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Geoscientific Instrumentation, Methods and Data Systems An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/gi-2020-32
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/gi-2020-32
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  08 Oct 2020

08 Oct 2020

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This preprint is currently under review for the journal GI.

Morphology of an arid landscape utilising synthetic-aperture radar (SAR) and differential interferometric SAR (DInSAR), southern Riyadh, Central Arabia

Mohamed Daoudi1, Kamel Hachemi2, and Abdullah O. Bamousa3 Mohamed Daoudi et al.
  • 1Department of Geography and GIS, Faculty of Arts and Humanities, King Abdulaziz University, Jeddah, Saudi Arabia
  • 2Physical Geography Laboratory (LGP), UMR 8591, CNRS, University Paris-1 and University Paris-Est, 1 place Aristide Briand, 92195 Meudon Cedex, France
  • 3Department of Geology, Faculty of Sciences, Taibah University, Al-Madinah Al-Munawarah, Saudi Arabia

Abstract. This study on the southern Riyadh area examines the ERS-1/2 and ENVISAT satellites data' ability of detecting Early Quaternary-Holocene trans-tensional Central Arabian graben system morphology. It also, test the hypothesis of potentially geohazardous arid region for the consequent dissolution-induced collapses and karstifications and possible recent faults reactivation. Eight Single Look Complex (SLC) amplitude images are calibrated, filtered, georeferenced, orthorectified, and filtered at a resolution of 20 metres, and compared with one another by producing 17 diachronic images of the pairs at different intervals (1996, 2003–2005, 2008). The diachronic SAR intensity imageries suggest a downthrown displacement reaching 600 m and eastward tilting at the bottoms of the grabens. Also, the structurally-controlled valleys are developing an eastward-running drainage system towards the oasis of Al-Kharj and capturing an older hydrologic system. Moreover, a 12-year period (1996–2008) of the SAR data was obtained to examine the average annual rate of southern Riyadh's anthropological sprawl, which is estimated at approximately 390 metres/year over the 12 years and constrained by geomorphological features towards the deformed area. DInSAR imageries show the primary results obtained from the 26 May 2004 and 31 Jan. 2005 pair of images, merged with 30 m resolution DEM-SRTM data for the arid region south of Riyadh to eliminate the influence of topography. DInSAR is applied in this study for its ability of detecting small displacements at the centimetre scale (1/2 wavelength). Although the DInSAR's coherence and phase imageries suggest a fairly stable region since the last tectonic and subsequent geomorphic events, erosional and artificial changes are observed, bounded within the valleys and depressions, primarily due to aeolian and fluvial processes and agriculture. It is highly recommended to preserve the area for sustainability and economy.

Mohamed Daoudi et al.

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