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- Gómez-Gener, LluísUmeå universitet,Institutionen för ekologi, miljö och geovetenskap (author)
Effect of small water retention structures on diffusive CO2 and CH4 emissions along a highly impounded river
- Article/chapterEnglish2018
Publisher, publication year, extent ...
- 2018-10-03
- Taylor & Francis,2018
- electronicrdacarrier
Numbers
- LIBRIS-ID:oai:DiVA.org:umu-156348
- https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-156348URI
- https://doi.org/10.1080/20442041.2018.1457846DOI
Supplementary language notes
- Language:English
- Summary in:English
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Notes
- The impoundment of running waters through the construction of large dams is recognised as one of the most important factors determining the transport, transformation, and outgassing of carbon (C) in fluvial networks. However, the effects of small and very small water retention structures (SWRS) on the magnitude and spatiotemporal patterns of C emissions are still unknown, even though SWRS are the most common type of water retention structure causing river fragmentation worldwide. Here we evaluated and compared diffusive carbon dioxide (CO2) and methane (CH4) emissions from river sections impounded by SWRS and from their adjacent free-flowing sections along a highly impounded river. Emissions from impounded river sections (mean [SE] = 17.7 [2.8] and 0.67 [0.14] mmol m(-2)d(-1), for CO2 and CH4, respectively) never exceeded those from their adjacent free-flowing river sections (230.6 [49.7] and 2.14 [0.54] mmol m(-2)d(-1)). We attribute this finding to the reduced turbulence in impounded river sections induced by SWRS compared to free-flowing river sections (i.e., physical driver). Likewise, the presence of SWRS favoured an increase of the concentration of CH4 in impounded waters, but this increase was not sufficient to cause a significant influence in the CH4 efflux from the downstream free-flowing river sections. By contrast, this influenced the larger-scale longitudinal patterns of dissolved CH4, which exhibited a dear shifting pattern along the study stretch, modulated by variables associated with the presence of SWRS, such as higher water residence times, higher sedimentation rates, and higher temperatures. Overall, our results show that the presence of SWRS can modify the concentrations of C gases in highly impounded rivers but exerts a minor influence on diffusive C emissions.
Subject headings and genre
- NATURVETENSKAP Geovetenskap och miljövetenskap Oceanografi, hydrologi och vattenresurser hsv//swe
- NATURAL SCIENCES Earth and Related Environmental Sciences Oceanography, Hydrology and Water Resources hsv//eng
- NATURVETENSKAP Geovetenskap och miljövetenskap Miljövetenskap hsv//swe
- NATURAL SCIENCES Earth and Related Environmental Sciences Environmental Sciences hsv//eng
- carbon dioxide
- dam
- discontinuum
- fluvial network
- fragmentation
- greenhouse gas emissions
- poundment
- methane
- regulation
Added entries (persons, corporate bodies, meetings, titles ...)
- Gubau, Marina (author)
- von Schiller, Daniel (author)
- Marce, Rafael (author)
- Obrador, Biel (author)
- Umeå universitetInstitutionen för ekologi, miljö och geovetenskap (creator_code:org_t)
Related titles
- In:Inland Waters: Taylor & Francis8:4, s. 449-4602044-20412044-205X
Internet link
- https://doi.org/10.1080/20442041.2018.1457846Fulltext
- https://umu.diva-portal.org/smash/get/diva2:1287885/FULLTEXT01.pdffulltext:print
- https://www.tandfonline.com/doi/pdf/10.1080/20442041.2018.1457846?needAccess=true
- https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-156348
- https://doi.org/10.1080/20442041.2018.1457846
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