1. 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

2. Israeli Coast Sea Level Changes During 1958-2001 Boris Shirman boris@soi.gov.il Yossi Melzer melzer@soi.gov.il Survey of Israel

3. 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

4. The Mediterranean Basin and the Israeli Coast

5. SOI Tide gauge array along the Med. Sea 2002 (Satellite Image)

6. SOI Tide gauge array along the Med. Sea 2002 Port Of Haifa Tel Aviv Marina Port of Ashdod Ashqelon Marina

7. Port of Haifa Cooperation between SOI and IPA Radarsensor Kalesto

8. Port Of Haifa Cooperation between SOI and IPA

9. Tel Aviv – Marina SOI station-digital float tide gauge

10. Port of Ashdod Cooperation between SOI and IPA-digital float tide gauge

11. Ashkelon Marina SOI station-digital float tide gauge

12. Tide Gauge Calibration

13. 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

14. 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

15. Comparison Between Tel Aviv data and … Ashdod data Mean: 1 cm

16. Spectrum Analysis Recorded

17. Spectrum Analysis Predicted

18. 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

19. 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

20. Israeli Coast Yearly mean sea level 1958-2001

21. Time serious avereges during a period of 18.6 years

22. Future Plans To improve accuracy of the digitized data To digitize analog data previous to 1958 To apply advanced models

23. 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