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.

하도합류부 주변에서 흐름의 수치해석

안승섭(Ahn Seung Seop),임동희(Yim Dong Hee),정도준(Jung Do Joon),최수철(Choi Soo Chaul) 대한토목학회 2006 대한토목학회 학술대회 Vol.2006 No.10

수변공간 개발지표 설정을 위한 이론적 고찰

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.

유역분할에 따른 유출특성의 변화

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.

지질형태와 토지이용특성을 고려한 도서지역의 지하수흐름특성 분석

안승섭 ( Seung-seop Ahn ),박노삼 ( Ro-sam Park ),박동일 ( Dong-il Park ),이상일 ( Sang-il Lee ) 한국환경기술학회 2011 한국환경기술학회지 Vol.12 No.1

화산도서지역의 유출곡선지수(CN)와 강우발생조건에 따른 지하수함양특성과 지하수흐름에 미치는 영향을 분석하였다. 제주시 지역의 최근 20년간 토지피복특성을 5년 단위로 구분하여 유출곡선지수에 대한 장기 지하수함양특성을 추정하였다. 또한, 강수량의 변화가 지하수 함양특성에 미치는 영향을 검토하기 위하여 제주시 지역의 최근 20년간 강수량을 조사하여 최다강수년과 평수년 및 최저강수년으로 구분하여 장기 지하수함양특성을 추정하여, 강수량 조건과 토지이용특성에 따른 지하수 함양율을 검토한 결과, 동일한 수문 지형학적조건에서 지하수 함양율은 강수량보다는 토지이용상태가 훨씬 큰 영향을 미치는 것으로 분석되었다. 또한 평균 지하수 함양량을 증·감시키면서 지하수위의 변화를 분석한 결과, 지하수 함양량이 감소할 경우가 증가할 경우보다 지하수 수위변화에 영향이 큰 것으로 분석되었다. 따라서 토지이용의 효율적 관리를 통하여 지하수 함양량을 적정하게 관리할 필요가 있음을 알 수 있었다. The characteristics of groundwater recharge and its effect on the flow of ground water according to the runoff curve number of volcanic islands and rainfall conditions, have been analyzed. The characteristics of Jeju City`s land cover in the past 20 years has been classified with 5 years unit and the long-term characteristics of groundwater recharge with regard to curve number has been estimated. In addition, in order to review the effect of the change of precipitation on the characteristics of groundwater recharge, the precipitation around Jeju city in the past 20 years has been investigated and classified into the year of highest rainfall, the year of average rainfall and the year of the least rainfall, and then the long-term characteristics of groundwater recharge has been estimated. As a result of the review on the groundwater recharge rate according to rainfall conditions land use pattern, under the identical hydro-geomorphological conditions, the state of land use has greater effect on the groundwater recharge rate than the rainfall does. In addition, the change of groundwater level has been analyzed by increasing or decreasing the average groundwater level. As a result, the decrease of groundwater recharge has greater effect on the groundwater level than the increase of the groundwater recharge. Thus, it is known that the appropriate management of the groundwater recharge through the efficient control of land use is required.

AGNPS 모형을 이용한 비점원 오염물의 예측(II) - 확률강우량을 중심으로-

안승섭 ( Ahn Seung-seop ),박노삼 ( Park Ro-sam ),이증석 ( Lee Jeung-seok ),최윤영 ( Choi Yun-young ),심창석 ( Sim Chang-seok ) 한국환경기술학회 2001 한국환경기술학회지 Vol.2 No.4

지하수 양수량에 따른 지하수유동 및 포획구간 특성 변화

안승섭 ( Seung Seop Ahn ),박동일 ( Dong Il Park ),오영훈 ( Young Hun Oh ) 한국환경과학회 2013 한국환경과학회지 Vol.22 No.7

This study analyzed on characteristics of the ground-water capture zone in coastal areas and mid-mountainous area according to pumping rate. For this study, it targeted Jejudo island where is the volcanic island. To analyze, MODFLOW model and MODPATH model, which are the ground-water flow analysis models, were used. As a result of research, the following conclusions could be obtained. As a result of analyzing influence of a change in pumping time upon length of capture zone, the length of capture zone in coastal area was indicated to be greater in the changing ratio compared to the length of capture zone in mid-mountainous area. Next, in the coastal area, the pumping rate and the capture-zone length are changing similarly. However, in mid-mountainous area, the length of capture zone was indicated to grow when the pumping rate comes to exceed 1,500m3/day. As a result of analyzing influence of a change in pumping time upon capture area, the tendency of a change in the area was indicated similarly in coastal areas and mid-mountainous area. Especially, it could be known that the larger pumping rate leads to the more definite increase in tendency to a change in capture area. Based on this study, it was allowed to be possibly used in the suitable pumping rate in coastal areas and mid-mountainous area of the volcano island in the future. A follow-up research is judged to necessarily analyze the influence of tubular-well group upon capture zone by additionally analyzing a change in capture zone targeting the concentrated tubular well.

자연하도 하구부의 방사보에 의한 수리학적특성 해석

안승섭(Seung-Seop Ahn),최윤영(Yun-Young Choi) 한국산업융합학회 2001 한국산업융합학회 논문집 Vol.4 No.1

This study examines the effects of removal of the sediment protection weir at Taehwa river mouth on hydraulic and around river environment considering the fact that the effects of the sediment protection weir which is installed to protect water level drop of Ulsan harbor caused by sediments according to flood in Taehwa river, Dong-chun, and so forth may add water quality contamination by flow stagnance in normal and drought period and accumulation of pollutants. The result is as follows.<br/> First, it is estimated from the examination of variation characteristics water depth and level for Taehwa river before and after removal of the sediment protection weir that about 0.01 m of water depth down according to removal of the sediment protection weir occurs when low flow runs between the sediment protection weir which is located about 2.3km away from the estuary and Samho-gyo which is about 9.0km away from the sediment protection weir, and about 0.01~0.56m(directly upstream point of the sediment protection weir 0.56m, Myongchon-gyo 0.14m, Ulsan-gyo 0.03m, and Taehwa-gyo 0.02m) downs when design flood flows between the sediment protection weir and the upstream of Taehwa-gyo which is 10km away from the sediment protection weir. Therefore, it is thought that variation of hydraulic characteristics of water depth down and so on according to removal of the sediment protection weir is slight because water depth variation is only about 1cm between directly upstream point of the sediment protection weir and Samho-gyo. Next, it is estimated from the examination of variation characteristics of flow velocity for Taehwa river before and after removal of the sediment protection weir that about 0.0lm/s of flow velocity increase occurs between the directly upstream point of the sediment protection weir which is about 2.4km away from the estuary and the directly upstream point of Samho-gyo when low flow runs, and about 0.01~0.44m/s increases between the sediment protection weir and Samho-gyo when design flood flows. Therefore, riverbed erosion by the increased flow velocity is concerned but it is thought that the concern about riverbed erosion is not great because the mean velocity is about 0.07~1.36m/s when low flow runs, and about 1.02~2.41m/s when design flood flows for the sector which experiences the flow velocity variation.<br/> <br/>

중소하천유역의 임계지속시간 결정에 관한 연구

안승섭 ( Seung Seop Ahn ),이효정 ( Hyeo Jung Lee ),정도준 ( Do June Jung ) 한국환경과학회 2007 한국환경과학회지 Vol.16 No.11

교각의 기하학적 형상에 따른 유사 및 유속의 변화 특성

안승섭 ( Seung Seop Ahn ),이효정 ( Hyo Jung Lee ),서명준 ( Myung Joon Seo ),이증석 ( Jeung Seok Lee ) 한국환경과학회 2009 한국환경과학회지 Vol.18 No.2