equation (RUSLE) and GIS techniques was adopted to determine the distribution of soil loss in the study basin. As well, this study attempts to study the intensity of soil erosion in the seven different land use patterns in the Bagmati Basin. Soil loss is an associated phenomenon of hydrologic cycle and this dynamic phenomenon possesses threats to sustainability of basin hydrology, agriculture system, hydraulic structures in operation and overall ecosystem in a long run. Soil conservation works, and various planning and design of watersheds works demands quantification of soil loss. The results of the study in Bagmati Basin shows the total annual soil loss in the basin is 22.93 million tons with an average rate of 75.83T/ha/yr. The computed soil loss risk was divided into five classes from tolerable to severe and the spatial pattern was mapped for easy interpretation. Also, evaluation of soil loss in different land use categories shows barren area has highest rate of soil loss followed by agriculture area. This is a preliminary work and provides erosion risk scenario in the basin. The study can be further used for strategic planning of land use and hydrologic conservation works in a basin.

• 한국측량학회:학술대회논문집
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• 한국측량학회 2006년도 춘계학술발표회 논문집
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• pp.527-531
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• 2006

Recently, the development project is conducting disaster effect estimation to breed disaster, and cope these disaster beforehand provoking soil erosion and flood. Therefore, it is became important to analysis and reduce of these disaster. In this study, receive value of LS and C factor of soil erosion through the digital image. The method of photogrammetry was employed for the efficient surveying and analysis of cutting slope using Remote Control Helicopter installed with a nonmetric digital camera. As a result, we obtain more objectivity value of soil erosion factor using digital image analysis.

• 한국방재안전학회논문집
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• 제12권2호
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• pp.65-72
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• 2019

한국은 국토의 64%이상이 산지로 구성되어 있어 산지재해에 취약한 지형적 특성을 가진다. 연구대상지역인 태백산국립공원 당골유역은 탐방로 대부분이 급경사지와 인접해 있어 집중호우 시 산사태와 토석류에 취약한 지역이다. 본 연구에서는 결정론적 분석방법인 사면안정성 모델을 이용하여 사면재해 발생예측 가능성을 검토하였다. 모델의 매개변수는 정밀토양도의 토양분류에 따라 토질의 단위중량, 유효점착력, 흙의 내부마찰각, 유효토심, 지표경사 등을 이용하였고 1 m격자의 DEM을 바탕으로 사면안정성 평가를 실시하였다. 사면안정성평가 분석결과 지하수/ 유효토심과의 비가 1.0에 가까워질수록 위험지역이 높게 나타났으며, 국립공원 하류지역의 민가와 상업시설 상당수가 위험에 노출된 것으로 나타났다.

• 한국농공학회논문집
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• 제58권5호
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• pp.81-90
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• 2016

Due to droughts and water shortages causing severe damage to crops and other vegetations, much attention has been given to efficient irrigation for upland farming. However, little information has been known to measure soil moisture levels in a field scale and apply their spatial variability for proper irrigation scheduling. This study aimed to characterize the spatial variability and temporal stability of soil water contents at depths of 10 cm, 20 cm and 30 cm on flat (loamy soil) and hill-slope fields (silt-loamy soil). Field monitoring of soil moisture contents was used for variogram analysis using GS+ software. Kriging produced from the structural parameters of variogram was applied for the means of spatial prediction. The overall results showed that the surface soil moisture presented a strong spatial dependence at the sampling time and space in the field scale. The coefficient variation (CV) of soil moisture was within 7.0~31.3 % in a flat field and 8.3~39.4 % in a hill-slope field, which was noticeable in the dry season rather than the rainy season. The drought assessment analysis showed that only one day (Dec. 21st) was determined as dry (20.4 % and 24.5 % for flat and hill-slope fields, respectively). In contrary to a hill-slope field where the full irrigation was necessary, the centralized irrigation scheme was appeared to be more effective for a flat field based on the spatial variability of soil moisture contents. The findings of this study clearly showed that the geostatistical analysis of soil moisture contents greatly contributes to proper irrigation scheduling for water-efficient irrigation with maximal crop productivity and environmental benefits.

• 지질공학
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• 제33권4호
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• pp.555-571
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• 2023

우리나라는 연평균 강수량의 70%에 달하는 여름철 강우로 인해 산사태가 자주 발생하고 있으며, 이로 인한 피해 완화를 위해서는 정확한 예측기법이 필요하다. 본 연구에서는 화강암 풍화토를 이용하여 소형 및 실규모 실험을 통한 계측관리기준 수립 가능성을 모색하였다. 실험은 모관흡수력을 중점으로 강우 침투로 인한 지반 특성 변화와 사면붕괴 패턴을 분석하였으며, 이 결과를 기초로 불포화 무한사면 안정성 해석을 수행하였다. 안전율이 1 미만으로 떨어지는 조건에서 붕괴도달 시간을 산정한 결과, 소형 실험의 경우 약 17분 전, 실규모 실험의 경우 약 6.5시간 전으로 산사태 예측이 가능한 경향을 나타냈다. 이러한 연구 결과는 화강암 풍화토의 특성을 고려한 계측관리기준을 확립하는데 유용한 자료로 활용될 수 있다.

• Structural Engineering and Mechanics
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• 제24권3호
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• pp.275-290
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• 2006

In this paper, the performance of a tuned liquid damper (TLD) in suppressing the seismic response of buildings is investigated with shake table testing of a four-story steel frame model that rests on pile foundation. The model tests were performed in three phases with the steel frame structure alone, the soil and pile foundation system, and the soil-foundation-structure system, respectively. The test results from different phases were compared to study the effect of soil-structure interaction on the efficiency of a TLD in reducing the peak response of the structure. The influence of a TLD on the dynamic response of the pile foundation was investigated as well. Three types of earthquake excitations were considered with different frequency characteristics. Test results indicated that TLD can suppress the peak response of the structure up to 20% regardless of the presence of soils. TLD is also effective in reducing the dynamic responses of pile foundation.

• 한국지리정보학회지
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• 제10권2호
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• pp.82-90
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• 2007

최근 무분별한 개발로 인한 산림지역의 훼손으로 토양의 침식이 발생하고 이는 강우와 결부되어 하천 오염 및 하천의 바닥고를 상승시켜 통수능을 저하시키는 원인이 되기도 한다. 이를 위해 국내에서는 환경영향평가 및 재해영향평가를 통하여 토사유출의 정량적 분석을 실시하여 적절한 대책을 수립하도록 하고 있다. 토사유출량 산정 시 고려되는 매개변수 중 본 연구에서는 무선조종 헬기 통하여 취득한 영상 정보를 이용하여 절취사면의 사면경사계수(LS) 및 토양피복계수(C)를 영상분석을 이용하여 보다 정확한 값을 산정하였다.

• 한국토양비료학회지
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• 제49권5호
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• pp.440-448
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• 2016

Nonpoint sources of pollution (NPS) is defined as diffuse discharges of pollutants (e.g., nutrient, pesticide, sediment, and enteric microorganism) throughout the natural environment and they are associated with a variety of farming practices. Previous studies found that water soluble anionic polyacrylamide (PAM) is one of the highly effective measures for enhancing infiltration, reducing runoff, preventing erosion, controlling nonpoint source of pollutants, and eventually protecting soil and water environment. Potential benefits of PAM treatment in agricultural soil and water environments have been revealed by many research and they include low cost, easy and quick application, and suitability for use with other Best Management Practices (BMPs) for NPS control. This study reviews the various applications of PAM and discusses its further potentials in agricultural environment.

• Journal of Radiation Protection and Research
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• 제46권2호
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• pp.58-65
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• 2021

Background: The evaluation of skyshine distribution, release of airborne radioactive nuclides, and soil activation and groundwater migration were required for radiological assessment of the impact on the environment surrounding In-Flight (IF)-system facility of the RAON (Rare isotope Accelerator complex for ON-line experiment) accelerator complex. Materials and Methods: Monte Carlo simulation by MCNPX code was used for evaluation of skyshine and activation analysis for air and soil. The concentration model was applied in the estimation of the groundwater migration of radionuclides in soil. Results and Discussion: The skyshine dose rates at 1 km from the facility were evaluated as 1.62 × 10^-3 μSv·hr^-1. The annual releases of ³H and ¹⁴C were calculated as 9.62 × 10^-5 mg and 1.19 × 10^-1 mg, respectively. The concentrations of ³H and ²²Na in drinking water were estimated as 1.22 × 10^-1 Bq·cm^-3 and 8.25 × 10^-3 Bq·cm^-3, respectively. Conclusion: Radiological assessment of environmental impact on the IF-facility of RAON was performed through evaluation of skyshine dose distribution, evaluation of annual emission of long-lived radionuclides in the air and estimation of soil activation and groundwater migration of radionuclides. As a result, much lower exposure than the limit value for the public, 1 mSv·yr^-1, is expected during operation of the IF-facility.