Estimation of land subsidence in deltaic areas through differential SAR interferometry: the Po River Delta case study (Northeast Italy)

Fiaschi, Simone; Fabris, Massimo; Floris, Mario; Achilli, Vladimiro

doi:10.1080/01431161.2018.1490977

Cited by 32 publications

(51 citation statements)

References 58 publications

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“…These last data clearly show the benefits gained by halting extraction. Subsequently, the rate decreased still further: recent studies (geometric levelling and GPS) have shown that land subsidence, albeit reduced, is still ongoing (Baldi et al 2009;Cenni et al 2013;Tosi et al 2016;Fiaschi et al 2018). Most of the PRD now lies below sea level: its characteristic shape, with elevated borders seawards and an immense depression in the centre, is due to the exaggerated lengthening of the deltaic branches, anthropogenic stabilization of the hydrographical network, and land subsidence (Simeoni and Corbau 2008).…”

Section: Prd and Land Subsidencementioning

confidence: 99%

“…Multi-temporal trend of emerged surfaces in coastal area of PRD was connect also with land subsidence rates values available for the last 25 years; Fiaschi et al (2018) have used SAR methodology to obtain land subsidence rates of the area: they have Their results, validated using ground-based data (levelling and CGPS), provides land subsidence rates in the coastal area in the order of 1 cm along the line of sight (LOS) of satellites. In the last analysed period (2014-2017), using Sentinel-1A images, the obtained results, along the LOS of satellite, are shown in Figure 6 (data and results were adequately discussed by Fiaschi et al 2018). The average land subsidence velocities of the resulting A-DInSAR points along the coastline for the three datasets (ERS-1/2, ENVISAT and Sentinel 1-A), together with the emerged surfaces of the six sub-areas with complete data from 1992 to 2014 (due to continuity of data in the 1999 photogrammetric survey, Figure 2) are shown in Figure 7.…”

Section: Surface Balance and Accuracymentioning

confidence: 99%

“…Several methods can be used to study ground deformations such as global positioning systems (GPS or later GNSSglobal navigation satellite system), both continuous (CGPS) and differential (DGPS) (Bitelli et al 2000;Baldi et al 2009;Cenni et al 2013), space-borne observation techniques based on synthetic aperture radar (SAR), interferometry (InSAR, with differential InSAR -DInSAR and advanced differential A-DInSAR that allow to maximize the potential of this technique and permit time series analysis) (Bock et al 2012;Teatini et al 2012;Costantini et al 2017;Fiaschi et al 2018), satellite images (acquired with various kinds of sensors, with mono and/ or stereo ground coverage), classical topographic measurements and repeated geometric levelling on benchmarks (Barbarella et al 1990;Bondesan et al 1997;Fabris et al 2014;Hung et al 2018), light detection and ranging (LiDAR) with airborne laser scanning (ALS) approach (Fabris et al 2010;Marsella et al 2012) and aerial digital photogrammetry (Baldi et al 2005;Fabris and Pesci 2005;Baldi et al 2008aBaldi et al , 2008b. For limited areas, also unmanned aerial vehicle (UAV) (Mancini et al 2013) and terrestrial laser scanning (TLS) (Pesci et al 2007(Pesci et al , 2013 systems can successfully be used.…”

Section: Introductionmentioning

confidence: 99%

“…Many authors, using different techniques, have study land subsidence and coastline changes in PRD in the past (Zambon 1967;Caputo et al 1970Caputo et al , 1972Dal Cin 1983; Arca and Beretta 1985) and nowadays (Bock et al 2012;Tosi et al 2016;Fiaschi et al 2018), but no author have perform studies of emerged surfaces trend connected with land subsidence rates values in this area.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Coastline evolution of the Po River Delta (Italy) by archival multi-temporal digital photogrammetry

Fabris

2019

Geomatics, Natural Hazards and Risk

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Ground deformation areas can be monitored with geomatic methodologies which provide high-precision and high-resolution data. One example is digital aerial photogrammetry, which can be used to reconstruct ground deformations over long periods (80-90 years) with multi-temporal surveys. This technique was used to survey the planimetric deformations of the Po River Delta (PRD), characterized in the past by considerable land subsidence due to intensive pumping of methane water from 1938 to 1961. In the last few decades, land subsidence has been greatly reduced, but is still high compared with natural values, and has influenced the coastline of areas not protected by embankments. In this work, multi-temporal digital photogrammetry was used to study the evolution of the PRD coastline from 1944 to 2014 in the course of seven photogrammetric surveys (1944, 1955, 1962, 1977, 1999, 2008 and 2014). Results of the multi-temporal analysis were correlated with available subsidence rates (from levelling, for the past, and from synthetic aperture radar, for the period 1992-2017): this study show agreement between land subsidence and areas submerged by the sea, although they are also greatly influenced by human activities and sea level rise which increasingly exposing the area to the risk of widespread flooding. ARTICLE HISTORY

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Section: Prd and Land Subsidencementioning

confidence: 99%

Section: Surface Balance and Accuracymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Coastline evolution of the Po River Delta (Italy) by archival multi-temporal digital photogrammetry

Fabris

2019

Geomatics, Natural Hazards and Risk

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“…If close-range geomatics techniques are useful for the survey and investigation of civil engineering constructions, such as buildings, bridges and water towers [1], satellite remote sensing is traditionally suitable to support studies on geographic areas, e.g., urban growth effects [2,3], glacier inventory [4,5], desertification [6,7], grassland monitoring [8,9], burned area detection [10,11], seismic damage assessment [12,13], land deformations monitoring aims-landslides [14], land subsidence [15], coastal changes [16], etc. However, a detailed investigation of the Earth's surface and land cover can be performed using Very High Resolution (VHR) satellite images, characterised by pixel dimension of panchromatic (PAN) data equal or less than 1 m. Generally, VHR sensors carried on a satellite can capture also multispectral (MS) images that have a lower resolution than PAN [17,18].…”

Section: Introductionmentioning

confidence: 99%

Automation of Pan-Sharpening Methods for Pléiades Images Using GIS Basic Functions

2021

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Pan-sharpening methods allow the transfer of higher resolution panchromatic images to multispectral ones concerning the same scene. Different approaches are available in the literature, and only a part of these approaches is included in remote sensing software for automatic application. In addition, the quality of the results supplied by a specific method varies according to the characteristics of the scene; for consequence, different algorithms must be compared to find the best performing one. Nevertheless, pan-sharpening methods can be applied using GIS basic functions in the absence of specific pan-sharpening tools, but this operation is expensive and time-consuming. This paper aims to explain the approach implemented in Quantum GIS (QGIS) for automatic pan-sharpening of Pléiades images. The experiments are carried out on data concerning the Greek island named Lesbo. In total, 14 different pan-sharpening methods are applied to reduce pixel dimensions of the four multispectral bands from 2 m to 0.5 m. The automatic procedure involves basic functions already included in GIS software; it also permits the evaluation of the quality of the resulting images supplying the values of appropriate indices. The results demonstrate that the approach provides the user with the highest performing method every time, so the best possible fused products are obtained with minimal effort in a reduced timeframe.

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Evolution of wetlands in the northern part of the Po Delta: The experience of unmanaged realignments

Brunetta,

Ciavola

2024

Earth Surf Processes Landf

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It is increasingly recognised that nature‐based solutions in coastal ecosystems provide significant services compared to hard engineering measures. Several restoration projects are now being conducted worldwide to protect coastlines against flood risk and improve the ecosystems' quality. In the case of river deltas, managed realignment through levee breaching is becoming a recognised strategy for coastal wetland restoration. This study focusses on the formation of new wetlands in the Po River Delta after several natural dyke failures that occurred during the last century, when a large part of the land was abandoned and became wetlands. An historical review was performed to quantify the variation of the marsh extent in time developed after natural levee breaching in the easternmost lagoons of the delta and to understand the processes that determined their evolution. The analyses were based on orthophotos from the 1950s to the present‐day integrated with tidal records, water and sediment discharge records, and GPS survey for vegetation distribution. The review indicated that, between the 1950s and 1980s, anthropisation and natural processes caused a strong decline in marsh extent, thus leading to the recent shape of the lagoons. Several breaches and inlets were developed because of a combination of human intervention and erosive processes, and new tidal systems were born. Three main depositional areas connecting the main river branches were identified in three separated lagoons of the delta. These lagoons presented a ‘crevasse splay’ type of deposition which allowed the development of new tidal flats and, in certain cases, of large freshwater marsh systems within less than 8 years after the breach. The newly formed wetland systems (>100 ha) demonstrate the ability of the Po River Delta to build new wetlands, also during periods of human‐induced sediment starvation and high rates of subsidence, suggesting that further levee breaching should be exploited to favour marsh recovery.

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Estimation of land subsidence in deltaic areas through differential SAR interferometry: the Po River Delta case study (Northeast Italy)

Cited by 32 publications

References 58 publications

Coastline evolution of the Po River Delta (Italy) by archival multi-temporal digital photogrammetry

Coastline evolution of the Po River Delta (Italy) by archival multi-temporal digital photogrammetry

Automation of Pan-Sharpening Methods for Pléiades Images Using GIS Basic Functions

Evolution of wetlands in the northern part of the Po Delta: The experience of unmanaged realignments

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