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배덕원,김형준,윤광석,Bae,Deok-Won,Kim,Hyung-Jun,Yoon,Kwang-Seok 한국방재학회 2011 한국방재학회논문집 Vol.11 No.6
일반적으로 하천에서 취수나 하상유지를 위하여 설치되는 하천횡단구조물은 구조물 영향에 의해 국부적으로 유속이 증가하여 연결호안을 유실시킴으로서 제방붕괴에 따른 홍수피해가 가중될 수 있다. 또한, 현재 연결호안은 설계시 뚜렷한 설계기준이 없이 경험적인 판단에 의해 안전성을 판단함으로서 과소설계 또는 과대설계 될 우려가 있다. 본 연구에서는 하천횡단구조물 연결호안 설계기법의 개선점을 도출하기 위해 사석 및 블록호안에 대하여 수리실험을 수행하였다. 실험결과를 바탕으로 연결호안 설계시 1차원 접근유속을 대표유속으로 적용하는 방법의 특성을 파악하고 이탈조건에서의 국부유속을 고려한 호안재료 제원 및 연결호안 설치길이 결정 경험식을 제안하였다. The river-crossing structures are constructed to maintain river bed. Revetment is a structure which is installed around connection to protect weak points between levee and river-crossing structures from flood. It is, however, possible that revetment is collapsed by local velocity which is increased around structures. In addition, it is possible that design value is overestimated or underestimated since the stability of revetment is assessed based on empirical judgments without clear criteria. This study is focused on the improvement of techniques for revetments design around river-crossing structures through laboratory experiments on riprap and concrete block. The experimental results were used to figure out methods applying local velocity in the condition of collapse. As a result, the empirical formula, such as the sizes and the stability length of revetment, reflecting local velocity on the slope was proposed.
김형준,배덕원,윤광석,Kim,Hyung-Jun,Bae,Deok-Won,Yoon,Kwang-Seok 한국방재학회 2011 한국방재학회논문집 Vol.11 No.6
강변저류지는 홍수저감효과 뿐만 아니라 생태적인 목적으로도 활용이 가능하여 최근 강변저류지 설치에 관한 연구가 활발히 진행되고 있는 상황이다. 그러나, 강변저류지 설치에 따른 홍수저감효과는 기존에 개발된 수치모형에 의존하고 있으며, 수리모형을 통한 기초연구가 부족한 상황이다. 본 연구에서는 강변저류지의 홍수저감효과를 분석하기 위하여 부정류 수리실험을 수행하였다. 강변저류지 설계시 고려인자인 설치위치, 유입부 마루높이 및 강변저류지 면적 등을 수리실험에서 다양한 조건으로 반영하여 수리실험을 수행하였다. 강변저류지의 홍수저감효과는 설치위치가 가까운 경우 가장 효과가 클 것으로 판단되며, 월류부 마루높이는 최대한 낮게 설치하는 것이 홍수저감에 효과적인 것으로 나타났다. 강변저류지 면적이 커질수록 홍수저감효과 또한 증가하지만, 기대할 수 있는 최대저감효과는 한계값에 수렴할 것으로 판단된다. 본 연구를 통하여 관측되고 분석된 결과는 강변저류지 설계시 유용하게 활용될 수 있을 것으로 판단된다. Detention basin is highly effective hydraulic structure which is available for flood mitigation and ecological characteristics. However, analysis of flood mitigation by detention basin is performed with numerical approaches only, there is not enough data obtained by experimental observation. In this study, physical experiment were performed under unsteady flow condition to analyze flood mitigation with detention basin. Various design factors such as location, later weir height and extent of detention basin were considered in this experimental observations. As the distance from detention base to target location become closer and later weir height become higher, we can expect more effective flood mitigation. As the area of detention basin area become lager, we also expect more higher flood mitigation effects. But, the flood mitigation effects from detention basin would converged to critical value. The obtained data will be useful for following studies about detention basin.
K-Means Clustering 기법과 원격탐사 자료를 활용한 탄소기반 글로벌 해양 생태구역 분류
김영준,배덕원,임정호,정시훈,추민기,한대현,Young Jun Kim,Dukwon Bae,Jungho Im,Sihun Jung,Minki Choo,Daehyeon Han 대한원격탐사학회 2023 大韓遠隔探査學會誌 Vol.39 No.5
An acceleration of climate change in recent years has led to increased attention towards 'blue carbon' which refers to the carbon captured by the ocean. However, our comprehension of marine ecosystems is still incomplete. This study classified and analyzed global marine eco-provinces using k-means clustering considering carbon cycling. We utilized five input variables during the past 20 years (2001-2020): Carbon-based Productivity Model (CbPM) Net Primary Production (NPP), particulate inorganic and organic carbon (PIC and POC), sea surface salinity (SSS), and sea surface temperature (SST). A total of nine eco-provinces were classified through an optimization process, and the spatial distribution and environmental characteristics of each province were analyzed. Among them, five provinces showed characteristics of open oceans, while four provinces reflected characteristics of coastal and high-latitude regions. Furthermore, a qualitative comparison was conducted with previous studies regarding marine ecological zones to provide a detailed analysis of the features of nine eco-provinces considering carbon cycling. Finally, we examined the changes in nine eco-provinces for four periods in the past (2001-2005, 2006-2010, 2011-2015, and 2016-2020). Rapid changes in coastal ecosystems were observed, and especially, significant decreases in the eco-provinces having higher productivity by large freshwater inflow were identified. Our findings can serve as valuable reference material for marine ecosystem classification and coastal management, with consideration of carbon cycling and ongoing climate changes. The findings can also be employed in the development of guidelines for the systematic management of vulnerable coastal regions to climate change.