From Ripples to Large-Scale Sand Transport: The Effects of Bedform-Related Roughness on Hydrodynamics and Sediment Transport Patterns in Delft3D
Bedform-related roughness affects both water movement and sediment transport, so it is important that it is represented correctly in numerical morphodynamic models. The main objective of the present study is to quantify for the first time the importance of ripple- and megaripple-related roughness fo...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-11-01
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| Series: | Journal of Marine Science and Engineering |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2077-1312/8/11/892 |
| _version_ | 1797548497099030528 |
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| author | Laura Brakenhoff Reinier Schrijvershof Jebbe van der Werf Bart Grasmeijer Gerben Ruessink Maarten van der Vegt |
| author_facet | Laura Brakenhoff Reinier Schrijvershof Jebbe van der Werf Bart Grasmeijer Gerben Ruessink Maarten van der Vegt |
| author_sort | Laura Brakenhoff |
| collection | DOAJ |
| description | Bedform-related roughness affects both water movement and sediment transport, so it is important that it is represented correctly in numerical morphodynamic models. The main objective of the present study is to quantify for the first time the importance of ripple- and megaripple-related roughness for modelled hydrodynamics and sediment transport on the wave- and tide-dominated Ameland ebb-tidal delta in the north of the Netherlands. To do so, a sensitivity analysis was performed, in which several types of bedform-related roughness predictors were evaluated using a Delft3D model. Also, modelled ripple roughness was compared to data of ripple heights observed in a six-week field campaign on the Ameland ebb-tidal delta. The present study improves our understanding of how choices in model set-up influence model results. By comparing the results of the model scenarios, it was found that the ripple and megaripple-related roughness affect the depth-averaged current velocity, mainly over the shallow areas of the delta. The small-scale ripples are also important for the suspended load sediment transport, both indirectly through the affected flow and directly. While the current magnitude changes by 10–20% through changes in bedform roughness, the sediment transport magnitude changes by more than 100%. |
| first_indexed | 2024-03-10T15:01:31Z |
| format | Article |
| id | doaj.art-d7018d5edd2f44eebc591ef38fb1c1c3 |
| institution | Directory Open Access Journal |
| issn | 2077-1312 |
| language | English |
| last_indexed | 2024-03-10T15:01:31Z |
| publishDate | 2020-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Journal of Marine Science and Engineering |
| spelling | doaj.art-d7018d5edd2f44eebc591ef38fb1c1c32023-11-20T20:13:05ZengMDPI AGJournal of Marine Science and Engineering2077-13122020-11-0181189210.3390/jmse8110892From Ripples to Large-Scale Sand Transport: The Effects of Bedform-Related Roughness on Hydrodynamics and Sediment Transport Patterns in Delft3DLaura Brakenhoff0Reinier Schrijvershof1Jebbe van der Werf2Bart Grasmeijer3Gerben Ruessink4Maarten van der Vegt5Department of Physical Geography, Faculty of Geosciences, Utrecht University, Princetonlaan 8a, 3584 CB Utrecht, The NetherlandsDepartment of Marine and Coastal Systems, Deltares, P.O. Box 177, 2600 MH Delft, The NetherlandsDepartment of Marine and Coastal Systems, Deltares, P.O. Box 177, 2600 MH Delft, The NetherlandsDepartment of Marine and Coastal Systems, Deltares, P.O. Box 177, 2600 MH Delft, The NetherlandsDepartment of Physical Geography, Faculty of Geosciences, Utrecht University, Princetonlaan 8a, 3584 CB Utrecht, The NetherlandsDepartment of Physical Geography, Faculty of Geosciences, Utrecht University, Princetonlaan 8a, 3584 CB Utrecht, The NetherlandsBedform-related roughness affects both water movement and sediment transport, so it is important that it is represented correctly in numerical morphodynamic models. The main objective of the present study is to quantify for the first time the importance of ripple- and megaripple-related roughness for modelled hydrodynamics and sediment transport on the wave- and tide-dominated Ameland ebb-tidal delta in the north of the Netherlands. To do so, a sensitivity analysis was performed, in which several types of bedform-related roughness predictors were evaluated using a Delft3D model. Also, modelled ripple roughness was compared to data of ripple heights observed in a six-week field campaign on the Ameland ebb-tidal delta. The present study improves our understanding of how choices in model set-up influence model results. By comparing the results of the model scenarios, it was found that the ripple and megaripple-related roughness affect the depth-averaged current velocity, mainly over the shallow areas of the delta. The small-scale ripples are also important for the suspended load sediment transport, both indirectly through the affected flow and directly. While the current magnitude changes by 10–20% through changes in bedform roughness, the sediment transport magnitude changes by more than 100%.https://www.mdpi.com/2077-1312/8/11/892Delft3Dbedform predictorshydrodynamicssediment transportbed roughness |
| spellingShingle | Laura Brakenhoff Reinier Schrijvershof Jebbe van der Werf Bart Grasmeijer Gerben Ruessink Maarten van der Vegt From Ripples to Large-Scale Sand Transport: The Effects of Bedform-Related Roughness on Hydrodynamics and Sediment Transport Patterns in Delft3D Journal of Marine Science and Engineering Delft3D bedform predictors hydrodynamics sediment transport bed roughness |
| title | From Ripples to Large-Scale Sand Transport: The Effects of Bedform-Related Roughness on Hydrodynamics and Sediment Transport Patterns in Delft3D |
| title_full | From Ripples to Large-Scale Sand Transport: The Effects of Bedform-Related Roughness on Hydrodynamics and Sediment Transport Patterns in Delft3D |
| title_fullStr | From Ripples to Large-Scale Sand Transport: The Effects of Bedform-Related Roughness on Hydrodynamics and Sediment Transport Patterns in Delft3D |
| title_full_unstemmed | From Ripples to Large-Scale Sand Transport: The Effects of Bedform-Related Roughness on Hydrodynamics and Sediment Transport Patterns in Delft3D |
| title_short | From Ripples to Large-Scale Sand Transport: The Effects of Bedform-Related Roughness on Hydrodynamics and Sediment Transport Patterns in Delft3D |
| title_sort | from ripples to large scale sand transport the effects of bedform related roughness on hydrodynamics and sediment transport patterns in delft3d |
| topic | Delft3D bedform predictors hydrodynamics sediment transport bed roughness |
| url | https://www.mdpi.com/2077-1312/8/11/892 |
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