Relating hydraulic conductivity and hyporheic zone biogeochemical processing to conserve and restore river ecosystem services

River management practices commonly attempt to improve habitat and ecological functioning (e.g. biogeochemical processing or retention of pollutants) by restoring hydrological exchange with the hyporheic zone (i.e. hyporheic flow) in an effort to increase mass transfer of solutes (nutrients, carbon...

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Vydáno v:The Science of the total environment Ročník 579; s. 1815 - 1821
Hlavní autoři: Mendoza-Lera, Clara, Datry, Thibault
Médium: Journal Article
Jazyk:angličtina
Vydáno: Netherlands Elsevier B.V 01.02.2017
Elsevier
Témata:
carbon
Denitrification
ecological function
ecological restoration
ecosystem services
Environmental Sciences
habitats
hydraulic conductivity
mass transfer
nitrates
Nutrient uptake
nutrients
oxygen
pollutants
rivers
Sediment augmentation
solutes
Streambed
Denitrification
Sediment augmentation
Streambed
Kf
Nutrient uptake
STREAMBED
KF
SEDIMENT AUGMENTATION
DENITRIFICATION
NUTRIENT UPTAKE
ISSN:0048-9697, 1879-1026, 1879-1026
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Shrnutí:River management practices commonly attempt to improve habitat and ecological functioning (e.g. biogeochemical processing or retention of pollutants) by restoring hydrological exchange with the hyporheic zone (i.e. hyporheic flow) in an effort to increase mass transfer of solutes (nutrients, carbon and electron acceptors such as oxygen or nitrate). However, even when hyporheic flow is increased, often no significant changes in biogeochemical processing are detected. Some of these apparent paradox result from the simplistic assumption that there is a direct relationship between hyporheic flow and biogeochemical processing. We propose an alternative conceptual model that hyporheic flow is non-linearly related with biogeochemical processing. Based on the different solute mass transfer and area available for colonization among hydraulic conductivities, we hypothesize that biogeochemical processing in the hyporheic zone follows a Gaussian function depending on hyporheic hydraulic conductivity. After presenting the conceptual model and its domain of application, we discuss the potential implications, notably for river restoration and further hyporheic research. [Display omitted] •Restoration attempts to increase biogeochemical processing by increasing hyporheic flow.•However, biogeochemical processing does not always increase with hyporheic flow.•Hyporheic flow and biogeochemical processing relationship is likely nonlinear.•Our alternative model: a saturating model as a function of hydraulic conductivity.•This approach may improve the success of hyporheic restoration efforts.
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ISSN:0048-9697
1879-1026
1879-1026
DOI:10.1016/j.scitotenv.2016.11.166