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River research and applications 14건

  1. [해외논문]   Cover Image, Volume 34, Issue 6   SCI SCIE

    Bui, M.T. , Kuzovlev, V.V. , Zhenikov, Y.N. , Fü , reder, L. , Seidel, J. , Schletterer, M.
    River research and applications v.34 no.6 ,pp. i - i , 2018 , 1535-1459 ,

    초록

    The cover image, by Minh Tuan Bui et al., is based on the Research Article Water temperatures in the headwaters of the Volga River: Trend analyses, possible future changes, and implications for a pan‐European perspective , https://doi.org/10.1002/rra.3275 . Acknowledgements: REFCOND_VOLGA project. Photo credit: Martin Schletterer.

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  2. [해외논문]   Issue Information   SCI SCIE


    River research and applications v.34 no.6 ,pp. 493 - 494 , 2018 , 1535-1459 ,

    초록

    No abstract is available for this article.

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

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  3. [해외논문]   Water temperatures in the headwaters of the Volga River: Trend analyses, possible future changes, and implications for a pan‐European perspective   SCI SCIE

    Bui, M.T. (Institute for Modelling Hydraulic and Environment Systems, University of Stuttgart, Stuttgart, Germany) , Kuzovlev, V.V. (Chair of Nature Management and Ecology, Tver State Technical University, Tver, Russia) , Zhenikov, Y.N. (Chair of Nature Management and Ecology, Tver State Technical University, Tver, Russia) , Fü (Institute of Ecology, University of Innsbruck, Innsbruck, Austria) , reder, L. (Institute for Modelling Hydraulic and Environment Systems, University of Stuttgart, Stuttgart, Germany) , Seidel, J. (Institute of Ecology, University of Innsbruck, Innsbruck, Austria) , Schletterer, M.
    River research and applications v.34 no.6 ,pp. 495 - 505 , 2018 , 1535-1459 ,

    초록

    Abstract Water temperature is a physical property influencing abiotic and biotic parameters in an aquatic ecosystem. In different Central European rivers and lakes, a general trend of water temperatures in the range of +0.05 to +0.8 °C per decade was identified. Our case study analyses whether similar patterns apply to the headwaters of the Volga River, in the East European plain. Based on a dataset of water temperatures for 2008–2015, we investigated the spatial and temporal distribution of water temperature along the Tudovka River and estimated backward as well as predicted future changes from development scenarios throughout the 21st century. Stochastic models were applied to track trends and variations in water temperature. Furthermore, the correlation between water temperature and air temperatures was used to model historical water temperatures and to predict possible changes in the future, under the effects of climate change. Based on climate change scenarios, an increase of the mean water temperatures as well as changes regarding the ice cover can be expected until the end of this century. The conditions described for the headwaters of the Volga River system represent a valuable dataset for medium and large rivers in the East European plain and serve as a basis for future management.

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  4. [해외논문]   Effects of air temperature and discharge on Upper Mississippi River summer water temperatures   SCI SCIE

    Gray, B.R. (Upper Midwest Environmental Sciences Center, United States Geological Survey, La Crosse, Wisconsin, USA) , Robertson, D.M. (Upper Midwest Water Science Center, United States Geological Survey, Middleton, Wisconsin, USA) , Rogala, J.T. (Upper Midwest Environmental Sciences Center, United States Geological Survey, La Crosse, Wisconsin, USA)
    River research and applications v.34 no.6 ,pp. 506 - 515 , 2018 , 1535-1459 ,

    초록

    Abstract Recent interest in the potential effects of climate change has prompted studies of air temperature and precipitation associations with water temperatures in rivers and streams. We examined associations between summer surface water temperatures and both air temperature and discharge for 5 reaches of the Upper Mississippi River during 1994–2011. Water–air temperature associations at a given reach approximated 1:1 when estimated under an assumption of reach independence but declined to approximately 1:2 when water temperatures were permitted to covary among reaches and were also adjusted for upstream air temperatures. Estimated water temperature–discharge associations were weak. An apparently novel feature of this study is that of addressing changes in associations between water and air temperatures when both are correlated among reaches.

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  5. [해외논문]   The impact of climate change on the morphology of a tidal freshwater wetland affected by tides, discharge, and wind   SCI SCIE

    Verschelling, E. (Department of Physical Geography, Utrecht University, Utrecht, the Netherlands) , van der Perk, M. (Department of Physical Geography, Utrecht University, Utrecht, the Netherlands) , Middelkoop, H. (Department of Physical Geography, Utrecht University, Utrecht, the Netherlands)
    River research and applications v.34 no.6 ,pp. 516 - 525 , 2018 , 1535-1459 ,

    초록

    Abstract Tidal freshwater wetlands are threatened by climate change, especially by rising sea levels. Until now, research in these wetlands has focused mostly on determining historical and present‐day accretion rates without analysing the influence of climate change on future developments. We study a recently constructed freshwater wetland under influence of tides, wind, and riverine discharges and carry out a scenario analysis to evaluate the impact of climate change on morphodynamics. We use a numerical model that describes the hydrodynamics and morphology in the study area and includes the impact of vegetation and carry out transient scenario runs for the period 2015–2050 with gradually changing boundary conditions. We conclude that the simulated accretion rates are significantly lower than the rate of sea level rise, meaning that the wetland will gradually convert to open water. We also find that the morphological changes can largely be attributed to morphological stabilization of the constructed wetland and not to climate change. Wind plays an important role through resuspension and redistribution of fine sediment, and neglecting it would lead to a significant overestimation of accretion rates on the flats.

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  6. [해외논문]   Fracturing dams, fractured data: Empirical trends and characteristics of existing and removed dams in the United States   SCI SCIE

    Grabowski, Zbigniew J. (Geography Department, Portland State University, Portland, Oregon, USA) , Chang, Heejun (Geography Department, Portland State University, Portland, Oregon, USA) , Granek, Elise F. (Department of Environmental Science and Management, Portland State University, Portland, Oregon, USA)
    River research and applications v.34 no.6 ,pp. 526 - 537 , 2018 , 1535-1459 ,

    초록

    Abstract Dam removals in the United States continue to accelerate in pace and scope, but no national analyses have examined how removed dams compare with existing dam stock. Here, we review and analyse the best available national data on dams from the National Inventory of Dams (NID), dam removals from American Rivers, the U.S. Geological Survey, and the National River Restoration Science Synthesis databases to compare trends and characteristics of removed versus existing dams in the United States. If historical trends continue, by 2050 the United States can expect between 4,000 and 36,000 total removals, including 2,000–10,000 removals of NID dams. Best‐fit regression models estimate total costs between $50.5 million and $ 25.1 billion (mean $10.5 billion, median $ 416.5 million) for all removals and $29.6 million to $ 18.9 billion (mean $7.2 billion, median $ 285 million) for NID removals, a significant cost savings over present stated dam rehabilitation needs. Structural characteristics and ages of documented removals are not representative of existing dams, with privately owned hydroelectric dams subject to public oversight and water supply dams the most disproportionately removed. We conclude that dam removal science would benefit from the creation of an interdisciplinary framework for studying dams as environmental, social, and technological interventions, facilitated by transparent datasets around dams and removals and reflexive research approaches that combine statistical approaches with place‐based analyses.

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  7. [해외논문]   Ecosystem‐based environmental flow assessment in a Greek regulated river with the use of 2D hydrodynamic habitat modelling   SCI SCIE

    Theodoropoulos, C. (Hellenic Centre for Marine Research, Institute of Marine Biological Resources and Inland Waters, Anavyssos, Greece) , Skoulikidis, N. (Hellenic Centre for Marine Research, Institute of Marine Biological Resources and Inland Waters, Anavyssos, Greece) , Rutschmann, P. (Department of Civil, Geo and Environmental Engineering, Technical University of Munich, Munich, Germany) , Stamou, A. (Department of Water Resources and Environmental Engineering, National Technical University of Athens, Athens, Greece)
    River research and applications v.34 no.6 ,pp. 538 - 547 , 2018 , 1535-1459 ,

    초록

    Abstract Despite the long‐term research on the use of hydraulic‐hydrodynamic habitat models (HHMs) for predicting the response of aquatic biota to habitat alteration, their practical application in model‐based environmental flow assessments (EFAs) has been limited due to reasons mainly associated with cost‐effectiveness, time‐efficiency, required expertise, and availability of hydroecological information. In this study, we demonstrate a cost‐effective and time‐efficient application of a benthic‐invertebrate, two‐dimensional, fuzzy rule‐based EFA in a 277‐m long reach in the downstream route of a regulated river in western Greece. Apart from developing ecosystem‐based environmental flow (eflow) scenarios, we highlight the valuable features of HHMs, comment on their disadvantages, and propose working solutions to overcome them. The results of the study show that the hydrology‐based eflow of 0.2 m 3 /s, initially proposed by the managing authorities, is not sufficient to ensure the long‐term functionality of the downstream benthic communities, as the ecosystem‐based eflow ranged between 0.6 and 2 m 3 /s. As social resilience relies heavily on ecological resilience, ecosystem‐based approaches can ensure the sustainability of aquatic ecosystems. This study demonstrates, inter alia, that HHMs‐based EFAs can be implemented cost‐effectively and time‐efficiently to serve as an accurate scientific basis for water managers and stakeholders, in search of the fine balance between anthropogenic water demand and long‐term ecosystem integrity and functionality.

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  8. [해외논문]   River connectivity reestablished: Effects and implications of six weir removals on brown trout smolt migration   SCI SCIE

    Birnie‐ (DTU AQUA, National Institute of Aquatic Resources, Section for Freshwater Fisheries Ecology, Technical University of Denmark, Silkeborg, Denmark) , Gauvin, K. (DTU AQUA, National Institute of Aquatic Resources, Section for Freshwater Fisheries Ecology, Technical University of Denmark, Silkeborg, Denmark) , Candee, M.M. (DTU AQUA, National Institute of Aquatic Resources, Section for Freshwater Fisheries Ecology, Technical University of Denmark, Silkeborg, Denmark) , Baktoft, H. (DTU AQUA, National Institute of Aquatic Resources, Section for Freshwater Fisheries Ecology, Technical University of Denmark, Silkeborg, Denmark) , Larsen, M.H. (DTU AQUA, National Institute of Aquatic Resources, Section for Freshwater Fisheries Ecology, Technical University of Denmark, Silkeborg, Denmark) , Koed, A. (DTU AQUA, National Institute of Aquatic Resources, Section for Freshwater F) , Aarestrup, K.
    River research and applications v.34 no.6 ,pp. 548 - 554 , 2018 , 1535-1459 ,

    초록

    Abstract Today's river systems have been extensively modified, requiring us to rethink how we approach the management of these important ecosystems. We evaluated the effects of removing 6 weirs in River Villestrup (Jutland, Denmark) on the smolt run of brown trout ( Salmo trutta ) over the course of 12 years. During 5 of these years, we evaluated the number, size, and timing of smolts during their downstream migration. We found an increase in smolt output following the weir removals, along with a decrease in average length and indications of an earlier peak migration. Our results suggest that barrier removal has led to an increase in spawning success by adults, fry survival, recruitment, and smolt migration success. Weir removal is therefore a viable management approach to restore connectivity in freshwater streams and rivers, which promotes the passage of smolts as they migrate to marine environments.

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  9. [해외논문]   Acoustically derived habitat associations of sympatric invasive bigheaded carps in a large river ecosystem   SCI SCIE

    MacNamara, R. (Center for Fisheries, Aquaculture, and Aquatic Sciences, Southern Illinois University, Carbondale, Illinois, USA) , Coulter, D. P. (Center for Fisheries, Aquaculture, and Aquatic Sciences, Southern Illinois University, Carbondale, Illinois, USA) , Glover, D. C. (Carterville Fish and Wildlife Conservation Office, U.S. Fish and Wildlife Service, Marion, Illinois, USA) , Lubejko, A. E. (Center for Fisheries, Aquaculture, and Aquatic Sciences, Southern Illinois University, Carbondale, Illinois, USA) , Garvey, J. E. (Center for Fisheries, Aquaculture, and Aquatic Sciences, Southern Illinois University, Carbondale, Illinois, USA)
    River research and applications v.34 no.6 ,pp. 555 - 564 , 2018 , 1535-1459 ,

    초록

    Abstract Bigheaded carp ( Hypophthalmichthys spp.) occur throughout much of the Mississippi Basin, USA. Efforts to control the spread of these invasive species require information on their spatial ecology, though sampling is hindered by their broad extent, habitat tolerances, and species‐specific behaviour. Mobile hydroacoustics was used to quantify habitat and depth use of bigheaded carp over four years in the heavily invaded Lower Illinois River, a major Mississippi tributary and potential dispersal pathway to the Great Lakes. Horizontally oriented transducers (combined with capture gear for species designation) enabled sampling of the main habitat features in this large flood plain river. Silver carp ( Hypophthalmichthys molitrix ) were dominant over bighead carp ( Hypophthalmichthys nobilis ) at all but one site, although habitat use was similar for both species. Densities were highest in lotic backwaters, followed by lentic backwaters and nearshore main channel, with lowest densities in the mid main channel. Bigheaded carp size and species composition were independent of habitat type. Depth associations were similar for both species, with average occurrence at 2.5–3.5 m in the main channel and 1–2 m in backwaters. However, depth relative to the river bed was largely similar across habitat types. Bigheaded carp density and depth use in the main channel were linked non‐linearly to river discharge and water temperature, respectively; densities were reduced during high discharge, whereas depth use became shallower at higher temperatures. Density–hydrology trends were less apparent in backwaters. These findings highlight critical aspects of bigheaded carp spatial ecology that will facilitate effective management in invaded and at‐risk ecosystems.

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  10. [해외논문]   Content of highly unsaturated fatty acids in fish from rivers of contrasting temperature   SCI SCIE

    Sushchik, N.N. (Institute of Biophysics of Federal Research Center “Krasnoyarsk Science Center” of Siberian Branch of Russian Academy of Sciences, Krasnoyarsk, Russia) , Zuev, I.V. (Siberian Federal University, Krasnoyarsk, Russia) , Kalachova, G.S. (Institute of Biophysics of Federal Research Center “Krasnoyarsk Science Center” of Siberian Branch of Russian Academy of Sciences, Krasnoyarsk, Russia) , Ageev, A.V. (Siberian Federal University, Krasnoyarsk, Russia) , Gladyshev, M.I. (Institute of Biophysics of Federal Research Center “Krasnoyarsk Science Center” of Siberian Branch of Russian Academy of Sciences, Krasnoyarsk, Russia)
    River research and applications v.34 no.6 ,pp. 565 - 574 , 2018 , 1535-1459 ,

    초록

    Abstract Contents of highly unsaturated long‐chain fatty acids of omega‐3 family (HUFA); eicosapentaenoic acid (EPA; 20:5n‐3); and docosahexaenoic acid (DHA; 22:6n‐3) are the principal indicators of the nutritive quality of fish for humans. Effects of environmental factors, first of all water temperature, on EPA and DHA contents in fish tissue are not currently completely understood. To reveal the putative effect of water temperature, fatty acid composition and contents were studied for 6 fish species, inhabiting the cold waters of the Yenisei River (Siberia, Russia) downstream of a dam (hypolimnetic release from reservoir) and its adjacent warm water tributaries (the Mana River and the Kacha River). It was hypothesized that (a) fish species from the cold river would have higher HUFA contents than fish from the warm rivers and (b) temperature would be negatively correlated with HUFA content in fish species. Using gas chromatography–mass spectrometry, distinct species‐specific fatty acid profiles were observed, whereas contents of the essential fatty acids, EPA and DHA, in fish species from the cold Yenisei River were in general similar to that from warm tributaries. Thus, in contrast to the first hypothesis, phylogenetic factors overweighed the effect of water temperature and food (benthic invertebrate) composition, on fatty acid composition and HUFA content in fish. For the second hypothesis, for the 2 species inhabiting both cold and warm rivers, only one had higher EPA and DHA content at lower temperatures. Consequently, the response of EPA and DHA content in fish tissue to temperature variations may be species‐specific.

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