Morphology, sedimentary bedforms and sand transport across a ridge- and- runnel beach under the action of summer waves

Christopher E. Vincent; Robert C. Kay; Chen Chenghui; Li Li; Jack Jarvis

doi:10.1007/BF02849659

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Morphology, sedimentary bedforms and sand transport across a ridge- and- runnel beach under the action of summer waves

Updated：2023-05-16

- Morphology, sedimentary bedforms and sand transport across a ridge- and- runnel beach under the action of summer waves
- Journal of Oceanology and Limnology Vol. 8, Issue 3, Pages: 197-212(1990)
- Affiliations：
  
  1. School of Environmental Sciences
  2. 3rd Institute of Oceanography SOA
  3. Department of Geography
- Author bio：
- Funds：
- DOI：10.1007/BF02849659
  CLC：
- Published：1990
- Accepted：
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Vincent, C.E., Kay, R.C., Chenghui, C. et al. Morphology, sedimentary bedforms and sand transport across a ridge- and- runnel beach under the action of summer waves., Chin. J. Ocean. Limnol. 8, 197–212 (1990). https://doi.org/10.1007/BF02849659
DOI：

Vincent, C.E., Kay, R.C., Chenghui, C. et al. Morphology, sedimentary bedforms and sand transport across a ridge- and- runnel beach under the action of summer waves., Chin. J. Ocean. Limnol. 8, 197–212 (1990). https://doi.org/10.1007/BF02849659 DOI：

摘要

Abstract

As part of a collaborative study between the 3rd Institute of Oceanography

Xiamen

and the U. K. Universities of East Anglia and St. Andrews

a 4-day experiment was conducted on a ridge- and- runnel beach of north Norfolk on the North Sea coast. Detailed surveys were made of every low water of an area 10m by 30m and electromagnetic current meters were used to measure wave-induced currents over the ridge and in the runnel. The locations of bedform fields were noted

fluorescent sand was used to follow the sand movement and

at the end of the experiment

lacquer peels were taken of the top 0.2m of a vertical section through the ridge- and- runnel. During the 4 days 0.75m3 of sand per metre width of beach accreted in the runnel and a similar volume was eroded from the upper foreshore. The dominant shoreward transport

identified qualitatively by the movement of the fluorescent sand

suggests the ridge- and- runnel system migrated shorewards up the general beach slope of 1o by 2–3m. The wave orbital currents were used to predict the bedforms to be expected over the tidal cycle: an upper phase plane- bed was predicted for most of the period but vortex and rolling- grain ripples were predicted and observed when the water level over the ridge was low. As the tide dropped ripples on the ridge were eliminated by swash action but the ripples in the runnel were protected by the ridge and remained on the beach after the tide dropped. The observed accretion of the beach in the runnel and on the lee slope of the ridge was used to calculate that a net average shoreward transport of 0.11g/cm·s−1 occurred over the ridge crest during the period it was underwater. The current meter measurements of the wave orbital currents and the mean currents over the ridge crest were used with the wave- current interaction model of Grant and Madsen (1982)

ripple dimensions defined by Nielsen (1981)

and resuspension coefficient of Vincent and Green (1990)

to compute bedload sand transport rates from the equations of Madsen and Grant (1976)

Sleath (1978)

and Vincent et al. (1981)

and also the suspended sand transport rates. The results from one of these bedload equations (Madsen and Grant

1976) compared well with the observed net transport. The calculated suspended load transport rates (due to steady currents alone) were a factor of 5 too great

and were also several orders of magnitude greater than suspended transport rates measured directly under similar or more energetic wave and current conditions.

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references

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