Browsing by Author "Gurnell, Angela M."

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    The current state of the use of large wood in river restoration and management
    (Wiley, 2019-03-25) Grabowski, Robert C.; Gurnell, Angela M.; Burgess‐Gamble, Lydia; England, Judy; Holland, David; Klaar, Megan J.; Morrissey, Ian; Uttley, Chris; Wharton, Geraldene
    Trees fall naturally into rivers generating flow heterogeneity, inducing geomorphological features, and creating habitats for biota. Wood is increasingly used in restoration projects and the potential of wood acting as leaky barriers to deliver natural flood management by ‘slowing the flow’ is recognised. However, wood in rivers can pose a risk to infrastructure and locally increase flood hazards. The aim of this paper is to provide an up‐to‐date summary of the benefits and risks associated with using wood to promote geomorphological processes to restore and manage rivers. This summary was developed through a workshop that brought together academics, river managers, restoration practitioners and consultants in the UK to share science and best practice on wood in rivers. A consensus was developed on four key issues: (i) hydrogeomorphological effects, (ii) current use in restoration and management, (iii) uncertainties and risks and (iv) tools and guidance required to inform process‐based restoration and management.
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    An example application of the CEN Water quality — Guidance standard for assessing the hydromorphological features of rivers to the River Frome, Dorset, Southern England
    (UK Centre for Ecology and Hydrology, 2020-10-01) Gurnell, Angela M.; Grabowski, Robert C.
    This report documents a comprehensive application of the framework proposed in CEN Standard CEN/ TC 230/ WG 25/ EN14614 to the River Frome, Dorset, Southern England. Therefore, this report needs to be read with reference to that Standard. The framework was first developed in REFORM, a European Union Framework 7 project (Grant Agreement 282656), established to improve the success of hydromorphological restoration. The Standard determines the natural hydromorphological condition of rivers for many applications. It is appropriate for long-term, catchment-scale management, e.g. river basin planning and implementation. It is also able to support assessments for site-scale, project delivery, e.g. flood management schemes, channel maintenance and channel restoration. The hierarchical and multiscale nature of the analysis illustrated in this report provides causative links between catchment processes and local scale hydromorphological conditions; for example, how catchment scale issues influence fine sediment erosion, transfer and deposition. In this way it can facilitate the application of a DPSIR (Drivers, Pressures, State, Impact, Response) model of management intervention, illustrate causes and consequences, and help target sustainable management solutions.
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    A hierarchical multi-scale framework and indicators of hydromorphological processes and forms
    (European Commission within the 7th Framework Programme, 2014-10-30) Gurnell, Angela M.; Bussettini, M.; Camenen, B.; González Del Tánago, M.; Grabowski, Robert C.; Hendriks, D.; Henshaw, A.; Latapie, A.; Rinaldi, M.; Surian, N.
    Background and Introduction to Deliverable 2.1. Work Package 2 of REFORM focuses on hydromorphological and ecological processes and interactions within river systems with a particular emphasis on naturally functioning systems. It provides a context for research on the impacts of hydromorphological changes in Work Package 3 and for assessments of the effects of river restoration in Work Package 4. Deliverable 2.1 of Work Package 2 proposes a hierarchical framework to support river managers in exploring the causes of hydromorphological management problems and devising sustainable solutions. The deliverable has four parts. Part 1 (this volume) provides a full description of the hierarchical framework and describes ways in which each element of it can be applied to European rivers and their catchments. Part 2 includes thematic annexes which provide more detailed information on some specific aspects of the framework described in Part 1. Part 3 includes catchment case studies which present the application of the entire framework described in Part 1 to a set of European catchments located in different biogeographical zones. Part 4 includes catchment case studies which present a partial application of the framework described in Part 1 to a further set of European catchments.
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    Hydrogeomorphology-ecology interactions in river systems
    (WIley, 2016-02-03) Grabowski, Robert C.; Gurnell, Angela M.
    The European Union-funded REFORM (REstoring rivers FOR effective catchment Management) project has developed guidance and tools aimed at making river restoration and mitigation measures more effective. A major component of this work has been to investigate functional linkages between the hydrogeomorphology and ecology of rivers. This special collection presents some of the outputs from this work concerning interactions between hydrological, geomorphological and ecological processes in naturally functioning river systems. Together, this set of five papers reviews some of the existing knowledge on interactions and feedbacks between hydrogeomorphology and ecology in river systems and outlines how hydrogeomorphological processes, ecological processes and plant traits contribute to driving river corridor dynamics that create and sustain a diversity of aquatic and wetland habitats that support fish communities.