• KSCE Journal of Civil and Environmental Engineering Research
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• v.39 no.5
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• pp.569-577
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• 2019

Urban flooding has been a frequent phenomenon in recent years caused by the increase in maximum stormwater runoff arising from abnormal rainfall due to global warming, urban development, and development of lowlands according to population inflows. In order to respond positively against abnormal precipition in the city, it is necessary to check the GWI (Green Water Infra) effect and effectively utilize the existing stormwater detention tanks and treat stormwater to prevent local flooding. In this study, Overflow Type stormwater drainage methods are evaluated as a method of preventing urban flooding in abnormal precipitation using the Dynamic Wave Analysis SWMM (Storm Water Management Model) provided by the United States Environmental Protection Agency. Comparing and analyzing the Upward Watergate Type and Overflow Type, it was analyzed that the Overflow Type reduces the maximum flood discharge by 61 % and the total flood volume by 56 % in the rainfall of Typhoon Kong-rey. The application of the Overflow Type and the natural-pneumatic drainage method to the rainfall of Typhoon Soulik resulted in a 20 % reduction in maximum flood runoff and a 67 % reduction in total flood quantity. Therefore, as a solution to the abnormal rain fall, it is possible to improve the existing stormwater detection tank and install additional facilities. It is expected to be economically possible to strom drainage under limited conditions.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2008.05a
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• pp.281-284
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• 2008

Inundation of substation and ground power equipment breaks out every summer season in low-lying downtown and low-lying shore by localized heavy rain, typhoon and tidal wave. In case inundation excluding the exchanging cost of equipment, it occurs a great economic and social loss owing to recovery time and events of electric shock occur by inundation electrical equipment(Pad-mounted Transformer and Switch). In case of installing the power equipment at flood danger territory, we are necessary to the product development, the product is that water does not come in the inside the power equipment. Product of pressure maintaining are established on the basic frame and sensor operates at the flooding occurrence and is maintained a shutting tightly structure and it is a method. The product which is produced the reliability of the product it confirmed a flooding yes or no from the condition which puts in the water tank and it verified. We estimate that loss cost which is caused by with flooding and the power failure will be diminished if it is addition to advances the reliability evaluation and a security of the flood protection product.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.5
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• pp.557-564
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• 2017

The purpose of the thermal imaging observation device mounted on the K's tank in the Republic of Korea military is to convert infrared rays into visual information to provide information about the environment under conditions of restricted visibility. Among the various performance indicators of thermal observation devices, such as the view, magnification, resolution, MTF, NETD, and Minimum Resolvable Temperature Difference (MRTD), the MRTD is the most important, because it can indicate both the spatial frequency and temperature resolvable. However, the standard method of measuring the MRTD in NATO contains many subjective factors. As the measurement result can vary depending on subjective factors such as the human eye, metal condition and measurement conditions, the MRTD obtained is not stable. In this study, these qualitative MRTD measurement systems are converted into quantitative indicators based on a gray scale using imaging processing. By converting the average of the gray scale differences of the black and white images into the MRTD, the mean values can be used to determine whether the performance requirements required by the defense specification are met. The (mean) value can also be used to discriminate between detection, recognition and identification and the detectable distance of the thermal equipment can be analyzed under various environmental conditions, such as altostratus, heavy rain and fog.

• Korean Journal of Soil Science and Fertilizer
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• v.31 no.3
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• pp.211-215
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• 1998

Soil loss and runoff were investigated in a small watershed located in Sangeo-ri, Yeoju-eup, Yeoju-gun, Kyonggi-do. The watershed with the area of 35 ha consists of forest, grassland, uplands and mulberry. V-notch type water tank. flow-meter, automatic water sampler and rain gauge were installed at the main outlet stream. Out of $1.037.9Mg\;35ha^{-1}$ of total annual rainfall. 17.9% was lost via run-off. The total amount of soil eroded was $152.2Mg\;35ha^{-1}$, of which $78.6Mg\;35ha^{-1}$ was suspended load and $73.6Mg\;35ha^{-1}$ ha was sediment load. The soil losses under different land uses were $16.02Mg\;ha^{-1}$ for upland annual Crops. $2.69Mg\;ha^{-1}$ for mulberry field, $0.58Mg\;ha^{-1}$ for grassland and $0.55Mg\;ha^{-1}$ for forest. The predicted soil loss by Universal Soil Loss Equation was approximately 20% underestimated in forest, grassland and uplands, and 32% underestimated in mulberry field.

• Proceedings of the Korea Water Resources Association Conference
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• 2023.05a
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• pp.356-356
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• 2023

충청북도 청주시 상당구 월오동 251-7번지와 251-15번지 2곳에 각각 50m³ 규모의 빗물저류조를 대상으로 2017년 7월 16일 호우사상을 적용하여 설치 전·후의 침수저감 효과를 분석하였다. 침수분석을 위해 지형자료는 국토정보플랫폼에 있는 1:25,000 자료를 활용하였으며, 모의 전 대상지역의 관망구축에 따른 지형자료를 구축하였고 관망은 노드 40개와 링크 39개로 구성하였다. SWMM 모형을 구동하여 유역내 유출량을 분석하기 위해 유역과 관련한 입력자료와 이외 유역간의 연결부인 관거 하도 입력자료 구축 및 하도와 하도를 연결하는 모델상의 Junction인 실제 맨홀과 관련한 입력자료를 구축하였다. 관거 입력자료로는 관거의 제원, 길이, 깊이 등의 자료를 수집하여 사용하였다. 빗물저류조 설치전·후의 침수저감효과를 분석하기 위해 빗물저류조 설치전의 침수양상을 모의 하였으며 각각 강우발생 후 30분, 50분, 70분, 90분, 110분, 130분 및 150분으로 구분하여 분석하였다. 강우발생 후 150분의 모의분석 결과, 침수심은 0.2<깊이<0.4의 면적이 600m²로 가장 넓은 침수분포를 나타내었으며, 총 침수면적은 2,225m²로 모의되었다. 이는 강우발생 후130분 보다 125m² 더 침수되었으며, 0.8<깊이<1.0의 면적은 150m²로 모의되었다. 전체적인 침수심도 커진 것으로 분석되었다. 빗물저류조 설치 후의 침수양상을 모의하였으며 각각 강우발생 후 30분, 50분, 70분, 90분, 110분, 130분 및 150분으로 분석하였다. 강우발생 후 150분의 모의분석 결과, 침수심은 0.2<깊이<0.4의 면적이 250m²로 가장 많은 침수분포가 나타났으며, 총 침수면적은 550m²으로 모의 되었다. 이는 강우발생 후 110분과 침수면적은 동일하게 모의 되었으며, 침수심 0.2<깊이<0.4의 면적은 250m²로 모의 되었다. 따라서 해당 지역에 50m³ 규모의 빗물저류조 2개를설치 할 경우 침수피해가 저감되는 것으로 분석되었다. 이러한 분석 결과를 바탕으로 향후 도시내 상습침수구역에 빗물저류조를 설치하여 기후변화에 따른 극한 강우에 대비할 수 있도록 해야 할 것이다.