• 한국안전학회지
• /
• 제33권2호
• /
• pp.132-137
• /
• 2018

Compared with general rivers, fluctuations of the water level and the river bed are severe in the tidal river. In hydro-dynamic aspect, such fluctuation gives different river-bed data to us according to observing period. The time-dependent river-bed data and pre-estimation of the Manning's roughness coefficient which is the key factor of numerical modelling induces uncertainty of evaluating the design flood level. Thus it is necessary to pay more attention to calculate the flood level at tidal rivers than at general rivers. In this study, downstream of the Imjin River where is affected by tide of the West Sea selected as a study site. From the numerical modelling, it was shown that the unsteady simulation gave considerable mitigation of the water level from the starting point to 15 km upstream compared to the steady simulation. Either making a detention pond or optional dredging was not effective to mitigate the flood level at Gugok - Majung region where is located in the downstream of the Imjin River. Therefore, a more sophisticated approach is required to evaluate the design flood level estimation before constructive measures adopted in general rivers when establishing the flood control plan in a tidal river.

• 한국실내디자인학회:학술대회논문집
• /
• 한국실내디자인학회 2002년도 춘계학술발표대회 논문집
• /
• pp.154-158
• /
• 2002

The object of this study is to find out our present exterior color palette of the apartment buildings by Han River, which represents the visual image of Seoul, to reveal how well it is harmonized with its surroundings along with the last 10 years researches, and to compare its correspondence with the city plan of Seoul. Furthermore, it is the ultimate purpose to prepare source materials for desirable color plan of the city.

• 한국습지학회지
• /
• 제9권3호
• /
• pp.51-61
• /
• 2007

자연하천은 하천개수사업, 유역의 토지이용 변화, 댐 및 저수지 건설, 골재채취 등 여러 가지 요인에 의해 하상이 변동하게 된다. 이러한 하상변동은 하천정비 및 다양한 습지계획, 안정하도 유지관리를 위해 매우 중요한 사항이다. 본 연구에서는 골재채취로 인해 저하된 하상이 점차 안정화 되어가고 있는 금강 및 미호천 국가하천 구간을 대상으로 하천측량, 하상재료 채취 분석을 실시하고, 이를 토대로 하도 형성을 지배하는 하도특성량 분석과 수치모형에 의해 장래 하상변동을 예측하였다. 연구결과 하상경사 및 마찰속도 등 하도특성량을 통해 분석한 하상변동 잠재성 평가 결과와 수치모형을 이용한 하상변동 예측결과가 비슷한 경향을 나타냈으며, 금강 및 미호천은 장래 하도가 안정화될 것으로 분석되었다. 이와 같이 장래 하상의 세굴 또는 퇴적경향 등을 예측하고 그 특성을 반영하면, 치수적인 대책 수립과 수리적으로 안전한 구간에서의 식생호안 설치 등 치수적으로 안전하고 친환경적인 하천 및 습지계획이 가능할 것이다.

• 한국습지학회지
• /
• 제4권2호
• /
• pp.57-66
• /
• 2002

The local storm occurred Nakdong river basin from August 4 to 11 of the year 2002, resulting in a record 500-600mm rainfall. The heavy rain continued for more than 10 days and especially between 3 to 4 am of August 9, 50mm per hour local storm occurred in Hanrim-myun area, Kimhae. 8 days after the storm, the water level of Nakdong river rose rapidly and the river flowed backward the branches. T he draining of the protected low wetland was unable and the water level of the inner bank area rose suddenly, causing the inundation in several areas. Baeksan bank of Nam river, Gahyun(Samhak) bank of Hwang river, and Kwangam bank of Shinban river, where the draining facilities were under construction or constructed recently, were failed by the piping around the draining culvert. This study analyze the cause of the damage in Nakdong river banks and suggests the countermeasures for future improvement. The damaged spot of the river bank was surveyed, and the rainfall and the fluctuation in the water levels were reviewed. Finally for the flood inundation prevention at the inner bank area, new floodplain management plan as the protect of low wetland established.

• 한국수자원학회논문집
• /
• 제54권12호
• /
• pp.1339-1348
• /
• 2021

하천법에 의거하여 국내 하천들에는 상당한 국가예산으로 하천정비기본계획이 5-10년 주기로 수립되고 있으며, 홍수위 계산을 위한 HEC-RAS 모의에 필요한 하천단면 등 다양한 하천측량이 실시되고 있다. 그러나, 하천측량자료들은 하천관리지리정보시스템(RIMGIS)에 pdf 보고서 형태로만 제공되고, 원자료는 CAD 형식으로 하천정비계획을 수행한 설계사 등이 분산 소유하고 있어 관리 부재로 망실의 우려도 있어, 다른 용도로의 활용성이 상당히 저하되어 있는 실정이다. 그리고, 측량된 CAD 형식의 단면자료 등을 HEC-RAS에 활용할 때, 'Dream'과 같은 툴을 활용하나 거의 수작업에 가까운 시간과 비용이 소요되는 현실에 있다. 본 연구에서는 이러한 문제들을 해결할 수 있는 툴인 RAUT(River information Auto Upload Tool)를 개발하였다. RAUT 툴은 첫째, 실무에서 하천기본계획 수립 시 활용되는 HEC-RAS 1차원 모형의 입력자료를 CAD 측량자료를 직접 수기로 입력 및 모의를 실시하는 복잡한 단계를 자동화시키고자 하였다. 둘째, 하천공간정보인 CAD측량 자료를 직접 읽어 표준 데이터 모델 (ArcRiver)기반 하천공간정보 DB에 자동 업로드하여 전국단위의 하천정비계획의 하천측량자료 관리가 가능하게 할 수 있다. 즉, 만약 RIMGIS가 RAUT와 같은 툴을 사용하면 하천단면과 같은 전국단위 하천측량 자료를 체계적으로 관리할 수 있게 된다는 의미이다. 개발한 RAUT는 제주도 한천유역을 대상으로 하천정비기본계획의 하천공간정보 CAD자료를 읽어들여 mySQL기반 공간 DB로 구축하고, 구축된 DB로부터 HEC-RAS 1차원 모의 실시하기 위한 지형자료를 자동으로 생성시키는 과정을 시범적으로 구현하였다.

• 한국물환경학회지
• /
• 제25권4호
• /
• pp.481-493
• /
• 2009

This study was conducted to performance appraisal of Total Maximum Daily Loads (TMDLs), especially in terms of performance on development & reduction plan and water quality status of unit watershed. Because load allocations for pollution sources were predicted redundantly by uncertainty of prediction, TMDLs master plan has been frequently changed to acquire load allocation for local development. Therefore, It need to be developed more resonable prediction techniques of water pollution sources to preventing the frequent change. It is suggested that the reduction amount have to be distributed properly during the planning period. In other words, it has not to be concentrated on the specific year (especially final year of the planning period). The reason why, if the reduction amount concentrate on the final year of the planning period, allotment loading amount could not be achieved in some cases (e.g., insufficiency of budget, extension of construction duration). If the development plan was developed including uncertain developments, it is necessary to be developed reduction plan considered with them. However, some of the plans in the reduction plan could not be accomplished in some case. Because, it is not considered financial abilities of local governments. Consequently, development plan must be accomplished to avoid uncertain developments, and to consider financial assistance to support the implementation of effective plan. Water quality has been improved in many unit watersheds due to the TMDLs, especially in geum river and yeongsang/seomjin river.

• 상하수도학회지
• /
• 제27권2호
• /
• pp.197-206
• /
• 2013

Recently, climate change causes climatic anomaly such as global warming, the typhoon and severe rain storm etc. and it brings damage frequently. Climate change and global warming are prevalent all over the world in this century and many researchers including hydrologists have studied on the climate change. In this study, Seonakdong river watershed in the Nakdong river basin was selected as a study area. Real-time monitoring system was used to draw the rating curves, which has 0.78 to 0.96 of $R^2$. To predict runoff change in Seonakdong river watershed caused by climate change, the change in hydrologic runoff were predicted using the watershed model, SWAT. As a result, the runoff from the Seonakdong river watershed was increased by up to 45 % in summer. Because of the non-point sources from the farmland and the urban area, the water quality will be affected by the climate change. In this study, the operating plan of the water gates in Seonakdong river will be suggested by considering the characteristics of the watershed runoff due to the climate change. The optimal watergate opening plan will solve the water pollution problems in the reservoir-like river.

• 한국농공학회논문집
• /
• 제55권3호
• /
• pp.1-7
• /
• 2013

The dam plan quantity of constructive and water supply quantity of present time are showing a difference with change in climate and augmentation of water demand for multipurpose dams in Nakdong river basin. But revaluates a water supply ability the method or the process is official for is not taking a position, so actual condition applies the plan quantity of dam constructive. Considers various situation of actual multipurpose dam from research sees consequently and in K-WEAP is an integrated water resources evaluation plan model applies as water permit availability multipurpose dam, currently water permit availability comparison, analyzed. In this study, the natural daily flow data and apply the dimensions of the reservoir, and for more than 30 years of the long-term water balance analysis conducted by Date Nakdong river basin can supply reservoirs are large quantity of permits available is presented.

• 기술사
• /
• 제5권20호
• /
• pp.11-17
• /
• 1972

• 한국안전학회지
• /
• 제38권2호
• /
• pp.81-86
• /
• 2023

In this study, a one-dimensional numerical model was constructed to propose a flood control plan linked with the dam and river basin for the flood events of the Seomjin River in 2020. The flood level reduction of the downstream river was tested based on a scenario operation of the Seomjingang Dam and was also analyzed when a storage pocket was newly constructed as one of the river basin measures. It was confirmed that Seomjingang Dam's flood control capacity would be increased if the flood limit level was drastically lowered from the current EL. 196.5 m to EL. 188.0 m. In addition, if the upper area of the (old) Geumgok Bridge (which suffered great damage due to the loss of the levee) is used as a storage pocket, it would be effective in preventing floods in the lower area of it. In the era of the climate crisis, more integrated flood management is needed and basic river management must be observed.