Krämer, Knut; Winter, Christian (2016): In situ measurements of ripple dimensions. PANGAEA, https://doi.org/10.1594/PANGAEA.868606, Supplement to: Krämer, K; Winter, C (2016): Predicted ripple dimensions in relation to the precision of in situ measurements in the southern North Sea. Ocean Science, 12(6), 1221-1235, https://doi.org/10.5194/os-12-1221-2016
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Ripples are common morphological features in sandy marine environments. Their shapes and dimensions are closely related to local sediment properties and the 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, situ measurements of ripple dimensions and their dynamics in a shallow shelf sea are reported. Technical and methodological limits of the detection of ripple dimensions and their dynamic evolution due to changing forcing are assessed. Methods of bed detection from sonar data and analysis of ripple dimensions in digital elevation models (DEM) are compared and evaluated. The range of measured ripple dimensions is quantified and compared to results of traditional and recent empirical predictors. The precision of measurements of bedform dimensions is taken as the repeatability of a measurement for inactive conditions and the accuracy of measurement is assessed via comparison to predicted dimensions. The precision of detection is limited to 10 % of the absolute ripple dimensions. The order of magnitude of the ripple dimension can be predicted by the empirical relations. However, these tend to return the height of the largest ripples rather than average heights. The application of different methods for detection of heights may result in derived form roughness heights by up to a factor of two.
Median Latitude: 53.985728 * Median Longitude: 7.596562 * South-bound Latitude: 53.563960 * West-bound Longitude: 7.358670 * North-bound Latitude: 54.091170 * East-bound Longitude: 8.548130
Date/Time Start: 2015-03-20T00:00:00 * Date/Time End: 2015-03-30T05:23:00
Datasets listed in this publication series
- Krämer, K; Winter, C (2016): Flow velocity magnitude from ADV 0.12 m above seabed at station HE441/07-1 from the German Bight. https://doi.org/10.1594/PANGAEA.868599
- Krämer, K; Winter, C (2016): Gridded small-scale bathymetry of RV Heincke cruise HE441 from the German Bight. https://doi.org/10.1594/PANGAEA.868600
- Krämer, K; Winter, C (2016): Significant wave height and peak period at station HE441/07-1 from the German Bight. https://doi.org/10.1594/PANGAEA.868604
- Krämer, K; Winter, C (2016): Water level from CTD pressure sensor 2 m above seabed at station HE441/07-1 from the German Bight. https://doi.org/10.1594/PANGAEA.868602
- Krämer, K; Winter, C (2016): Wind speed and direction from shipboard weather station at Heincke cruise HE441/1 from the German Bight. https://doi.org/10.1594/PANGAEA.868605