Fine‐grained bed sediment storage within the main channel systems of the Frome and Piddle catchments, Dorset, UK

Collins, Adrian L.; Walling, D. E.

doi:10.1002/hyp.6269

Cited by 79 publications

(82 citation statements)

References 53 publications

(60 reference statements)

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“…Exe, 1.6%; Lambert and Walling 1988; Severn, 2%; Walling and Quine 1993; Leadon, Tone and Torridge, 0.9 to 1.5%; Wilson et al 2004) and can be appreciably higher than the Ehen (e.g. Frome and Piddle, 18-55%; Collins et al 2005;Tern, Pang and Lambourn, 21-38%;Collins and Walling 2007a). The contribution of stored sediment to the sediment budget in the Ehen is thus rather limited compared to other rivers in the UK.…”

Section: Fluvial Sediment Budget and Sources Of Materialsmentioning

confidence: 99%

“…Consequently, understanding patterns of in-channel sediment storage is critical for elucidating the sediment dynamics of a river, whether focused on the reach (e.g. Smith et al 2003;Collins and Walling 2007a) or network (e.g. Walling et al 1998;Wilson et al 2004) scale.…”

Section: Introductionmentioning

confidence: 99%

“…Conventional approaches comprise indirect and direct methods (Collins and Walling 2007a). Indirect methods rely on comparison of suspended sediment loads for upstream and downstream locations, to infer changes in sediment storage within the reach (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Of these, the resuspension method first presented by Lambert and Walling (1988) is being used increasingly (e.g. Collins and Walling 2007a;López-Tarazón et al 2011;Piqué et al 2014); it has been shown to perform well across different types of substrate and provides valuable information on material stored in both the surface and subsurface zones, as well as its size characteristics (Duerdoth et al 2015).…”

Section: Introductionmentioning

confidence: 99%

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Asynchronicity of fine sediment supply and its effects on transport and storage in a regulated river

et al. 2018

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Purpose A disconnected ephemeral tributary was reconnected to the regulated River Ehen (NW England) as part of a river restoration initiative, providing a renewed delivery of sediment to a highly stable and armoured channel. This paper (1) assesses spatial and temporal dynamics of suspended and stored sediments in the Ehen, (2) characterises the composition of stored sediment, (3) develops fine sediment budgets for downstream river reaches, and (4) assesses the controls on the storage of fine sediment in the riverbed. Materials and methods A 3-km study section in the upper part of the River Ehen was divided into two reaches. Suspended sediments were monitored at the downstream limits of each reach over a 2-year period. In-channel storage was measured in three morphological units within the upper reach, on 13 occasions over the same period. Samples were used to assess changes in volumes of stored fine sediment, as well as the grain sizes and organic content of the material. A time-lapse camera facing the confluence of the tributary was used to conceptualise different flow scenarios. These scenarios reflect the degree of synchronicity between flows in the main-stem and those in the tributary. Fine sediment budgets were developed for each reach to assess the relative contribution of different sources of sediment. Results and discussion The reconnection significantly affected suspended sediment loads in the Ehen. Bed storage increased twofold, with changes most evident in the slow-flowing morphological unit. Changes in the composition of stored sediment were less marked than changes in the quantity of material. Changes in bed storage were controlled by the degree of synchronicity between flows in the Ehen and those in the newly reconnected tributary. Results show that three generalised flow scenarios occur, with total asynchronicity between flows in the tributary and the Ehen being responsible for the main episodes of fine sediment deposition. Overall, the estimated sediment budgets provide insights into the importance of non-perennial sources of sediment in supply-limited systems such as the Ehen. Although bed storage values are within the range of those published for UK rivers, the increase observed since the reconnection, together with the persistence of a static pavement, highlights the ecologically critical conditions of the regulated main-stem River Ehen. Conclusions Intermittent sources control fine sediment transport dynamics in the upper River Ehen. In this regulated river, ongoing deposition associated with increased low-and medium-sized flow events exerts more of a control on bed storage than large but rare floods. Management actions to limit delivery of material from lateral sources could help prevent further deterioration of habitat conditions for biota sensitive to fine sediment. Given the ongoing adjustment in the newly reconnected tributary, continued monitoring is needed to capture further morphosedimentary response in the main-stem.

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Section: Fluvial Sediment Budget and Sources Of Materialsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Asynchronicity of fine sediment supply and its effects on transport and storage in a regulated river

et al. 2018

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“…Agricultural phosphorus inputs to rivers were estimated using the PSYCHIC (Phosphorus and Sediment Yield CHaracterization In Catchments) model (Collins et al, 2007;Davison et al, 2008;Stromqvist et al, 2008). The PSYCHIC model is a monthly time-step model with explicit representation of surface and drain flow hydrological pathways, particulate and solute mobilisation, and incidental losses associated with fertiliser and manure spreading.…”

Section: Agriculture Including Rough Grazing and Forestmentioning

confidence: 99%

A model‐based assessment of non‐compliance of phosphorus standards for lakes in England and Wales

Duethmann

Anthony

Carvalho

et al. 2009

International Journal of River Basin Management

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High phosphorus concentrations causing eutrophication will prevent many lakes in England and Wales from reaching good ecological status by 2015 according to the EC Water Framework Directive (WFD). The aim of this study was to estimate the percentage of lakes in England and Wales that are likely to fail recently agreed WFD phosphorus standards. As measured lake phosphorus concentrations are only available for a small number of lakes a model-based approach was adopted. This involved estimating phosphorus loads from a wide range of sources including agricultural loads, sewage effluents, septic tanks, diffuse urban sources, atmospheric deposition, groundwater and bank erosion. Lake phosphorus concentrations were predicted using the Vollenweider model, and the model framework was satisfactorily tested against available observed lake concentration data. Applying the model to all lakes in England and Wales greater than 1 ha, it was estimated that under current conditions, roughly two thirds of the lakes would fail good ecological status with respect to phosphorus. According to our estimates, agricultural phosphorus loads represent the dominant source for the majority of catchments, but diffuse urban runoff also is important in many lakes and sewage effluents are the most frequent dominant source for lake catchments greater than 100 km 2 . Required reductions of phosphorus loads to increase the number of lakes achieving good ecological status and potential delays because of internal loading and biological resistances are briefly discussed.

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Modeling the rate of turnover of DOC and particulate organic carbon in a UK, peat‐hosted stream: Including diurnal cycling in short‐residence time systems

Worrall

Moody

2014

JGR Biogeosciences

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This study proposes a multicomponent, multiprocess scheme to explain the turnover of organic matter (particulate and dissolved organic matter) in streams. The scheme allows for production and degradation of organic matter by both photic and aphotic processes with transformation of dissolved organic carbon (DOC) to increasingly refractory forms. The proposed scheme was compared to 10 months of experimental observations of the turnover and fate of particulate and dissolved organic matter in stream water from a peat-covered catchment. The scheme was able to explain average decline in DOC concentration of 65% over 70 h with a 13% mean average percentage error based on turnover in three types of organic matter (particulate, labile dissolved, and refractory dissolved) although the order and rate of reactions did change between sets of experimental observations. The modeling suggests that activation energies are low for all except the most refractory forms of DOC in turn, suggesting that processes are not sensitive to temperature change. Application of the modeling scheme to organic matter turnover in the River Tees, northern England, showed that annual removal of total organic carbon was equivalent to between 13 and 33 t C/km 2 /yr from an at source export of between 22 and 56 t C/km 2 /yr giving a total in-stream loss rate of between 53 and 62% over a median in-stream residence time of 35 h.

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Fine‐grained bed sediment storage within the main channel systems of the Frome and Piddle catchments, Dorset, UK

Cited by 79 publications

References 53 publications

Asynchronicity of fine sediment supply and its effects on transport and storage in a regulated river

Asynchronicity of fine sediment supply and its effects on transport and storage in a regulated river

A model‐based assessment of non‐compliance of phosphorus standards for lakes in England and Wales

Modeling the rate of turnover of DOC and particulate organic carbon in a UK, peat‐hosted stream: Including diurnal cycling in short‐residence time systems

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