Comment on “Recent subsidence of the Venice Lagoon from continuous GPS and interferometric synthetic aperture radar” by Y. Bock, S. Wdowinski, A. Ferretti, F. Novali, and A. Fumagalli

Teatini, Pietro; Tosi, Luigi; Strozzi, Tazio

doi:10.1029/2012gc004191

Cited by 15 publications

(10 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…X-band and L-band interferometric solutions have been calibrated using the ground velocities recorded by the CGPS stations (ODEZ, VEN1, PTO1 and TRVS, VEN1, PTO1) to mitigate the so-called flattening problem, i.e., the slight phase tilt resulting by the inaccuracy in estimation of the orbital baseline due to the not perfect knowledge of the satellite positions [14,41]. We have preferred to use TRVS instead of ODEZ for ALOS-PALSAR as the time period of the former superposes with the interferometric time interval.…”

Section: Calibration and Validationmentioning

confidence: 99%

Combining L- and X-Band SAR Interferometry to Assess Ground Displacements in Heterogeneous Coastal Environments: The Po River Delta and Venice Lagoon, Italy

et al. 2016

View full text Add to dashboard Cite

From leveling to SAR-based interferometry, the monitoring of land subsidence in coastal transitional environments significantly improved. However, the simultaneous assessment of the ground movements in these peculiar environments is still challenging. This is due to the presence of relatively small built-up zones and infrastructures, e.g., coastal infrastructures, bridges, and river embankments, within large natural or rural lands, e.g., river deltas, lagoons, and farmland. In this paper we present a multi-band SAR methodology to integrate COSMO-SkyMed and ALOS-PALSAR images. The method consists of a proper combination of the very high-resolution X-band Persistent Scatterer Interferometry (PSI), which achieves high-density and precise measurements on single structures and constructed areas, with L-band Short-Baseline SAR Interferometry (SBAS), properly implemented to raise its effectiveness in retrieving information in vegetated and wet zones. The combined methodology is applied on the Po River Delta and Venice coastland, Northern Italy, using 16 ALOS-PALSAR and 31 COSMO-SkyMed images covering the period between 2007 and 2011. After a proper calibration of the single PSI and SBAS solution using available GPS records, the datasets have been combined at both the regional and local scales. The measured displacements range from~0 mm/yr down to´35 mm/yr. The results reveal the variable pattern of the subsidence characterizing the more natural and rural environments without losing the accuracy in quantifying the sinking of urban areas and infrastructures. Moreover, they allow improving the interpretation of the natural and anthropogenic processes responsible for the ongoing subsidence.

show abstract

Section: Calibration and Validationmentioning

confidence: 99%

Combining L- and X-Band SAR Interferometry to Assess Ground Displacements in Heterogeneous Coastal Environments: The Po River Delta and Venice Lagoon, Italy

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Usually from medium to small-scale investigations (in the order of 10 3 10 km 2 ), one reference point suffices for the calibration [e.g., Brooks et al, 2007]. Conversely, for large-scale SAR investigations, several reference measurements evenly distributed over the area of interest are required to condition the interferometric outcome [e.g., Teatini et al, 2012], since an inaccurate estimate of the orbital baseline results from imperfect knowledge of the satellite position in a phase tilt. The ''right solution'' in terms of SAR average velocity is possibly rotated on a slightly inclined plane, with the relative displacement rate for radar reflectors some tens of kilometers apart, with an uncertainty of 1-3 mm/yr [Strozzi et al, 2001].…”

Section: 1002/2014wr016841mentioning

confidence: 99%

Geomechanics of subsurface water withdrawal and injection

Gambolati

Teatini

2015

Water Resources Research

132

View full text Add to dashboard Cite

Land subsidence and uplift, ground ruptures, and induced seismicity are the principal geomechanic effects of groundwater withdrawal and injection. The major environmental consequence of groundwater pumping is anthropogenic land subsidence. The first observation concerning land settlement linked to subsurface processes was made in 1926 by the American geologists Pratt and Johnson, who wrote that ''the cause of subsidence is to be found in the extensive extraction of fluid from beneath the affected area.'' Since then, impressive progress has been made in terms of: (a) recognizing the basic hydrologic and geomechanic principles underlying the occurrence; (b) measuring aquifer compaction and ground displacements, both vertical and horizontal; (c) modeling and predicting the past and future event; and (d) mitigating environmental impact through aquifer recharge and/or surface water injection. The first milestone in the theory of pumped aquifer consolidation was reached in 1923 by Terzaghi, who introduced the principle of ''effective intergranular stress.'' In the early 1970s, the emerging computer technology facilitated development of the first mathematical model of the subsidence of Venice, made by Gambolati and Freeze. Since then, the comprehension, measuring, and simulation of the occurrence have improved dramatically. More challenging today are the issues of ground ruptures and induced/ triggered seismicity, which call for a shift from the classical continuum approach to discontinuous mechanics. Although well known for decades, anthropogenic land subsidence is still threatening large urban centers and deltaic areas worldwide, such as Bangkok, Jakarta, and Mexico City, at rates in the order of 10 cm/yr.

show abstract

“… Teatini et al [2012b] also object to our speculation with respect to their earlier work (item 4). In Bock et al [2012, paragraph 17] we wrote: “Our results differ from the results of Teatini et al [2005, 2007] who indicated a more stable situation in the city.…”

mentioning

confidence: 82%

Reply to comment by P. Teatini et al. on “Recent subsidence of the Venice Lagoon from continuous GPS and interferometric synthetic aperture radar”

Bock

Wdowinski

Ferretti

et al. 2012

Geochem Geophys Geosyst

View full text Add to dashboard Cite

Comment on “Recent subsidence of the Venice Lagoon from continuous GPS and interferometric synthetic aperture radar” by Y. Bock, S. Wdowinski, A. Ferretti, F. Novali, and A. Fumagalli

Cited by 15 publications

References 25 publications

Combining L- and X-Band SAR Interferometry to Assess Ground Displacements in Heterogeneous Coastal Environments: The Po River Delta and Venice Lagoon, Italy

Combining L- and X-Band SAR Interferometry to Assess Ground Displacements in Heterogeneous Coastal Environments: The Po River Delta and Venice Lagoon, Italy

Geomechanics of subsurface water withdrawal and injection

Reply to comment by P. Teatini et al. on “Recent subsidence of the Venice Lagoon from continuous GPS and interferometric synthetic aperture radar”

Contact Info

Product

Resources

About