טכניון מכון טכנולוגי לישראל
הטכניון מכון טכנולוגי לישראל - בית הספר ללימודי מוסמכים  
M.Sc Thesis
M.Sc StudentBen-Michael Chai
SubjectMonitoring Sea Level Using GPS
DepartmentDepartment of Civil and Environmental Engineering
Supervisor Professor Gilad Even-Tzur


Abstract

Sea level measurements produced by tide gauges which defined as a mechanism that can determine the vertical distance (height) between the sea surface and an adjacent Benchmark (BM). Modern tide gauges depend on "more sophisticated and less mechanical" methods for measuring and recording sea level. While in the past two decades GPS penetrated massively almost every field of geodetic measurements it is still not in use in the field of sea level assessment. Attempts of using GPS equipped buoys for the determination of precise sea level (at the 1-cm level) were successful and suggest that if carefully used, GPS is capable of replacing the conventional tide gauges. A prototype of GPS based tide gauge was developed and successfully operated showing an accuracy of close to 1 cm. Another test was carried out with a goal of determination the capacity of the GPTG (GPS tide gauge) to connect two distinct tide gauges, and its ability to measure accurately the sea level difference between the two distinct bodies of water - the Red sea and the Mediterranean Sea. Examining the results of the prototype test and the second test resulted in a conclusion that the use of a GPS based Tide Gauge system for the determination of sea level changes is possible, and that its accuracy level (averaged) is equal to a float based tide gauge. For connecting distinct tide gauges, for supervision reasons for example, as well as for an absolute measurement of sea level changes, the greenhouse effect for example, our conclusion is that the GPTG is capable of delivering as good if not better results.