Biogeomorphology: interactions between benthos and sediment dynamics University of Twente, Enschede,...
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Transcript of Biogeomorphology: interactions between benthos and sediment dynamics University of Twente, Enschede,...
![Page 1: Biogeomorphology: interactions between benthos and sediment dynamics University of Twente, Enschede, The Netherlands Deltares, Delft, The Netherlands Bas.](https://reader036.fdocuments.in/reader036/viewer/2022062315/5697c0031a28abf838cc3d8b/html5/thumbnails/1.jpg)
Biogeomorphology: interactions between benthos and sediment dynamics
University of Twente, Enschede, The NetherlandsDeltares, Delft, The Netherlands
Bas Borsje
![Page 2: Biogeomorphology: interactions between benthos and sediment dynamics University of Twente, Enschede, The Netherlands Deltares, Delft, The Netherlands Bas.](https://reader036.fdocuments.in/reader036/viewer/2022062315/5697c0031a28abf838cc3d8b/html5/thumbnails/2.jpg)
Introduction
• Bio-geomorphology: interaction between benthos, water and sand
• Studying bio-geomorphodynamics offshore is important from an:• Ecological perspective (conservation of biodiversity)• Economic perspective (utilization of the seabed)
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![Page 3: Biogeomorphology: interactions between benthos and sediment dynamics University of Twente, Enschede, The Netherlands Deltares, Delft, The Netherlands Bas.](https://reader036.fdocuments.in/reader036/viewer/2022062315/5697c0031a28abf838cc3d8b/html5/thumbnails/3.jpg)
Biogeomorphological processes
• destabilising the top layer of the sediment by crawling• filtering the fine sediment out of the water collumn• stabilising the top layer of the sediment by covering • adding roughness to the bottom• redistributing the sediment
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![Page 4: Biogeomorphology: interactions between benthos and sediment dynamics University of Twente, Enschede, The Netherlands Deltares, Delft, The Netherlands Bas.](https://reader036.fdocuments.in/reader036/viewer/2022062315/5697c0031a28abf838cc3d8b/html5/thumbnails/4.jpg)
Field observations
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![Page 5: Biogeomorphology: interactions between benthos and sediment dynamics University of Twente, Enschede, The Netherlands Deltares, Delft, The Netherlands Bas.](https://reader036.fdocuments.in/reader036/viewer/2022062315/5697c0031a28abf838cc3d8b/html5/thumbnails/5.jpg)
Field observations
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![Page 6: Biogeomorphology: interactions between benthos and sediment dynamics University of Twente, Enschede, The Netherlands Deltares, Delft, The Netherlands Bas.](https://reader036.fdocuments.in/reader036/viewer/2022062315/5697c0031a28abf838cc3d8b/html5/thumbnails/6.jpg)
Modelling
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Validation
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• Lower near bed velocity → Lower ripples (direct) → Deposition of fine sediment → Lower ripples (indirect)
![Page 8: Biogeomorphology: interactions between benthos and sediment dynamics University of Twente, Enschede, The Netherlands Deltares, Delft, The Netherlands Bas.](https://reader036.fdocuments.in/reader036/viewer/2022062315/5697c0031a28abf838cc3d8b/html5/thumbnails/8.jpg)
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Biogeomorphological interactions
![Page 9: Biogeomorphology: interactions between benthos and sediment dynamics University of Twente, Enschede, The Netherlands Deltares, Delft, The Netherlands Bas.](https://reader036.fdocuments.in/reader036/viewer/2022062315/5697c0031a28abf838cc3d8b/html5/thumbnails/9.jpg)
Discussion
• Biota are able to influence the shape of the seabed• The shape of the seabed is linked to the species habitat• Understanding the coupled system is important• Anthropogenic pressure will both influence sediment
dynamics and biota directly and indirectly• Windfarms• Nourishments• Dredging activities
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Conclusions
• Biological and physical processes show a dynamic interaction
• Importance to account for bio-geomorphological interactions offshore
Contact:[email protected]
Bas Borsje