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DSD-INT 2019 Wetland restoration modelling - A case study in the German Middle Mountains - de Roover

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Presentation by Sam de Roover, HydroLogic, The Netherlands, at the wflow - User Day (Developments in distributed hydrological modelling), during Delft Software Days - Edition 2019. Friday, 08 November 2019, Delft.

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DSD-INT 2019 Wetland restoration modelling - A case study in the German Middle Mountains - de Roover

  1. 1. Wetland restoration modelling A case study in the German Middle Mountains
  2. 2. Contents • Introduction • Methods - 3 stage rocket • Results – Stage 1: micro scale analysis – Stage 2: translation – Stage 3: macro scale analysis • Conclusions
  3. 3. Wetland restoration - the idea • Restoration of wetland areas in valleys of German Middle Mountains • Remove constructed drainage networks • Change surface water flow regime: – increase storage – retain water – slow down discharge • Potential area: 7% of highlighted areas ->
  4. 4. Introduction project • The impact of wetland restoration measures • Peak flow reduction • German Middle Mountains • Small time scale for project: Assess the potential
  5. 5. 3-stage rocket 1. Microscale SWAT+ model 2. Translation 3. Macroscale wflow_sbm model SWAT+ model Kylldal wflow Kylldal wflow Rhine + Mosel
  6. 6. First stage: methods micro scale SWAT+ model (Acacia) • Change in land cover and stream characteristics – Vegetation flood plain – Stream characteristics • increase width • decrease depth • increase roughness coefficient SWAT+ model Kylldal wflow Kylldal wflow Rhine + Mosel
  7. 7. First stage: results micro scale • Lower peak flows • Increase in baseflow recessions • Increase of low flows (less drought risk)
  8. 8. Second stage: methods translation • wflow_sbm - existing model Rhine area • Sensitivity analysis • Comparison statistics SWAT+ <-> wflow • Wetland effect: 200% increase Manning coefficient SWAT+ model Kylldal wflow Kylldal wflow Rhine + Mosel
  9. 9. Third stage: methods macro scale wflow_sbm • 7% of area fit for restoration • We looked at cells: – Within selected area – Contains stream order 2 – Random number to get to 7% • Change Manning coefficient for those cells SWAT+ model Kylldal wflow Kylldal wflow Rhine + Mosel
  10. 10. Third stage: results macro scale Results on frequency of high discharges MoselRhine
  11. 11. Overview assessment effects of wetland restoration Kylldal Mosel Rhine Wetland restoration intensity 45 % 50 % 50 % Annual maximum peak discharge change -13 % -2.9 % -1.1 % Annual 95th percentile change -3 % -0.9 % -0.1 % Annual median change 9 % 0.6 % 0.1 %
  12. 12. Conclusion use of wflow in the project • Use existing model to assess impact of large scale measure. 1. Translation 2. Calibration 3. Wetland modelling wflowMicroscale model Wetland restoration effects New map data 1 2 3 Discharge
  13. 13. Wetland restoration modelling A case study in the German Middle Mountains

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