Comparison of Different Techniques to Assess Surface and Subsurface Streambed Colmation with Fine Sediments

Descloux, Stéphane; Datry, Thibault; Philippe, Michel; Marmonier, Pierre

doi:10.1002/iroh.201011250

Cited by 44 publications

(52 citation statements)

References 61 publications

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“…In addition, the variety of sediment management among dams (e.g., timing of flushing operations) may obscure any effect. Extending our study to reaches bypassed by dams or situated just downstream is likely to provide different results (Descloux et al, 2010).…”

Section: Discussionmentioning

confidence: 97%

“…Fine sediment is supplied from scour of the upstream streambed or banks, and from erosion within the catchment (Wood and Armitage, 1997). Worldwide, land clearance, logging, and mining have increased catchment fine sediment supply whilst sediment control, sand mining, and trapping with dams offsets some of these increases (Walling, 2006;Descloux et al, 2010;Datry et al, 2014).…”

Section: Conceptual Model Of Streambed Hydraulic Conductivitymentioning

confidence: 99%

“…This upper Geomorphology 259 (2016) 70-80 limit on reach-average values is an order of magnitude lower than might be expected for a uniform gravel [e.g., the Hazen formula (Hazen, 1892) estimates hydraulic conductivity of 0.04 m/s for particle size diameters of 2 mm]. This is because streambed sediments generally have a broad distribution of particle sizes and because hydraulic conductivity is largely determined by the smaller size fractions (Alyamani and Sen, 1993;Song et al, 2009;Descloux et al, 2010). Consequently, variation in hydraulic conductivity between reaches is likely the result of processes controlling presence of fine sediments in the streambed rather than the coarse fraction.…”

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confidence: 94%

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Variation in reach-scale hydraulic conductivity of streambeds

Stewardson

Datry²,

Lamouroux³

et al. 2016

Geomorphology

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Streambed hydraulic conductivity is an important control on flow within the hyporheic zone, affecting hydrological, ecological, and biogeochemical processes essential to river ecosystem function. Despite many published field measurements, few empirical studies examine the drivers of spatial and temporal variations in streambed hydraulic conductivity. Reach-averaged hydraulic conductivity estimated for 119 surveys in 83 stream reaches across continental France, even of coarse bed streams, are shown to be characteristic of sand and finer sediments. This supports a model where processes leading to the accumulation of finer sediments within streambeds largely control hydraulic conductivity rather than the size of the coarse bed sediment fraction. After describing a conceptual model of relevant processes, we fit an empirical model relating hydraulic conductivity to candidate geomorphic and hydraulic drivers. The fitted model explains 72% of the deviance in hydraulic conductivity (and 30% using an external cross-validation). Reach hydraulic conductivity increases with the amplitude of bedforms within the reach, the bankfull channel width-depth ratio, stream power and upstream catchment erodibility but reduces with time since the last streambed disturbance. The correlation between hydraulic conductivity and time since a streambed mobilisation event is likely a consequence of clogging processes. Streams with a predominantly suspended load and less frequent streambed disturbances are expected to have a lower streambed hydraulic conductivity and reduced hyporheic fluxes. This study suggests a close link between streambed sediment transport dynamics and connectivity between surface water and the hyporheic zone.

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Section: Discussionmentioning

confidence: 97%

Section: Conceptual Model Of Streambed Hydraulic Conductivitymentioning

confidence: 99%

mentioning

confidence: 94%

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Variation in reach-scale hydraulic conductivity of streambeds

Stewardson

Datry²,

Lamouroux³

et al. 2016

Geomorphology

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“…In their clinal model of interstitial communities, Brunke and Gonser () showed that the colonisation of shallow sediment layers by groundwater taxa was restricted by interference competition with surface water taxa. And last, the formation of a coarse, immobile surface layer in the most sediment supply‐limited channels can promote interstitial clogging by reducing bedload movement during floods and hence the remobilisation of fine sediments deposits (Descloux, Datry, Philippe, & Marmonier, ). Clogging may severely increase the resistance of the hyporheic corridor to the movement of interstitial organisms because it reduces the pore space available to organisms as well as the structural connectivity between pores (Datry, Lamouroux, Thivin, Descloux, & Baudoin, ; Descloux, Datry, & Marmonier, ; Nogaro, Datry, Mermillod‐Blondin, Descloux, & Montuelle, ).…”

Section: Discussionmentioning

confidence: 99%

Geomorphic influence on intraspecific genetic differentiation and diversity along hyporheic corridors

et al. 2017

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The hyporheic zone of rivers potentially acts as a dispersal corridor for groundwater organisms because it provides a spatially continuous interstitial habitat between isolated aquifers. Yet, the degree to which it can facilitate the movement of organisms has been hypothesized to vary in response to change in sediment regime, which determines channel morphology. In this study, we used microsatellite markers to test for a relationship between the genetic structure and diversity of the minute interstitial isopod Proasellus walteri and channel morphology along three nearby hyporheic corridors differing widely in their sediment regime. We predicted that genetic diversity would decrease and genetic structuring would increase as sediment supply‐limited channels would become prominent features in the river corridor. The reason is that such channels have fewer and less suitable sedimentary habitats for migration because they lack large depositional bedforms such as gravel bars. Using genotypic data from seven microsatellite loci for a total of 713 individuals distributed among 25 demes, we found that demes had on average more alleles and were less differentiated in the river showing the most extensive alluvial deposits and shortest length of sediment supply‐limited channels. Population clusters were also of greater size, reaching up to 30 km in length. The longitudinal pattern of genetic differentiation in this sediment‐rich river was best explained by hydrologic distance and the longitudinal pattern of allelic richness was bell‐shaped, as expected under a stepping‐stone model with symmetrical migration. The length of sediment supply‐channels was more important than hydrologic distance in explaining the longitudinal distribution of genetic differentiation in the two other corridors facing a sediment shortage. Allelic richness decreased monotonically upstream in the most sediment‐poor river. This correlates with the expansion further downstream of sediment supply‐limited channels in this river, which is likely to decrease animal movement and hence gene flow among demes. This study provides the first evidence that the degree to which the hyporheic zone facilitates the movement of groundwater organisms varies greatly among rivers of contrasted geomorphology. Extending the application of riverscape genetics across a range of interstitial taxa and geomorphic settings holds much promise for assessing the contribution of the hyporheic zone to the dispersal of groundwater organisms.

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“…The freeze‐coring technique was used to measure the effective porosity in the bed‐sediment of each river (Descloux et al ., ). Before core extraction, the freezing operation required the injection of about 25 L of liquid nitrogen for 15 min.…”

Section: Methodsmentioning

confidence: 99%

Influence of hyporheic zone characteristics on the structure and activity of microbial assemblages

et al. 2013

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International audienceThe hyporheic zone is a pivotal environment for biogeochemical processes in riverine ecosystems. However, the responses of hyporheic microbial assemblage structure and activity to environmental variables remain poorly understood. The objective of this study was to determine the influence of hyporheic zone characteristics on microbial assemblages in three French rivers (Usses, Isere and Drome). For each river, microbial structure (assemblage composition and abundance) and activity were measured at three sites with contrasting environmental characteristics (e.g. effective streambed porosity, oxygen and nutrient concentrations). Firstly, we expected that the structure and activity of the hyporheic microbial assemblage would be significantly affected by the environmental characteristics of the hyporheic zone. We also expected a strong relationship between the structure and activity of hyporheic microbial communities in the Usses River, due to greater spatial heterogeneity (i.e. greater porosity differences between the studied sites) compared with the two other rivers. Our results showed that porosity reduction, greatest in the Usses River, affected the exchanges of flows and energy through the hyporheic zone and, consequently, led to a distinct microbial assemblage composition in comparison with the two other rivers. Significant relationships between bacterial assemblage structure and activity were detected for the Usses and Drome rivers, due to the greater spatial variability in sediment and physicochemical variables observed in these two rivers than in the Isere. Hyporheic zone characteristics (sediment permeability, water chemistry, particulate organic matter) appear to be the key factors controlling microbial structure and activity in riverine environments. As the hyporheic zone is essential for biogeochemical processes, including those attenuating pollution, a better quantification of the influences of environmental factors controlling microbial activity is needed to understand and predict ecosystem processes in the hyporheic zone

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Comparison of Different Techniques to Assess Surface and Subsurface Streambed Colmation with Fine Sediments

Cited by 44 publications

References 61 publications

Variation in reach-scale hydraulic conductivity of streambeds

Variation in reach-scale hydraulic conductivity of streambeds

Geomorphic influence on intraspecific genetic differentiation and diversity along hyporheic corridors

Influence of hyporheic zone characteristics on the structure and activity of microbial assemblages

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