Abstract

The monitoring of ground displacement plays an important role in the risk assessment of volcanoes and slopes; and therefore, stable observations are required over a long period of time. This paper reports the displacement of a dam body surface observed with the GPS displacement monitoring system. The site was a central soil core type of rockfill dam with a height of 161 meters. The GPS measurement of this dam has continued for more than 14 years, including the first impoundment. The tropospheric delay error in the GPS measurement data was corrected using the modified Hopfield model and local weather data. The corrected GPS displacement at the dam crest in the vertical direction showed a good agreement with the settlement of the dam core observed by means of a settlement meter system.

Keywords:
geologist, geological subdiscipline, shimizu, global positioning system, asia government, nakashima, japan government, displacement, correction, long-term displacement
Subjects:
Professionalism, Training, and Education, Information Management and Systems, Communities of practice, Knowledge management
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