Intertidal Beach

Morphology

from Argus

Susanne Quartel

Aim

• Extracting intertidal beach morphology

– Migration of intertidal beach features

– Beach behaviour on long timescale (weeks –

seasons)

Data

• 13 – 18 February 2002 (springtide on 16th)

• Conditions:– Small waves mainly from the North with short periods

( 5.5 s)

– Offshore wind causing set-down

Argus Noordwijk

Argus Noordwijk

75 m

Method

Method

• Red Green Blue intensity profiles

Method

• Red Green Blue intensity profiles

HWL upper bar trough

water

lower bar

WL

Bar / Trough Migration

lower bar

trough

upper bar

Method

1 2

south

Rip Behaviour

rip 1

Rip Behaviour

south

rip 1

rip 2

Discussion & Conclusions• Migration cross-shore after 5 days:

– upper bar 13 m– trough 6 m– lower bar 10 m

• Behaviour Rip: migration southward and disappears

– seaside 10 m/day– landside 5 m/day

• Criteria– gradients

– RGB – ratio

Future

• RGB – ratio R_ratio = R-(G+B) / (R+G+B)

Future

• RGB - ratio

• Hue Saturation Value

• eCognition (Remote Sensing Programme):

– Object oriented approach extracting

homogeneous regions.

– Segmentation based on colour and shape.

Future