Characteristics of Shingle Beaches with Reference to Christchurch Bay, S. England

Nicholls, Robert J.; Webber, N.B.

doi:10.1061/9780872626874.143

Cited by 3 publications

(7 citation statements)

References 9 publications

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“…The 9 s peak wave period corresponded to locally generated waves. The longer period waves caused overwashing of both Chesil Beach and Hurst Spit, although the damage on this occasion was less severe than in 1979 (Nicholls and Webber, 1988).…”

Section: Energetic Swell Events In the English Channelmentioning

confidence: 72%

Identification of ‘energetic’ swell waves in a tidal strait

Palmer¹,

Nicholls²,

Wells³

et al. 2014

Continental Shelf Research

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Section: Energetic Swell Events In the English Channelmentioning

confidence: 72%

Identification of ‘energetic’ swell waves in a tidal strait

Palmer¹,

Nicholls²,

Wells³

et al. 2014

Continental Shelf Research

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“…Hurst Castle Spit (HCS) gravel barrier beach system forms the Christchurch Bay and provides protection from wave attack to an extensive area of low-lying land in the Western Solent in the south coast of the UK [5,27] (Figures 1 and 2). The Spit is approximately 2.5 km long, orientated 130 • North.…”

Section: Hurst Castle Spitmentioning

confidence: 99%

“…The Spit is mostly shingle composition, with sediment diameter varying between 6 mm and 45 mm, with the mean sediment diameter D 50 of 15 mm and D 90 of 45 mm [5,29]. It is estimated that the main body of the HCS is declining in volume by approximately 7000-8000 m 3 /yr and retreating by 3.5 m/yr on average [27]. The littoral transport rate in the nearshore region has been estimated at 11,000-13,000 m 3 per/yr [30].…”

Section: Hurst Castle Spitmentioning

confidence: 99%

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Gravel Barrier Beach Morphodynamic Response to Extreme Conditions

Ions

Karunarathna

Reeve

et al. 2021

JMSE

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Gravel beaches and barriers form a valuable natural protection for many shorelines. The paper presents a numerical modelling study of gravel barrier beach response to storm wave conditions. The XBeach non-hydrostatic model was set up in 1D mode to investigate barrier volume change and overwash under a wide range of unimodal and bimodal storm conditions and barrier cross sections. The numerical model was validated against conditions at Hurst Castle Spit, UK. The validated model is used to simulate the response of a range of gravel barrier cross sections under a wide selection of statistically significant storm wave and water level scenarios thus simulating an ensemble of barrier volume change and overwash. This ensemble of results was used to develop a simple parametric model for estimating barrier volume change during a given storm and water level condition under unimodal storm conditions. Numerical simulations of barrier response to bimodal storm conditions, which are a common occurrence in many parts of the UK were also investigated. It was found that barrier volume change and overwash from bimodal storms will be higher than that from unimodal storms if the swell percentage in the bimodal spectrum is greater than 40%. The model is demonstrated as providing a useful tool for estimating barrier volume change, a commonly used measure used in gravel barrier beach management.

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“…However, it is possible to estimate the updraught magnitude, w*. For an aircraft in straight and level flight, the major terms in the vertical component of the gust equations (Nicholls 1980) give…”

Section: (B) Aircrafimentioning

confidence: 99%

Evaluation of key microphysical parameters in three‐dimensional cloud‐model simulations using aircraft and multiparameter radar data

Brown

Swann

1997

Quart J Royal Meteoro Soc

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A 3-d numerical model is being used for the development of improved parametrizations of convective transport processes in climate and numerical weather-prediction models. In common with similar cloud-resolving models, it uses a 3-phase bulk-water parametrization of the microphysical processes. The comparison of results from such models with observed case-studies represents an important step in their development and a key activity of the Global Energy and Water Cycle Experiment Cloud System Study.This paper presents observations and model results from the case of a weakly convective precipitating cloud that occurred on 22 June 1990 over central southern England. The cloud was observed by both an instrumented research aircraft and a dual-polarization radar. The combination of these measurements provides information on the dominant precipitation particle types, their density, number concentration, and characteristic size, and enables the identification of key microphysical processes. The observations were used to provide guidance on the numerical values of some of the variable parameters in the microphysics scheme. Observed values of No,G, the intercept parameter for graupel, lay in the range lo4 to lo7 m-4. The comparison of observed radar reflectivities with those calculated from in situ particle size spectra suggests that the density of rimed precipitation particles decreased from around 0.5 g cm-3 in the most intense precipitation to around 0.1 g A number of model sensitivity studies were performed to examine the impact of changes in these parameters on the model cloud and precipitation fields. For this case-study, it was found that the total surface precipitation was generally insensitive to such changes, varying by less than 10%. Reductions of 35% occurred for model tuns in which the graupel fall speed was reduced and for a model run with only 'warm-rain' microphysics. Much larger variations in the range 50-100% occurred in the total cloud ice and snow contents.The modelling study identifies a number of differences between runs which could not be resolved owing to the lack of in situ data in certain regions of the cloud. Some of the requirements for improved observational methods and procedures are discussed.towards the cloud edges.

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Characteristics of Shingle Beaches with Reference to Christchurch Bay, S. England

Cited by 3 publications

References 9 publications

Identification of ‘energetic’ swell waves in a tidal strait

Identification of ‘energetic’ swell waves in a tidal strait

Gravel Barrier Beach Morphodynamic Response to Extreme Conditions

Evaluation of key microphysical parameters in three‐dimensional cloud‐model simulations using aircraft and multiparameter radar data

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