Comparison of the OTT radar gauge to the float gauge installed at the Haifa Port Israel

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Comparison of the OTT radar gauge to the float
gauge installed at the Haifa Port
(Israel) Boris Shirman (bshirman_at_netvision.net
.il) Survey of Israel, 1 Lincoln st.,Tel-Aviv,
65220, Israel
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Targets of Sea Level Monitoring at SOI Updating
the zero level value of the geodetic vertical
network Determination of long term changes and
variation in sea level Maritime
Mapping Collecting Data Base for
interdisciplinary research
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Maintenance Procedure Data Download Every
week Tide Gauge Calibration Every week Data
Processing Every week Tide Gauge and BM
stability Twice a year Pipe maintenance by
divers Twice a year Annual Report Every year
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The Mediterranean Basin and the Israeli Coast
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SOI Tide gauge array 2003 along the Mediterranean
Sea (Satellite Image)
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SOI Tide gauge array 2003 Port of Haifa Tel Aviv
Marina Port of Ashdod Ashqelon Marina Port of
Eilat
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The Kalesto Installations
The microwave (24,125 GHz) radar sensor Kalesto
(from the OTT company) operated at the Haifa Port
during 2001. The Kalesto was installed over open
water at about three meters above the water
level. Sea level recording was in digital form
with 5-min sampling and 1 cm resolution.
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Port of Haifa Kalesto Radar sensor Cooperation
between SOI and IPA (Israeli Port Authority)
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The Thalimedes Installations
A float-operated tide gauge Thalimedes (OTT) was
installed at a distance of about 0.5 m from the
radar. The Thalimedes was installed inside an
8-inch diameter tube with a 4-inch opening.
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Port of Haifa KalestoThalimedes
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Comparisons
Sea level differences show long-period stability
for gauges. Monthly linear trends do not exceed
about 1 cm for all three months.
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Data acquisition of the Kalesto and Thalimedes
and their differences during June 2001
mean1.1 cm, Std2.0 cm
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Data acquisition of the Kalesto and Thalimedes
and their differences during July 2001
mean0.0 cm, cm 1.7 Std
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Data acquisition of the Kalesto and Thalimedes
and their differences during August 2001
mean0.5 cm, Std1.2. cm
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Histograms of the Kalesto-Thalimedes differences
June 2001
July 2001
August 2001
Differences Kalesto-Thalimedes are defined as
random
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High-pass FIR digital filter design for analyzing
the high frequency part of the data
High-pass FIR digital filter designed via the
rectangular window cutoff frequency Fc1/hr.
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Sea level records of Kalesto and Thalimedes
filtered by the high-pass FIR digital filter
The filtered records of Kalesto and Thalimedes
contain semidiurnal tides, whereas their
differences comprise a random noise.
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Conclusion Comparison between the Kalesto and
Thalimedes tide gauges shows agreement in sea
level measurements within 1 cm accuracy.