Wonnacott, RHartnady, CEngelbrecht, Jeanine2016-02-232016-02-232015-08Wonnacott, R, Hartnady, C and Engelbrecht, J. 2015. The management of scarce water resources using GNSS, InSAR and in-situ micro gravity measurements as monitoring tools. South African Journal of Geomatics, Vol 4(3), pp, 213-2232225-8531http://www.ajol.info/index.php/sajg/article/view/120880/110312http://hdl.handle.net/10204/8391Copyright: 2015 CONSAS Conference. Due to copyright restrictions, the attached PDF file only contains the post-print version of the full text item. For access to the full text item, please consult the publisher's website. The definitive version of the work is published in South African Journal of Geomatics, Vol 4(3), pp, 213-223South Africa is a water scarce country hence the careful monitoring and management of available water resources is critical for the wellbeing of the citizens of the country. A high percentage of the Earth’s water supply is stored underground which can be extracted either through pumping or using artesian pressure. This paper describes the application of GNSS, InSAR and In-Situ Micro Gravity measurements for the monitoring of an artesian wellfield in the Oudtshoorn District in the Western Cape province of South Africa. GNSS receivers were run continuously for a period of 133 days between March and August 2014 to detect possible surface subsidence during pumping and artesian free flow extraction of water in the wellfield. Two InSAR scenes were processed, one during the peak period of water extraction from the wellfield and the other approximately 4 months after all boreholes were closed and pumps switched off. A micro-gravity campaign was conducted over two days in the wellfield with the gravity meter co-located at one borehole which was opened on the second day of the campaign. The results from the GNSS monitoring showed a subsidence of approximately 15 to 20 mm at the peak of the free flow and pump while those from the InSAR and micro-gravity measurements were largely inconclusive.enGlobal Navigation Satellite SystemsGNSSDifferential Interferometric Synthetic Aperture RadarInSARMicro-gravityWater resourcesArticleWonnacott, R., Hartnady, C., & Engelbrecht, J. (2015). The management of scarce water resources using GNSS, InSAR and in-situ micro gravity measurements as monitoring tools. http://hdl.handle.net/10204/8391Wonnacott, R, C Hartnady, and Jeanine Engelbrecht "The management of scarce water resources using GNSS, InSAR and in-situ micro gravity measurements as monitoring tools." (2015) http://hdl.handle.net/10204/8391Wonnacott R, Hartnady C, Engelbrecht J. The management of scarce water resources using GNSS, InSAR and in-situ micro gravity measurements as monitoring tools. 2015; http://hdl.handle.net/10204/8391.TY - Article AU - Wonnacott, R AU - Hartnady, C AU - Engelbrecht, Jeanine AB - South Africa is a water scarce country hence the careful monitoring and management of available water resources is critical for the wellbeing of the citizens of the country. A high percentage of the Earth’s water supply is stored underground which can be extracted either through pumping or using artesian pressure. This paper describes the application of GNSS, InSAR and In-Situ Micro Gravity measurements for the monitoring of an artesian wellfield in the Oudtshoorn District in the Western Cape province of South Africa. GNSS receivers were run continuously for a period of 133 days between March and August 2014 to detect possible surface subsidence during pumping and artesian free flow extraction of water in the wellfield. Two InSAR scenes were processed, one during the peak period of water extraction from the wellfield and the other approximately 4 months after all boreholes were closed and pumps switched off. A micro-gravity campaign was conducted over two days in the wellfield with the gravity meter co-located at one borehole which was opened on the second day of the campaign. The results from the GNSS monitoring showed a subsidence of approximately 15 to 20 mm at the peak of the free flow and pump while those from the InSAR and micro-gravity measurements were largely inconclusive. DA - 2015-08 DB - ResearchSpace DP - CSIR KW - Global Navigation Satellite Systems KW - GNSS KW - Differential Interferometric Synthetic Aperture Radar KW - InSAR KW - Micro-gravity KW - Water resources LK - https://researchspace.csir.co.za PY - 2015 SM - 2225-8531 T1 - The management of scarce water resources using GNSS, InSAR and in-situ micro gravity measurements as monitoring tools TI - The management of scarce water resources using GNSS, InSAR and in-situ micro gravity measurements as monitoring tools UR - http://hdl.handle.net/10204/8391 ER -