Long-term morphological change and its causes in the Mersey Estuary, NW England

Blott, Simon J.; Pye, Kenneth; Wal, Daphne van der; Neal, Adrian

doi:10.1016/j.geomorph.2006.04.008

Cited by 140 publications

(104 citation statements)

References 25 publications

(44 reference statements)

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“…10). That occurs similarly in some Irish estuaries (Cooper, 2006), the Mersey estuary (Blott et al, 2006) and other Atlantic estuaries, but in this case, the waves are refracted in the rocks located in the western estuarine mouth, generating a longshore current to the E toward the Bay.…”

Section: Dynamics On the Inner Estuary (Tidal Flats And Main Channel)mentioning

confidence: 83%

Hydrodynamic controls of morpho-sedimentary evolution in a rock-bounded wave dominated estuary. Tina Menor (N Spain)

Flor-Blanco

Flor

González

et al. 2016

Journal of Iberian Geology

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The Tina Menor estuary is a highly confined incised valley with advanced sedimentary infilling. The outstanding feature of this estuary is its longitudinal zonation, which forms four segments from the outer to the inner limit: Mouth complex, Bay, Tidal flats and Upper channel. The innermost part of the Bay and the Tidal Flats (semi-reclaimed areas) are broader estuarine zones, whereas the Mouth Complex and outermost Bay are confined by narrow rocky outcrops. This paper explains the dynamics and sedimentary distribution of a highly confined and singular estuary, detailing the fluvial-tidal controls on the variations in water mixing (QF/QT). This estuary is largely of salt wedge type and the dynamics are characterised by recording currents (speed and direction) in the water column during a tidal cycle in a spring tide; this process consists of the tidal waves propagation and their dissipation upstream hypo-synchronously and the mixing of fresh and saline waters.The morphology, dynamics and sedimentary distributions have been integrated to develop a conceptual model that demonstrates the circulation within the estuary. The sinuous geometry of the estuarine valley and the Coriolis Effect detected, play a fundamental role in determining the morphology and sedimentary distribution. Consequently, this study provides an adequate overview of this type of confined mesotidal estuary, quite common in the eastern Atlantic coast.Keywords: estuary, mesotidal, Bay of Biscay, morpho-sedimentary processes Resumen El estuario de Tina Menor es un valle encajado altamente confinado y sedimentariamente en un avanzado estado de colmatación. Se caracteriza por su zonación longitudinal en cuatro segmentos bien diferenciados desde su sector más externo hasta el límite interior: Complejo de Desembocadura, Bahía, Llanuras Mareales y Canal Superior. El interior de la Bahía y las Llanuras Mareales de carácter fangoso (zonas semi-reclamadas) son las más extensas, mientras que el Complejo de Desembocadura y la parte externa de la Bahía, están estrechamente confinadas por afloramientos rocosos. Este trabajo explica la distribución dinámica y sedimentaria de un estuario singular y altamente confinado, detallando los controles fluviales-mareales en la variación de las mezclas de agua (QF/QT). Este estuario es en gran parte del tipo de cuña salina y la dinámica fue caracterizada por las medidas de corrientes (velocidad y dirección) realizadas en la columna de agua durante un ciclo mareal en marea viva; este proceso consiste en la propagación de las ondas de marea y su disipación de aguas arriba hiposincrónicamente y la mezcla de aguas dulces y salinas.La morfología, dinámica y las distribuciones sedimentarias, se han integrado para desarrollar un modelo conceptual que demuestre la circulación dentro del estuario. La geometría sinuosa del valle estuarino y la detección del efecto de Coriolis, juegan un rol fundamental para determinar la distribución morfologica y sedimentaria. Consecuentemente, este estudio proporciona un visión adecuada de...

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Section: Dynamics On the Inner Estuary (Tidal Flats And Main Channel)mentioning

confidence: 83%

Hydrodynamic controls of morpho-sedimentary evolution in a rock-bounded wave dominated estuary. Tina Menor (N Spain)

Flor-Blanco

Flor

González

et al. 2016

Journal of Iberian Geology

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“…However, the investigation of the driving mechanisms of long-term (historical) trend of change is problematic and often speculative due to the timing of historical surveys and the tendency for temporal mismatch between this evidence base and the forcing processes (Burningham, 2008). Here, three primary forces which are known to exert significant controls on 20th century coastal dynamics (e.g., Blott et al, 2006;Oyedotun, 2016a) are: sea-level rise, climate forcing and human intervention. These other extrinsic factors are the potentials that force geomorphic instability along the coastlines of the study sites.…”

Section: Regional Wave Climate and Seabed Morphology As Driver Of Mormentioning

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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“…Az egyes folyószakaszokon több antropogén hatás is befolyásolhatja a folyó hordalékháztartását: vízgyűjtőterületek területhasználatának megváltozása (Hooke 1997, Karancsi 2006, Lóki 2006, Dávid et al 2006), gátak, víztározók létesítése (Gregory és Park 1974, Brandt 2000, Willis és Giggs 2003, továbbá a kavics-és homokbányászat a mederből (Kondolf 1997, Harvey 2007, Blott et al 2006. Ezen beavatkozások hatására megváltozhat a folyóvízi folyamatok intenzitása, illetve térbeli kiterjedése (pl.…”

Section: Bevezetés Célkitűzésekunclassified

“…A hordaléktermelés hatására az alsóbb szakaszokon újbóli hordalék-felhalmozás alakulhat ki (Harvey 2007). A folyók torkolata is jelentősen átalakulhat a változó hordalékháztartás hatására (Blott et al 2006). A tároló esetleges megszűntetésével megváltozhat a folyó esésgörbéje, az akkumulált anyagban bevágódás kezdődhet meg, melynek során teraszképződés és megindulhat (Szabó 1998).…”

Section: áBra: Gátak Hatása a Folyók Hordalékháztartásáraunclassified

“…A gátépítéshez hasonló hatások jelentkeznek: a folyó alsóbb szakaszain a hordalékhiány miatt jelentősen megnő a folyó munkavégző képessége, így ott jelentős erózió indulhat el, a folyó bevágódik, regenerálva a hordalék mennyiségét, amely az alsóbb szakaszokon akkumulálódhat (Kondolf 1997, Harvey 2007. A zátonyok fejlődése a felvízi szakaszon gátolva van, az alsóbb részeken azonban a geomorfológiai fejlődés folyamatos, esetenként gyorsul is (Blott et al 2006, Wishart et al 2008, Martín-Vide et al 2010). …”

Section: áBra: Bányászat Hatása a Hordalékháztartásraunclassified

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A morfológia és a mederanyag-egyenleg térbeli és időbeli változása a Maros síksági szakaszán

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Long-term morphological change and its causes in the Mersey Estuary, NW England

Cited by 140 publications

References 25 publications

Hydrodynamic controls of morpho-sedimentary evolution in a rock-bounded wave dominated estuary. Tina Menor (N Spain)

Hydrodynamic controls of morpho-sedimentary evolution in a rock-bounded wave dominated estuary. Tina Menor (N Spain)

Seabed dynamics in a coastal embayment

A morfológia és a mederanyag-egyenleg térbeli és időbeli változása a Maros síksági szakaszán

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