Macrophytes and suspension-feeding invertebrates modify flows and fine sediments in the Frome and Piddle catchments, Dorset (UK)

Wharton, Geraldene; Cotton, Jacqueline A.; Wotton, Roger S.; Bass, J. A. B.; Heppell, Catherine M.; Trimmer, Mark; Sanders, Ian A; Warren, Luke L.

doi:10.1016/j.jhydrol.2006.04.034

Cited by 88 publications

(109 citation statements)

References 45 publications

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“…In such a vegetated case, the vertical profiles of velocity are no longer logarithmic (e.g. Green, 2005;Naden et al, 2006;Wharton et al, 2006) and the resistance to the flow is significantly derived from the drag force due to vegetation rather than the bed friction or resistance associated with secondary flow (Rameshwaran and Shiono, 2007). The hydraulic impacts of weed cutting were monitored as described below.…”

Section: River Hydraulicsmentioning

confidence: 99%

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Instream and riparian implications of weed cutting in a chalk river

Old

Naden

Rameshwaran

et al. 2014

Ecological Engineering

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were monitored at a site on the River Lambourn (The CEH River Lambourn Observatory) and major instream and riparian impacts were observed. Measurements clearly demonstrated how weed cutting enhanced flood flow conveyance, reduced water levels (river and wetland), increased river velocities, and mobilised suspended sediment (with associated chemicals) and reduced the capacity for its retention within the river channel. Potential implications in relation to flood risk, water resources, downstream water quality, instream and riparian ecology, amenity value of the river, and wetland greenhouse gas emissions were considered. Provided the major influence of macrophytes on instream and riparian environments is fully understood then the manipulation of macrophytes represents an effective management tool that demonstrates the great potential of working with nature.

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Section: River Hydraulicsmentioning

confidence: 99%

“…Wharton et al, 2006). Warren et al (2009) observed how sediment deposits may remain following a weed cut owing to the stabilising effect of biofilms.…”

Section: Retention and Mobilisation Of Fine Sediment And Associated Cmentioning

confidence: 99%

Instream and riparian implications of weed cutting in a chalk river

Old

Naden

Rameshwaran

et al. 2014

Ecological Engineering

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“…Kalbus et al (2008a,b) assumed in their simulations that the streambed had the same properties as the aquifer and thus they did not parametrize the streambed elements in the model differently from the aquifer elements. However, it is often presumed that streambed sediments are characterized by lower permeabilities due to clogging effects resulting from the deposition of fine-grained sediment and organic matter (e.g., Sophocleous et al, 1995;Su et al, 2004), siltation around macrophytes (e.g., Wharton et al, 2006), or bacterial growth and biofilms (e.g., Boulton et al, 1998;Pusch et al, 1998). These low-K layers could effect the distribution of fluxes across the streambed.…”

Section: Introductionmentioning

confidence: 99%

Influence of aquifer and streambed heterogeneity on the distribution of groundwater discharge

Kalbus

Schmidt

Molson

et al. 2009

Hydrol. Earth Syst. Sci.

121

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Abstract. The spatial distribution of groundwater fluxes through a streambed can be highly variable, most often resulting from a heterogeneous distribution of aquifer and streambed permeabilities along the flow pathways. Using a groundwater flow and heat transport model, we defined four scenarios of aquifer and streambed permeability distributions to simulate and assess the impact of subsurface heterogeneity on the distribution of groundwater fluxes through the streambed: (a) a homogeneous low-K streambed within a heterogeneous aquifer; (b) a heterogeneous streambed within a homogeneous aquifer; (c) a well connected heterogeneous low-K streambed within a heterogeneous aquifer; and (d) a poorly connected heterogeneous low-K streambed within a heterogeneous aquifer. The simulation results were compared with a base case scenario, in which the streambed had the same properties as the aquifer, and with observed data. The results indicated that the aquifer has a stronger influence on the distribution of groundwater fluxes through the streambed than the streambed itself. However, a homogeneous low-K streambed, a case often implemented in regional-scale groundwater flow models, resulted in a strong homogenization of fluxes, which may have important implications for the estimation of peak mass flows. The flux distributions simulated with heterogeneous low-K streambeds were similar to the flux distributions of the base case sceCorrespondence to: E. Kalbus (edda.kalbus@web.de) nario, despite the lower permeability. The representation of heterogeneous distributions of aquifer and streambed properties in the model has been proven to be beneficial for the accuracy of flow simulations.

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“…Recent flume-based and field studies (e.g. Wharton et al 2006;Heppell et al 2009;Harvey et al 2011;Jones et al 2011;Salant 2011) have also demonstrated that both macrophytes and periphyton are important in controlling sediment deposition and resuspension within river channels. According to Harvey et al (2011) "physical-biological interactions and resulting effects on sediment and nutrient redistribution are arguably some of the principal drivers of ecological function and hydrogeomorphic evolution of aquatic systems….. and deserve more study".…”

Section: In-channel Sediment-vegetation Dynamicsmentioning

confidence: 99%

Recent advances and future directions in soils and sediments research

Owens

2011

J Soils Sediments

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Macrophytes and suspension-feeding invertebrates modify flows and fine sediments in the Frome and Piddle catchments, Dorset (UK)

Cited by 88 publications

References 45 publications

Instream and riparian implications of weed cutting in a chalk river

Instream and riparian implications of weed cutting in a chalk river

Influence of aquifer and streambed heterogeneity on the distribution of groundwater discharge

Recent advances and future directions in soils and sediments research

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