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Methodology for the estimation of morphodynamic evolution of the “El Puntal”
http://www.gioc.unican.esAutoridad Portuaria de Santander
Universidad de Cantabria (UCa)
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Issue Questions addressed CSI Argus input Field measurement
2 Position of coastline ok? 2 How much is the Spit tip Evolving?
nearshore bathymetry * beach width ** shoreline position ***
intertidal beach profile 2 sub-tidal profiles 3-4 waterlines 1, dunefoot 2 waterlines 1
beach profiling,waves,tide nearshore profiling beach surveys, wave set-up beach surveys, wave set-up Coastal Safety & Maintenance
2 Are dunes stable? dune profile (dune height) ** shadows of dunes 3 dune surveys
3 Is beach width adequate? beach width *** shoreline position *
waterline 1, dunefoot 2 waterlines 1
beach surveys beach profiling set-up measurements(waves,tide)
3 Is the beach crowded? density of seaside users ** (no technique 2) beach users survey Recreation & Tourism
3 Is it safe to swim? 3 Swimming hazard areas (physical)
longshore current velocities *** rip current velocities *** rip location and spacings *** wave height */ wave type *
longshore array – foam 2 cross-shore array 2-3 bar and rip locations 1 ? 3-4 / 2
current measurements, drifters longshore set-up gradients beach surveys
Shipping & Navigation
1 Is navigation channel suitable?
nearshore bathymetry *** dredging volume and position***
sub-tidal profiles 3-4 intertidal beach profile 2
nearshore profiling beach profiling,
3 Is there pollution on the beach?
oil spill** debris**
(no technique 2) (no technique 2)
dark spot survey dark spot survey Natural values
2 Is dune vegetation healthy? area of vegetation** vegetation line 1 vegetation spot survey
Stability of the
coastal zone?**
Stability of the
coastal zone?**
Beach suitable
for tourism?*
Beach suitable
for tourism?*
Safe navigation
in the area?***
Safe navigation
in the area?***
Natural values
Preserved?*
Natural values
Preserved?*
The bold questions refer to the strategic objectives, while the normal questions refer to the operational objectives. - The questions addressed are first prioritized for the Spanish situation at El Puntal Spit. Strategic objectives are ordered to their importance: *** means high importance, * means low importance.- Normal questions are referred to the end user involved/interested: 1 Santander Port Authority – 2 Ministry of Environment – 3 Municipality of Somo and Santander
The CSIs are also ordered to their importance: *** means high priority, * means low priority.The final CSIs for El Puntal Spit are underlined. The ARGUS input is classified to its degree of success. 1 means easy to execute and leading to a good result, 4 means difficult to determine (technology not available at present) and probably difficult to reach a success within the time of the COASTVIEW project.The final decision of the selection of CSIs is also based on the ARGUS input and Field measurements (ground-truth) possibilities.
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Dre
dgin
g
Dumping
Review of the problem
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Sand Volume exceeding a theoretical threshold
Surveying the bathymetry
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Image interpretation and analysisImage interpretation and analysis
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Panoramic view (merged images)http://www.gioc.unican.es
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Rip Currents
Wave dissipation
It shape of mega ripples
Detection of BarsDetection of shoreline
Dunes vegetation
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The video techniques used to achieve the period of dredging and the volume are:
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• The first techniques is called time-stack and provide the period of dredged with the morphological evolution of cross-shore profiles.
• Furthermore, the volume of dredged is fixed with mapping intertidal bathymetry technique.
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...morphodynamic evolution of cross-shore profiles.
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16:00
12:00LT
LT
HT
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(Timex Image)
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(xy)
(UV)
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DB
0 200 400 600 800 1000 12000
100
200
300
400
500
600
Argus Meta-Info
Camera Info Tide
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Load oblique image
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The intensity profile sampled along cross-shore line through an oblique image
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Time-stack image analysis
Period of dredging
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I(k)/k < T
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Technique to automatic detection of shoreline position
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Red Green Blue
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Time-stack with automatic detection of shoreline position
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Time (each hour)
Dis
tan
ce a
lon
g th
e p
rofi
le (
Nu
m. P
ixel
s)
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Trend of shoreline at low tide
Threshold defined
Shoreline at low tide
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1. Instalación del sistema2. Puntos de control (GCP) 3. Tipos de imágenes4. Análisis de los resultados5. Campañas de campo
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...the volume of dredging
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LT
LT
HTX
Y
Z
Subtidal bathymetry
DUNE
Hight
Low
Intertidal bathymetryIntertidal bathymetry
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25 de Mayo del 2003
-18
-16
-14
-12
-10
-8
-6
-4
-2
0
0 50 100 150 200 250 300 350 400 450 500 550 600 650
DISTANCIA (m)
PR
OF
UN
DID
AD
(m
) PERFIL 1
PERFIL 2
PERFIL 3
PERFIL 4
PERFIL 5
PERFIL 6
PERFIL 7
b
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P4P3P2P1
BL1
P5 P6 P7