The Sustainability of Restored Rivers: Catchment‐Scale Perspectives on Long Term Response

Gregory, K. J.; Downs, Peter W.

doi:10.1002/9780470867082.ch13

Cited by 9 publications

(11 citation statements)

References 63 publications

(82 reference statements)

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“…There has also been a shift towards incorporating catchment scale processes into river restoration rather than focussing on individual reaches in isolation (Clarke et al . ; Gregory & Downs ) as explicitly demonstrated by new funding strands in the England and Wales. However, on the basis of Fig.…”

Section: Discussionmentioning

confidence: 99%

Analysis of UK river restoration using broad‐scale data sets

Smith

Clifford

Mant

2013

Water & Environment J

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This paper uses data from the UK River Restoration Centre's National River Restoration Inventory (NRRI) and the UK Environment Agency's River Habitat Survey (RHS) to analyse the relationship between restoration technique and the physical catchment context in which they have been implemented. Specifically we tested the relationship between categories of restoration technique and energy conditions, the relationship between restoration project and degree of channel modification, and whether the associations between restoration and physical catchment attributes have changed over time. Significant associations between categories of restoration technique and catchment variables were found, with direct morphological interventions needed in lower energy conditions; however, the analysis shows no change over time. This work shows that analysis of existing data sets can provide useful information to support the science and practice of river restoration and suggests that further analysis of existing ecological and geomorphological data sets provides an important learning opportunity to strengthen river restoration.

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Section: Discussionmentioning

confidence: 99%

Analysis of UK river restoration using broad‐scale data sets

Smith

Clifford

Mant

2013

Water & Environment J

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“…In light of the inherent complexity that appears to characterize river systems and their response to management interventions, there will remain uncertainty as to the response of a given river to a restoration . Additionally, time lags related to processes such as nutrient supply via groundwater and response to changes in sediment supply following catchment management approaches can delay for years to decades the expected improvement in river integrity …”

Section: Discussion: Blending Ecological and Social Objectives For Rimentioning

confidence: 99%

“…There has also been a shift toward river restoration in a catchment context, rather than focusing on individual reaches in isolation as explicitly demonstrated by the Water Framework Directive (WFD), and catchment‐based management in Australia, Japan, and South Africa . Although previously many projects focused on creating and imposing a desired river form, such as a meander bend, with little appreciation of dominant hydrological and geomorphological processes, best practice now emphasizes the need for restoration to take account of catchment‐scale processes …”

Section: Changing Motivationsmentioning

confidence: 99%

The changing nature of river restoration

2014

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River restoration is a rapidly maturing focus of scientific and practitioner activity, which draws on a long history of intervention in watercourses for varied economic and social reasons, and which reflects a changing dynamic in the wider relationship between nature and society. This review provides a brief analysis of international literature to assess changes in the drivers of river restoration and the effect of legislative drivers on the nature of river restoration projects. In the UK and Europe, the period after the implementation of the Water Framework Directive is marked by a clear shift to a more ecological framing of river restoration. The increasing ecological focus of stated goals for restoration, and its use as a tool to fulfill legislative requirements, places a greater emphasis on the need for appropriate restoration design, monitoring, and appraisal to clearly demonstrate the ecological benefits of restoration projects. The role of restoration as a community‐based activity is increasingly important, and citizen science monitoring frameworks, together with reanalysis of existing datasets provide an opportunity to increase the knowledge‐base supporting river restoration, and to integrate restoration motives and drivers with project design and evaluation. Blended participatory approaches and an ecosystem goods and services approach encourage this kind of integration, but will be effective only if conflicts between stakeholders with differing worldviews and objectives can be identified and managed. This article is categorized under: Water and Life > Conservation, Management, and Awareness

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“…Gregory () and Gregory and Downs () used the Schumm () and Graf () approaches to describe the kinetics of river response after a disturbance. If a system in equilibrium (initial equilibrium) is perturbed modifying a driver variable, a transient period will start.…”

Section: State Of Art and Contextmentioning

confidence: 99%

“…These conceptual models, including the model presented in this work, do not consider the temporal evolution, which is only possible to take into account in numerical models. Gregory (2006) and Gregory and Downs (2008) used the Schumm (1979) and Graf (1977) approaches to describe the kinetics of river response after a disturbance. If a system in equilibrium (initial equilibrium) is perturbed modifying a driver variable, a transient period will start.…”

Section: The Equilibrium Conditions and Time Scale Of Changesmentioning

confidence: 99%

Predicting the geomorphological responses of gravel‐bed rivers to flow and sediment source perturbations at the watershed scale: an application in an Alpine watershed

Alcayaga

Mao

Belleudy

2017

Earth Surf Processes Landf

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Predicting morphological channel changes using physically‐based models requires extended data for the description of the river channel and for hydrological and sedimentological inputs. At the watershed scale, these data are usually scarce, and such a refined modeling is typically difficult to build. A simpler modeling of the morphological impacts due to the changes in the principal drivers that control channel shape and dynamics is more adaptable. In this study we focused on the morphological responses of gravel‐bed rivers to flow and sediment source perturbation at watershed scale. The aim is to develop and test a tool capable of semi‐quantitatively predicting the morphological river response at the watershed scale due to a set of spatially distributed perturbations. The model considers flow regime (Q) and sediment supply (S) as the two main factors controlling the fluvial morphology in alluvial rivers. Two indicators have been proposed to evaluate the alteration on Q and S, and they are illustrated as vectors on each reach of the river network. The magnitude of the vectors corresponds to the intensity of the perturbation and its direction represents the changing trend that nine selected morphological variables (bed elevation, slope, width, depth, wetted area, width to depth ratio, d50, terrace formation, and colonization of vegetation) are likely to follow from an initial state. The trends or trajectories of changes were assessed based on empirical relations, case studies, and conceptual models. This method was applied to the Isère watershed (5700 km2) at Grenoble (France), a river that hosts large and complex hydropower plant systems constructed during 50s ‐70s. The predictions over 23 river reaches and eight variables were evaluated in the range where the model was capable of predicting the morphological evolution of the river system. Its performance was verified and in the majority of the cases the results were coherent with field surveys and previous observations. The results indicate that this is a complex problem which needs more careful consideration of constraints that are difficult to assess, such as simultaneous and different sources of perturbations, hypotheses of initial dynamic equilibrium, and sediment supply quantification. Copyright © 2017 John Wiley & Sons, Ltd.

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The Sustainability of Restored Rivers: Catchment‐Scale Perspectives on Long Term Response

Cited by 9 publications

References 63 publications

Analysis of UK river restoration using broad‐scale data sets

Analysis of UK river restoration using broad‐scale data sets

The changing nature of river restoration

Predicting the geomorphological responses of gravel‐bed rivers to flow and sediment source perturbations at the watershed scale: an application in an Alpine watershed

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