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HEC-6모형을 이용한 방사보 철거 전후에 따른 하상변동 특성
안승섭,이수식,최윤영,이증석,Ahn. Seung-Seop,Lee. Soo-Sik,Choi. Yun-Young,Lee. Jeung-Seok 한국방재학회 2001 한국방재학회논문집 Vol.1 No.3
본 연구에서는 HEC-6 모형을 이용하여 태화강 본류하도 하구부에 위치한 방사보의 영향에 따른 하상변동특성을 분석 검토함으로서, 향후 태화강 하도종합개발계획 수립시에 효과적으로 이용할 수 있도록 하였다. 하상변동특성 분석에 필요한 유량 조건은 태화강 하천정비기본계획수립에서 검토된 풍수량, 홍수량 및 계획홍수량 조건을 이용하였다. 먼저, 하상변동폭에 대한 분석 결과, 삼호교 하류 하도구간에서는 유하유량이 클수록 세굴과 퇴적이 활발히 진행되고 있으나 삼호교 상류 하도구간에서는 큰 변동이 없는 것으로 분석되었다. 다음으로, 유사이송능을 검토한 결과, 유하유량이 클수록 유사이송능은 큰 값으로 추정되었으나 계획홍수량 유하시 방사보 철거전후의 태화강 하구부의 유사이동능은 큰 차이가 없는 것으로 분석되었다. 따라서, 방사보 철거로 인한 토사유입량 감소대책을 고려하여 태화강 하류부에서 유입되는 동천지류의 최하류부에 하천유지용수 확보와 태화강으로의 유사량 유입을 감소시키기 위하여 적절한 수리 구조물을 설치한다면 방사보 제거 후에도 태화강 최하류부의 유사량 퇴적을 감소시키는 좋은 방안이 될 것으로 판단된다. In this study, the characteristics of river bed profile fluctuation are become possible to be used effectively in future estimation of Taehwa river general development plan through analysis and examination according to the effects of sediment protection weir located in the area of the estuary of Taehwa river`s main channel using HEC-6 model. The flow conditions needed in analysis of the characteristics of river bed profile fluctuation refer the conditions of flow which secures 95 days in a year, flood flow, and design flood examined in the estimation of Taehwa river maintenance basic plan. First, in analysis result of river bed variation range, there is no significant variation in upstream section from Samho-gyo while there are the more active erosion and sedimentation as the more flow in downstream from Samho-gyo. Next, from the result of the capacity of sediment transfer, it is analyzed that sediment transfer capacity in the area of estuary of Taehwa river has no significant difference in before and after removal of the sediment protection weir when design flood flows while it is estimated that the more flow, the bigger sediment transfer capacity. Therefore, it is thought that the installation of a suitable hydraulic structure at the lowest point of Dong-chun tributary joins from the downstream of Taehwa river can be a good device to reduce the accumulation of sediments at the lowest point of Taehwa river considering the reduction plan of sediment inflow caused by removal of the sediment protection weir.
안승섭 ( Seung-seop Ahn ),이상일 ( Sang-il Lee ),김정기 ( Jeung-ki Kim ),박동일 ( Dong-il Park ) 한국환경기술학회 2011 한국환경기술학회지 Vol.12 No.1
자연하천의 만곡부에서는 원심력에 의하여 수위상승 이나 침식 등으로 제방이 파괴되고 월류되어 홍수피해가 빈번하게 발생된다. 그러므로 자연하천의 만곡부는 하천정비 및 안정하도의 유지관리를 위해 매우 중요한 하도구간중의 하나이다. 본 연구에서는 하도 만곡부의 흐름특성 연구를 위하여 30°, 60° 및 90°로 만곡된 실험수로에 대한 유속, 편수위 및 편경사의 변화특성을 검토하였다. 분석결과 먼저, 만곡정도에 관계없이 유량이 증가할수록 만곡부의 최대·최소 유속차 또한 증가하는 것으로 검토되었다. 다음으로 90°만곡 지점에서 최대 횡방향 수면경사가 발생하였으며 직선하도에 비하여 약 4.6% 정도 기울어진 것으로 검토되었다. 본 연구의 결과에서 검토된 만곡하천의 수리특성과 편경사의 경향 등을 하천정비 또는 실시계획수립에 반영한다면 치수적으로 안전하고 보다 친환경적인 하천계획이 가능할 것으로 판단된다. A bend in a natural river is accompanied by frequent flood damage due to the destruction and overflow of banks caused by water level rises, erosion, etc. through centrifugal force. Therefore, a bend in a natural river is one of the very important river channel sections for the repair of rivers and the maintenance of stable river channels. This study reviewed the property of changes in flow velocity, superelevation and slope for a 30°, 60° and 90° curved open channel experiment device in order to study the flow property of a river channel bend. As a result of analysis, the maximum and minimum velocity also increased in a curve as flow rate increased regardless of the degree of bending. The maximum lateral water level slope took place at a 90° curve point, and its inclination was about 4.6% compared to the linear open channel. It is judged that reflecting the hydraulic property, slope tendency, etc. of a curved river reviewed by this study on the repair of a river and the establishment of its execution plan can make a dimensionally safe and more sustainable river plan.
안승섭 ( Seung Seop Ahn ),박동일 ( Dong Il Park ),최윤영 ( Yun Yeong Choi ),배상근 ( Sang Keun Bae ),차호섭 ( Ho Seop Cha ) 한국수처리학회 2010 한국수처리학회지 Vol.18 No.5
Groundwater is being greatly influenced by the state of land characteristics in which it will not change in a short period, and by fast changing characteristics of land use due to city development and urbanization. Thus, it is necessary to reflect the ever changing land use situation as a criteria of ground water development and management. This research analyzes the characteristics of groundwater recharge and the characteristics of land change. It is important to note that the characteristics of groundwater recharge uses the Soil and Water Assessment Tool (SWAT) mode, which is an analytical model for a long period widely used both home and abroad, and that the characteristics of land change is a major medium of assessment of groundwater recharge at a target area. For the analysis of long term recharge to take into consideration of land use change at the research area, the researchers conducted an analysis by using the land use level at intervals of five years through the process of data entry of twenty years worth of climate data from the years of 1985 to 2004. The result of the analysis provided shows that the average recharge rate was 41 .9% with average precipitation of 1553.8mm and average recharge of groundwater being 658.8mm. Underground water recharge subsequent to land use change showed recharge rates to be 43.1% in 1985, 42.5% in 1990,41.4% in 1995, and 40.7% in 2000. It is hoped t7hat the research results will make it possible for follow up research work to create the optimum developable amounts of groundwater at the island region: set up a criteria of efficient groundwater preservation and management through assessing an accurate recharge of groundwater according to the change in land use.
안승섭 ( Seung-seop Ahn ),정도준 ( Joon-do Jung ),박노삼 ( Ro-sampark ) 한국환경기술학회 2005 한국환경기술학회지 Vol.6 No.4
수자원분야에서 GIS를 이용한 유역의 지형인자 추출 및 수문모형의 매개변수 추출에 대한 많은 연구가 진행되고 있다. 그러나 아직까지 이러한 방법들에 대한 명확한 기준은 정립되어 있지 않은 상태이다. 본 연구에서는 집중형 모형을 적용함에 있어서 동일 특성으로 구분되어 지는 유역분할에 따른 유출 응답특성의 변화에 대해서 검토하고자 한다. GIS를 이용한 유역의 분할과 수문학적 지형인자 및 매개변수의 계상을 위하여 WMS를 사용하였으며, 유출응답 특성이 규명을 위한 수문모형으로는 HEC-1을 사용하였다. Many researches have been conducting on extracting geometry data and hydrologic parameters by using GIS technique. However, there is no clear standard on those methods yet. This study examines the changing pattern of runoff responses characteristics with applying lumped model on divided watershed. WMS is used in order to divide watershed and calculate hydrologic geometry data and parameters by GIS technique. HEC-1 is adopted as a hydrologic model to establish runoff responses. The basin is divided into small watersheds, which are approximately same size.
안승섭 ( Seung-seop Ahn ),박기범 ( Ki-bum Park ),박창범 ( Chang-bum Park ) 한국환경기술학회 2022 한국환경기술학회지 Vol.23 No.6
In this study, factors to be considered in planning and evaluating the waterfront space were reviewed. Although many previous studies have been carried out on waterfront space planning, research has been conducted in terms of urban planning, spatial design, river planning, or hydrology, respectively. First, the existing urban planning elements and spatial elements, which have been extensively reviewed and studied in the waterfront space plan, were integrated into functional elements to present review items. Second, in the case of storytelling, which is an essential element for spatially and functionally materialized by giving conceptual meaning to creating a waterfront space, Finally, hydrological design elements are presented as important design elements for waterfront space planning. It is judged to be an essential element for smooth water supply and management in planning the waterfront space by suggesting items on water supply, flood protection, and water quality and water circulation constituting the waterfront space.