Print Email Facebook Twitter Navigating Sand and Waves Title Navigating Sand and Waves: On the evolution of sand ripples under combined wave and current conditions Author Schmidt, Anneliese (TU Delft Civil Engineering and Geosciences) Contributor de Schipper, Matthieu (mentor) Hopkins, Julia (mentor) Degree granting institution Delft University of Technology Programme Civil Engineering | Hydraulic Engineering Date 2020-01-31 Abstract Sand ripples are small (10 cm height) bed forms which occur in the nearshore and surf zone under the impact of both waves and currents. They impact the roughness of the bed used in models of this zone, and contribute to sediment transport. Predictions of their geometry are important to properly model roughness, so correlations between the waves and ripples need to be established. In this project, data about the instantaneous bed level and wave conditions at two point locations in the surf zone was used to analyze the relationship between wave conditions and ripples on the bed. Values for significant wave height, peak period, skewness, ripple height and ripple period were found over bins of 15 minutes in length. It was found that there are relationships between ripple height and wave height, wave skewness and ripple height. These correlations are strongest for a zero shift in the signals, meaning the ripple height can adjust to the wave height and/or skewness within 15 minutes. These results can be used with further research, which includes local current measurements, to make more accurate estimates of the ripple height. Subject ripplesSand Enginewaves To reference this document use: http://resolver.tudelft.nl/uuid:9431ee3f-0eca-476d-b133-a749589b78e0 Coordinates 52.056456, 4.183488 Part of collection Student theses Document type master thesis Rights © 2020 Anneliese Schmidt Files PDF AKSchmidt_AdditionalThesi ... _Final.pdf 3.81 MB Close viewer /islandora/object/uuid:9431ee3f-0eca-476d-b133-a749589b78e0/datastream/OBJ/view