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Anat (21)
Aviel Ron (54)
Ofer (17)
In Memory of Aviel Ron
Director General of the Survey of Israel (1994-2002)
and his two children-Anat and Ofer
Murdered during a terror attack in Haifa 31.03.2002
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Israeli Coast Sea Level Changes During 1958-2001
Boris Shirman [email protected]
Yossi Melzer [email protected]
Survey of Israel
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Targets of Sea Level Monitoring in SOI
Update the “zero level” value of the geodetic vertical network
Determination of long term changes and variation in sea level
Maritime Mapping
Collecting Data for interdisciplinary research
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The Mediterranean Basin
and the Israeli Coast
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SOI Tide gauge array along the Med. Sea 2002
(Satellite Image)
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SOI Tide gauge array along the Med. Sea 2002
Port Of Haifa
Tel Aviv Marina
Port of Ashdod
Ashqelon Marina
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Port of HaifaCooperation between SOI and IPA
Radarsensor Kalesto
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Port Of HaifaCooperation between SOI and IPA
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Tel Aviv – Marina
SOI station-digital float tide gauge
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Port of Ashdod
Cooperation between SOI and IPA-digital float tide
gauge
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Ashkelon Marina
SOI station-digital float tide gauge
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Tide Gauge
Calibration
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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 diver – Twice a year
Annual Report
Equipment maintenance-according needs
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Types of data used for the study
Years Location data source data sampling data source
1958-1960 Ashdod Tables Month Avr. IPA 1961-1984 Ashdod Tables Hour Avr. IPA 1962-1989 Yafo Analog Digitizing SOI
1990-1995 Ashdod Analog Digitizing SOI
1996-2001 Tel-Aviv Digital 5 min SOI
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Tel-A viv
Ashdod
Ashdod - Tel-Aviv
m ean = 1 .0 cmst. dev. = 1 .1 cm
260 270 280 290 300 310Ju lian days (16 S ep-13 N ov), 1999
-0 .2
0.0
0.2
0.4
Tid
e, m
-0 .2
0.0
0.2
0.4
Tid
e, m
-0 .2
0.0
0.2
Diff
ere
nce
s, m
è åúù øé
à ëñ ì å
è å ç ù åï
à ç ù åï Comparison
Between
Tel Aviv
data
and…
Ashdod
data
Mean: 1 cm
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f req ue ncy , 1 /da y
0
10000
20000
30000
Spe
ctra
l am
plitu
de, c
m
1 .0 2.0 3.0 4.0
01 03 04 06 08 10 12m on th
-40
-20
0
20
40
60
80
Sea
leve
l, cm
S ea levelT el-Aviv 2000
diurnal
sem idiurnal
monthly
Spectrum Analysis
Recorded
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f req ue nc y, 1 /da y
0
10000
20000
30000
Spe
ctra
l am
plitu
de, c
m
1 .0 2.0 3.0 4.0
01 03 04 06 08 10 12m on th
-40
-20
0
20
40
60S
ea le
vel,
cmA stronom ica l tide 2000
diurnal
sem id iurnal
month ly
Spectrum Analysis
Predicted
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62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86Years
-30
-20
-10
0
10
20
30S
ea le
vel,
cm
-30
-20
-10
0
10
20
30
Sea
lev
diffe
renc
es, c
m
Dif ferenc es be twe en As hd od an d Y afo s tations
Co m pile d A sh do d a nd Ya fo rec ord s reffe re d to Y afo da tum
Comparison between the monthly mean sea level of Yafo and Ashdod
The differences corrected to Yafo Datum (remained stable)
S.D. of 4 cm (random according to stat. test)
62-67 :-0.2cm
68-83 :-4.8cm
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f req ue nc y, 1 /ye ar
0
500
1000
1500
Spe
ctra
l am
plitu
de, c
m
1958 1961 1964 1967 1970 1973 1976 1979 1982 1985 1988 1991 1994 1997 2000Ye ar
-40
-30
-20
-10
0
10
20
30
40
Sea
leve
l, cm
S pe ctrum
E as t M editer ran ea n S ea lev el cha ng es
1.0 2.0 3.0 4.0 5.0 6.0
Israeli Cost Sea Level 1958-2001
Spectrum Analysis
FFT
Yearly cycle
Third year cycle
)Meteo. Effect(
Half year cycle
Multi year cycle~20y
Average: +5.9 cm
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58 61 64 67 70 73 76 79 82 85 88 91 94 97 00Years
-8
-4
0
4
8
12
16
Sea
leve
l, cm
On e y ea r a verag ed & eig ht yea rs sm oo the dEa st Me dite rra ne an Se a le ve l (19 58 -20 01 )
Israeli Coast Yearly mean sea level 1958-2001
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67 69 71 73 75 77 79 81 83 85 87 89 91 93Years
(m idd le of averag ing period)
0
2
4
6
8
1018
.6 y
ears
ave
rage
d se
a le
vel,
cmTime serious avereges during a period of 18.6 years
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Future Plans
To improve accuracy of the digitized data
To digitize analog data previous to 1958
To apply advanced models
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Summary
The research indicates the existence of several periods of sea level cycles: Monthly, Yearly, Multi-Yearly
Since 1991 the sea level rose more than 10 cm
We must follow the present multi year cycle in order to verify sea level rise along the Israeli coast
We are looking to find correlation with other sites at the Mediterranean Sea