Sediment transport on the Freiston Shore managed realignment site: An investigation using environmental magnetism

Rotman, Robin M.; Naylor, Larissa A.; McDonnell, Rachael; Niocaill, Conall Mac

doi:10.1016/j.geomorph.2007.12.006

Cited by 38 publications

(24 citation statements)

References 41 publications

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“…French et al, 2000;Rotman et al, 2008). High resolution data are provided on site hydrodynamics, and the preservation and occurrence of sedimentation rhythms for two infilling sites heavily altered during site construction in an open coast MR site.…”

Section: Resultsmentioning

confidence: 99%

“…Rotman et al, 2008;Symonds and Collins, 2005). However, the Medmerry MR scheme is located on an open coast, a considerable distance (approximately 7.5 km eastwards from Chichester Harbour entrance and on the opposite side of the peninsular from Pagham Harbour) from any external preexisting saltmarshes, and is banked by a shingle beach.…”

Section: Fettweis Et Al 1998)mentioning

confidence: 99%

“…As a result, many European and North American coastal wetland environments have become severely degraded (Wolters et al, 2005). The international importance of intertidal saltmarshes and mudflats has only been realised in recent decades (Rotman et al, 2008). These environments provide a range of ecosystem, economic and cultural services such as wildlife habitat, carbon sequestration, immobilisation of pollutants, water quality improvements, social and recreation opportunities and protection from coastal flooding (Costanza et al, 1997;King and Lester, 1995;Moller et al, 2014;Moller et al, 1999Moller et al, , 2001Tempest et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

“…ETDC processes vary temporally and spatially, and significantly impact on the development of newly inundated intertidal environments and their associated habitat (Rotman et al, 2008) and therefore site ecosystem services. Whilst sufficient sediment accumulation is required for habitat creation (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…For example the saltmarsh neighbouring the Freiston Shore MR site (UK) experienced rapid erosion (Symonds and Collins, 2007) following site inundation. Eroded material were transported into the MR site, building in the newly inundated area at the expense of the adjacent saltmarsh and undermining the success of the habitat creation scheme (Rotman et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

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Sedimentation rhythms and hydrodynamics in two engineered environments in an open coast managed realignment site

2017

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Managed Realignment (MR) schemes are considered by many coastal managers and engineers to be a preferable method of coastal flood defence and compensating for habitat loss, by creating new areas of intertidal saltmarsh and mudflat habitat. Monitoring of MR sites has tended to focus on short term ecological factors, resulting in a shortage of high frequency, high resolution long term measurements of the evolution of the sediment erosion, transportation, deposition and consolidation cycle (ETDC) in newly breached sites. This is particularly true of analysis of the formation and preservation of sedimentary rhythmites and evaluations of sedimentation rates (and their variability) in newly inundated intertidal environments. This study provides an evaluation of sedimentation rhythms and hydrodynamics from two contrasting sites within the Medmerry Managed Realignment scheme, the largest open coast realignment in Europe (at the time of site inundation). Bed sediment altimeter data highlighted different sedimentation patterns at the two sites; near constant deposition of sediment occurred near the breach resulting in 15.2 cm of sediment being accreted over the one year monitoring period, whereas periodic accretion and erosion of sediment occurred inland leading to 2.7 cm of net accretion. Differences in the relationship between suspended sediment concentrations and site hydrodynamics were observed on a semi-diurnal to annual scale. This study highlights the need for further consideration of the sedimentation processes in MR schemes in order to enhance the design and construction of these sites. Advancements in the understanding of these processes will increase the success of MR schemes in terms of the evolution of the sediment regime and the ecosystem services provided, particularly as they are more widely accepted as a form of coastal flood defence and intertidal habitat creation method.

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Section: Resultsmentioning

confidence: 99%

Section: Fettweis Et Al 1998)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Sedimentation rhythms and hydrodynamics in two engineered environments in an open coast managed realignment site

2017

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Post-Little Ice Age Development of a High Arctic Paraglacial Beach Complex

Strzelecki

Long

Lloyd

2015

Permafrost and Periglac. Process.

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We reconstruct the behaviour of a High Arctic gravel-dominated beach complex that has developed in central Spitsbergen, Svalbard, since the end of the Little Ice Age (LIA). The studied coastal environment in northern Billefjorden (Petuniabukta) is characterised by limited wave action and ephemeral sediment delivery from nonglaciated, mainly snow-fed fans and talus slopes. Aerial photographic evidence and morpho-sedimentological observations of a beach-ridge plain and spit complex in northern Billefjorden reveal a dynamic coastal system. During the post-LIA period, a prominent coastal barrier at the mouth of the Ebbaelva migrated seawards several tens of metres and prograded northwards to form new spit systems, each > 150 m in length. The post-LIA coastal evolution occurred in two main phases. In the first half of the 20 th century, increased paraglacial sediment released by retreating land-based glaciers led to the development of a subaqueous spit platform and the progradation of an ebb-tide delta into the mouth of the Ebbaelva, diverting its mouth to the northwest. In the second half of the 20 th century, the barrier prograded onto this platform, promoting the development of three massive spits. Sedimentological data suggest that changes in beach-ridge composition that occurred during the 20 th century are linked to episodic sediment delivery from an adjacent permafrost and snow-fed alluvial fan and delta system. Our work provides a basis for a new model of paraglacial barrier development that recognises the fundamental role of climate and sediment supply as two intimately connected processes that control coastal development in the High Arctic over decadal to centennial timescales.

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Managed Realignment

Esteves¹

2015

Encyclopedia of Estuaries

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Sediment transport on the Freiston Shore managed realignment site: An investigation using environmental magnetism

Cited by 38 publications

References 41 publications

Sedimentation rhythms and hydrodynamics in two engineered environments in an open coast managed realignment site

Sedimentation rhythms and hydrodynamics in two engineered environments in an open coast managed realignment site

Post-Little Ice Age Development of a High Arctic Paraglacial Beach Complex

Managed Realignment

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