Applying Management Frameworks: Experiences from CONSCIENCE sites across Europe Prof A. Sánchez-Arcilla, Prof. J.A. Jiménez, & the CONSCIENCE WP6 team
Mar 28, 2015
Applying Management Frameworks: Experiences from
CONSCIENCE sites across Europe
Prof A. Sánchez-Arcilla, Prof. J.A. Jiménez,
& the CONSCIENCE WP6 team
To test the applicability of the management concepts and models developed within the project (the CONSCIENCE approach).
The field sites are selected to represent the most common European coastal types: sand and gravel/shingle coasts; high-energy open coasts (Atlantic coasts), medium-energy coasts (North Sea coasts, English Channel coasts) and low-energy coasts (Mediterranean, Baltic Sea and Black Sea)
OBJECTIVES
CONSCIENCE Coastal Sites (6)
1. Dutch coast, NL (North Sea).
2. Hel Peninsula, PO (Baltic Sea).
3. Danube delta stretch, RO (Black Sea).
4. Costa Brava Bays, ES
(Mediterranean Sea).
5. Pevensey Bay, UK (English Channel).
6. Inch Beach, IR (Atlantic Ocean).
S - scale (km)
T -
sca
le (
year
s)
10 210 110 010 -1
10 2
10 1
10 0
10 -1
10 -2
ES2
ES1
ES1 ES2
NL
NL
NL
PL
PL
RO
RO
UK
UK
IR
Pentagonal Approach
Specific – Site – dependent
Measurable – Based on data
Applicable – Local stake-holders
Realistic – Available Info Means/Tools, Laws, Adm.
Time – dependent (t/scales)
A SMART FRAME OF REFERENCE
Pentagonal Approach
Sediment Cell
Favourable Sediment Status:- No deficit- “Natural” deficit
Resilience- Restore Sed. Balance (Artificial Nourishment)- Reduce “intesity” of drivers (Coastal Works)- Space for coastal processes (Re-alignement)
Strategic sediment Reservoirs
Selecting t/s scales
Based on 5 concepts
Frame of Reference
What is the problem Objective
How big is it: C.S Indicators(from Reference State Desired State)
When action is needed ThresholdsWhat action Catalogue + Concepts
How does it work Monitoring
Based on 5 questions
Strategic objective
Tactical objective
2. Benchmarking procedure
3. Intervention 4. Evaluation procedure1. Quantitative State
Concepts
Desired state
Current state
OK?
OK?
Str
ateg
ic
leve
lT
actic
al
leve
lO
pera
tiona
l le
vel
WHY
WHAT
HOWWHEN
WHERE
WHO
Location, scale
The Dutch coast and its three regions.
Long.term resilience coastal foundation 3 sub cells of coastal foundation
Netherlands
CZ ↔ Country Safety
dunesbeach
shore face
MSL
- 20 m
residual strength
basal coast line
coastal foundation
3 different scales in coastal management in the Netherlands. Each scale associated with a specific coastal cell and benchmarking of a specific tactical objective:
Temporal scale: Spatial scale:- Residual strength days meters- Basal Coast Line (BCL) years kilometers- Coastal foundation decades / centuries 10’s / 100’s kilometers
Frame-of-Reference for coastal erosion management in the Netherlands. Question marks indicate issues that are still open for decision making.
Danube Delta in Black Sea. The dotted rectangle indicates the coastal cell (CONSCIENCE Pilot Site).
Location, scale
Sediment transport paths with CERC and wave conditions from SWAN and wind fields
Proposal for strategic sediment reservoirs:
1)sediments blocked by the jetties in the Musura Bay and
2)sediments dredged from the channel and discharged off the littoral system
Lloret de Mar
S’Abanell
Location, scale
0
~ 30,000 m3/y
Problem: Damage of Infrastructures Objective: Enhance safety of infrastructures
Problem: Affectation of beach use Objective: Maintain recreational carrying capacity
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: Volume of sediment required to generate a beach wide enough to accomodate users (~ 30 m ).
~ 0
~ 0
Problem: Damage of Infrastructures Objective: Enhance safety of infrastructures
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 ).
STRATEGIC OBJECTIVETo have a sustainable beach
Protection - Recreation
OPERATIONAL OBJECTIVETo maintain beach configuration for IP
OPERATIONAL OBJECTIVETo maintain beach
configuration for CR
QUANTITATIVE STATE CONCEPTSDefinition coastal cell
C. Cell functioningS. Sediment Reservoir?
INDICATORSBeach width (x,t)
BENCHMARKING
FAVOURABLE SEDIMENT STATUS
CURRENTSEDIMENT STATUS
INTERVENTIONBeach nourishment Localized Retreat
Infrastructure reinforcement
EVALUATIONPROCEDURE
OK ?
OK ?
Danube Delta(Romania)
Hel-Peninsula(Poland)
Pevensy(England)
Netherlands Lloret-Blanes(Spain)
Erosion Rates (~) (m/yr)
10 5 1 ArtificiallyReduced
1 (var.in space)
Sed. Deficit (~) (106m3/yr)
1 0.1 – 0.6 0.02 6 (’90 – ’00)12 (’00 – ’10)
0 (Ll)0.03 (Bl)
L – scale (km) 50 35 10 400 2
FavourableSed. Status
Natural Budget
Natural Budget
Maint. Thresh. (volume, width) only last 1 yr
Maintain ’90 state
Maintain beach width / volume
Present Actions
Dredging and disposal outside
CZ
Artificial Nourishment(since 1989)
Annual Nourish.Reshaping
(plan/profile)
Period. Nourishm.Excp. hard works
Re-shaping Nourishment Reinf. Seawall
Sl Transport Rates
(x103m3/yr)
1.500 70Sl CERC ~
10xSlKamph(Sl CERC more
realistic)
15 – 30Groyne
Reduction ≈ 1/5 Formulae
Under-predict
Based on observed changes
30
Main Processes
Breaching Breaching OverwashRoll-back
Flooding Beach Oscillat.River mth. losses
Danube Dlta(Romania)
Hel-Penins.(Poland)
Pevensy(England)
Netherlands C. Brava(Spain)
Strategic Objective (+ preserving CZ)
Sust. Development
Resilience Sustainable Risk
( 400 ~ ּז yrs for breach.)
Flooding Risk up to 4.000 ּז)
yr)
Sustainable functions
(protection, recreation)
Operational Objective
Reduce Erosion
Avoid Breach.
Maintain Width
Hold the line Maintain ’90 shore (Dune) + Coastal Found. (-20m)
Maintain Beach
width
Proposed Solution
Nourishment- From River
Mouth (1/2 deficit)
- No from spit
Nourishmt. - Increase
width
Nourishment -Increase widthReduce Sl with works
Nourishment - Increase
space - Increasing
Vol. with t
NourishmentRe-shaping
(plan /profile)Reduce Sl at
S bound.
Strategic Sediment Reservoirs
2 identified- Bay- River Mouth
3 identified- Harbour
entrance- Bays- Offshore
2 identified- Licensed
offshore areas
1 identified- Dutch
Continental Shelf (> -20m)
1 identified - River Mouth
Danube Δ(Romania)
Hel-Peninsula(Poland)
Pevensy(England)
Netherlands C. Brava (Spain)
CSI Sl
Erosion Rates
Beach width /height
Dune width /height
- Beach width/volum
- 5m contour position (from 2000)
- Dune Vol.- Coastline
(from 1990)- Coastal
Foundation Volume
- Beach width
- Berm height
Knowl. Required
Generic Long-Term data series
Uncertainties - Drivers
(RSLR now 2.8 mm/yr, 15mm/yr in 2100)
- Responses (Sl reduct. ↔ groynes)
- Integration of episodic, mid and long-term scales
- Inner shelf processes (Coastal Foundation)
- Cell barriers (total or partial)- Torrential river input (with submarine canyon)- Joint probability of storm impact for a given configuration
CONCLUSIONS
The CONSCIENCE approach has been verified at different T- and S- scales and for coasts subjected to different processes and problems.
The frame- of- reference is an useful way to approach to managing coastal erosion (provided strategy is defined).
It is possible to define the favourable sediment status for any coast once governing processes are known and objectives are defined (e.g. different status depending on the beach function and scales).
CONSCIENCE papers to be published as an Special Issue of O & C M
EditorialPaper 1. The Conscience frameworkPaper 2. NL case studyPaper 3. PL case study Paper 4. RO case studyPaper 5. UK case studyPaper 6. IR case studyPaper 7. ES case study Paper 8. Set-back linesPaper 9. Erosion science for coastal managementPaper 9. Managing erosion. The Conscience approach