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수치모형을 이용한 사방댐 설치위치에 따른 토석류 저감량 분석
Won Jun Tak,Kye W on Jun,Byung Sik Kim,Yong Ho Yoon 위기관리 이론과 실천 2017 Crisisonomy Vol.13 No.4
최근 국내에서는 이상기온으로 인한 국지성 폭우와 여름철 태풍 및 집중호우로 인한 다양한 재해가 발생되고 있으며 재해유형중에서도 산지재해에 속하는 토석류가 급증하고 있다. 토석류는 산지에서 일어나는 것으로 한정하기 쉬우나, 도심과 인접한 산지지역에서 토석류가 발생하여 도심지 및 고속 도로, 교량 등에 큰 피해를 불러오기도 한다. 이처럼 토석류는 산지와 도심지 모두 발생 위험성이 높고 피해범위 또한 예측이 쉽지 않아 토석류에 대해 여러분야로 연구가 이루어지고 있다. 이 중에 서도 토석류를 제어하는 가장 효과적인 구조물로 토석류 유출방지시설에 대한 연구가 많이 이루어 지고 있지만 토석류가 발생하거나 또는 토석류 위험지역의 유역특성이나 현장여건을 적용한 토석류 유출저감시설의 위치에 대한 연구는 미비한 상태이다. 따라서, 본 연구에서는 토석류 수치모형을 이용하여 토석류 발생시 이동 메커니즘과 토석류 유출방지시설의 위치별 저감효과를 분석하였다. Recently, South Korea has been facing a range of disasters caused by localized heavy rainfalls, tropical typhoon, and torrential downpours. In particular, debris flows disasters usually occurring in the mountains have rapidly increased during the past few years. However, debris flows are also observed in mountainous areas near cities, bringing significant damages to city centers, highways, bridges, etc. Thereby, debris flows can lead to high risk in both mountainous areas and city centers. In addition, difficulties in debris-flow forecasting increase the need for numerical studies on debris flows. Although various researches have widely been conducted on run-off control facilities for debris flows, it is necessary to focus more on research that would identify an ideal location for debris flow runoff reduction facilities based on basin characteristics or site conditions for the debris flow areas. In this regard, this research used a debris flow numerical model to identify the transfer mechanism of debris flows and analyzed the debris flow reduction effect of runoff control facilities by the installation location.
Ho Jin Lee,Won June Tak,Kye Won Jun 위기관리 이론과 실천 2015 Crisisonomy Vol.11 No.2
산지가 많은 국내에서는 여름철 태풍과 집중호우에 의한 영향으로 토사재해의 피해가 증가하는 추세이며, 산림뿐만 아니라 도심과 인접한 산지지역에서도 발생 빈도가 증가하고 있다. 특히 최근에는 토석류에 의한 인명피해와 재산피해가 급증하고 있어 토석류에 대한 방재적인 측면에서의 예방과 대응이 필요하다. 따라서 본 연구에서는 토석류 피해지역의 지형자료 구축을 위해 지상 LiDAR에 의한 측정자료를 이용하여 고정밀도 DEM을 생성하고 토사유출량을 산정하였고 토석류 피해지역에 수치해석 모형인 RAMMS 모형을 적용하여 토석류의 이동특성을 파악하고 확산범위를 산정하였다. 그 결과 RAMMS 모형에 의해 산정된 토석류 확산범위는 실제 피해가 발생한 지역에서 측정한 실측자료와 비교시 종·횡방향으로 모두 유사하게 모의되었다. In mountainous areas in Korea, there is increasing damage caused by landslide disasters due to the effects of typhoons and heavy rainfall in summer, and there is an increase in the frequency not only in the forest but also in mountainous areas adjacent to downtown. In particular, because there has recently been a rapid increase in life and property damage caused by debris flow, the prevention and responses are required from the perspective of disaster prevention. Therefore, this study generated a high-resolution DEM and calculated the sediment yield using the measured data by terrestrial LiDAR for establishing topographic data in the areas affected by debris flow. It also understood the movement characteristics of the debris flow and calculated the extent of damage by applying the RAMMS model, a numerical analysis model, to the areas affected by debris flow. As a result, the extend of debris flow calculated by the RAMMS model was similarly simulated in the longitudinal and transverse directions in comparison with the actual measured data on the affected areas.
An Experimental Study on Sediment Discharge in River Channel for the Reduction of Sediment Disaster
Kye Won Jun,Mu Pyung Baek,Jong Ho Choi 위기관리 이론과 실천 2017 Crisisonomy Vol.13 No.9
최근 기후변화의 영향으로 집중호우 및 토사재해 발생빈도가 증가하고 있다. 이러한 토사재해로 인한 하도 내 피해예방 및 종합적인 토사 관리를 위해서는 정량적이고 시계열적인 토사이동량 파악 이 필수적이다. 그러나 우리나라의 재래식관측기를 이용한 직접적인 측정방법은 실제 측정이 용이 하지 않고 많은 비용과 인력, 시간이 소요된다. 특히 연속적인 측정이 거의 불가능한 상태에 있어 토사 이송에 관한 수문학적 요인과 메커니즘 관계를 정량적으로 분석한 연구는 부족한 실정에 있다. 따라서 본 연구에서는 하도 내 토사이동량 측정의 어려움을 개선하기 위해 실내수로실험에 하이드 로폰을 활용하였고 하이드로폰의 인지능력을 파악하기 위해 충돌음향 계측 및 분석을 수행하였다. 연구결과 하이드로폰이 인지할 수 있는 개별입자별 main충돌시의 최소 임계치 기준은 공급유량과 토사입자의 크기가 커질수록 증가하는 것으로 나타났다. Due to recent climate change, the frequency of heavy rainfalls and sediment disasters is increasing. In order to prevent damages caused by sediment disaster and implement a comprehensive sediment control, a time-series analysis of sediment discharge data is essential. However, in South Korea, it is difficult to measure them directly as they use conventional meters as measurement, which prevents research from presenting a quantitative relationship between hydrological factors and mechanisms with regard to sediment transport. In this regard, the study attempted to overcome difficulties related to the measurement of soil particle transport in river channel. It used acoustic signals to recognize the transport of sediment particles and established an indoor waterway experiment equipment with a hydrophone. As a result, it is found that the minimum threshold value for the main collision of individual particles perceived by hydrophone increased as the supply flow rate and the size of sediment particles increased.
A negative airway reversibility test in chronic obstructive pulmonary disease
( Jae Ho Seong ),( Myoung Kyu Lee ),( Seok Jeong Lee ),( Sang Ha Kim ),( Suk Joong Yong ),( Kye Chul Shin ),( Ye Ryung Jung ),( Won Yeon Lee ) 대한내과학회 2013 대한내과학회 추계학술발표논문집 Vol.2013 No.1
Purpose: Even though reversibility test is negative in chronic obstructive pulmonary disease (COPD), some patients` Forced expiratory volume in 1 second (FEV1) is significantly increased after long-term inhaled bronchodilator therapy. So, we analyzed the differences between the patients who showed significantly increased pulmonary function and who did not after three months follow-up spirometry. Materials and Methods: We reviewed total 328 COPD patients who showed negative airway reversibility test (ART). And we checked age, sex, body mass index, smoking status, current medications, initial and follow-up spirometry. Results: The patients had the mean age of 66.0±9.6 years with 82 (23.7%) female. At follow-up spirometry, the delta FEV1 (L) was 0.21±0.29, and delta FEV1 (%) was 9.6±14.1. In ART, post-bronchodilator FEV1 (%) was more increased in delta FEV1 ≥ 12% than delta FEV1 <12% (8.1±6.6 vs. 5.1 ± 5.3, p<0.001). Current smoker was significantly lower in delta FEV1 ≥ 12% group (7.9% vs. 29.2%, p<0.001). And also the subjects with positive ART (≥12%) was higher in delta FEV1 ≥12% group (28.6% vs. 12.4%, p<0.001). But, between post-bronchodilator FEV1 (%) after ART and delta FEV1 (%), Pearson`s correlation showed mild significant correlation (r=0.232, p<0.001). Conclusion: we suggest that negative ART result did not mean the FEV1 limit that could increase after bronchodilator treatment in COPD, and even if ART was negative, delta FEV1 (%) was more increased in follow-up spirometry as post-bronchodilator FEV1 (%) change was higher in initial spirometry. Purpose: Even though reversibility test is negative in chronic obstructive pulmonary disease (COPD), some patients` Forced expiratory volume in 1 second (FEV1) is significantly increased after long-term inhaled bronchodilator therapy. So, we analyzed the differences between the patients who showed significantly increased pulmonary function and who did not after three months follow-up spirometry. Materials and Methods: We reviewed total 328 COPD patients who showed negative airway reversibility test (ART). And we checked age, sex, body mass index, smoking status, current medications, initial and follow-up spirometry. Results: The patients had the mean age of 66.0±9.6 years with 82 (23.7%) female. At follow-up spirometry, the delta FEV1 (L) was 0.21±0.29, and delta FEV1 (%) was 9.6±14.1. In ART, post-bronchodilator FEV1 (%) was more increased in delta FEV1 ≥ 12% than delta FEV1 <12% (8.1±6.6 vs. 5.1 ± 5.3, p<0.001). Current smoker was significantly lower in delta FEV1 ≥ 12% group (7.9% vs. 29.2%, p<0.001). And also the subjects with positive ART (≥12%) was higher in delta FEV1 ≥12% group (28.6% vs. 12.4%, p<0.001). But, between post-bronchodilator FEV1 (%) after ART and delta FEV1 (%), Pearson`s correlation showed mild significant correlation (r=0.232, p<0.001). Conclusion: we suggest that negative ART result did not mean the FEV1 limit that could increase after bronchodilator treatment in COPD, and even if ART was negative, delta FEV1 (%) was more increased in follow-up spirometry as post-bronchodilator FEV1 (%) change was higher in initial spirometry.