• Journal of Industrial Technology
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• v.26 no.B
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• pp.63-71
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• 2006

The concerned object of the construction industry is environment. It is one of the main purposes of today's construction that human can live reasonably in nature. This study is about the fish-road connecting hydraulic structure in the river with nature. Chapter 2, starting with the general investigation about fish-road and helps comprehension for relatively general fish-road such as necessity, establishment purpose, history, study example, relating domestic law, design condition, consideration and form of fish-road. Chapter 3, containing the present condition of fish-road facilities in Gangwon-Do and thoughts of the problems and general countermeasures of existing fish-road. Chapter 4, Having Examined compatibility by amount of flowing water through hydraulic model test in the Ice harbor I-type model. chapter 5, Analyzation and arrangement to efficient establishment plan of fish-road and the result of the hydraulic model experiment to be beaconed a little in forward fish-road study. In the hydraulic model test result, when we suppose establishment of 1~3 in slope of 1/20, could know that applicable drought flow of the river is $0.06{\sim}3.0m^3/sec$ in case of Ice harbor I-type which transforming Ice harbor that was invented as studying project of the Ministry of Environment.

• Proceeding of EDISON Challenge
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• 2015.03a
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• pp.618-622
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• 2015

어도(fishway)란 강이 댐과 같은 인공물로 막혀있을 때 물고기가 지나갈 수 있도록 만든 통로이다. 본 연구에서는 전산유체해석 프로그램인 EDISON_CFD 시스템을 활용하여 아이스하버식 어도 내 월류부(rollway)에서 유체의 수직흐름특성을 분석하였다. 어류는 소상과 강하시 어도 내의 흐름에 민감하므로, 흐름에 영향을 주는 요인을 분석하는 것은 중요한 문제이다 어도는 2차원으로 간략화하여 모델링하였으며, 강의 유속, 어도의 기울기, 월류부 높이를 변화시키며 이들이 어도 내의 흐름특성과 어떤 관계가 있는지 분석하였다. 또 속도 증가에 따른 수면파의 파장 변화를 프로우드수와 연관지어 설명하였고, 레이놀즈수가 어도 내의 흐름특성과 밀접한 관련이 있음을 확인하였으며 기 설치된 어도의 문제점을 보완할 수 있는 방법을 제시하였다.

• Proceedings of the Korean Society of Agricultural Engineers Conference
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• 2003.10a
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• pp.635-638
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• 2003

This study was studied in Tamjin liver that is situated jangheung-gun Jeollanm-do. Fishways that was studied with the emphasis on Ice harbour type fishway analyzed efficiencies. In result, Ice harbor type fishway discovered 12species of fish among 13species in Tamjin liver. But, most other fishways have discovered a few fishes. Because most fishways established ill station and managed badly.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.33 no.5
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• pp.1841-1850
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• 2013

The various types of fishways are installed at the multi-functional weirs in the four major rivers to minimize the negative effect due to the construction of the transverse structures. The movable weir was installed at the upstream of the ice-harbor type artificial fishway of the Dalseong weir in the Nakdong river, which can control the fishway flowrate regardless of the river flowrate. The incoming flowrate to the artificial fishway is closely related with the hydraulic characteristics that dominate the fish passage efficiency. Thus, it is crucial to find out the weir operation rule for properly sustaining efficient fish-passage, such as the optimized flowrate. In this study, the FLOW-3D was used to analyze and compare the various hydraulic characteristics associated with the passage efficiency, based upon the given different flowrate, and subsequently provide the optimized flowrate for the fishway movable weir to maintain the best efficient flow condition for the fish-passage.

• Korean Journal of Environmental Biology
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• v.33 no.1
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• pp.75-82
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• 2015

To overcome the stream fragmentation and blockage of migration of fishes by dams and weirs, fishways are commonly installed. However, limited studies were conducted for effectiveness and suitability of fishways installed in Korean streams. In this study, we investigated fish usages (by time periods, locations and months) of the Ice Harbor type fishway installed in the Gongju weir using traps. The monitoring were monthly conducted from June to October, 2012. The number of individuals which used fishway in September and October decreased than in June to August. Although no statistical significance was identified, many numbers of species and individuals were occurred at the trap installed at the left end of fishway than others. Fishes of more diverse size classes occurred at this trap as well. The number of collected individuals and water level of weir were positively correlated though they showed low correlation coefficient. Conversely, occurrence rate of fishes smaller than 70 mm of total length decreased with increasing water level of weir. fishway usage time of fish were different depends on ecological characteristics of each species. Various sizes of fishes can use fishway for their upstream migration. These results are useful for establishing management and evaluation plans of Ice Harbor type fishway in S. Korea.

• Journal of Korea Water Resources Association
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• v.55 no.1
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• pp.33-42
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• 2022

In this study, flow patterns in the ice-harbor fishway were analyzed according to fluctuations of the upstream water level, an increase of weir interval, and the presence or absence of orifices using a three-dimensional commercial numerical model, Flow-3D. In order to prove the suitability of the numerical simulation results, the flow velocity and flow rate at the exit of the fishway were observed using a 3D ultrasonic velocimetry on an actual ice-harbor fishway installed downstream of the Daegok bridge in Gyeongan-Cheon. Four types of turbulence modules can be selected for the Flow-3D model. As a result of verification with observation data, the RNG model best described the flow characteristics in the ice-harbor fishway. The velocity structure in the fishway according to fluctuations of the upstream water level was simulated. The results showed that the plunging flow and the streaming flow were mixed at the lowest water level. When the water level increased about 10 cm or more from the lowest water level, the plunging flow disappeared in all pools and only the streaming flow occurred. Contrary to expectations, even when the water level is rose a little, the flow simply occurred mainly on the streaming flow. If the interval between the weirs is increased, both the plunging flow and the streaming flow are showed continued even if the water level rises. In addition, compared to the case where there are no orifices at the bottom of the weirs, the plunging flow tends to be generated in several pools. It is necessary to prevent blocking orifices through active management so that various flow patterns in the fishway can be generated in multiple pools.

• Journal of computational fluids engineering
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• v.20 no.3
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• pp.15-19
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• 2015

A fishway is a structure on or around artificial and natural barriers, such as dams, locks and waterfalls, to help fishes' natural migration. In this paper, a computational fluid dynamics (CFD) code, termed SNUFOAM is used to analyze vertical hydraulic characteristic of rollway of fishway. Volume-of-fluid (VOF) method was used to handle free-surface. It is important to determine the factors influencing flow characteristics in fishway because fish use directional information from the flow characteristics to navigate through fishway. Fishway was modeled in 2-D and the influence of the stream velocity, slope, and weir height of fishway was tested. In results, the transition Reynolds number was $2{\times}10^5{\sim}3{\times}10^5$.

• Journal of the Korean Society of Environmental Restoration Technology
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• v.19 no.4
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• pp.61-79
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• 2016

This study aims at examining the structural and managemental problems of the existing fishways which affect the migrations of fishes, and at suggesting alternatives to improve the fishways' efficiency. The study focuses on the fishways constructed in the diversion weirs in the lower reaches of 41 rivers(2 national rivers and 39 rural rivers) in the eastern coast of Korea. Most of water-using facilities in Korean rivers are diversion weirs, and fishways are established as subsidiary facilities of most of the weirs. Among the 58 or so fishways examined in this study, only a few are doing their proper function, and most of them need improvement. This study aims at strengthening those fishways function and increasing their economic efficiency and migration efficiency. Based on the results of this study, the followings are suggested. In case the fishway sticks out downstream from the apron, a subsidiary fishway diverging from the main is suggested to attract fish. The entrance to the subsidiary should head below the raised part of the apron and a pool should be constructed in the connecting part with the main. To attract fish and let the upstream migrators rest for a while, an entrance pool should be constructed in the fishway. Most of the examined fishways have low side walls, which allow the upstreamers to jump out of the fishway. Those side walls are suggested to be raised above the jumping height of target fishes. The exit parts of most fishways are too shallow, or have no grass to protect the fish from the birds. Protective facilities are suggested to keep the birds from entering the fishway. By the time Ice-harbor type and Vertical-slot type fishways are scientifically proved to be defective, the fishway should not diverge from the standard design.

• Proceedings of the Korea Concrete Institute Conference
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• 1999.10a
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• pp.333-336
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• 1999

The crack of concrete induced by the heat of hydration is a serious problem, particularly in concrete structures such as mat-slab of nuclear reactor buildings, dams or large footings, foundations of high rise buildings, etc.. As a result of the temperature rise and restriction condition of foundation, the thermal stress which may induce the cracks can occur. Therefore the various techniques of the thermal stress control in massive concrete have been widely used. One of them is prediction of the thermal stress, besides low-heat cement which mitigates the temperature rise, pre-cooling which lowers the initial temperature of fresh concrete with ice flake, pipe cooling which cools the temperature of concrete with flowing water, design change which considers steel bar reinforcement, operation control and so on. The Aim of this paper is to verify the effect of low heat blended cement in reducing thermal stress in slab type's mass concrete such as container harbor structures.

• Proceedings of the Korea Water Resources Association Conference
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• 2007.05a
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• pp.1023-1027
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• 2007

건설 사업에 부쩍 관심의 대상이 되어지고 있는 것이 환경이며, 자연 속에 인간이 무리 없이 생활할 수 있도록 하는 것이 주된 목적일 것이다. 본 연구에서는 하천에 축조된 수공구조물을 자연과 연결시켜 주는 어도에 대하여 논하였다. 어도란 하천의 댐이나 보 등의 수리구조물을 설치하게 되면 이 하천을 오르내리며 살던 수생동물들의 원활한 이동이 어려워지므로 이들의 계속적인 이동이 가능토록 만들어진 수리구조물로 어도의 개념 자체가 본격적으로 받아들여진 것은 그 역사가 짧고 개발 중심의 논리에 치중하였던 국내에는 연구자체가 일천한 실정이다. 따라서 본 연구에서는 환경부 연구과제로 개발한 아이스하버식 어도를 변형한 I형 아이스하버식 어도를 모델로 수리모형실험을 통하여 유량에 따른 적합성을 판단하여 어도의 효율적인 설치 방안을 제공하는데 있다. 실험 결과 변형한 I형 아이스하버식 어도의 경우 1/20의 경사에서 $1{\sim}3$련의 설치를 가정할 때 적용 가능한 하천의 갈수량은 $0.06{\sim}3.0m^3/sec$임을 알 수 있었다.