• 한국재난관리표준학회지
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• 제4권1호
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• pp.67-74
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• 2011

본 연구는 집중호우로 발생한 급경사지 붕괴의 발생원인을 조사 분석하였다. 급경사지 붕괴의 발생원인을 도출하기 위하여 2009년 7월에 발생한 급경사지 붕괴현장에 대한 정밀조사를 시행하였다. 급경사지 붕괴의 직접적인 원인은 우기철 선행강우 이후의 집중호우로 판단되며, 산지배수로, 도수로 등 각종 배수로의 기능상실 및 불량, 비탈면의 풍화토 및 풍화암에 대한 풍화특성을 고려않는 사변설계, 도로에 매설된 우수관의 단면부족, 비탈면내 수목뿌리의 지반 교란, 급경사지의 지형 및 지반상태를 고려하지 않은 보강공법 적용 등이 급경사지 붕괴의 주요 원인으로 분석되었다.

• 한국환경과학회지
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• 제7권2호
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• pp.177-184
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• 1998

1981년부터 1990년까지 10년간 발생한 274개의 호우사례를 분류하여,한반도에서 호우시에 나타나는 강수량의 공간분포를 여섯 종류로 나누고 각각의 정관적 특성을 분석하였다. 첫때, 강하게 발달한 지표 저기압에 연관되어 발생하는 호우보다 상, 하층 제트를 동반한 채 발달중인 저기압에 연관되어 발생하는 호우가 많다. 둘째, 재부분의 호우역은 하층 제트의 위치와 방향 그리고 지표 온나전선의 위치에 연관되어 있다. 셋째, 500hPa 면의 저기압 중심이나 기압골의 위치가 서쪽으로 멀어질수록 한반도에어 호우는 고위도에서 발생하는 경향이 있다. 넷째, 한반도에 호우를 초래하는 500hPa의 저기압 중심은 하계몬순의 발달을 따라 서쪽으로 자리잡는 경향이 있으나 해마다 차이가 있다.차이가 있다.

• 응용통계연구
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• 제27권6호
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• pp.1069-1076
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• 2014

기후 온난화의 한 현상으로 받아들여지는 집중호우로 인한 관심이 늘어난 만큼 강우량에 대한 예측 모형이 필요하다. 이러 환경 문제를 다룰 때, 모형을 설정하는 방법 중에 하나로 일반화 파레토 모형을 활용하는 연구가 이루어지고 있다. 본 논문에서는 서울특별시에 대한 1973년부터 2011년까지 매 7월 일별강우량 자료를 가지고 일반화 파레토 모형을 사용하여 강우량의 임계값(70mm) 이상의 분포가 어떻게 되는지 연구한다. 모수의 사전분포는 감마분포랑 역감마분포를 정의하고, 또는 제프리의 정보가 없는 사전분포를 두고, 깁스 표본방법을 통해 베이지안 사후예측분포를 구하고 얻어진 결과를 비교해 본다.

• 기술발표회
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• 통권2006호
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• pp.146-155
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• 2006

2006년도 집중호우에 의해 발생된 강원도지역의 수해에 대하여 자료를 수집, 분석하였으며 수해의 발생기구 및 유형에 따른 피해정도와 저감방안에 대한 고찰을 실시하였다. 2006년 7월 15일-17일 사이의 집중적인 호우는 강원도 지역에 많은 피해를 주었는데, 특히 강원도 인제, 양양, 평창지역에서의 피해로 수십명의 인명피해와 재산피해를 발생시켰다. 최근 들어 발생되는 집중호우로 인한 피해 중 토석류에 의한 피해가 많은 이유 중에는 지구온난화로 인한 100mm에 가까운 시간당 강우량을 보이고 있어 국내에서 산악지가 형성된 구간에서는 어느 지역이나 토석류가 발생될 가능성을 지니고 있다고 할 수 있다. 그러므로 본 연구에서는 2006년 7월에 발생된 강원도 인제, 양양지역을 중심으로 토석류 피해에 대하여 자료를 수집, 분석하였으며 토석류 발생기구 및 유형에 따른 피해정도와 저감방안에 대한 고찰을 실시하였다. 앞으로 빈번해지는 토석류에 대한 관리체계의 확립 및 보완대책과 토목 공사시에 반영될 수 있는 방안 등을 모색해야 할 것이다.

• 산업기술연구
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• 제30권B호
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• pp.91-98
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• 2010

Recently, there has been enormous damage due to river floodings caused by localized heavy rains. The direct discharge triggered by those torrential rains inflicts severe property damage on the residents of nearby areas. To minimize the possibility of river floodings in case of heavy rains and to predict the possible damage, the management of existing rainfall and water level observatories should be checked and prediction methods based on the characteristics of water usage and floodgate of nearby rivers must be further analyzed. Therefore, this research analyzed the water level change predictions on different spots with a regression equation of rainfall and water levels, using the observation data of the water level observatory in Jeongseon-gun, Gangwon Province and the rainfall observatory which are located on the upper region of the Han river.

• 대기
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• 제33권5호
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• pp.457-475
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• 2023

Accurately predicting localized heavy rainfall is challenging without high-resolution mesoscale cloud information in the numerical model's initial field, as precipitation intensity and amount vary significantly across regions. In the Korean Peninsula, the radar observation network covers the entire country, providing high-resolution data on hydrometeors which is suitable for data assimilation (DA). During the pre-processing stage, radar reflectivity is classified into hydrometeors (e.g., rain, snow, graupel) using the background temperature field. The mixing ratio of each hydrometeor is converted and inputted into a numerical model. Moreover, assimilating saturated water vapor mixing ratio and decomposing radar radial velocity into a three-dimensional wind vector improves the atmospheric dynamic field. This study presents radar DA experiments using a numerical prediction model to enhance the wind, water vapor, and hydrometeor mixing ratio information. The impact of radar DA on precipitation prediction is analyzed separately for each radar component. Assimilating radial velocity improves the dynamic field, while assimilating hydrometeor mixing ratio reduces the spin-up period in cloud microphysical processes, simulating initial precipitation growth. Assimilating water vapor mixing ratio further captures a moist atmospheric environment, maintaining continuous growth of hydrometeors, resulting in concentrated heavy rainfall. Overall, the radar DA experiment showed a 32.78% improvement in precipitation forecast accuracy compared to experiments without DA across four cases. Further research in related fields is necessary to improve predictions of mesoscale heavy rainfall in South Korea, mitigating its impact on human life and property.

• 대기
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• 제19권1호
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• pp.37-51
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• 2009

Kinematic characteristics of a heavy rainfall event occurred in Changma front are analyzed using synoptic weather charts, satellite imagery and NCEP(National Centers for Environmental Prediction) / NCAR(National Centers for Atmospheric Research) reanalysis data. The heavy rainfall is accompanied with mesoscale rain clouds developing over the Southwest region of Korea during the period from 0300 LST to 2100 LST 25 June 2006. The surface cyclone in the Changma front is generated and developed rapidly when it meets following vertical conditions: The maximum value of relative vorticity is appeared at 700 hPa and is extended gradually near the surface. It is thought that the vertical structure of relative vorticity is closely related with the descent of strong wind zone exceeding $10ms^{-1}$. The jet core at 200 hPa is shifted southward and extended downward and the low-level jet stream associated with upper-level jet stream appeared at 850 hPa. Kinematic features of heavy rainfall system at cyclone-generating point are as follows: In the generating stage of cyclone, the relative vorticity below 850 hPa increased and the convergence below 850 hPa and the divergence at 400 hPa are intensified by southward movement of jet core at 200 hPa. The heavy rainfall system seems to locate to the south of the exit region of upper-level jet streak; In the developing stage of cyclone, the relative vorticity below 850 hPa and the convergence near surface are further strengthened and upward vertical velocity between 850 hPa and 200 hPa is increased.

• 한국물환경학회지
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• 제20권5호
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• pp.494-499
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• 2004

Growth in population and urbanization has progressively increased the loadings of pollutants from non-point sources as well as point sources. Therefore, it is necessary to manage both point and non-point sources contaminations for protecting water environment and improving water quality. This study investigated the characteristics of pollutant release over a wide range of rainfall intensities as a requisite to control road runoff that accounts for the largest portion of non-point source contamination in urban areas. Samples of runoff rainwater collected from real road surfaces were analyzed for physicochemical parameters such as pH, suspended solids, and heavy metals. A experimental model road ($30cm{\times}30cm$) was also used to evaluate wash-off properties of pollutants deposited on the surface as functions of time and rainfall intensity. Analysis of runoff samples on rain events showed that the pollutant wash-off patterns for heavy metal and suspended solids were similar. This implies that the particles in rainwater adsorb heavy metals. Experiments using the model road made of impervious asphalt demonstrate a strong first flush phenomenon. At high rainfall intensity, approximately 80% of total pollutants were released within 15 min. The pollutant wash-off rates rapidly increase from 9 mm/hr to 12 mm/hr of rainfall intensity and decrease over 12 mm/hr of rainfall intensity.

• 산업기술연구
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• 제27권B호
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• pp.193-199
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• 2007

This paper is a result of a case study about landslides at Whacheon area in Kangwondo occurred during heavy rainfall in 2006. A-day-accumulative rainfalls from July 12 to July 13 and July 15 to July 16 were 120mm and 110mm respectively. Five sites at which slope failures occurred were visited to figure out main causes of slope failures by investigating characteristics of rainfall, geological formation, topography and ground surface exploration around the boundary of the landslides. Based on the site investigation characteristics of landslide with respect to rainfall pattern, geological and topographical condition and pattern of landslide were evaluated.

• 산업기술연구
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• 제29권A호
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• pp.9-17
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• 2009

The main purpose of this work is to analyse damages caused by debris flows during the heavy rainfall at Inje province in Kangwondo, Korea. A series of site investigations have been performed to survey the characteristics of debris flows occurred during the summer season of 2006. It has been found that major losses and costs are triggered by discharge of soil and rock fragments from landslides. During the rainfall unexpectedly high precipitation rate of 113.5mm/hour and 355mm/day was recorded, which could happen at a 80-500 year period. Comparing the period of the rainfall with the time of the landslides, it has been found that the occurrence of the landslides is directly related to heavy rainfalls. At present, several debris barriers have been built at the valleys and natural slopes have been protected by the seed spray method. It is intended to propose an appropriate solutions of restoration of landslide damages and maintenance based on findings from the current study.