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Title: Injury and mortality of two Mekong River species exposed to turbulent shear forces

Abstract

Global hydropower development is one solution proposed to address the increase in energy needs. However, hydropower-related impacts on riverine ecological systems are not well understood. The Mekong River Basin (MRB) is one of the world’s largest waterways and is presently experiencing significant hydropower expansion. It is also one of the most biodiverse rivers; serving as home to many species that are blocked or hindered by the development of dams. One source of injury and mortality for downstream moving fishes is passage through the turbine environment where fishes may be exposed to several physical stressors (e.g. shear forces, rapid decompression, blade strike and turbulence). The current study sought to understand the susceptibility of blue gourami (Trichopodus trichopterus) and iridescent shark (Pangasianodon hypophthalmus) to shear forces. Fishes were exposed to an underwater jet with velocities up to 21.3 m s–1 (equating to strain rates of up to 1185 s–1) and were assessed for behavioural effects, injuries and mortality. Overall, it was determined that both species were susceptible to the shear forces applied in this study and the effects were more pronounced at higher strain rates. Gouramis were more susceptible than sharks. Furthermore to minimise impacts on these species, shear forces within turbinesmore » should not exceed critical limits.« less

Authors:
 [1];  [1];  [1];  [1];  [2];  [3];  [2];  [4];  [1];  [1];  [5]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  2. National Univ. of Laos, Vientiane (Laos)
  3. Living Aquatic Resources Research Center, Vientiane (Laos)
  4. Charles Sturt Univ., Albury, NSW (Australia)
  5. Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1482215
Report Number(s):
PNNL-SA-132777
Journal ID: ISSN 1323-1650; PII: MF18126
Grant/Contract Number:  
AC05-76RL01830
Resource Type:
Accepted Manuscript
Journal Name:
Marine and Freshwater Research
Additional Journal Information:
Journal Volume: 69; Journal Issue: 12; Journal ID: ISSN 1323-1650
Country of Publication:
United States
Language:
English
Subject:
60 APPLIED LIFE SCIENCES; blue gourami; hydropower; iridescent shark; strain rate

Citation Formats

Colotelo, A. H., Mueller, R. P., Harnish, R. A., Martinez, J. J., Phommavong, T., Phommachanh, K., Thorncraft, G., Baumgartner, L. J., Hubbard, J. M., Rhode, B. M., and Deng, Z. D. Injury and mortality of two Mekong River species exposed to turbulent shear forces. United States: N. p., 2018. Web. doi:10.1071/MF18126.
Colotelo, A. H., Mueller, R. P., Harnish, R. A., Martinez, J. J., Phommavong, T., Phommachanh, K., Thorncraft, G., Baumgartner, L. J., Hubbard, J. M., Rhode, B. M., & Deng, Z. D. Injury and mortality of two Mekong River species exposed to turbulent shear forces. United States. doi:10.1071/MF18126.
Colotelo, A. H., Mueller, R. P., Harnish, R. A., Martinez, J. J., Phommavong, T., Phommachanh, K., Thorncraft, G., Baumgartner, L. J., Hubbard, J. M., Rhode, B. M., and Deng, Z. D. Thu . "Injury and mortality of two Mekong River species exposed to turbulent shear forces". United States. doi:10.1071/MF18126. https://www.osti.gov/servlets/purl/1482215.
@article{osti_1482215,
title = {Injury and mortality of two Mekong River species exposed to turbulent shear forces},
author = {Colotelo, A. H. and Mueller, R. P. and Harnish, R. A. and Martinez, J. J. and Phommavong, T. and Phommachanh, K. and Thorncraft, G. and Baumgartner, L. J. and Hubbard, J. M. and Rhode, B. M. and Deng, Z. D.},
abstractNote = {Global hydropower development is one solution proposed to address the increase in energy needs. However, hydropower-related impacts on riverine ecological systems are not well understood. The Mekong River Basin (MRB) is one of the world’s largest waterways and is presently experiencing significant hydropower expansion. It is also one of the most biodiverse rivers; serving as home to many species that are blocked or hindered by the development of dams. One source of injury and mortality for downstream moving fishes is passage through the turbine environment where fishes may be exposed to several physical stressors (e.g. shear forces, rapid decompression, blade strike and turbulence). The current study sought to understand the susceptibility of blue gourami (Trichopodus trichopterus) and iridescent shark (Pangasianodon hypophthalmus) to shear forces. Fishes were exposed to an underwater jet with velocities up to 21.3 m s–1 (equating to strain rates of up to 1185 s–1) and were assessed for behavioural effects, injuries and mortality. Overall, it was determined that both species were susceptible to the shear forces applied in this study and the effects were more pronounced at higher strain rates. Gouramis were more susceptible than sharks. Furthermore to minimise impacts on these species, shear forces within turbines should not exceed critical limits.},
doi = {10.1071/MF18126},
journal = {Marine and Freshwater Research},
number = 12,
volume = 69,
place = {United States},
year = {2018},
month = {10}
}

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