1. Historic overview Egmond: Kick off Plymouth: CSI table Utrecht: Introduction frame of reference Santander: Recasting CSIs into the frame of reference

3. DefinedNot defined Defined Not defined Strategic objective Operational objective  Indicators  Parameters -Monitoring -Measurement -Modelling  System knowledge Reference state Current state 3. Intervention procedure 1. Quantitative state concept 4. Evaluation procedure 2. Benchmarking procedure Momentary coastline Intertidal Coastline X Beach width Exceedance curves IBCSI

4. Overview Dutch presentations Arno (RIKZ): Introduction Aart (UU): Scientific results and CSIs –highwater line and beachwidth –storm Egmond Stefan (WL): Scientific results and CSIs –multiyear evolution of nourished beach (beach width) –video derived observations of longshore currents Troels (UCo): Scientific results Arno (RIKZ): Recasting scientific results into the frame of reference

5. DefinedNot defined Defined Not defined Strategic objective Operational objective  Indicators  Parameters -Monitoring -Measurement -Modelling  System knowledge Reference state Current state 3. Intervention procedure 1. Quantitative state concept 4. Evaluation procedure 2. Benchmarking procedure Momentary coastline Intertidal Coastline X Beach width Exceedance curves IBCSI

6. Example: Dynamic Preservation Strategic objective: “Sustainable preservation of functions and values in the coastal zone” Structural erosion no longer acceptable Operational objective: “Maintain the coastline at its 1990 position”

7. 1. Quantitative State Concept

8. 2. Benchmarking procedure

9. 3. Intervention procedure

10. “Sustainable preservation of functions and values” “Maintaining the coastline at its 1990 position”  System knowledge  State indicators -JARKUS BCL TCL 3. Nourishment 1. Momentary CoastLine (MCL) 4. Evaluation procedure 2. Benchmarking procedure OK? Not OK? Frame of reference: Dynamic Preservation

11. Video Survey Array y = -130 m Array y = -1500 m Video-based quantification of the MCL (Subtidal Beach Mapper, Aarninkhof 2003)

12. Working with the Intertidal coastline Strategic objective: –sustainable preservation of functions and values Operational objective: –maintain the coastline at its 1990 position QSC: –location of the coastline based on the intertidal beach volume - MICL Benchmarking procedure: –Reference: 10 year regression of MICLs to find the 1990 coastline - BICL –Test: 10 year regression of MICLs to find the year T coastline - TICL Intervention procedure: –IF the TICL exceeds the BICL THEN nourish Evaluation procedure: –Coastline will be maintained at its 1990 position –Maybe the existing procedure is represented but ARGUS data not effectively used NAP-5m NAP+3m (Dunefoot) MCLMICL

13. Time (months) MCL & MICL (m) Egmond MCL (surv.) and MICL (vid.) – Raw data Time (months) MCL & MICL (m) MICL (video) MCL (survey) Egmond MCL (surv.) and MICL (vid.) – Normalized data

14. Working with the high water line Strategic objective: –guarantuee sustainable safety of beach property Operational objective: –build no property seaward of the line with a 5% exceedance probability QSC: –probability curves of the high water line Benchmarking procedure: –Reference: location of the 5% exceedance line –Test: exceedance percentage of desired location Intervention procedure: –IF percentage of desired location is too high THEN relocate Evaluation procedure: –No property built at locations with exceedance probabilities higher than 5% –Long term developments unknown (system timescale & policy timescale)

15. Location of the exceedence curves of the high-tide levels 14-09-2001 9 GMT 2001

16. Working with beach width Strategic objective: –guarantuee sustainable recreation on the beach Operational objective: –maintain a minimal beach width for bathing people QSC: –width of inter tidal and supra tidal beach (waterlines) Benchmarking procedure: –Reference: minimal beach width (to be defined by the end user - municipalities) –Test: actual beach width as measured by ARGUS Intervention procedure: –IF actual beachwidth smaller than reference beach width THEN nourish Evaluation procedure: –Beach width maintained constant throughout the season –Nourishments during wintertime could be inefficient

17. Width of the inter-tidal & supra-tidal beach d c b a beach width (m) beach width (m) beach width (m) tidal range (m) Time: 2001-2002 Y = -250m Y = -500m Y = -750m Inter-tidal beach Mean width = 80 m

18. beach width (m) beach width (m) beach width (m) tidal range (m) Time: 2001-2002 Y = -250m Y = -500m Y = -750m Supra-tidal beach Mean width = 50-60 m d c b a

19. This presentation was brought to you by: Arno de Kruif Stefan Aarninkhof Aart Kroon Troels Aagaard Susanne Quartel Mark van Koningsveld Discussion