Seabed dynamics in a lage coastal embayment: 180 years of morphological change in the outer Thames estuary

Burningham, Helene; French, Jon

doi:10.1007/s10750-011-0760-y

Cited by 15 publications

(9 citation statements)

References 19 publications

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“…Source: Tomczak (1996). dominant southwesterly winds and northeasterly storms (Burningham and French, 2011); inshore wave directions are more variable, between NE and SW.…”

Section: Wave Climatementioning

confidence: 99%

See 1 more Smart Citation

Southern North Sea storm surge event of 5 December 2013: Water levels, waves and coastal impacts

Spencer

Brooks

Evans

et al. 2015

Earth-Science Reviews

154

127

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The storm surge event that affected the coastal margins of the southern North Sea on 5-6 December 2013 produced the highest still water levels on record at several tide gauges on the UK east coast. On east-facing coasts south of the Humber estuary and north-facing Norfolk, water levels were higher than in the twentieth century benchmark surge event of 31 January-1 February 1953. Maximum significant wave heights were highest off the North Norfolk coast (peak H s = 3.8 m offshore, 2.9 m inshore) and lowest off the Suffolk coast (H s = 1.5-1.8 m inshore); comparable offshore wave heights in 1953 were 7-8 m and ca. 3 m. The lower wave heights, and their short duration, in 2013 explain both localised breaching, overtopping, and back-barrier flooding associated with gravel ridges and relatively low earthen banks as well as the lack of failure in more highly-engineered coastal defences. On barrier coasts and within estuaries, the signal of maximum runup was highly variable, reflecting the modification of the tide-surge-wave signal by inshore bathymetry and the presence of a range of coastal ecosystems. The landscape impacts of the December 2013 surge included the notching of soft rock cliffs and cliffline retreat; erosion of coastal dunes; and the augmentation or re-activation of barrier island washover deposits. Whilst surge event-related cliff retreat on the rapidly eroding cliffs of the Suffolk coast lay within the natural variability in inter-annual rates of retreat, the impact of the surge on upper beach/sand dune margins produced a pulse of shoreline translation landwards equivalent to about 10 years of 'normal' shoreline retreat. The study of east coast surges over the last 60 years, and the identification of significant phases of landscape change -such as periods of rapid soft rock cliff retreat and the formation of new gravel washovers on barrier islands -points to the importance of high water levels being accompanied by high wave activity. Future developments in early warning systems and evacuation planning require information on the variable impacts of such extreme events.

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“…Source: Tomczak (1996). dominant southwesterly winds and northeasterly storms (Burningham and French, 2011); inshore wave directions are more variable, between NE and SW.…”

Section: Wave Climatementioning

confidence: 99%

“…These shoals are up to 80 km in length, 7.5 km in width and typically b 5 m below mean sea level. They are separated by often 20 m deep intervening channels which link the Thames estuary to the southern North Sea basin (Burningham and French, 2011).…”

Section: Regional Settingmentioning

confidence: 99%

Southern North Sea storm surge event of 5 December 2013: Water levels, waves and coastal impacts

Spencer

Brooks

Evans

et al. 2015

Earth-Science Reviews

154

127

View full text Add to dashboard Cite

show abstract

“…Möller & Spencer (2002) recorded water depths of 0.12-0.84 m and mean (maximum) significant wave heights of 26 (86) cm at the vegetated marsh edge (2.4 m ODN) and in water depths of up to 1.95 m between September 2000 and July 2001. Current relative sea-level rise for the Dengie Peninsula is thought to be 2-3mm yr -1 (Burningham & French, 2011), which includes eustatic components alongside regional land subsidence. This, combined with local geomorphic setting and coastal ecosystems (see Spencer et al 2014) may exacerbate storm surge impacts.…”

Section: Field Sitementioning

confidence: 99%

Geotechnical Properties of Salt Marsh and Tidal Flat Substrates at Tillingham, Essex, Uk.

Brooks¹,

Möller²,

Spencer³

et al. 2018

Int. Conf. Coastal. Eng.

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Salt marshes and, to a lesser extent, tidal flats, attenuate incoming hydrodynamic energy, thus reducing flood and erosion risk in the coastal hinterland. However, marshes are declining both globally and regionally (the Northwest European region). Salt marsh resistance to incoming hydrodynamic forcing depends on marsh biological, geochemical and geotechnical properties. However, there currently exists no systematic study of marsh geotechnical properties and how these may impact both marsh edge and marsh surface erosion processes (e.g. surface removal, cliff undercutting, gravitational slumping). This has led to poor parameterization of marsh evolution models. Here, we present a systematic study of salt marsh and tidal flat geotechnical properties (shear strength, bulk density, compressibility, plasticity and particle size) at Tillingham, Essex, UK.

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“…Change in bathymetry was then computed for the period between 1931 and 2008 using a simple raster calculation. This research methodology applied is well documented in detail by Burningham and French (2011). Sources of errors in the analyses are well already established in literature.…”

Section: Bathymetric Change Analysismentioning

confidence: 99%

Seabed dynamics in a coastal embayment

Oyedotun¹

2017

IER

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This study focuses on the morphological history of the seabed adjacent to the St. Ives to Padstow Bay coastlines, southwest England. 1931 and2008 bathymetric charts covering the North Cornwall coast were examined using bathymetric change maps and transects. The results here showed that the seabed topography in this region is not static, with patterns of net sediment movement varying spatially across the seabed. Rates of erosion and deposition varied because of the seabed exposure to the diverse rates of higher waves and tidal actions. The variation relates to the relative depths at which waves feel the seabed. Waves are more sensitive at nearshore bathymetry depths less than 20m (and 3.5km offshore) than at offshore. However, the amount of energy and increasing wave height reaching the coastlines have a minor impact on sediment transport rates or morphological modification of the adjacent coastlines and estuaries but allow the erosion potentials.Keywords: bathymetry; change detection; morphodynamics; coastal processes; SWAN; wave propagation; coastal zone; volumetric seabed change; shore-normal transects. Biographical notes: Temitope D. Timothy Oyedotun is an internationally recognised environmental researcher and university tutor. For the last 12 years, he has acquired and developed academic and research interests in diverse academic and research fields -principally in water resources management, river dynamics, fluvial geomorphology, quantitative and spatial analyses, geographic information systems (GIS) and, of recent, estuarine/coastal systems morphodynamics (coastal geomorphology). Years of international academic exposures and training have developed in him a culture of discipline with an ethic of academic entrepreneurship and great scholarship performance. He heads the Research and Concept Unit of AfriGeoServ, a consultancy firm he co-founded.

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Seabed dynamics in a lage coastal embayment: 180 years of morphological change in the outer Thames estuary

Cited by 15 publications

References 19 publications

Southern North Sea storm surge event of 5 December 2013: Water levels, waves and coastal impacts

Southern North Sea storm surge event of 5 December 2013: Water levels, waves and coastal impacts

Geotechnical Properties of Salt Marsh and Tidal Flat Substrates at Tillingham, Essex, Uk.

Seabed dynamics in a coastal embayment

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