• 수산경영론집
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• 제53권2호
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• pp.1-20
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• 2022

This study is aimed to analyze fishermen's perception and the economic feasibility of inland waters ranching project on the branches of Geum River. Analysis of fishermen's perception on the branches of Geum River showed that fishermen had an affirmative response on the inland freshwater ranching project related issues such as fisheries resources enhancement, necessity of project, economic achievement as so on. The model of inland waters ranching project on the branches of Geum River is designed to fisheries resources enhancement, habitat compositiom, ecology tours, use and management of resources. The results of the economic feasibility of inland waters ranching project on the branches of Geum River were internal rate of return (IRR) was 18.43%, a benefit-cost ratio was shown to be 1.54, net present value (NPV) was 4,929 thousand won, which indicates the economic feasibility of inland waters ranching project.

• Environmental Engineering Research
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• 제17권2호
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• pp.95-102
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• 2012

To evaluate the effect of the 4 major rivers restoration project in the Nakdong River to water quality of the river, the Environmental Fluid Dynamics Code (EFDC) and Water Quality Analysis Simulation Program (WASP), are applied in series. Results showed overall decrease in biochemical oxygen demand ($BOD_5$) concentrations and increase in chlorophyll-a concentrations, while total nitrogen and total phosphorous concentrations did not show significant changes, relatively. Decrease in $BOD_5$ concentrations seems to be influenced by an increased hydraulic residence time, which may allow more time for the degradation of organic material. Changes in Chlorophyll-a (Chl-a) concentration, due to the project were more significant for the upper stream areas that show relatively low Chl-a concentration ranges (less than 20 g/L). After the introduction of the Geumho River in the middle part of the Nakdong River, rapid growth of phytoplankton was observed. However, in this middle part of the Nakdong River, the ratio of Chl-a concentration change are less significant, compared to the upper stream areas, due to the project. In the lower stream area, Chl-a concentration decreased after the project. This seems to be resulted from the decreased light availability, due to increased depth, while the nutrient concentrations have been high enough to support phytoplankton growth.

• 한국산학기술학회논문지
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• 제22권1호
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• pp.188-196
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• 2021

우리나라는 국가하천 관련 사업들에 많은 투자를 하고 있으나 하천사업이 완료된 후 사업의 실효성을 평가할 수 있는 평가기법이나 하천사업을 관리할 수 있는 시스템은 부재한 실정이다. 평가기법과 시스템의 부재로 하천공사구간 정보, 사업효과 분석, 사업 간 벤치마킹 등의 불가로 이어진다. 이는 동일 구간 유사사업 수행으로 인한 예산의 과잉, 중복투자 문제를 야기할 수 있으며 잘못된 사업요소가 반복적으로 활용될 수 있다. 이러한 평가기법 및 시스템의 부재를 해결하고자 본 연구에서는 하천사업 평가기법 개발 및 하천사업(공사)관리시스템 개발을 진행하였다. 평가기법의 개발은 사업 간의 비교·분석을 가능하게 하며, 유지관리 계획 수립 시 활용될 수 있다. 또한 시스템을 통해 공사정보 조회 및 공사구간의 시각화, 성과품 관리 등을 제공할 수 있다. 본 연구에서는 선행연구를 통해 개발한 하천사업 평가기법을 수정·보완하였으며, 낙동강수계 국가하천인 A하천 ◯◯지구, B하천 △△지구 하천환경정비사업에 적용을 통해 실효성을 검증하였다. 또한 하천사업(공사)의 공정관리, 예산관리 등을 위한 시스템 구성(안)을 제시하였다. 본 연구에서 제시한 평가기법 및 시스템 활용방안을 통해 하천사업의 업무효율성 증대와 하천사업의 효율성을 제고할 수 있을 것으로 기대한다.

• 한국경제지리학회지
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• 제16권2호
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• pp.247-261
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• 2013

'영산강살리기사업'은 하천의 원래 모습을 되살리고 새로운 수변공간을 조성하는 사업이다. 4대강살리기사업의 일환인 이 사업은 2009년 시작되었다. 2011년 10월 승촌보와 죽산보가 완공되었고, 하천양안에는 자전거 도로를 비롯하여 70개소의 수변공원이 조성되었다. 이 연구의 목적은 영산강살리기사업으로 조성된 수변공간과 자전거 도로를 이용하는 방문객의 이용행태와 만족도, 영산강살리기사업에 대한 평가 등을 분석하는 것이다. 방문객들은 산책, 자전거 타기 등과 관련한 여가 레저 활동을 목적으로 수변공간을 주로 이용하였고, 수변공간과 자전거 도로에 대한 만족도는 비교적 높았다. 영산강살리기사업에 대한 평가도 긍정적이었다. 그렇지만 수변공간 내의 편의시설 부족과 안내시설 개선이 주요 문제점으로 도출되었다.

• 농업생명과학연구
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• 제52권6호
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• pp.89-101
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• 2018

본 연구는 4대강 사업에 따른 낙동강 수질의 변동성을 평가하기 위한 것으로, 낙동강에 건설된 8개보 건설 전후의 수질을 비교, 분석하였다. 이를 위해 보에서 가장 인접한 상류 수질측정지점을 대상으로 4대강 사업전(2003년 1월부터 2008년 11월), 사업중(2008년 9월부터 2012년 4월), 사업후(2012년 5월부터 2017년 9월)까지의 3개 기간에 대해 DO, BOD, COD, SS, T-N, T-P, TOC 등의 수질자료를 수집하였다. 4대강 사업전후 자료의 유의성 검증을 위해 대응검정 T-test를 95%의 신뢰구간에서 실시한 결과 DO, BOD, COD, T-N, TOC는 사업 전보다 사업 후 수질 농도가 높아지는 경향이 있으며, 그 중 BOD, COD, TOC의 농도가 큰 차이를 보였다. 반면에 SS, T-P는 사업 전보다 사업 후 농도값이 감소하였다. 수질인자 중 변화값이 큰 BOD, COD, TOC를 수질등급으로 나누어 공간적으로 분석해 본 결과 사업전에 비해 사업후의 수질등급이 나빠지는 경향을 보였다.

• 한국조경학회지
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• 제35권5호
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• pp.16-28
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• 2007

In this study, the implications for landscape architecture in the restoration Project of Cheonggyecheon will be shown through the analysis of factors for landscape architect scheme modification. The method of study consists of theoretical study, analysis of the plan and design of landscape architecture of the restoration project of Cheonggyecheon, and deduction of implications thereof. The controversial feints included the many difficulties in realizing the productive design of landscape architecture due to the selective collecting of public opinion and the problems of settling the complications, the design limit of the turnkey and MA systems, the lack of hydraulic knowledge and technology and the shortage of vegetation monitoring data and experimental materials. The alternative proposals are as follows: 1) there should be agreement between the government organization and the civil group, 2) in the turnkey bidding for the river restoration projects, the river restoration design based on the volume divided into some parts should be reconsidered in order to maintain consistency in the total design, 3) in order to maintain consistency in the planning policies, MA designs should also be introduced and applied from the first stage of the project through its completion, and 4) data such as the safe water level in case of flooding for the facilities and the vegetation and data in connection with the ecological restoration of river should be accumulated. If these controversies are not settled effectively, the river restoration project will be delayed due to complications with the citizens and wasted time and effort will result from the frequent design changes. In addition, landscape architecture in this kind of restoration project is bound to decrease in the future due to frequent changes in the hydraulic-centered design.

• 한국농공학회논문집
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• 제61권5호
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• pp.33-47
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• 2019

The environmental ecological flow (EEF) of stream or river will be designated according to the enforcement of the Water Environment Preservation Act. Previous researches by Ministry of Environment have proposed agricultural reservoirs as alternative resources to secure river flow where multi-purpose dam does not exist. However, agricultural reservoirs are constructed for the supply of agricultural water, and in fact, there is not a sufficient amount of water to be supplied to rivers as EEF. Therefore, this study examines the economic feasibility of securing EEF through the remodeling or construction of agricultural reservoirs. We investigated water balance of reservoir through simulation of three types of water supply demands such as agricultural water, agricultural water and river maintenance flow, and agricultural water and environmental ecology flow. The economics analysis was conducted on water supply demands and corresponding remodeling or construction of reservoirs. As a result, it was found that the method of securing through heightening existing reservoir enhancement is economically feasible. However, it was not possible to secure all the amount of the EEF due to the size limitation of existing reservoirs or constrain of the watershed for newly built reservoir. Therefore, in order to secure all of the EEF, the utilization of other alternatives as well as agricultural reservoirs should be considered. This study demonstrated the method of economical feasibility study of securing river maintenace flow and EEF using agricultural reservoirs and other considerations.

• 수산경영론집
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• 제51권4호
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• pp.1-18
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• 2020

The paper aims to explore existence and degree of remaining fisheries damages after the completion of undertaking the Four Major Rivers Project focusing on the case of Yeongsan river. The paper seeks to show the necessity of consideration of periods of fishery resources recovery in the estimation of ex-post fisheries damages of the project by inferring the analysis of the annual variation of environmental indicators in the river. Therefore, the paper suggests three years of remaining periods of fisheries damages of the project utilizing the variation trend of ex-ante and ex-post annual output data of inland fisheries in Jeonnam province and individual catch of fisheries. In the measurement of the annual degree of fisheries damages during periods of fishery resources recovery, the paper attempts to suggest the method of comparision of day catch data per vessel between ex-ante and ex-post periods of the project, which were investigated by the same institute. Here the paper tries to make correction of ex-post catch data for holding the same catching condition as ex-ante situation by adopting the concept of competitive intensity of catching which was derived from the decreasing rate of number of fishing households in the area of Yeongsan river.

• 한국지형학회지
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• 제27권2호
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• pp.29-46
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• 2020

In this study, changes in the fluvial landforms of the Yeoju section of the Han River, which was made up of the Han River Restoration Project, were examined through existing previous research data, government's environmental impact assessment data, satellite images, and field observations. For example, In the vicinity of Dori Island, the most upstream part of the study section, the location of the confluence of the Han River and Cheongmi Stream was changed, and it was found that a significant portion of the sand sedimentary layer disappeared. In the Bawuinupgubi area, the wetland, which is the first class in the ecological nature, was greatly modified, and the elevation of the ground rose as Gangcheon island and it was completely separated from the river by dredging The confluence of Geumdangcheon and the point bar of Yeonyang-ri in the south were also dredged, turned into an artificial waterfront park, and a chute channel remained in the form of a wetland was also developed as a recreational park. The deposional forms around Baekseok-ri islands also disappeared as dredging was carried out. Among the areas adjacent to the confluence of Bokcheon and Yangchon-ri Island, some sedimentay forms remains, but the abandonned channel between Yangchon-ri and the northern river bank has been changed into a riverside reservoir through dredging and embankment construction, and the waterway of the tributary river(Yazoo) has been greatly changed.

• 생태와환경
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• 제48권3호
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• pp.188-194
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• 2015

River channel dredging and riparian development have been influenced morphology and quantity of natural river habitat. We compared distribution of riverside land and alluvial island in the Nakdong River with field survey and remote sensing analysis after the 4 Large River Project in South Korea. We digitized geomorphological elements, includes main channel, riverside land, and alluvial island by using georeferenced aerial photos taken in pre-dredging (2008) and post-dredging (2012) periods. Field survey was followed in 2012 for a ground truth of digitized boundaries and identification of newly constructed wetland types such as pond, channel, branch, and riverine type. We found that during the dredging period, riverside land and alluvial island were lost by 20.2% and 72.7%, respectively. Modification rate of riverside land was higher in the section of river kilometer 50~90, 140~180, and 210~270. Alluvial island had higher change rate in the section of river kilometer 50~70, 190~210, and 270~310. Average change rate for the riverside land and alluvial island was $-1.02{\pm}0.14km^2{\cdot}10km^{-1}$ and $-0.05{\pm}0.05km^2{\cdot}10km^{-1}$, respectively. Channel shaped wetlands (72.5%) constituted large portion of newly constructed wetlands.