Estimation of Glacial Rebound Effect by Vertical Velocity Analysis Method

Year 2019, Volume: 3 Issue: 1, 58 - 68, 14.01.2019

Simge Tekiç Rahmanlar

Abstract

The physical phenomena occurring on the Earth
with constant dynamic structural changes slowly. Glacial withdrawal movements
are geokodetic changes. Glacial Isostatic Adjustment (GIA) can be used to
estimate the earth's surface, gravitational field and oceans' response to the
growth and melting of ice layers (King et al., 2010). However, the data needs
of these models and the approaches in mathematical analysis reveal the need for
a simplifiedd, less demanding model.

 

The aim of this paper
is to realize the estimation of the post glacial rebound effect by means of GPS
(Global Positioning System) campaign and measurement evaluation methods. In
this study, the linear trend calculation observed in the vertical velocity
component and the estimation of the shell rise after glacier retraction were
investigated. In this direction, time series belonging to 34 IGS stations with
24-hour period of 1995-2017 were used. By means of the MATLAB program, the
values of R² were calculated by least squares method. After that, the
spatial interpolation was made by the ArcGIS program with ”ordinary kriging”
which is a geostatistics technique for obtaining the  spatial representation of the R²
values on the earth was obtained. The obtained map was compared with the map
obtained by Milen GIA model (2002) and the results were interpreted. The
results present that the post glacial rebound rates appears to be 88%
compatible with the R² values. In conlusion, detection and
investigation of glacial effects in any region on earth can be performed with
only vertical velocity monitoring by GPS campaigns.

Keywords

glacial ısostatic adjustment (GIA), ordinary kriging, coefficient of determination (R2)

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