5-7-2014 Challenge the future Delft University of Technology Dune erosion during storm surges Jaap...
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![Page 1: 5-7-2014 Challenge the future Delft University of Technology Dune erosion during storm surges Jaap van Thiel de Vries Picture: Beach and dunes near Westenshouwen.](https://reader036.fdocuments.us/reader036/viewer/2022062417/551a6cc2550346545e8b5f53/html5/thumbnails/1.jpg)
11-04-23
Challenge the future
DelftUniversity ofTechnology
Dune erosion during storm surgesJaap van Thiel de Vries
Picture: Beach and dunes near Westenshouwen
![Page 2: 5-7-2014 Challenge the future Delft University of Technology Dune erosion during storm surges Jaap van Thiel de Vries Picture: Beach and dunes near Westenshouwen.](https://reader036.fdocuments.us/reader036/viewer/2022062417/551a6cc2550346545e8b5f53/html5/thumbnails/2.jpg)
2Titel van de presentatie
Dune erosion
Maximum storm surge level
Pre-surge dune foot
Post-surge dune foot
Pre-surge beach width
Post-surge beach width
Mean sea level
Dune erosion during storm surges
![Page 3: 5-7-2014 Challenge the future Delft University of Technology Dune erosion during storm surges Jaap van Thiel de Vries Picture: Beach and dunes near Westenshouwen.](https://reader036.fdocuments.us/reader036/viewer/2022062417/551a6cc2550346545e8b5f53/html5/thumbnails/3.jpg)
3Titel van de presentatie
Societal importance
Dutch safety policy against flooding:
•“Dijkringen”
•Weakest link in a “dijkring” determines safety against flooding
•Strength primary water defenses against normative conditions is assessed every five years.
•Strength dunes is assessed with empirical guideline elaborated from large scale dune erosion experiments
Dune erosion during storm surges
![Page 4: 5-7-2014 Challenge the future Delft University of Technology Dune erosion during storm surges Jaap van Thiel de Vries Picture: Beach and dunes near Westenshouwen.](https://reader036.fdocuments.us/reader036/viewer/2022062417/551a6cc2550346545e8b5f53/html5/thumbnails/4.jpg)
4Titel van de presentatie
Societal importanceHondsbosche en Pettemer sea defense Scheveningen
Head of Noord-Holland Head of Walcheren
Dune erosion during storm surges
![Page 5: 5-7-2014 Challenge the future Delft University of Technology Dune erosion during storm surges Jaap van Thiel de Vries Picture: Beach and dunes near Westenshouwen.](https://reader036.fdocuments.us/reader036/viewer/2022062417/551a6cc2550346545e8b5f53/html5/thumbnails/5.jpg)
5Titel van de presentatie
Thesis outline
Thesis outline:• Large scale dune erosion tests in the Deltaflume• Interaction of dune and swash• New approach in modeling near dune hydrodynamics• New approach in modeling near dune sediment
concentrations• Coupling of new physical insights in a 2DH
morphodynamic model
Objective: Improve our physical understanding of dune erosion in order to develop a more generic dune erosion model.
Dune erosion during storm surges
![Page 6: 5-7-2014 Challenge the future Delft University of Technology Dune erosion during storm surges Jaap van Thiel de Vries Picture: Beach and dunes near Westenshouwen.](https://reader036.fdocuments.us/reader036/viewer/2022062417/551a6cc2550346545e8b5f53/html5/thumbnails/6.jpg)
6Titel van de presentatie
Deltaflume experimentDimensions: 220m x 5m x 7m
Depth scale = 6
Irregular waves; Hm0=1.5m
Dune erosion during storm surges
![Page 7: 5-7-2014 Challenge the future Delft University of Technology Dune erosion during storm surges Jaap van Thiel de Vries Picture: Beach and dunes near Westenshouwen.](https://reader036.fdocuments.us/reader036/viewer/2022062417/551a6cc2550346545e8b5f53/html5/thumbnails/7.jpg)
7Titel van de presentatie
Deltaflume measurements
In-situ
Stereo Video
Dune erosion during storm surges
MOBILE FRAME
STEREO VIDEO
FLUME WALL
![Page 8: 5-7-2014 Challenge the future Delft University of Technology Dune erosion during storm surges Jaap van Thiel de Vries Picture: Beach and dunes near Westenshouwen.](https://reader036.fdocuments.us/reader036/viewer/2022062417/551a6cc2550346545e8b5f53/html5/thumbnails/8.jpg)
8Titel van de presentatie
Deltaflume results
Pressure sensors on flume wall: Suction tubes on shallow water frame:
Dune erosion during storm surges
duingolfschot
Korte (wind) golvenLange golven
![Page 9: 5-7-2014 Challenge the future Delft University of Technology Dune erosion during storm surges Jaap van Thiel de Vries Picture: Beach and dunes near Westenshouwen.](https://reader036.fdocuments.us/reader036/viewer/2022062417/551a6cc2550346545e8b5f53/html5/thumbnails/9.jpg)
9Titel van de presentatie
Deltaflume results
Incoming bore
Shore line
Reflected wave
Dune crest
Dune erosion during storm surges
![Page 10: 5-7-2014 Challenge the future Delft University of Technology Dune erosion during storm surges Jaap van Thiel de Vries Picture: Beach and dunes near Westenshouwen.](https://reader036.fdocuments.us/reader036/viewer/2022062417/551a6cc2550346545e8b5f53/html5/thumbnails/10.jpg)
10Titel van de presentatieDune erosion during storm surges
Modeling near dune hydrodynamics
The generation of long waves due to variations in the wind generated short waves
![Page 11: 5-7-2014 Challenge the future Delft University of Technology Dune erosion during storm surges Jaap van Thiel de Vries Picture: Beach and dunes near Westenshouwen.](https://reader036.fdocuments.us/reader036/viewer/2022062417/551a6cc2550346545e8b5f53/html5/thumbnails/11.jpg)
11Titel van de presentatieDune erosion during storm surges
Modeling near dune hydrodynamics
![Page 12: 5-7-2014 Challenge the future Delft University of Technology Dune erosion during storm surges Jaap van Thiel de Vries Picture: Beach and dunes near Westenshouwen.](https://reader036.fdocuments.us/reader036/viewer/2022062417/551a6cc2550346545e8b5f53/html5/thumbnails/12.jpg)
12Titel van de presentatieDune erosion during storm surges
Modeling near dune hydrodynamics
![Page 13: 5-7-2014 Challenge the future Delft University of Technology Dune erosion during storm surges Jaap van Thiel de Vries Picture: Beach and dunes near Westenshouwen.](https://reader036.fdocuments.us/reader036/viewer/2022062417/551a6cc2550346545e8b5f53/html5/thumbnails/13.jpg)
13Titel van de presentatieDune erosion during storm surges
Near dune sediment concentrations
Tbore
Hypthesis: High near dune sediment concentrations are caused by wave breaking induced turbulence that is injected in the water column over a short time interval and reaches the bed as a pulse.
![Page 14: 5-7-2014 Challenge the future Delft University of Technology Dune erosion during storm surges Jaap van Thiel de Vries Picture: Beach and dunes near Westenshouwen.](https://reader036.fdocuments.us/reader036/viewer/2022062417/551a6cc2550346545e8b5f53/html5/thumbnails/14.jpg)
14Titel van de presentatieDune erosion during storm surges
Near dune sediment concentrations
![Page 15: 5-7-2014 Challenge the future Delft University of Technology Dune erosion during storm surges Jaap van Thiel de Vries Picture: Beach and dunes near Westenshouwen.](https://reader036.fdocuments.us/reader036/viewer/2022062417/551a6cc2550346545e8b5f53/html5/thumbnails/15.jpg)
15Titel van de presentatieDune erosion during storm surges
XBeachNew physical insights are coupled in the morphodynamic model XBeach that:
• Solves both short waves (energy balance) and long waves (Nonlinear Shallow Water Equations);
• Includes a formulation that also relates the sediment concentration to the wave breaking induced turbulence pulses that potentially reach the bed;
• Includes the longshore direction.
![Page 16: 5-7-2014 Challenge the future Delft University of Technology Dune erosion during storm surges Jaap van Thiel de Vries Picture: Beach and dunes near Westenshouwen.](https://reader036.fdocuments.us/reader036/viewer/2022062417/551a6cc2550346545e8b5f53/html5/thumbnails/16.jpg)
16Titel van de presentatieDune erosion during storm surges
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