WP6 Spanish Costa Brava site

Transcription

1 WP6 Spanish Costa Brava site J.A. Jiménez, H.I. Valdemoro, V. Gracia E.T. Mendoza, A. Sánchez-Arcilla Laboratori d Enginyeria Marítima ETSECCPB Universitat Politècnica de Catalunya

2 Lloret de Mar S Abanell

3 le (years) T - sca 10 2 NL PL RO ES IR UK NL 10 0 UK ES NL PL RO 10-2 ES1 ES S - scale (km)

4 Site 1 S Abanell beach - Spain Length 2.5 km Width 40 m Processes Long-term (decadal) erosion Storm-induced d erosion

5 Beach long-term (decadal) d evolution 3000 sa Palomera tudinal (m) distancia longit puntos de control inicio paseo Platj a de s'abanell tasas evolutiva as (m/a) Torde era sa Palo omera Tordera limite interior de la barra de la desembocadura (2000) perfiles de control distancia transversal (m)

6 0 ~ 30,000 m 3 /y

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8 Storm induced erosion Extreme wave climate H s,o (m m) Beach erosion modelling T r (years) = +0.5 m = 0.0 m elevation (m) = +1.0 m initial profile distance (m)

9 Problem: Damage of Infrastructures Problem: Damage of Infrastructures Objective: Enhance safety of infrastructures

10 Problem: Affectation of beach use Problem: Affectation of beach use Objective: Maintain recreational carrying capacity

11 FAVOURABLE SEDIMENT STATUS WINTER (stormy period) Protecting infrastructures: Volume of sediment required to generate a beach wider than the one to be eroded by storms (Tr to be selected ). SUMMER (calm period) Recreational carrying capacity: SUMMER (calm period) Recreational carrying capacity: Volume of sediment required to generate a beach wide enough to accomodate users (~ 30 m ).

12 STRATEGIC OBJECTIVE To have a sustainable beach Protection - Recreation OK? OPERATIONAL OBJECTIVE To maintain beach configuration for IP OK? OPERATIONAL OBJECTIVE To maintain beach configuration for CR QUANTITATIVE BENCHMARKING INTERVENTION EVALUATION STATE CONCEPTS Definition coastal cell Beach nourishment Localized Retreat PROCEDURE C. Cell functioning FAVOURABLE Infrastructure S. Sediment Reservoir? SEDIMENT STATUS reinforcement INDICATORS Beach width (x,t) CURRENT SEDIMENT STATUS

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14 Nov 2007 ~ 180,000 m3 Pasado, presente y futuro de la Platja de s Abanell Blanes, 2 Mayo 2007

15 Site 2 Lloret de Mar beach- Spain Length 1.2 km Width 50 m Processes Long-term (decadal) equilibrium + shoreline seasonal fluctuations (sediment redistribution ib ti within the cell) + storm-induced erosion

16 June July Agost Setember October November December ENE-ESE SW-SSE ENE-ESE SW-SSE February March April May January ability of ocurrence July mean energy content (m 2 /day) during storms Proba December November October Setember Agost June 0 January February March April May

17 ~ 0 ~ 0

18 26-Jun Jun Jun Jun Jun Jun-98 Beach long-term (decadal) evolution Planar surface Volume Ratio of change respect mean values Jul Jun Jun Jun Jun Jun-96

19 East South

20 Problem: Damage of Infrastructures Problem: Damage of Infrastructures Objective: Enhance safety of infrastructures

21

22 Problem: Affectation of beach use Problem: Affectation of beach use Objective: Maintain recreational carrying capacity

23 FAVOURABLE SEDIMENT STATUS WINTER (stormy period) Protecting infrastructures: Volume of sediment properly distributed along the beach in such a way that the beach is wider than the reach associated to storm impacts (Tr to be selected ). SUMMER (calm period) Recreational carrying capacity: Volume of sediment properly distributed along the beach in such a way that the beach is wider than a minimum recreational width (~ 30 m ).

24 Beach width range Be each width (m) Mean width Maximum width 30 Minimum width South end Profiles North end

25 Ltotal 30 m W óptimo SR L W 30 m SR L

26 Ltotal 30 m W óptimo L W 30 m L

27 Behaviour Model - Eastern storms Northern rotation scenario Minimum width 30 m Southern rotation scenario Minimum width 38 m Initial layout Qualitative Risk High Medium Low