Deformational behaviours of alluvial units detected by advanced radar interferometry in the vega media of the segura river, southeast spain

Abstract

Abstract:It is widely known that differential land subsidence in a valley significantly controls its fluvial dynamics. Nevertheless, major uncertainty exists about the way in which alluvial forms respond to this process. In this study, morphological and lithostratigraphic data have been combined with Advanced Differential Interferometry (A-DInSAR) to detect changes in alluvial landform elevations and to verify the existence of a differential subsidence pattern influenced by active sedimentary dynamics. For this purpose, the middle reach of the Segura River valley (Vega Media of the Segura River, VMSR), in south-east Spain, was chosen as the study area. The VMSR is an alluvial area affected by subsidence processes in close conjunction with depositional conditions, ground-water withdrawals and faults. A high scale mapping of the main younger sedimentary units was carried out by combining multi-temporal aerial photographs, high resolution DEMs derived from LIDAR data, GNSS data and field work. In addition, lithostratigraphic descriptions were obtained from geotechnical drilling and trenching. Finally, ground surface displacements, measured using A-DInSAR for the periods 1995-2005 and 2004-2008,

Review of satellite radar interferometry for subsidence analysis

“…Both piezometric level evolution (Dang et al, 2014), pumping wells location (Tomas et al, 2011) and water extraction rates (Cigna and Tapete, 2021b) are included in the second group of information. Also geological data encompass a wide spectrum of information, from geomorphological mapping Floris et al, 2019), details on the geological (Castellazzi et al, 2016a;Goorabi et al, 2020), tectonic (Woppelmann et al, 2013;Zhao et al, 2009a) and lithostratigraphic setting (Conesa-Garcia et al, 2016;Stramondo et al, 2008) to geotechnical investigations (Herrera et al, 2009b;Khorrami et al, 2019).…”

“…Leveling (Hung et al, 2011;Karila et al, 2013;Sarychikhina et al, 2011;Zhou et al, 2003); continuous GPS (Bock et al, 2012), periodically surveyed GPS (Bejar-Pizarro et al, 2016) and adoption of common data frame (Hu et al, 2019a;Miller et al, 2017); GNSS (Del Soldato et al, 2018;Farolfi et al, 2019;Yalvac, 2020); extensometer ( Buckley et al, 2003;Calderhead et al, 2010); tide gauge (Carbognin et al, 2004;Di Paola et al, 2018) and altimetry (Catalao et al, 2020;Ma et al, 2017); pixel-offset (Chen et al, 2015a;Fan et al, 2021;Yang et al, 2017a). Field validation (Jung et al, 2007;Tomás et al, 2012) Comparison Piezometric level (Bui et al, 2021;Dang et al, 2014;Gao et al, 2018), pumping wells location (Tomas et al, 2011), water extraction rates (Cigna and Tapete, 2021b); geomorphological mapping Floris et al, 2019), geological ( Castellazzi et al, 2016a;Goorabi et al, 2020;Terranova et al, 2015), tectonic (Woppelmann et al, 2013;Zhao et al, 2009a) and lithostratigraphic setting (Conesa-Garcia et al, 2016;Stramondo et al, 2008); geotechnical investigations (Herrera et al, 2009b;Khorrami et al, 2019...…”