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Identifying Causes of Urban Differential Subsidence in the Vietnamese Mekong Delta by Combining InSAR and Field Observations

Wit, Kim de; Lexmond, Bente R.; Stouthamer, Esther; Neussner, Olaf; Dörr, Nils; Schenk, Andreas; Minderhoud, Philip S. J.

Abstract:
The Mekong delta, like many deltas around the world, is subsiding at a relatively high rate, predominately due to natural compaction and groundwater overexploitation. Land subsidence influences many urbanized areas in the delta. Loading, differences in infrastructural foundation depths, land-use history, and subsurface heterogeneity cause a high spatial variability in subsidence rates. While overall subsidence of a city increases its exposure to flooding and reduces the ability to drain excess surface water, differential subsidence results in damage to buildings and above-ground and underground infrastructure. However, the exact contribution of different processes driving differential subsidence within cities in the Mekong delta has not been quantified yet. In this study we aim to identify and quantify drivers of processes causing differential subsidence within three major cities in the Vietnamese Mekong delta: Can Tho, Ca Mau and Long Xuyen. Satellite-based PS-InSAR (Persistent Scatterer Interferometric Synthetic Aperture Radar) vertical velocity datasets were used to identify structures that moved at vertical velocities different from their surroundings. ... mehr

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Originalveröffentlichung
DOI: 10.3390/rs13020189
Zugehörige Institution(en) am KIT Fakultät für Bauingenieur-, Geo- und Umweltwissenschaften (BGU)
Institut für Photogrammetrie und Fernerkundung (IPF)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 07.01.2021
Sprache Englisch
Identifikator ISSN: 2072-4292
KITopen-ID: 1000128227
Erschienen in Remote sensing
Verlag MDPI
Band 13
Heft 2
Externe Relationen Siehe auch
Schlagwörter land subsidence; urban differential subsidence; PS-InSAR; building foundation depth; depth-dependent subsidence; Vietnamese Mekong delta
Nachgewiesen in Scopus
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