The Indonesian Gravity Field and the Geoid Model

Kasenda, A.; Komara, A. M.; Sutisna, Sobar

doi:10.1007/978-3-642-59745-9_51

Cited by 2 publications

(3 citation statements)

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“…GPS measurements: a differential global positioning system (GPS), Trimble R6, was used to measure the precise coordinates (x, y, z) of the well head (or any other fixed landmark), based on the satellite signals received both at the rover and base stations (Parkinson and Spilker 1996). The geoid height is corrected considering the gradient of the local geoid (Kasenda et al 2000). Then, the ellipsoid height measurements are converted into meters above sea level (m a.s.l.)…”

Section: Measurement Proceduresmentioning

confidence: 99%

A cost-effective device and methodology to compute aquifer transmissivity and piezometry from free-flowing artesian wells

et al. 2022

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Artesian aquifers offer interesting opportunities for water supply by providing a low-vulnerability groundwater resource that is easily abstracted without any installation of pumps or power supply costs. However, hydraulic tests are challenging to perform, notably where the piezometric head is above ground level with free-flowing wells not equipped with valves and open for years. This paper describes a low-cost, easy to reproduce and adaptable device, the free-flowing artesian well device (FFAWD), which is mainly designed with a set of PVC tubes equipped with a pressure probe and a valve. This device is used to perform hydraulic tests on free-flowing artesian wells, to measure the piezometric head of the aquifer and to compute its transmissivity. The practical use of the FFAWD is described and a method is proposed to compute the piezometric head and the transmissivity of the aquifer from this data set (free-flowing well discharge and pressure increase measurements) with any adapted analytical solution, using the Houpeurt-Pouchan method. Artefacts such as post-production effects, surge effects, and the impact of a leaky well are identified to avoid any misinterpretation. The FFAWD was applied to the volcano-sedimentary artesian plain of Pasuruan (Indonesia). The advantages and limitations of using the device, along with the interpretation methodology, are also discussed.

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Section: Measurement Proceduresmentioning

confidence: 99%

A cost-effective device and methodology to compute aquifer transmissivity and piezometry from free-flowing artesian wells

et al. 2022

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“…Under the official name of the Indonesian Geoid Model 1996 (INDGED96), it was constructed by tailoring different sources of gravity measurements (Kahar et al 1997). The dataset consisted of more than 200,000 terrestrial gravity points and 150,000 marine gravity points (Kasenda et al 2000). Despite the huge number of gravity data used from the dataset for geoid modeling, limitations still could not be avoided, i.e., the uneven distribution of gravity measurements.…”

Section: Introductionmentioning

confidence: 99%

“…As a result, INDGED96 showed a relatively poor geoid model accuracy at one region compared with other regions. For example, the difference between gravimetric and geometric geoid (height difference between geodetic height obtained from Global Navigation Satellite System (GNSS) and orthometric height observed from leveling) in Java Island was ranging from 0.2 to 1.0 m, while in Sumatra island was ranging from 0.5 to 1.5 m (Kahar et al 1997;Kasenda et al 2000).…”

Section: Introductionmentioning

confidence: 99%

Gravimetric Geoid Modeling by Stokes and Second Helmert’s Condensation Method in Yogyakarta, Indonesia

Bramanto

Prijatna

Fathulhuda

et al. 2022

International Association of Geodesy Symposia

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Since the last decade, Indonesia has continuously improved the accuracy of the national geoid model by conducting rapid gravity acquisition using airborne and terrestrial gravimetry. As gravity data have been collected thoroughly in all regions, the time has come to carry out Indonesia’s geoid modeling. We started our study by employing the Stokes and Second Helmert’s condensation method to our terrestrial gravity data in Yogyakarta, Indonesia, with a target area of 1∘× 1∘. The computation was based on the commonly applied remove-compute-restore process. We used a satellite-only geopotential model of GO_CONS_GCF_2_TIM_R6 up to degree 300 to remove and restore the long-wavelength part of the gravity field within the modeling process. Numerical results show that few cm of geoid model accuracy was achieved when we compared it to the validation points. Also, our best performance geoid is estimated to be better than the Earth Gravitational Model 2008 (EGM2008) geoid model by up to 2.8 cm in terms of standard deviation.

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The Indonesian Gravity Field and the Geoid Model

Cited by 2 publications

References 0 publications

A cost-effective device and methodology to compute aquifer transmissivity and piezometry from free-flowing artesian wells

A cost-effective device and methodology to compute aquifer transmissivity and piezometry from free-flowing artesian wells

Gravimetric Geoid Modeling by Stokes and Second Helmert’s Condensation Method in Yogyakarta, Indonesia

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