| Abstract: | Small-scale (< 5 m horizontal length) nearshore morphologic height variations were measured by combining CRAB surveys with bed elevations acquired with a 1 MHz sonic altimeter mounted on the CRAB during the October Phase of the DUCK94 experiment. Bedform plan views were recorded simultaneously using a 500 kHz side-scan sonar mounted on the CRAB. Waves and currents were measured at the same time. Significant temporal and spatial variations in the small-scale morphology were measured in response to changing waves and currents during the 2 weeks examined. Three cases are examined in detail: (1) mild waves and weak longshore currents resulting in wave ripples throughout the study area; (2) storm waves with strong longshore currents resulting in lunate and straight-crested mega-ripples in the trough of the barred beach; and (3) narrow-band, normally incident waves with a strong rip current resulting in a planar bed except in the throat of the rip where mega-ripples were measured. Wavenumber spectra of the bed were generally broad, indicating newly formed ripples coexisted with residual ripples from the past to form complex, multi-scaled ripple patterns. |
| Genre: | Article |
| ProdID: | 70020735 |
| Citation Author: | Thornton, E. B.; Swayne, J. L.; Dingler, J. R. |
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| Citation End Page: | 196 |
| Citation Issue: | 3-4 |
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| Citation Language: | English |
| Citation Larger Work Title: | Marine Geology |
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| Citation Number Of Pages: | 24 |
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| Citation Search Results Text: | Small-scale morphology across the surf zone; 1998; Article; Journal; Marine Geology; Thornton, E. B.; Swayne, J. L.; Dingler, J. R. |
| Citation Start Page: | 173 |
| Citation Volume: | 145 |
| Citation Year: | 1998 |
| Type: | citation/reference |
| Text: | Small-scale morphology across the surf zone; 1998; Article; Journal; Marine Geology; Thornton, E. B.; Swayne, J. L.; Dingler, J. R. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1016/S0025-3227(97)00114-X |
| Date Other: | Thu, 1 Jan 1998 00:00 -0600 |
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