A method for applying fluvial geomorphology in support of catchment-scale river restoration planning

1. This paper reports on an extension to the use of Fluvial Audit survey to include a subjective and adaptive multi-criteria assessment (MCA) process that integrates scientific literature and observational data to develop three reach-scale indices of: (a) channel modification; (b) channel function (sediment store or source); and (c) naturalness. These indices are nested within an overall conceptual model of channel evolution and used to underpin catchment scale river restoration. 2. The approach is described and applied to a small groundwater dominated river in the UK. The results show that over 48% of the total main river was in a degraded state relative to a conceptual model of a natural reference state. Only 23% of the river was in a near-natural state. 3. MCA classifications were translated into a set of management actions necessary to return each reach to a near-natural condition. These are described. 4. The method offers a transparent decision support for stakeholders that can incorporate differing scientific evidence. The use of MCA enables flexibility in terms of the relative importance of scores and weights placed upon factors in the final classification. This makes the approach amenable to stakeholder and public consultation.

[1]  William L. Graf,et al.  Damage Control: Restoring the Physical Integrity of America’s Rivers , 2001 .

[2]  J. Phillips.  Contingency and generalization in pedology, as exemplified by texture-contrast soils , 2001 .

[3]  M. Naura,et al.  The development of physical quality objectives for rivers in England and Wales , 2002 .

[4]  Stephen E. Darby,et al.  Does scientific conjecture accurately describe restoration practice? Insight from an international river restoration survey , 2006 .

[5]  Stephen J. Carver,et al.  Integrating multi-criteria evaluation with geographical information systems , 1991, Int. J. Geogr. Inf. Sci..

[6]  Malcolm Newson,et al.  Sediment‐related river maintenance: The role of fluvial geomorphology , 1995 .

[7]  Florent Joerin,et al.  Using GIS and outranking multicriteria analysis for land-use suitability assessment , 2001, Int. J. Geogr. Inf. Sci..

[8]  S. Ormerod.  A golden age of river restoration science , 2004 .

[9]  C. Frissell,et al.  A hierarchical framework for stream habitat classification: Viewing streams in a watershed context , 1986 .

[10]  J. Wiens.  Riverine landscapes: taking landscape ecology into the water , 2002 .

[11]  D. Sear.  River restoration and geomorphology , 1994 .

[12]  J. Wheaton,et al.  The Scope of Uncertainties in River Restoration , 2008 .

[13]  D. Sear,et al.  The application of palaeohydrology in river management , 2006 .

[14]  Joseph M. Wheaton,et al.  Spawning habitat rehabilitation ‐ II. Using hypothesis development and testing in design, Mokelumne river, California, U.S.A. , 2004 .

[15]  M. Stewardson,et al.  Conceptual and Mathematical Modelling in River Restoration: Do We Have Unreasonable Confidence? , 2008 .

[16]  K. Fryirs,et al.  River Styles, a Geomorphic Approach to Catchment Characterization: Implications for River Rehabilitation in Bega Catchment, New South Wales, Australia , 2000, Environmental management.

[17]  Peter J.A. Fox,et al.  An account of the derivation and testing of a standard field method, River Habitat Survey , 1998 .

[18]  Stewart J. Clarke,et al.  Linking form and function: towards an eco-hydromorphic approach to sustainable river restoration , 2003 .

[19]  P. Gibbard,et al.  The history of the major rivers of southern Britain during the Tertiary , 2003, Journal of the Geological Society.

[20]  D. Montgomery,et al.  Channel-reach morphology in mountain drainage basins , 1997 .

[21]  A. Brown.  Learning from the past: palaeohydrology and palaeoecology , 2002 .

[22]  M. Clark,et al.  Supporting complex decisions for sustainable river management in England and Wales , 2002 .

[23]  R. Ferguson.  Emergence of abrupt gravel to sand transitions along rivers through sorting processes , 2003 .

[24]  Mike Furse,et al.  Preparing for the European Water Framework Directive — making the links between habitat and aquatic biota , 2002 .

[25]  P. Atkinson,et al.  Exploring the Relations Between Riverbank Erosion and Geomorphological Controls Using Geographically Weighted Logistic Regression , 2002 .

[26]  F. H. Dawson,et al.  Groundwater dominated rivers , 1999 .

[27]  A. Large,et al.  ‘Natural’ rivers, ‘hydromorphological quality’ and river restoration: a challenging new agenda for applied fluvial geomorphology , 2006 .

[28]  Greg . Smith,et al.  The Gravel-Sand Transition Along River Channels , 1995 .

[29]  P. J. Boon,et al.  Towards an integrated approach to classifying and evaluating rivers in the UK , 1998 .