Banked realignment: a case study from the Humber Estuary, UK

Pontee, Nigel; Hull, Stephen; Moore, J. Robert

doi:10.1680/ensu.2006.159.3.99

Cited by 3 publications

(5 citation statements)

References 8 publications

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“…Managed realignment is increasingly seen as an integral component of sustainable estuary management (e.g., PONTEE, HULL, and MOORE, 2006). COOPER (2003) identifies a number of circumstances in which realignment is often the preferred engineering approach.…”

Section: Discussionmentioning

confidence: 99%

Hydrodynamic Modelling of Estuarine Flood Defence Realignment as an Adaptive Management Response to Sea-Level Rise

French

2008

Journal of Coastal Research

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FRENCH, J.R., 2008. Hydrodynamic modelling of estuarine flood defence realignment as an adaptive management response to sea-level rise. A numerical hydrodynamic model is used to investigate the sensitivity of a morphologically complex and heavily ''engineered'' mesotidal estuary to idealized sea-level rise scenarios and to evaluate the appropriateness of managed realignment as an adaptive response to sea-level rise. The hydrodynamic regime of the Blyth estuary (Suffolk, eastern England) is governed by a distinctive morphology that has resulted from the abandonment of a reclaimed midestuary tidal floodplain in the 1920s and 1940s. Hypsometric characteristics (extensive intertidal area and constricted inlet dimensions) make the outer estuary potentially sensitive to sea-level rise. Model results indicate that a sea-level rise of 0.3 m (as a best estimate scenario for 2050) could increase peak tidal current velocities and discharges by up to 20% and 28%, respectively. Extensive areas of potential tidal floodplain remain protected by embankments that will require upgrading to cope with sea-level rise. Realignment (or ''managed retreat'') of these defences can reduce local flood defence costs by eliminating unsustainable seawall but needs to be evaluated in the light of wider impacts.Modelling of hypothetical realignment scenarios shows that restoration of tidal exchange to the largest flood compartments could have an immediate effect on outer estuary hydrodynamics that is larger than worst case scenarios for half a century of accelerated sea-level rise (peak velocity and discharge increased by up to 35% and 32%, respectively). More generally, incompatibilities are apparent between flood defence and habitat restoration objectives, such that the appropriateness and feasibility of large-scale flood defence realignment could be questionable in estuarine contexts.

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Section: Discussionmentioning

confidence: 99%

Hydrodynamic Modelling of Estuarine Flood Defence Realignment as an Adaptive Management Response to Sea-Level Rise

French

2008

Journal of Coastal Research

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“… 80 Morris 12 Pendle 61 Pontee et al . 81 Steart 52.1983 −3.0506 2014 2014; 2015; 2016 3 Burgess et al . 82 Townsend 83 Wright et al .…”

Section: Methodsmentioning

confidence: 99%

“…71 Hampshire 72 Luisetti 9 Morris 12 Pontee (in Esteves) 65 Pontee et al . 81 Creek design strategies considered: 1 = absence of initial creeks; 2 = excavation of a creek system from a natural template; 3 = excavation of artificial creeks in the absence of a natural template. …”

Section: Methodsmentioning

confidence: 99%

Morphological evolution of creek networks in 10 restored coastal wetlands in the UK

et al. 2022

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Coastal wetlands provide crucial ecosystem services including flood protection and carbon storage, but are being lost rapidly worldwide to the combined effects of sea-level rise, erosion and coastal urbanisation. Managed Realignment (MR) aims to mitigate for these losses by restoring reclaimed land to tidal influence. Data of creek evolution is critical to assess the performance of design strategies and improve design and implementation practices. This data descriptor provides a dataset of the horizontal morphological evolution of creek systems from various initial conditions in 10 MR schemes across the UK. Using a semi-automated workflow, morphological creek parameters were extracted from 52 lidar datasets at 1 m horizontal resolution spanning 2 to 20 years post-breach. This constitutes the most comprehensive systematic monitoring of MR creek morphology to date. The dataset will assist future MR design and provide baseline morphological information for ecological and biogeochemical surveying.

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“…The design of the scheme made extensive use of a geographic information system (GIS) in order (a) to predict the future ratio of mudflat to saltmarsh based on the known elevation ranges of habitats 9,33 (b) that the volumes of material required for the new flood defences could be obtained from a combination of the existing defences to be dismantled and material obtained by lowering the elevations within the scheme. 28 (Fig. 2).…”

Section: Types Of Managed Realignmentmentioning

confidence: 97%

“…The main reasons for the adoption of breached realignment appear to have been the requirements to promote high accretion rates, recreate saltmarsh habitats and minimise earth works. Pontee et al 28 suggested that these schemes may have 'set the trend' for subsequent realignment schemes, with many developers and conservation bodies beginning to consider breached realignment as the preferred approach in all instances.…”

Section: Types Of Managed Realignmentmentioning

confidence: 99%

Realignment in low-lying coastal areas: UK experiences

Pontee¹

2007

Proceedings of the Institution of Civil Engineers - Maritime En

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The present paper reviews the context of realignment in the UK from both a coastal process and policy context, and explains the approaches that can be adopted to implement realignment. A number of case studies are then presented covering both estuarine managed realignment schemes involving the removal of flood embankments; and natural barriers beaches where realignment is likely. The paper demonstrates that while realignment leads to more natural coasts, such approaches are not without their disadvantages. The breaching of coastal defences, be they natural or man-made, has environmental, social and economic implications. Although policies involving realignment might be the most sustainable solutions in theory, this does not mean that they will be immediately embraced by the public, when they have come to expect continued flood protection. It is suggested that the promulgation of policies involving realignment requires a number of elements including increasing public awareness of coastal change, floodproofing properties, providing temporary defence measures, restricting the development of new properties and considering governmental compensation for affected home owners.

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Banked realignment: a case study from the Humber Estuary, UK

Cited by 3 publications

References 8 publications

Hydrodynamic Modelling of Estuarine Flood Defence Realignment as an Adaptive Management Response to Sea-Level Rise

Hydrodynamic Modelling of Estuarine Flood Defence Realignment as an Adaptive Management Response to Sea-Level Rise

Morphological evolution of creek networks in 10 restored coastal wetlands in the UK

Realignment in low-lying coastal areas: UK experiences

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