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- 발행기관 : The Korean Society of Engineering Geology (검색결과 2 건)
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채병곤,조용찬,Chae, Byung-Gon,Liu, Ko-Fei,Cho, Yang-Chan The Korean Society of Engineering Geology 2008 지질공학 Vol.18 No.2
이 연구는 집중호우시 산사태의 발생가능성과 발생시간을 사전에 예측하기 위한 노력의 일환으로 기존에 개발된 RTI 경보모델을 우리나라에 적용 분석한 사례이다. RTI(Rainfall Triggering Index)는 강우강도(I) 유효 누적강우량($R_t$)의 곱으로 정의되는 것으로서, 강우기간 동안 특정 시간(t)에서 산사태가 발생할 가능성을 평가하는데 사용된다. RTI의 상부임계값($RTI_{UC}$)과 하부임계값($RTI_{LC}$) 과거 산사태 발생시 강우자료 분석을 통해 각 지역별로 설정할 수 있으며, 강우강도가 상부임계값을 초과할 때 실제 산사태가 발생하는 것으로 이해할 수 있다. 이러한 분석은 궁극적으로 향후 집중호우가 내릴 경우 특정지역의 산사태 발생가능성은 물론 산사태 발생시기를 예상할 수 있으며, 이를 토대로 사전에 산사태 발생경보를 발령하는데 중요한 근거로 활용될 수 있다. 이와 같은 이론을 우리나라에 적용하기 위해 2006년 7월 13일부터 7월 19일까지 강원도 인제군 일대에 내린 강우자료와 산사태 발생과의 관계를 분석한 결과, 실제 산사태가 발생한 7월16일 오전 11시경을 기준으로 23시간, 11시간, 9시간 전에 강우강도가 RTI의 상부임계값을 초과하였다. 이를 토대로 이와 같은 세 차례에 걸친 산사태 경보의 발령이 필요하였음을 알 수 있었다. This study is a case study for application of the RTI warning model to Korea which was previously developed to predict landslide potential and occurrence time during a rainfall event. The rainfall triggering index (RTI) is defined as the product of the rainfall intensity I (mm/hr) and the effective accumulated rainfall $R_t$ (mm). This index is used to evaluate the landslide and debris-flow occurrence potential at time t during a rainfall event. The upper critical value ($RTI_{UC}$) of RTI and the lower critical value ($RTI_{LC}$) of RTI can be determined by historical rainfall data of a certain area. When the rainfall intensity exceeds the upper critical value, there are high potential to occur land-slides. The analysis result can predict landslide occurrence time of an area during a rainfall event as well as land-slide potential. The result can also be used as an important data to issue early-warning of landslides. In order to apply the RTI warning model to Korea this study analyzed rainfall data and landslides data in Inje county, Gangwon province, Korea from July 13 to July 19, 2006. According to the analysis result, the rainfall intensity exceeded the upper critical value 23 hours ago, 11 hours ago, and 9 hours ago from 11:00 in the morning, July 16. Therefore, landslide warnings would be issued three times for people evacuation for avoiding or reducing hurts and dam-ages from landslides in mountainous areas of Inje.
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Damage Proxy Map over Collapsed Structure in Ansan Using COSMO-SkyMed Data
Nur, Arip Syaripudin,Fadhillah, Muhammad Fulki,Jung, Young-Hoon,Nam, Boo Hyun,Kim, Yong Je,Park, Yu-Chul,Lee, Chang-Wook The Korean Society of Engineering Geology 2022 지질공학 Vol.32 No.3
An area under construction for a living facility collapsed around 12:48 KST on 13 January 2021 in Sa-dong, Ansan-si, Gyeonggi-do. There were no casualties due to the rapid evacuation measure, but part of the temporary retaining facility collapsed, and several cracks occurred in the adjacent road on the south side. This study used the potential of synthetic aperture radar (SAR) satellite for surface property changes that lies in backscattering characteristic to map the collapsed structure. The interferometric SAR technique can make a direct measurement of the decorrelation among different acquisition dates by integrating both amplitude and phase information. The damage proxy map (DPM) technique has been employed using four high-resolution Constellation of Small Satellites for Mediterranean basin Observation (COSMO-SkyMed) data spanning from 2020 to 2021 during ascending observation to analyze the collapse of the construction. DPM relies on the difference of pre- and co-event interferometric coherences to depict anomalous changes that indicate collapsed structure in the study area. The DPMs were displayed in a color scale that indicates an increasingly more significant ground surface change in the area covered by the pixels, depicting the collapsed structure. Therefore, the DPM technique with SAR data can be used for damage assessment with accurate and comprehensive detection after an event. In addition, we classify the amplitude information using support vector machine (SVM) and maximum likelihood classification algorithms. An investigation committee was formed to determine the cause of the collapse of the retaining wall and to suggest technical and institutional measures and alternatives to prevent similar incidents from reoccurring. The report from the committee revealed that the incident was caused by a combination of factors that were not carried out properly.
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