TITLE:
Practical Experiences with the First Relative Gravimeter of Type Scintrex CG-6 Autograv in Dubai, The United Arab of Emirates
AUTHORS:
Ossama S. Aly, Basem Elsaka, Eman A. Al Khatibi
KEYWORDS:
Terrestrial Gravity Field, Scintrex CG6 Autograv, Drift Correction
JOURNAL NAME:
World Journal of Engineering and Technology,
Vol.8 No.2,
May
25,
2020
ABSTRACT: In September 2019, the Dubai Municipality of Dubai Emirate, the United
Arab of Emirates, has received its first Scintrex CG-6 Autograv gravity meter.
This paper describes the installation and initial gravity signals with the new
CG-6 Autograv gravimeter. Two gravity field sites have been selected in Dubai
City and Hatta mountainous area. The relative gravity field measurements have
been recorded for about one month time span; two weeks in Dubai and two weeks in Hatta.
Among different effects reducing the gravity measurements, the tide and drift
corrections have been focused on this paper. Two tidal models have been applied
to reduce the tide effect based on the automated ETGTAB of the CG-6 gravimeter
and ETERNA3.3 software. The results regarding the tide correction show very
small discrepancies between both models (ETGTAB and ETERNA3.3) of about 2.2 μGal
and 2.6 μGal in terms of standard deviations at Dubai and Hatta gravity
stations, respectively. So, the outcome of the precise tidal model of CG-6
Autograv gravimeter is reliable for tidal reduction within Dubai area and its
surroundings. Regarding the drift correction, the CG-6 Autograv provides low
instrument drift values about 2.44 μGal and -2.35 μGal per day for the Dubai and Hatta
stations, respectively. Furthermore, it is recommended that the Hatta gravity
station would be considered as a stable and trusted gravity site. For Dubai
gravity station, the gravity observations are affected by some noises from
traffic activities while recording the gravity signal during the working days.
Therefore, it is recommended for Dubai
gravity station to be measured during the weekends and at nights in
order to avoid any noises affecting the CG-6 gravimeter.