Predicted ripple dimensions in relation to the precision of in situ measurements in the southern North Sea
Ripples are common morphological features in sandy marine environments. Their shapes and dimensions are closely related to local sediment properties and forcing by waves and currents. Numerous predictors for the geometry and hydraulic roughness of ripples exist but, due to their empirical nature, th...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2016-11-01
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| Series: | Ocean Science |
| Online Access: | http://www.ocean-sci.net/12/1221/2016/os-12-1221-2016.pdf |
| _version_ | 1798046205014441984 |
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| author | K. Krämer C. Winter |
| author_facet | K. Krämer C. Winter |
| author_sort | K. Krämer |
| collection | DOAJ |
| description | Ripples are common morphological features in sandy marine environments. Their
shapes and dimensions are closely related to local sediment properties and
forcing by waves and currents. Numerous predictors for the geometry and
hydraulic roughness of ripples exist but, due to their empirical nature, they
may fail to properly reflect conditions in the field. Here, measurements of
tide and wave generated ripples in a shallow shelf sea are reported. Discrete
and continuous methods for the extraction of ripple dimensions from digital
elevation models (DEMs) are inter-compared. The range of measured ripple
dimensions is quantified and compared to the results of empirical predictors.
<br><br>
The repeatability of a measurement for inactive conditions is taken as the
<i>precision</i> of measurements of bedform dimensions. The
<i>accuracy</i> of measurement is assessed via comparison to predicted
dimensions. Results from field data show that the precision of measurements
is limited to 10 % of the absolute ripple dimensions. The application of
different methods for the detection of ripple heights may result in form
roughness heights differing by a factor of up to 2 between the traditional
statistical estimate and a full evaluation of the spatial bathymetry. |
| first_indexed | 2024-04-11T23:33:44Z |
| format | Article |
| id | doaj.art-af4ee00bd33e4d0eb4a8fa0e458f300e |
| institution | Directory Open Access Journal |
| issn | 1812-0784 1812-0792 |
| language | English |
| last_indexed | 2024-04-11T23:33:44Z |
| publishDate | 2016-11-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Ocean Science |
| spelling | doaj.art-af4ee00bd33e4d0eb4a8fa0e458f300e2022-12-22T03:57:00ZengCopernicus PublicationsOcean Science1812-07841812-07922016-11-011261221123510.5194/os-12-1221-2016Predicted ripple dimensions in relation to the precision of in situ measurements in the southern North SeaK. Krämer0C. Winter1MARUM – Center for Marine Environmental Sciences, University of Bremen, Leobener Str., 28359 Bremen, GermanyMARUM – Center for Marine Environmental Sciences, University of Bremen, Leobener Str., 28359 Bremen, GermanyRipples are common morphological features in sandy marine environments. Their shapes and dimensions are closely related to local sediment properties and forcing by waves and currents. Numerous predictors for the geometry and hydraulic roughness of ripples exist but, due to their empirical nature, they may fail to properly reflect conditions in the field. Here, measurements of tide and wave generated ripples in a shallow shelf sea are reported. Discrete and continuous methods for the extraction of ripple dimensions from digital elevation models (DEMs) are inter-compared. The range of measured ripple dimensions is quantified and compared to the results of empirical predictors. <br><br> The repeatability of a measurement for inactive conditions is taken as the <i>precision</i> of measurements of bedform dimensions. The <i>accuracy</i> of measurement is assessed via comparison to predicted dimensions. Results from field data show that the precision of measurements is limited to 10 % of the absolute ripple dimensions. The application of different methods for the detection of ripple heights may result in form roughness heights differing by a factor of up to 2 between the traditional statistical estimate and a full evaluation of the spatial bathymetry.http://www.ocean-sci.net/12/1221/2016/os-12-1221-2016.pdf |
| spellingShingle | K. Krämer C. Winter Predicted ripple dimensions in relation to the precision of in situ measurements in the southern North Sea Ocean Science |
| title | Predicted ripple dimensions in relation to the precision of in situ measurements in the southern North Sea |
| title_full | Predicted ripple dimensions in relation to the precision of in situ measurements in the southern North Sea |
| title_fullStr | Predicted ripple dimensions in relation to the precision of in situ measurements in the southern North Sea |
| title_full_unstemmed | Predicted ripple dimensions in relation to the precision of in situ measurements in the southern North Sea |
| title_short | Predicted ripple dimensions in relation to the precision of in situ measurements in the southern North Sea |
| title_sort | predicted ripple dimensions in relation to the precision of in situ measurements in the southern north sea |
| url | http://www.ocean-sci.net/12/1221/2016/os-12-1221-2016.pdf |
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