Show simple item record

dc.contributor.authorPulg, Ulrich
dc.contributor.authorLennox, Robert
dc.contributor.authorEnqvist, Martin
dc.contributor.authorStranzl, Sebastian Franz
dc.contributor.authorEspedal, Espen Olsen
dc.contributor.authorSchwarz, Michael
dc.contributor.authorLorke, Andreas
dc.contributor.authorFlödl, Peter
dc.contributor.authorHauer, Christoph
dc.contributor.authorSchletterer, Martin
dc.contributor.authorHalleraker, Jo Halvard
dc.contributor.authorVelle, Gaute
dc.date.accessioned2024-09-12T09:14:36Z
dc.date.available2024-09-12T09:14:36Z
dc.date.created2024-08-20T14:09:14Z
dc.date.issued2024
dc.identifier.citationScience of the Total Environment. 2024, 948, 1-14.en_US
dc.identifier.issn0048-9697
dc.identifier.urihttps://hdl.handle.net/11250/3151709
dc.description.abstractHydroelectric power facilities can generate episodic total dissolved gas supersaturation (TDGS), which is harmful to aquatic life. We developed a decision tree-based risk assessment to identify the potential for TDGS at hydropower plants and conducted validation measurements at selected facilities. Applying the risk model to Norway's hydropower plants (n = 1696) identified 473 (28 %) high-risk plants characterized by secondary intakes and Francis or Kaplan turbines, which are prone to generating TDGS when air is entrained. More than half of them discharge directly to rivers (283, 17 % of total). Measurements at 11 high-risk plants showed that 8 of them exhibited biologically relevant TDGS (120 % to 229 %). In Austria and Germany, the analysis of hydropower plants was limited due to significant data constraints. Out of 153 hydropower plants in Austria, 80 % were categorized at moderate risk for TDGS. Two Austrian plants were monitored, revealing instances of TDGS in both (up to 125 %). In Germany, out of 403 hydropower plants, 265 (66 %) fell into the moderate risk, with none in the high-risk category. At a dam in the Rhine River, TDGS up to 118 % were observed. Given the uncertainty due to limited data access and the prevalence of run-of-river plants in Austria and Germany, there remains an unclarified risk of TDGS generation in these countries, especially at spillways of dams and below aerated turbines. The results indicate a previously overlooked potential for the generation of biologically harmful TDGS at hydropower installations. It is recommended to systematically screen for TDGS at hydropower installations through risk assessment, monitoring, and, where needed, the implementation of mitigation measures. This is increasingly critical considering the expanding global initiatives in hydropower and efforts to maintain the ecological status of freshwater ecosystems.en_US
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.rightsNavngivelse 4.0 Internasjonal*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/deed.no*
dc.titleAssessing the potential for gas supersaturation downstream of hydropower plants in Norway, Austria and Germanyen_US
dc.title.alternativeAssessing the potential for gas supersaturation downstream of hydropower plants in Norway, Austria and Germanyen_US
dc.typeJournal articleen_US
dc.typePeer revieweden_US
dc.description.versionpublishedVersionen_US
dc.source.pagenumber1-14en_US
dc.source.volume948en_US
dc.source.journalScience of the Total Environmenten_US
dc.identifier.doi10.1016/j.scitotenv.2024.174645
dc.identifier.cristin2287964
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode2


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record

Navngivelse 4.0 Internasjonal
Except where otherwise noted, this item's license is described as Navngivelse 4.0 Internasjonal