• Title, Summary, Keyword: Fishway

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Fish Passage Evaluations in the Fishway Constructed on Seungchon Weir (승촌보에 설치된 어도에서 어류의 이동성 평가)

  • Choi, Ji-Woong;Park, Chan-Seo;Lim, Byung Jin;Park, Jong-Hwan;An, Kwang-Guk
    • Journal of Environmental Science International
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    • v.22 no.2
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    • pp.215-223
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    • 2013
  • The objective of this study was to evaluate fish passage efficiency, based on fish-trap monitoring methodology, in the fishway of Seungchon Weir, which was constructed on the lower region of Yeongsan River in 2011. Seasonal patterns and diel variations of fish movements, fish fauna, and compositions in the fishway were analyzed in relation to the current velocity and location of the trap-setting in the fishway. For the analysis, we conducted seven times surveys in 2012 on the fishway and also conducted intensive monitoring of the fishway as 3 hrs interval for the diel variations of fish fauna and compositions in the fishway. According to the fish-trap monitoring methodology, the total number of fish species was 13 species, which was a 43.3% of the total. Most dominant fish used the fishway was Squalidus chankaensis tsuchigae and the relative abundance of the species used the fishway was 33.5% of the total. The season and time zone (in diel variation) observed most frequently in the fishway were July and 18:00-21:00 PM, respectively. The fish movements and use-rates of fishway varied depending on the locations of trap-setting; Fish biomass and the number of species were statistically (p < 0.05) greater in the most right or left-sided traps than in the mid-traps. Also, fish movements and use-rates of fishway were influenced by current velocity on the fishway; fish in the fishway preferred the low current velocity (mean 0.71 m/sec) than the high current velocity (mean 1.13 m/sec). Further long-term studies should be monitored for the efficiency evaluations of the fishway.

Development of Fishway Assessment Model based on the Fishway Structure, Hydrology and Biological Characteristics in Lotic Ecosystem

  • Choi, Ji-Woong;Park, Chan-Seo;An, Kwang-Guk
    • Journal of Ecology and Environment
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    • v.39 no.1
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    • pp.71-80
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    • 2016
  • The main goal of this study is to develop a multi-metric fishway assessment model (Mm-FA) and evaluate the efficiency of fishway. The Mm-FA model has three major fishway components with nine metrics: structural characteristics, hydraulic/hydrologic features, and biological attributes. The model was developed for diagnosing and assessing fishway efficiency and tested to Juksan Weir at the Yeongsan River Watershed. Structural characteristics of fishway included slope of the fishway (M1), ratios of fishway width to stream width (M2), and the proportion of orifice clogging and orifice size (M3). Hydraulic/hydrologic characteristics included depth of fishway entrance head (M4), depth of exit tail (M5), and current velocity of inner fishway (M6). Biological characteristics included fish species ratio of inner fishway to upper-lower weir (M7), fish length distribution (M8), and the proportion of migratory fish species to the total number of species (M9). Overall, the assessment of fishway efficiency showed the total score of the Mm-FA model was 25 in the Juksan Weir, indicating "good condition" by the criteria of the five-level classification system. The Mm-FA model may be used as a key tool for the assessment of fishway efficiency, especially on the 16 weirs constructed for the "Four Rivers Restoration Project" after a partial calibration of Mm-FA model.

Improvement Plan and Conditions for Operation of Fishways Installed at Sluice Gates in Domestic Dikes (국내 배수갑문에 설치된 어도의 운영실태 및 개선 방향)

  • Kim, Jae-Ok
    • KCID journal
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    • v.18 no.1
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    • pp.44-57
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    • 2011
  • The status of fishway installed in domestic dikes showed a cascade types and sluice gate types 36% (four sites) and 64% (seven sites), respectively. Fishway of cascade type was constructed four sites (Iweon, Busa, Geum river, Haenam) and only Geum river was one of them has operated much more effectively since remodeling in a fishway and fishways of the others was not operated because of several problems like a desalination, a shortage of inflow water and variation of management elevation. Fishway of sluice gate type was installed seven sites and three sites (Yeongsan, Yeongam, Geumho) one of them were continuously operated until now. This results has a interesting interpretations. Prolonged discharge of inductive water from fishway can positively affect not only ascending of fishes but also fish fauna of around of the sea. The others of a sluice gate fishway were not operated because of seawater circulation through sluice gate until now. The closed reasons of fishway in domestic dikes may be summarized as follows: impassibility of sluice gate open by shortage of inflow water, problem of proper operating by long distance of between fishway and management office, absence of operating manual, seawater circulation, lack of fishway operating awareness. It was takes a long time for solution of hardware part but software part can be to find the answer through making a fishway operation manual and development of education program for manager. In this paper we deal with fishway in domestic dikes. Proper fishway control by manager was essential for ascending of migration fishes especially at fishway installed in dikes. Thus it was necessary to make manual for fishway operation and effort of continuously maintenance.

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A Study on the Efficiency Improvement of Existing Pool-and-Weir Type Fishway in Namgang Weir (남강수중보의 기존 전면월류형 계단식 어도의 효율성 개선에 관한 연구)

  • Lee, Hyeong-Rae;Kim, Ki Heung;Park, Ho Chul
    • Journal of the Korean Society of Environmental Restoration Technology
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    • v.17 no.2
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    • pp.61-71
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    • 2014
  • A river fishway is a hydraulic structure enabling fish to overcome stream obstructions such as dams and weirs. The main aim of this paper is to investigate the collectibility of upstream-migrating fishes and hydraulic problems in pool-and-weir type fishway which has been established for upstream-migration at Namgang weir in the downstream of Namgang dam, and to grope for improvement measures which pool-and-weir type fishway can be switched to pool-and-partial weir type fishway through hydraulic field experiment. Exsisting fishway had problems which upstream-migrating fishes can not take a rest due to the seiche and vortex phenomena in pools and migrate to upstream because of height difference in entrance pool. In order to prevent hydraulically the seiche and vortex phenomena and establish rest area for fishes in each pool, we carried out hydraulic field experiments. In the fishway, it was to improve pool-and-weir into pool-and-partil weir, to decrease the height difference in entrance pool, and to reduce oriffice velocity of each pool. Also, we investigated fishes collectibility of after improving fishway for 6 days in September 2013. To resolve chronic problems(seiche-vortex phenomena and rest area for fishes), as weirs were remodeled into partial weir only which central part of weirs was part of non-overflow weir, we confirmed results that pool-and-weir type fishway could be switched to efficient pool-and-partial weir type fishway with relatively simple construction and low cost. Type-B which has the closed oriffices and the parts of non-overflow has the ideal conditions, but this conditions are limited to fishway of Namgang weir used in this study. Representative Ice-habor type fishway is pool-and-partial weir type fishway which has together parts of overflow and oriffices, and has excellent ability of upstream-migration. To switch from pool-and-weir type fishway to pool-and-partial weir type fishway, the size of oriffice has to be regulated by the discharge of fishway and the dimension on parts of non-overflow and overflow in weirs. Entrance pool is important facility which upstream-migrating fishes have to not only be collect but also charge with energy. In this study, entrance-pool is temporary and roughly-built, but fishes gather together more than the case of no entrance-pool. In the case of fishway which was protruded to downstream, as entrance of fishway turns toward or parallels to weir, the collectibility of fishway was excellent by attraction water.

Estimation of Maintenance Flow for Suitable Utilization of Fishway (어도의 적절한 이용을 위한 유지유량 평가)

  • Kim, Seok-gyu;Kim, Chul;Kim, Seonghwan;Ko, Kwangyong
    • Journal of Korean Society on Water Environment
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    • v.25 no.2
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    • pp.281-287
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    • 2009
  • Achieved monitoring regularly about fishway that is a intake dam belongings to Kyeongchon for 5 years. Result that achieve monitoring, discovered pressing issue of opening and closing degree of discharge control part in fishway. In this research, analyze discharge relation with fishway and intake sluice and presented operation plan of opening and closing of discharge control part. Investigated necessity intake discharge and benefited area to analyze relation of discharge that is flowed in fishway and discharge escaping by intake sluice. When opened discharge control part step by step gradually, analyzed discharge. Compared with survey discharge making ration curve of fishway and intake sluice using orifice and submerged weir formula. Because operation of intake dam is necessary intake discharge and upriver inflow discharge by time, operation uses by survey discharge and calculated opening discharge of fishway by opening discharge of intake sluice via monthly inflow discharge. To sum up, calculated floodgate opening height of fishway by water level to present maintenance standard of intake dam.

NUMERICAL ANALYSIS OF THE HYDRAULIC CHARACTERISTICS OF ICE-HARBOR TYPE FISHWAY (아이스하버식 어도 내 수리특성에 관한 수치해석연구)

  • Ko, S.H.;Choi, H.K.;Lee, H.B.;Rhee, S.H.
    • 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 $2{\times}10^5{\sim}3{\times}10^5$.

An Assessment of Ascending Functions of the Pool-and-Weir Fishway at Jamsil Weir in the Han River (한강 잠실수중보 계단식 어도의 어류소상기능 평가)

  • Park, Sang-Deog;Shin, Sung-Sook;Ahn, Hyo-Yoon;Ma, Soo-Bong;Hwang, Chong-Seo
    • Journal of Korea Water Resources Association
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    • v.37 no.7
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    • pp.541-552
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    • 2004
  • In this paper, ascending functions of the pool-and-weir fishway which has been established for the upstream migration of migratory fish at Jamsil Weir in the lower part of the Han River was assessed by applying tile Existing Fishway Measurement Method, and measures to improve these functions were suggested. The primary fish which ascended the fishway during the period of measurement was Erythroculter erythropterus Basilewsky, greater than 29cm in the body length. A total of 361 individual fish were collected with traps established at the exit of the fishway The maximum ascending capacity for the fish was 2.53${\times}$10^{-3}$ fish/hr/g. The fishway of Jamsil Weir does not satisfy the various fish species inhabiting in the river. Especially, small fishes of lower swimming ability may not ascend the fishway because the difference in water levels between upper and lower pools in the fishway was too large at the exit and there was too much discharge flowing into the fishway. This fishway does not have a roll in the ascending function for other species except Erythroculter erythropterus Basilewsky and Hemibarbus labeo Pallas, for which swimming ability is great. In order to improve the ascending function of the fishway, the structures of the fishway need to be changed so that various species in the river can easily ascend and the fishway function be taken into consideration in operation of the gates of the weir. Additional construction of fishways on both sides of the lower flow channel are needed to correct a decline in the fishway effectiveness due to continuous flow over the fixed part of the weir.

Hydraulic Model Experiment for Field Application of Iceharbor-type Precast Fishway (조립식 아이스하버식 어도의 현장 적용을 위한 수리모형실험)

  • Kim, Jae-Ok;Park, Sang-Hyun;Cho, Jae-Won;Hwang , Jong-Seo;Jo , Guk-Hyun;Joh , Seong-Ju
    • Journal of The Korean Society of Agricultural Engineers
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    • v.46 no.2
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    • pp.3-14
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    • 2004
  • This study was conducted to assess the possibility of the field application of the iceharbor-type precast fishway. When overflow depth of weir is 4.0 cm in model fishway, upper part velocities appear appropriate for upstream migration of fish and the lowest overflow wall (right line) in lower part has shown velocity distribution more or less inadequate for upstream migration. Except that right line, left and middle line revealed that velocities are appropriate for upstream migration of fish. Therefore, we concluded that this fishway owing to be not broad growth width of overflow velocities according to increasing discharges can correspond to variation of water level. Also We consider that various velocities in fishway were effective, because slow velocity line can guide flow for upstream migration. For low flow, the arrangement of different crest level or each overflow part (higher left, middle and lower right, or lower left, middle and higher right) was more effactive than unform crert level. Hole plays an important role as migration pass during drought and flood flow. Therefore, We concluded that this fishway can cope with water depth variation by various overflow wall height change and raise the field applicability with better performance hydraulically and structurally.

Fish Passage Assessments in the Fishway of Juksan Weir Constructed in the Downstream Area of Youngsan-River Watershed (영산강수계의 죽산보에 설치된 어도에서 어류의 이동성 평가)

  • Park, Chan-Seo;An, Kwang-Guk
    • Journal of Environmental Science International
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    • v.23 no.8
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    • pp.1513-1522
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    • 2014
  • Fish passage asssessments were conducted in the fishway at Juksan Weir, which was constructed as a four-major rivers project in the downstream area of Youngsan-River Watershed. For the research, fish-movements/migrations were analyzed for seven times from April ~ October, 2013 using an approach of fish trap-setting. Fish fauna and compositions were analyzed in the fishway, and seasonal- and diel-movement patterns were analyzed in relation to current velocity in the fishway. Also, abundances of exotic fishes such as bluegill sunfish (Lepomis macrochirus), large-mouth bass (Micropterus salmoides), and white curcian carp (Carassius cuvieri) were monitored in the fishway. Current velocity(n = 18) in the fishway showed large variations ($0.82{\pm}0.63m/s$) depending on the location of the fish trap-setting and this physical factor influenced the fish movements. Fish movements, based on the CPUE of individuals, in the fishway was greater in slower velocity (mean: 0.36 m/s, range: 0.10~1.54 m/s) than faster velocity (mean: 1.51 m/s, range: 0.90~1.90 m/s). Seasonal analysis of fish movements showed that most frequent uses (8 speices and 591 individuals, 66.2% of the total) of the fishway occurred in spring period(i.e., June). Diel movement analysis, in the mean time, showed highest in the time period of 00:00 ~ 3:00 am (7 species and 281 individuals, 20.9% of the total). The efficient managements in the fishway at Juksan Weir are required in relation to the hydrological regime.

Study on Design Standards for Nature-like Fishway in Korea (국내 자연형 어도 설계 기준 마련을 위한 고찰 - 자연형 어도 표준 모형안의 문제점과 개선방안을 중심으로 -)

  • Hwang, Sung-Won;Kim, Jin-Oh
    • Journal of Environmental Impact Assessment
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    • v.26 no.3
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    • pp.181-194
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    • 2017
  • While over 90 percent of fishways are made up with concrete material, nature-like fishways are started to be established as a form of small stream using natural materials. Recently, the central government in collaboration with a university has proposed a 'Standard Model of Nature-like Fishway' with a purpose to provide as a national design standard of nature-like fishway. This study aims to criticize the proposed design model of nature-like fishway and to propose improvements by examining other international cases. As a result, we found problems and limitations of the proposed design model due to the lack of research and experience about making nature-like fishway in Korea. Especially, for designing bypass nature-like fishway we found the lack of studies about structure management strategies, establishment of rocks or pebbles inside the stream, and natural materials. In this sense, more studies about nature-like fishway design adaptable to our environment need to be conducted. In addition, since the proposed design standard for nature-like fishway has been created based on the limited examination of existing domestic cases, it is desirable to improve the design standard on the basis of hydrological and biological research so that they could be adapted effectively to regional and local contexts.