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Workshop research and monitoring

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Dynamic Dunes Congress 2015
Workshop: Research and monitoring - Bas Arens

Published in: Environment
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Workshop research and monitoring

  1. 1. Monitoring dynamic dunes state of the art geomorphology
  2. 2. White dunes
  3. 3. Grey dunes
  4. 4. Grey dunes Grey dunes
  5. 5. What to measure? interest parameter Sand transport (process) Events Gradients Sand transport (result) Height changes: deflation, accumulation Sediment budget Landscape dynamics Areas bare sand, colonized, sand burial Geomorphic features Blowouts, Carves, mobile dunes, dune building
  6. 6. Measuring landscape form Method Accuracy Reliability Costs Advantage Disadvantage Air photographs +/- High High Retrospective Expensive Problems with data gathering Recording date Field mapping +/- Medium- high Medium-high Recording date
  7. 7. • Air photo – Bare-vegetated – Shapes – Evolution in time
  8. 8. • Landscape dynamics
  9. 9. Measuring Process sand transport indirectly Method Accuracy Reliability Costs Advantage Disadvantage Erosion pins + Low Low Easy, 1D Risk for data loss 1D Augering +/- High Low Easy, 1D Retrospective Accuracy? Profile GPS ++ High Medium Easy, 2D 2D Lidar +/- High High 3D Accuracy Photogram. Drone +/- high Medium-high 3D No data in vegetation
  10. 10. • Erosion pins – Spot measurements – Risk of data loss -10 -5 0 5 10 1-1 1-2 1-3 1-4 1-5 1-6 1-7 1-8 1-9 heightchange(cm) pin number Kraansvlak transect 1 24/9 to 1/10/99 1/10 to 12/11/99 12/11 to 3/12/99
  11. 11. • Augering – Spot measurements – Accuracy
  12. 12. • Transects – Accurate – 2D
  13. 13. • LIDAR – Not accurate in vegetation – Not usable for small changes
  14. 14. Measuring Process sand transport directly Method Accuracy Reliability Costs Advantage Disadvantage Sand catchers 1 knik ? +/- Low – high easy Splash erosion Sand catchers 2 ? +/- Low-high easy Data loss Electronic device +/- +/- high High resolution data Complicated expensive
  15. 15. Sand traps horizontal vertical
  16. 16. • Sand traps – Spot measurements – Transport direction – Accuracy?? – Difficult to translate to deposition or erosion

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