Transcript OROMA ePoster - Brockmann Consult

Operational Radar
and Optical MApping
Partners
Overview
The OROMA team consists of
7 developers and 4 end users
from coastal management:
Beach nourishment is the most
valuable measure to conduct
coastal protection. To keep
control on the sand induced to
the near shore environment
it needs area covering monitoring.
As examples of the OROMA work
two different methods using ground
based radar for the bathymetric
survey are presented at this poster:
• Imaging the ocean wave field
• Scanning sea surface roughness
The water quality is indicated by
its concentration of algae, suspended
matter and yellow substance.
These substances can be measured
by optical remote sensing from space
borne sensors. However, the quality
of these measurements needs to
be assessed and compared with
existing archives of monitoring data
of the same geophysical quantities
in order to introduce them into the
monitoring programmes.
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Objectives
• Monitoring of near coastal morphodynamics
and water quality parameters
• Combining Remote Sensing Modelling
and Electronic Networking Techniques
• Presentation of most actual coastal
monitoring information in near-real time
Information Abstraction
within OROMA
Information abstraction is the backbone
of OROMA. Measurements from ship
and remote sensing data from land,
aircrafts and satellites need to be integrated into models in order to provide
thematic information. Their access
has to be made easily available to
coastal managers.
Operational Radar
and Optical MApping
Bathymetry changes
derived from radar
Comparison Normalised Radar Water quality monitoring
Cross Section with Depth
Bathymetric maps are deduced by inverse
modeling 10 minutes radar observations of
the ocean wave field. The model uses the
wave refraction depending on the local water
depth. The shown bathymetric change is
observed between 2001 and 2003. Close to
shore a loss of sand is obvious, whereas
a broad stripe between 200 m and 800 m
distance from shore shows significant
increase of sand. At the distance of around
1000 m we state another sand reduction
zone. These results have been verified by
conventional observations.
On the right the local water depth is given
with “z” pointing upwards. Under the use of a
calibrated radar the Normalised Radar Cross
Section (NRCS) was composed to a map.
High gradients in the bathymetry induce high
radar cross sections. The next step during
the still running OROMA project is to train
an hydrodynamic model to reproduce the
radar map from the actual bathymetry.
At a later time only the radar map will be
acquired and the model will be inverted to
produce the new bathymetry.
Monitoring of the water quality by ships
is time and cost consuming. Water
constituent concentrations derived from
space borne sensors MERIS, SeaWiFS and
MODIS provide complementary data,
potentially leading to a reduction of in-situ
measurements. It has been proven that the
remote sensing data are comparable to the
existing long-term in-situ archives by local
calibration of the underlying bio-optical
algorithms.