1,721,271 research outputs found
Sviluppo, implementazione e validazione di una metodologia innovativa di previsione indiretta degli stati di mare nel lungo periodo
No full text. La presente memoria propone un metodo per caratterizzare il clima d’onda al largo di un paraggio attraverso la conoscenza della successione temporale degli stati di vento, introducendo i concetti di “Mare Reale Ricostruito” (MRR) e “Mare Ideale Ricostruito” (MIR). Il metodo è stato validato confrontando il mare ricostruito e il mare vero sulla scorta della conoscenza dei dati anemometrici ed ondametrici per un periodo di osservazione medio/lungo (luglio ’89 - dicembre 98) relativi al test case Mar Tirreno/località Ponza
INTERVENTI DI MITIGAZIONE DEL FENOMENO DI EROSIONE DELL’ARCO COSTIERO METAPONTINO: Analisi Meteomarina
No full textVulnerability assessment or preliminary flood risk mapping and management in coastal areas
Full text linkPlanning and management of coastal environment, both terrestrial and marine, is affected by several actions in environment resource conservation and improvement, paying specific attention to risk forecasting and preventing.
In such context the EU flood Directive 2007/60/EC, which requires Member States the assessment and management of flood risk, and the EU water framework Directive (2000/60/EC) are the key factors in the integrated river basin management to assure an efficient and rational use of resources.
Afterwards, coastal risk assessment and mapping is a propaedeutic phase to plan and manage coastal areas. In this work risk analysis refers to the results obtained by the combined application of coastal flooding and erosion risks in the activities carried out to prepare the Regional Coast Management Plan for the Ionian coast of Basilicata Region located in the south of Italy. In order to define the driving forces acting on the shore, high resolution lidar data, bathymetric information and wave climate statistics referred to different acquisition times are used. The systemic vulnerability estimation is achieved by composing both hazard factors combined in the Coastal Criticality Index depending on the assessment of Coastal Flood Index and Coastal Erosion Index based on morphologic and socio-economic variables
Temporary intervention for coastal risk mitigation with low environmental impact
No full textAs well known, the ionic coast of Basilicata (Southern Italy) is strongly affected by erosion processes inducing
severe critical condition for both urban areas and local tourism economic. Topographic/bathymetric information,
collected by different sources like multisource platforms, IGMI cartographic data, airborne and satellite imagery,
as well as echo-sound, clearly outline such processes staging from the early ’50 with an increasing rate observed
in the ’60-’80 period. These phenomena have different features and effects in both southern and northern parts of
the coastal area, between Sinni - Agri deltas and Basento - Bradano deltas respectively, compared to the central
littoral area, located between Agri - Cavone - Basento deltas. Such different effects are relevant in terms of
maritime vulnerability and shoreline changes sensitivity mainly due to the drastic reduction of sediment supply
from river catchments induced by human activities, land use changes, land defence interventions water resources
infrastructures and management interesting all the Lucanian river basins.
Further, in the last 15 years, coastal erosion produced critical effects on the Metaponto Lido area, located in the
northeast part of the littoral, and characterised by typical fine sandy beaches with a shoreline of about 6 km, gently
sloping off shore by 1-2 %, branded by the presence of 2 and 3 orders of natural bars. The urban area has a sea
side town village with a longshore promenade water front designed for rehabilitation and requalification of the
beach fruition.
The widespread presence of permanent and seasonal structures, built on the longshore sand dune close to the
foreshore, amplified the wave actions increasing the local erosion rates.
The severe winter and spring sea storms in 2008 and 2009, emphasized the erosion intensity and trend until to
induce structural falls and partial collapse of the promenade, changing the scenario from “ordinary” environmental
risk up to civil protection setting due to the increasing coastal inundation risk. Further, during the spring 2009, a
simply beach nourishment, of about 50.000 m3, was easily performed with any stabilization structures such as
groins or breakwaters, suddenly eroded during the winter season 2009-2010.
In such scenario, the Department of Environmental Engineering and Physics (DIFA) of Basilicata University and
the Regional Authority proposed an experimental temporary intervention with a low environmental impact able to
mitigate and contrast the coastal risk. The intervention aimed to reduce the spring storm damage, for both town
safety and beach erosion, arranging a “no structural” stone barrier all shore long periodically moved out-beach
once the storm set down. Such maintenance, performed during the spring season 2010 produced a natural beach
nourishment with a sensitive average coastline advancing. The temporary intervention allowed the reduction of
fill sand volume for the summer 2010 re-nourishment at 5.000 m3, to be located only in few parts of the interested
littoral with extremely positive effect for public finance and local tourism economy. The maintenance activities
have been performed even during the spring season 2011 employing the same used materials and obtaining a
positive effect on the beach extension too. The temporary character of the intervention, of course, does not avoid
the structural works to be further achieved for coastal protection and erosion mitigation
VULNERABILITY ASSESSMENT FOR PRELIMINARY FLOOD RISK MAPPING AND MANAGEMENT IN COASTAL AREAS
Full text linkPlanning and management of coastal environment, both terrestrial and marine, is affected by several actions in environment resource conservation and improvement paying specific attention to risk forecasting and preventing.
In such context the EU flood Directive 2007/60/EC, which requires Member States the assessment and management of flood risk, and the EU water framework Directive (2000/60/EC) are the key factors in the integrated river basin management to assure an efficient and rational use of resources.
Afterwards, coastal risk assessment and mapping is a propaedeutic phase to plan and manage coastal areas. In this work risk analysis refers to the results obtained by the combined application of coastal flooding and erosion risks in the activities carried out to prepare Regional Coast Management Plan for the Ionian coast of Basilicata Region located in the south of Italy. In order to define the driving forces acting on the shore, high resolution lidar data, bathymetric information and wave climate statistics acquired by meteorological analyses on wind field data referred to different acquisition times are used. The systemic vulnerability estimation is achieved by composing both hazard factors combined in the Criticality Coastal Index depending on of the assessment of Coastal Flood Index and Coastal Erosion Index based on morphologic and socio-economic variables
Analisi locale dell'interazione foce fluviale-infrastruttura portuale
Full text linkViene proposta un’analisi numerica locale indirizzata alla valutazione dell’interazione foce fluviale-opera portuale in termini di erosione/sedimentazione propedeutica all’individuazione delle tendenze evolutive della linea di costa a supporto della definizione di possibili interventi di mitigazione. Lo studio è condotto con riferimento all’infrastruttura portuale turistica realizzata in prossimità della foce del fiume Basento nell’arco ionico-lucano. L’analisi ha preso in considerazione le configurazioni “ante-operam”, immediatamente prima della costruzione dell’infrastruttura, e “post-operam” relativamente a tempi diversi. Per la definizione del dominio computazionale e delle condizioni iniziali ed al contorno, sono stati impiegati dati meteomarini, rilievi Lidar e batimetrici corrispondenti ai periodi temporali distinti a cui riferire le simulazioni. I prodotti intermedi e finali della modellazione, sono stati raffrontati a serie annuali di immagini da foto aeree che, seppure nei limiti di una maggiore rispondenza qualitativa piuttosto che quantitativa del processo in esame, hanno confortato sulla bontà del risultato
INTERVENTI DI MITIGAZIONE DEL FENOMENO DI EROSIONE DELL’ARCO COSTIERO METAPONTINO: Interventi strutturali – Modellazione numerica
No full text
Sviluppo di una metodologia integrata di previsione degli stati di mare nel lungo periodo
No full textSi propone una nuova metodologia di previsione indiretta degli stati di mare basata sul metodo dell’altezza d’onda significativa (SMB Method) rivisitato ed integrato dei concetti probabilistici propri della teoria del Mare Equivalente.
A partire da una possibile ricostruzione dei soli stati di mare vivo, l’approccio proposto consente di caratterizzare il clima d’onda, al largo di un paraggio, attraverso la definizione e valutazione di un Mare Reale Ricostruito (MRR) e dell’associato Mare Ideale Ricostruito (MIR). Il metodo è stato validato su dati osservati mediante il confronto tra il mare ricostruito ed il mare reale sulla scorta della conoscenza dei dati anemometrici ed ondametrici per un periodo di osservazione medio/lungo relativi alla medesima località
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