In:
Proceedings of the International Association of Hydrological Sciences, Copernicus GmbH, Vol. 382 ( 2020-04-22), p. 39-44
Abstract:
Abstract. The analysis of the vertical movements of the soil in the
Po River plane of the Emilia-Romagna Region (Italy) was updated through an
interferometric analysis referred to the 2011–2016 time-span. This activity
is a continuation of previous studies on the state of knowledge of vertical
soil movements in the same area, analyzed firstly by levelling and GNSS and
more recently by SAR interferometry for the periods 1992–2000, 2002–2006,
2006–2011, on behalf of the Emilia-Romagna Region. The survey area analysed
was approximately 13 300 km2, which corresponds to the territory
of the regional plain. The interferometric dataset was calibrated through
the use of velocity time series of several permanent GNSS stations. Among
the 36 stations analysed, 22 were included in the study area: 16 were used
for the calibration and 6 as check points). The velocities required for the
calibration of the SAR analysis were calculated in the period following the
important seismic events that struck the territory of the Emilia Romagna
Region in May 2012. The interferometric analysis was carried out by TRE
ALTAMIRA using the SqueeSAR™ technology. In particular, in
order to update the interferometric dataset to 2016, it was necessary to
perform a joint processing of the available RADARSAT-1 data and of the data
acquired by the RADARSAT-2 satellite using a specific operating mode of the
SqueeSAR™ algorithm known as stitching; this approach allowed
the joint processing of images acquired in the same geometry by these two
satellites. The study of the time series of the GNSS permanent stations used
to provide the velocity datum to the interferometric analysis, is described,
and the results of the SqueeSAR™ interferometric processing are
reported. Statistical analyses on the spatial distribution and the type of
scatterers have been performed during the screening and validation
procedures of the dataset, and for the identification and removal of the
outliers. Finally, the resulting map is described in order to analyse the
measured soil movements with respect to the results obtained in past
analyses, and the possible geological and human-induced causes, which could
have produced them.
Type of Medium:
Online Resource
ISSN:
2199-899X
DOI:
10.5194/piahs-382-39-2020
Language:
English
Publisher:
Copernicus GmbH
Publication Date:
2020
detail.hit.zdb_id:
2827925-6
Permalink