This paper describes utility of measuring settlement system with magnetic-transmission type water pressure gauge. In this system, settlement data can be acquired on board as magnetic wave from the gauge. The electromagnetic wave has very low frequency and can transmit through seawater, sediment and the atmosphere. Therefore, measurement can be taken without cables and its guide even if the gauge is buried in sand. Moreover, this system does not obstruct dumping and reclamation work in contrast to settlement plate with steel pipe.
A series of tests on utility of this system was performed in the construction site of the Kansai International Airport. In these test, influences of dumping work on accuracy of measurement and strength of electromagnetic waves were investigated. After successfully performing these tests, this system is now being used in coastal reclamation projects.
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