Methodology for the estimation of morphodynamic evolution of the “El Puntal”

http://www.gioc.unican.esAutoridad Portuaria de Santander

Universidad de Cantabria (UCa)

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.

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

Rip Currents

Wave dissipation

It shape of mega ripples

Detection of BarsDetection of shoreline

Dunes vegetation

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.

16:00

12:00LT

LT

HT

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(Timex Image)

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(UV)

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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

Time (each hour)

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tan

ce a

lon

g th

e p

rofi

le (

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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

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HTX

Y

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Subtidal bathymetry

DUNE

Hight

Low

Intertidal bathymetryIntertidal bathymetry

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25 de Mayo del 2003

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b

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