• 통합자연과학논문집
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• 제5권4호
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• pp.220-228
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• 2012

District of Korea affected by westerly wind and heavy rainfall is predominantly distributed in the west and south of Honam district. So, this study is becoming a necessity. In this study, it is investigated that the characteristics of heavy rainfall occurred frequently in Honam district along the border of mT airmass after the end of rainy season due to atmospheric instability, lower (850 hPa) convergence and topographic effect. Our results show that heavy rainfall occurred in Honam district along the border of mT airmass results from the appropriate mechanism of the unstable vertical structure and moisture flux in the expansion and contraction of the border of mT airmass. All things considered, the improvement of the predictability of heavy rainfall occurred in Honam district along the border of mT airmass could be possible by the generalization of the results of this study.

• 한국방재학회:학술대회논문집
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• 한국방재학회 2007년도 정기총회 및 학술발표대회
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• pp.501-504
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• 2007

Slope-related disasters have occurred in the rainy season. It can be assumed that one of the most important factor slope-related disasters is rainfall intensity. Slope-related disasters occurred in relatively short time and had characteristics that lead to huge damage. Therefore, if rainfall characteristics were applied to estimate slope stability effectively, slope-related disasters could be predicted and prepared in advance. In this study, the SEEP/W program was used and the frequency rainfall estimated by using precipitation data($1961{\sim}2005$) in Seoul was applied to analyze the change of groundwater level according to rainfall intensity.

• 지질공학
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• 제24권1호
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• pp.69-79
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• 2014

본 연구의 목적은 토양침식에 관련되는 강우특성, 토양경사도, 그리고 지질특성의 상대적인 중요도를 규명하는데 있다. 이 목적을 달성하기 위하여, 강우강도, 토양경사도, 지질특성의 각각 다른 조건에서 실내 인공강우실험 및 현장조사를 실시하였다. 실내시험 결과에 의하면, 토양침식량은 토양 경사도가 강우강도보다 크게 영향을 받았다. 유출량은 강우량에 비례하며, 점토함량이 높을수록 증가한다. 따라서 토양의 유기물과 점토 함량이 큰 토양에서 토양침식량이 크게 증가 하였다. 현장시험 결과로는 토양경사가 큰 지역 및 퇴적암 지역보다 변성암 지역에서 보다 큰 침식량이 계산되었다. 이러한 실험의 결과는 토양침식량을 예측하는 모델개발에 있어서 기반암 풍화의 산물인 토양에서의 지질특성이 침식 및 침식후의 퇴적특성을 잘 반영하고 있음을 보여준다.

• 한국지반공학회논문집
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• 제31권8호
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• pp.5-15
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• 2015

불포화 지반에서 선행강우에 의한 강우침투특성을 분석하기 위하여 국내 편마암 풍화토에 대한 일차원 실내강우 침투실험을 수행하였다. 춘천 및 충주지역 시료에 대한 실내모형실험에서 불포화토의 음의 간극수압은 강우 재하시 급격히 감소하고, 강우 종료후 점차 회복되었다. 강우강도가 증가함에 따라 침투속도가 증가하였으며, 선행강우시보다 본강우에서 침투속도가 빠른 것으로 나타났다. 이는 선행강우에 의하여 증가된 지반의 높은 포화도가 본강우시 강우침투속도를 증가시킨 것으로 사료된다. 특히 점토함유량이 많은 충주시료에서 음의 간극수압의 회복 속도와 침투속도가 느리게 나타났다. 유한요소 사면안정에 대한 수치해석 결과는 강우 침투에 의한 음의 간극수압의 감소에 따른 사면 안전율을 감소와 강우 종료후 간극수압의 확산에 의한 추가적인 사면 안정성 저감을 보여주고 있다. 사면의 안전율은 선행강우시 보다 본강우에서 더욱 감소하였다. 선행강우는 불포화지반의 초기 간극수압의 크기와 깊이별 패턴에 지대한 영향을 미치며, 이는 강우 사면의 안정성 해석에 고려해야 할 중요한 요소이다.

• 한국수자원학회논문집
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• 제41권7호
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• pp.747-759
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• 2008

본 연구에서는 관측강우의 통계특성 및 발생특성을 가장 적절하게 재현해 주는 강우모형을 선정하고자 하였다. 강우모형으로 Poisson과정에 근거한 점과정모형인 RPPM, NS-RPPM, modified NS-RPPM을 고려하여 모의자료에 대한 통계분석을 수행하였다. 그 결과, NS-RPPM과 modified NS-RPPM을 이용하여 모의된 자료가 여러 집성시간의 통계치를 적절하게 재현하였다. 또한 modified NS-RPPM을 이용하여 모의된 자료가 관측자료와 가장 유사한 발생특성을 가지는 것을 알 수 있었다. 특히, 홍수, 산사태 등 자연재해의 발생에 큰 영향을 주는 큰 강도를 가지는 강우를 관측치와 가장 유사하게 재현하였다. 모의된 강우사상의 총 강우량, 강우기간, 강우사상 간의 간격을 관측강우와 비교해본 결과 또한 modified NS-RPPM이 가장 좋은 결과를 보였다. 본 연구의 결과를 종합해 볼 때, 강우의 장기 모의를 위해 modified NS-RPPM을 이용하는 것이 가장 적절할 것으로 판단된다.

• 대기
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• 제26권4호
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• pp.495-508
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• 2016

In order to determine the prediction possibility of heavy rainfall, a variety of analyses was conducted by using three-dimensional data obtained from Korea Local Analysis and Prediction System (KLAPS) re-analysis data. Strong moisture convergence occurring around the time of the heavy rainfall is consistent with the results of previous studies on such continuous production. Heavy rainfall occurred in the cloud system with a thick convective clouds. The moisture convergence, temperature and potential temperature advection showed increase into the heavy rainfall occurrence area. The distribution of integrated liquid water content tended to decrease as rainfall increased and was characterized by accelerated convective instability along with increased buoyant energy. In addition, changes were noted in the various characteristics of instability indices such as K-index (KI), Showalter Stability Index (SSI), and lifted index (LI). The meteorological variables used in the analysis showed clear increases or decreases according to the changes in rainfall amount. These rapid changes as well as the meteorological variables changes are attributed to the surrounding and meteorological conditions. Thus, we verified that heavy rainfall can be predicted according to such increase, decrease, or changes. This study focused on quantitative values and change characteristics of diagnostic variables calculated by using numerical models rather than by focusing on synoptic analysis at the time of the heavy rainfall occurrence, thereby utilizing them as prognostic variables in the study of the predictability of heavy rainfall. These results can contribute to the identification of production and development mechanisms of heavy rainfall and can be used in applied research for prediction of such precipitation. In the analysis of various case studies of heavy rainfall in the future, our study result can be utilized to show the development of the prediction of severe weather.

• 한국방재학회 논문집
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• 제6권3호
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• pp.57-68
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• 2006

본 연구에서는 강우의 수문학적 특성을 고려하여 단시간강우의 시간분포를 분석하고, Huff의 무차원 누가곡선을 제시하였으며, 강우의 수문학적 특성은 지속기간, 강우의 발생원인(장마, 태풍, 집중호우, 전선형강우), 구간변화 등으로 분류하였다. 본 연구의 수행으로 인해 얻어진 결과를 요약하면 다음과 같다. 첫째, 국내 도시지역의 단시간 강우의 최대강우강도는 전방위구간에서 발생할 확률이 가장 높게 나타났으며, 둘째, 강우발생원인별 분류에서도 전반적으로 전방위구간에서 최대강우강도가 발생하였으나 태풍의 경우에는 후방위구간에서 최대강우강도가 발생하였다. 셋째, Huff의 6구간 분석에서는 동일한 위치에 해당되는 제2구간에서 우세하였다. 넷째, 전기간 강우자료를 이용한 기존 연구들의 무차원 누가곡선 및 특성변수와의 비교를 실시하여, 수문학적 특성에 따라 무차원 누가곡선의 위치 및 특성변수의 값에서 차이가 발생한다는 것을 알 수 있었다.

• 상하수도학회지
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• 제26권1호
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• pp.47-54
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• 2012

This study analyzed influence factors and the correlation among pollutants which affect occurrence of leaked pollution based on the long-term runoff flow and water quality investigation results to understand the characteristics of highway rainfall runoff pollution load. According to the result of correlation analysis on TSS (Total Suspended Solid) concentration, anteceded dry days, rainfall intensity, traffic volume and etc. as major influence factors of highway rainfall runoff pollution loads, the correlations were weak or scarce in most items. These results might be attributed that runoff pollutant concentration changes vary severely on changes of rainfall intensity and rainfall duration within rainfall and it is affected by disturbances of vehicles and street cleaning and etc. as characteristics of the highway. While Cu, Fe and Zn which are discharged with high concentrations out of heavy metals showed high correlation with particulate matter, organic matter(COD), nutrient(TN, TP), Ni and Pb showed relatively low correlation in a correlation evaluation by pollutant. Significant correlation with traffic volumes was not shown and TSS concentration even decreased in accordance with increase of the traffic volume. In the comparison with precedent studies, it was considered necessary additional analysis of the effects of rainfall section analysis, road type, disturbances of surface contaminants by vehicles, rainfall and climate conditions, surrounding terrains etc.

• 한국환경복원기술학회지
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• 제14권2호
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• pp.33-45
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• 2011

The purpose of this study to analyze landslide-triggering factors using the 38 landslide cases occurred by typhoon, Rusa in 2002, Maemi in 2003 and Ewiniar in 2006 and geospatial characteristics in Hamyang and Geochang County. where two day's heavy rainfall was concentrated on. The rainfalls factors to trigger landslides were accumulative rainfall (>230mm) and rainfall intensity(>30-75mm). The highest landslide frequency was concentrated on the areas of 400-900m in height and on the slopes of $25-40^{\circ}$ in degree. The frequency of landslide was high exceedingly above 80% of a slope attitude, while the frequency is very low below 70%. Granite was more susceptible as much as 9 times than metamorphic rocks. In areas mixed soil with gravels and rock blocks, the frequency of landslide was 73%.

• 상하수도학회지
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• 제18권3호
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• pp.320-330
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• 2004

Most of domestic city is served combined sewer system among various sewer system like as separate sanitary, combined sewer system and storm sewers. During the wet weather, sewer and rainfall have been overflowed because it is over capacity of the combined sewer system; that is called combined sewer overflows(CSOs) This research was carried out to investigate runoff characteristics of combined sewer and to evaluate the effective CSOs volume in Hong-Chun gun. During wet weather, SS load of first rainfall at H-1, H-2, and H-3 were 600kg/event, 370kg/event, and 289kg/event, respectively. 55 load of second rainfall were 216kg/event, 113kg/event, and 37.2kg/event. When the first rainfall, event mean concentrations(EMCs) at each site were 702mg/L, 816mgjL and 861.5mg/L. The second rainfall's event mean concentrations(EMCs) were 99.9gm/L, 161.9mg/L, 103.6mg/L. Rrst flush coefficient b at each site were 0.237,0.166, and 0.151. When the first rainfall, the flow containing 80% of pollutant mass of CSOs at each site were 0.55, 0.23, 0.48 in first rainfall, respectively. The case of second rainfall were 0.79, 0.83, 0.81. Most of all, characteristics of rainfall like as analysis of first-flush, CSOs volume, pollutant loadings is investigated to decide intercepted volume for control of CSOs.