Third beach nourishment project with submarine sands along Emilia-Romagna coast: geomatic methods and first monitoring results

Vecchi, Enrica; Aguzzi, Margherita; Albertazzi, Carlo; Nigris, Nunzio De; Gandolfi, Stefano; Morelli, M.; Tavasci, Luca

doi:10.1007/s12210-020-00879-w

Cited by 8 publications

(17 citation statements)

References 9 publications

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“…Current estimates of VLM based on the regional high-precision levelling network, regularly monitored since 1983 by the Regional Agency for Prevention, Environment and Energy of the E-R region (ARPAE), indicate average subsidence rates in the order of 5 mm/year for the last 15 years, decreasing to 3-4 mm/year in the period 2011-2016 [55]; however, peak values in the order of about 20 mm/year are still locally observed in the Ravenna coastal tract. The Coastal Geodetic Network is now the base for the definition of the orthometric heights along the E-R coast [58], integrated with InSAR techniques and GNSS measurements. Recently, Montuori et al [59] integrating GNSS and multitemporal DInSAR techniques for the monitoring of land subsidence processes along the coastal plain, obtained average rates >3 mm/year, increasing to over 5 mm/year for Ravenna and some tracts along the SE coast.…”

Section: Study Areamentioning

confidence: 99%

“…In the E-R coastal area (and on a great portion of the Northern Adriatic coast, Italian side) subsidence is widespread and occurs at high rates [109], while vertical deformations caused by other phenomena as GIA are more than one order of magnitude smaller than subsidence that here dominates the VLM affecting RSL change [60,68,69,105,106,109]. Presently, different integrated techniques, such as high-resolution levelling, e.g., GNSS and InSAR, provide data on VLM with increasing accuracy [57,58]. However, the small size and short-lived variation of vertical deformation processes causes this information to be not always comparable/homogeneous.…”

Section: The Role Of Vertical Movements In Sea-level Determinationmentioning

confidence: 99%

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Sea-Level Change along the Emilia-Romagna Coast from Tide Gauge and Satellite Altimetry

2020

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Coastal flooding and retreat are markedly enhanced by sea-level rise. Thus, it is crucial to determine the sea-level variation at the local scale to support coastal hazard assessment and related management policies. In this work we focus on sea-level change along the Emilia-Romagna coast, a highly urbanized, 130 km-long belt facing the northern Adriatic Sea, by analyzing data from three tide gauges (with data records in the last 25–10 years) and related closest grid points from CMEMS monthly gridded satellite altimetry. The results reveal that the rate of sea-level rise observed by altimetry is coherent along the coast (2.8 ± 0.5 mm/year) for the period 1993–2019 and that a negative acceleration of −0.3 ± 0.1 mm/year is present, in contrast with the global scale. Rates resulting from tide gauge time series analysis diverge from these values mainly as a consequence of a large and heterogeneous rate of subsidence in the region. Over the common timespan, altimetry and tide gauge data show very high correlation, although their comparison suffers from the short overlapping period between the two data sets. Nevertheless, their combined use allows assessment of the recent (last 25 years) sea-level change along the Emilia-Romagna coast and to discuss the role of different interacting processes in the determination of the local sea level.

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Section: Study Areamentioning

confidence: 99%

Section: The Role Of Vertical Movements In Sea-level Determinationmentioning

confidence: 99%

Sea-Level Change along the Emilia-Romagna Coast from Tide Gauge and Satellite Altimetry

2020

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“…In 2016, a major beach nourishment was undertaken at the regional scale, placing about 212,000 m 3 of sand dredged from the offshore in a 1400 m long coastal stretch of southern Riccione (Figure 2a). Based on post-nourishment surveys conducted by Arpae, which included the undersea beach where some of the sand was displaced, it was estimated that 66% of the total fill volume remained on the beach after the first two years [29,30]. Moreover, as common practice before the winter season, large volumes of sediments are moved with trucks and excavators from the berm/intertidal zone (foreshore) toward the landward part of the beach.…”

Section: Commementioning

confidence: 99%

“…Combining uncertainties related both to the GNSS and to the echosounder, the variance in height estimation for each cell has been assumed as being equal to 5 cm to account for instrumental precision of the latter; the bias due to RTK was set to 1 cm. The overall associated uncertainty has been estimated according to [29], resulting in about 1560 m 3 equal to 1.04% in terms of volume uncertainty per square meter (m 3 /m 2 ).…”

Section: Dtm Geomorphologic Analysismentioning

confidence: 99%

Beach Monitoring and Morphological Response in the Presence of Coastal Defense Strategies at Riccione (Italy)

Romagnoli

Sistilli

Cantelli

et al. 2021

JMSE

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The coastal area at Riccione, in the southern Emilia-Romagna littoral region, is exposed to erosive processes, which are expected to be enhanced by climate change. The beach, mostly composed of fine sand, is maintained through various defense strategies, including frequent nourishment interventions for balancing the sediment deficit and other experimental solutions for reducing coastal erosion. Artificial reshaping of the beach and “common practices” in the sediment management redefine the beach morphology and the sediment redistribution almost continuously. These activities overlap each other and with the coastal dynamics, and this makes it very difficult to evaluate their effectiveness, as well as the role of natural processes on the beach morphological evolution. Topo-bathymetric and sedimentological monitoring of the beach has been carried out on a regular basis since 2000 by the Regional Agency for Prevention, Environment and Energy of Emilia-Romagna (Arpae). Further monitoring of the emerged and submerged beach has been carried out in 2019–2021 in the framework of the research project STIMARE, focusing on innovative strategies for coastal monitoring in relation with erosion risk. The aim of this study is to assess the coastal behavior at the interannual/seasonal scale in the southern coastal stretch of Riccione, where the adopted coastal defense strategies and management actions mostly control the morphological variations in the emerged and submerged beach besides the wave and current regime. The topo-bathymetric variations and erosion/accretion patterns provided by multitemporal monitoring have been related to natural processes and to anthropogenic activities. The morphological variations have been also assessed in volumetric terms in the different subzones of the beach, with the aim of better understanding the onshore/offshore sediment exchange in relation with nourishments and in the presence of protection structures. The effectiveness of the adopted interventions to combat erosion, and to cope with future climate change-related impacts, appears not fully successful in the presence of an overall sediment deficit at the coast. This demonstrates the need for repeated monitoring of the emerged and submerged beach in such a critical setting.

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“…In this case, the surveyed test points were those of the Coastal Geodetic Network (RGC), realized in 2016 thanks to the collaboration between the Coastal Monitoring Unit of regional agency for prevention, environment and energy of emilia-romagna (ARPAE) and the Department of Civil, Chemical and Environmental Engineering (DICAM) of the University of Bologna (Vecchi et al 2020). These benchmarks, located along the Adriatic coast, are used for local monitoring surveys and their coordinates are aligned to the official national reference system ETRS89-ETRF2000 (2008.0 epoch) (Gandolfi et al 2017a;Vecchi et al 2020). RGC monographs available on the ARPAE Cartographic Portal (ARPAE 2021), have been used as a reference for the following analysis.…”

Section: Field Testmentioning

confidence: 99%

Performance of Atlas GNSS Global Correction Service for High-Accuracy Positioning

2021

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In the last decade, a number of correction services for global navigation satellite systems (GNSS) precise positioning have been developed, mainly for offshore applications, based on a precise point positioning (PPP) real-time processing. These allow receiving corrections without the need for an internet connection or reference benchmarks around the survey area. In the paper, we tested the Atlas correction service implemented in a Stonex S900A machine (Monza, Italy), with the purpose to verify its performances under optimal operational conditions and in the practical case of a land survey on several benchmarks along the Adriatic coast. The data analysis focused on: accuracy with respect to the reference frame, repeatability of the coordinates considering short and long acquisition periods, time to initialize the survey, and reliability of the formal errors provided by the instrument. The system confirmed the declared performances in most cases and is shown to be a viable alternative to other GNSS techniques also for land surveys where no obstacles affect the sky visibility.

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Third beach nourishment project with submarine sands along Emilia-Romagna coast: geomatic methods and first monitoring results

Cited by 8 publications

References 9 publications

Sea-Level Change along the Emilia-Romagna Coast from Tide Gauge and Satellite Altimetry

Sea-Level Change along the Emilia-Romagna Coast from Tide Gauge and Satellite Altimetry

Beach Monitoring and Morphological Response in the Presence of Coastal Defense Strategies at Riccione (Italy)

Performance of Atlas GNSS Global Correction Service for High-Accuracy Positioning

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