1,721,544 research outputs found
Soil thermal behavior in different moisture condition: an overview of ITER project from laboratory to field test monitoring
No full textThe thermal properties of soils can be considered one of the most important parameters for many engineering projects designing. In detail, the thermal conductivity plays a fundamental role when dimensioning ground heat exchangers, especially very shallow geothermal (VGS) systems, interesting the first 2 m of depth from the ground level. However, the determination of heat transfer in soils is difficult to estimate, because depends on several factors, including, among others, particle size, density, water content, mineralogy composition, ground temperature, organic matter.
The performance of a VSG system, as horizontal collectors or special forms, is strongly correlated to the kind of sediment at disposal and suddenly decreases in case of dry-unsaturated conditions in the surrounding soil. Therefore, a better knowledge of the relationship between thermal conductivity and water content is required for understanding the VSG systems behavior in saturated and unsaturated conditions.
Key challenge of ITER Project, funded by European Union, is to understand how to enhance the heat transfer of the sediments surrounding the pipes, taking into account the interactions between the soil, the horizontal heat exchangers and the surrounding environment.
In order to obtain reliable data for modelling, an interdisciplinary approach is used. In laboratory the physical-thermal properties of more than 15 soil mixtures, consisting in (i) natural soil, (ii) pure sand and (iii) mixtures of pure sand and clay additives, have been tested under different water content percentages and different consolidation degree. Then the same parameters are monitored in the project case study, in Eltersdorf, (Germany), where five helix collectors are installed in horizontal trenches filled in with five different mixtures already tested in laboratory. In addition, a monitoring system allows to record every 15 minutes, by means of devoted sensors, values related to ground temperature (undisturbed, inside and outside each helix), fluid temperature and flow running in the collectors, volumetric water content at 20 and 60 cm depth. Moreover, a meteorological station provides climatic data acquisition as rainfall, wind speed, relative humidity and air temperature.
The main results achieved until now are useful for future modeling because shed new light (i) on the differences between data collected in laboratory and in the field and (ii) on the influence of the technical solution adopted in situ to fill in the trenches, able to create a non-homogeneous distribution of the soil bodies around the helix.Abstract
5th International Conference Novel Methods for Subsurface Characterization and Monitoring: From Theory to Practice, NovCare 2017, Dresden, Germany, 06-09.06.201
The Early Career Hydrogeologists' Network (ECHN-IAH): empowering young hydrogeologists at a national and international level
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Present and future challenges of urban systems affected by seawater and its intrusion: The case of Venice, Italy
No full textLe falde freatiche dell'entroterra veneziano: sede di acque dolci o di acque salate?: relazioni acque superficiali-acque sotterranee-laguna
No full textIntrusione Salina
No full textAGIP, 1994. Acque dolci sotterranee, Inventario dei dati raccolti dall’Agip durante la ricerca di idrocarburi in Italia dal 1971 al 1990. Roma, Italy, Agip S.p.A., 515 pp.
Beaty, R.D., Kerber J.D., 1993. Concepts, Instrumentation and Techniques in Atomic Absorption Spectrophotometry, Perkin-Elmer Corporation, Norwalk
Benvenuti, G., Norinelli, A., Zambrano, R., 1973. Contributo alla conoscenza del sottosuolo dell’area circumlagunare veneta mediante sondaggi elettrici verticali. Bollettino di Geofisica Teorica e Applicata XV (57), 23-38.
Benvenuti, G., Norinelli A., 1974. Studio geofisico di interfaccia acqua dolce- acqua marina nell’area circumlagunare veneta e nella zona delle sorgenti del Chidro (Taranto), Memorie degli Istituti di Geologia e Mineralogia dell’Università di Padova, 1974, vol. XXXI, 1-16
Bixio, A.C., Putti, M., Tosi, L., Carbognin, L., Gambolati, G., 1998. Finite Element Modeling of Salt water Intrusion in the Venice Aquifer System. In: Computational Methods in Surface and Ground Water Transport, 2, 193-200, Burganos V.N. et al. (Eds.), Suthampton, UK.
Bondesan, A., Meneghel, M., 2004. Geomorfologia della Provincia di Venezia: Note Illustrative della Carta Geomorfologica della Provincia di Venezia, Esedra Editrice
Brambati, A., Carbognin, L., Quaia, T., Teatini, P., Tosi, L., 2003. The Lagoon of Venice: geological setting, evolution and land subsidence. Episodes, 26(3), 264-268.
Carbognin, L., Tosi, L., 2003. Il Progetto ISES per l’analisi dei processi di intrusione salina e subsidenza nei territori meridionali delle Province di Padova e Venezia. Grafiche Erredici Padova (Italy), 95 pp.
Carbognin, L., P. Teatini & L. Tosi, 2004, Eustasy and land subsidence in the Venice Lagoon at the beginning of the new millennium. Journal of Marine Systems, 51, 345-353.
Carbognin L., Teatini P. & L. Tosi, 2005. Land Subsidence in the venetian area: known and recent aspects. Giornale di Geologia Applicata 1,2005, 5–11, doi: 10.1474/GGA.2005-01.0-01.0001.
Carbognin, L., Teatini, P., Tomasin, A., Tosi, L., 2009. Global change and relative sea level rise at Venice: what impact in term of flooding. Climate Dynamics, doi:10.1007/s00382-009-0617-5.
Clark I., Fritz P. 1997. Environmental Isotopes in Hydrogeology, Lewis Publisher, 1997
Cozzi R., Protti P., Raro T. 1987. Analisi chimica: Moderni metodi strumentali, ESU Spa
Craig H. 1961. Isotopic variations in meteoric waters, Science 133, 1702-1703
De Franco, R., Biella, G., Tosi, L., Teatini, P., Lozej, A., Chiozzotto, B., Giada, M., Rizzetto, F., Claude, C., Mayer, A., Bassan, V., Gasparetto-Stori, G., 2009. Monitoring the saltwater intrusion by time lapse electrical resistivity tomography: The Chioggia test site (Venice Lagoon, Italy). Journal of Applied Geophysics, 69, 117-130.
Di Sipio E., Galgaro A., Zuppi G.M. and Zangheri P., 2005. Detecting the origin of salt water contamination in groundwater in a lagoon area by the combined use of geophysical and geochemical tools: the example of the southern Venice Lagoon mainland. Groundwater and saline intrusion. Proceedings of the 18th Salt Water Intrusion Meeting. Instituto Geológico y Minero de España, Madrid, Spain, Hidrogeología y Aguas Subterráneas Series, 15, 373-384
Di Sipio, E., Galgaro, A., Zuppi, G. M., 2006. New geophysical knowledge of groundwater systems in Venice estuarine environment. Estuarine, Coastal and Shelf Science 66, 6-12.
Di Sipio, E., Galgaro, A., Zuppi, G. M., 2007. Contaminazione salina nei sistemi acquiferi dell’entroterra meridionale della Laguna di Venezia, Giornale di Geologia Applicata, 6, 01-08.
Di Sipio, E., Galgaro, A.,Rapaglia J., Zuppi G.M., 2008. Salt water contamination on Venice Lagoon mainland: new evaluation of origin, extension and dynamics. Proceedings 1st SWIM-SWICA Int. Joint Saltwater Intrusion Conference, , Cagliari-Chia Laguna, Italy, 3ESSE Commerciale, (CA), 195-204
Galgaro, A., Finzi, E., Tosi, L., 2000, An experiment on a sand-dune environment in Southern Venetian coast based on GPR, VES and documentary evidence. Annals of Geophysics, 43(2), 289-295.
Gattacceca, J. C., Vallet-Coulomb, C., Mayer, A., Claude, C., Radakovitch, O., Conchetto, E., Hamelin, B., 2009. Isotopic and geochemical characterization of salinization in the shallow aquifers of a reclaimed subsiding zone: The southern Venice Lagoon coastland. Journal of Hydrology 378 (1-2), 46-61.
Gonfiantini R., Stichler W., Rozanski K., 1995. Standards and intercomparison materials distributed by the International Atomic Energy Agency for stable isotope measurements. Reference and Intercomparison Material of Stable Isotopes of Light Elements. IAEA-TECDOC-825, Vienna, 13-29
Norinelli A., 1986. Elementi di geofisica applicata, Patron Editore, Bologna
Oude Essink G.H.P., 2001. Improving fresh groundwater supply problems and solutions, Ocean & Coastal Management, 44, 2001, 429-449
Rapaglia J., Di Sipio E., Bokuniewicz H., Zuppi G.M., Zaggia L., Galgaro A., Beck A., 2010. Groundwater connections under a barrier beach: a case study in the Venice Lagoon, Continental Shelf Research, 30 (2), 119-126
Reynolds J.M., 2001. An introduction to applied and environmental geophysics, John Wiley & Sons Editors
Rizzetto, F., Tosi, L., Carbognin, L., Bonardi, M., Teatini, P., 2003. Geomorphological setting and related hydrogeological implications of the coastal plain south of the Venice Lagoon (Italy). In: Servat, E., et al. (eds.), Hydrology of the Mediterranean and Semiarid Regions, IAHS Publ. n. 278, Wallingford, UK. pp. 463-470.
Teatini, P., Tosi, L., Strozzi, T., Carbognin, L., Wegmüller, U., Rizzetto, F., 2005. Mapping regional land displacements in the Venice coastland by an integrated monitoring system. Remote Sensing of Environment 98, 403-413.
Tosi, L., Teatini, P., Carbognin, L., Brancolini, G., 2009a. Using high resolution data to reveal depth-dependent mechanisms that drive land subsidence: The Venice coast, Italy, Tectonophysics, 474(1-2), 271-284.
Viezzoli, A., Tosi, L., Teatini, P., Silvestri, S., 2010. Surface water-groundwater exchange in transitional coastal environments by airborne electromagnetics: the Venice Lagoon example. Geophysical Research Letters, 37, L01402.
Vandenbohede A., Lebbe L., 2006. Occurrence of salt water above fresh water in dynamic equilibrium in a coastal groundwater flow system near De Panne, Belgium, Hydrogeology Journal, 14, 2006, 462-472.
Zezza F., Di Sipio E., 2008. Salt Water Intrusion in The Shallow Aquifers of Venice, Proceeding of the 20th Salt Water Intrusion Meeting SWIM, Naples, Florida, USA, June 23-27, 2008, 59-62
Zezza F., 2008: Geologia, proprietà e deformazione dei terreni del centro storico di Venezia. Secondo Convegno 'La riqualificazione delle città e dei territori', Geologia e Progettazione nel centro storico di Venezia' in Quaderni IUAV n. 54 pp. 9-41. Ed. Il Poligrafo, Padova
Zuppi G.M., Sacchi E. 2004. Dynamic processes in the Venice Region outlined by environmental isotopes. Isotopes in environmental and health studies, 40, 35-44Published531-5506A. Monitoraggio ambientale, sicurezza e territorioope
Factors Influencing the Thermal Efficiency of Horizontal Ground Heat Exchangers
Full text linkThe performance of very shallow geothermal systems (VSGs), interesting the first 2 m of depth from ground level, is strongly correlated to the kind of sediment locally available. These systems are attractive due to their low installation costs, less legal constraints, easy maintenance and possibility for technical improvements. The Improving Thermal Efficiency of horizontal ground heat exchangers Project (ITER) aims to understand how to enhance the heat transfer of the sediments surrounding the pipes and to depict the VSGs behavior in extreme thermal situations. In this regard, five helices were installed horizontally surrounded by five different backfilling materials under the same climatic conditions and tested under different operation modes. The field test monitoring concerned: (a) monthly measurement of thermal conductivity and moisture content on surface; (b) continuous recording of air and ground temperature (inside and outside each helix); (c) continuous climatological and ground volumetric water content (VWC) data acquisition. The interactions between soils, VSGs, environment and climate are presented here, focusing on the differences and similarities between the behavior of the helix and surrounding material, especially when the heat pump is running in heating mode for a very long time, forcing the ground temperature to drop below 0 °C
Intrusione Salina
No full textAGIP, 1994. Acque dolci sotterranee, Inventario dei dati raccolti dall’Agip durante la ricerca di idrocarburi in Italia dal 1971 al 1990. Roma, Italy, Agip S.p.A., 515 pp.
Beaty, R.D., Kerber J.D., 1993. Concepts, Instrumentation and Techniques in Atomic Absorption Spectrophotometry, Perkin-Elmer Corporation, Norwalk
Benvenuti, G., Norinelli, A., Zambrano, R., 1973. Contributo alla conoscenza del sottosuolo dell’area circumlagunare veneta mediante sondaggi elettrici verticali. Bollettino di Geofisica Teorica e Applicata XV (57), 23-38.
Benvenuti, G., Norinelli A., 1974. Studio geofisico di interfaccia acqua dolce- acqua marina nell’area circumlagunare veneta e nella zona delle sorgenti del Chidro (Taranto), Memorie degli Istituti di Geologia e Mineralogia dell’Università di Padova, 1974, vol. XXXI, 1-16
Bixio, A.C., Putti, M., Tosi, L., Carbognin, L., Gambolati, G., 1998. Finite Element Modeling of Salt water Intrusion in the Venice Aquifer System. In: Computational Methods in Surface and Ground Water Transport, 2, 193-200, Burganos V.N. et al. (Eds.), Suthampton, UK.
Bondesan, A., Meneghel, M., 2004. Geomorfologia della Provincia di Venezia: Note Illustrative della Carta Geomorfologica della Provincia di Venezia, Esedra Editrice
Brambati, A., Carbognin, L., Quaia, T., Teatini, P., Tosi, L., 2003. The Lagoon of Venice: geological setting, evolution and land subsidence. Episodes, 26(3), 264-268.
Carbognin, L., Tosi, L., 2003. Il Progetto ISES per l’analisi dei processi di intrusione salina e subsidenza nei territori meridionali delle Province di Padova e Venezia. Grafiche Erredici Padova (Italy), 95 pp.
Carbognin, L., P. Teatini & L. Tosi, 2004, Eustasy and land subsidence in the Venice Lagoon at the beginning of the new millennium. Journal of Marine Systems, 51, 345-353.
Carbognin L., Teatini P. & L. Tosi, 2005. Land Subsidence in the venetian area: known and recent aspects. Giornale di Geologia Applicata 1,2005, 5–11, doi: 10.1474/GGA.2005-01.0-01.0001.
Carbognin, L., Teatini, P., Tomasin, A., Tosi, L., 2009. Global change and relative sea level rise at Venice: what impact in term of flooding. Climate Dynamics, doi:10.1007/s00382-009-0617-5.
Clark I., Fritz P. 1997. Environmental Isotopes in Hydrogeology, Lewis Publisher, 1997
Cozzi R., Protti P., Raro T. 1987. Analisi chimica: Moderni metodi strumentali, ESU Spa
Craig H. 1961. Isotopic variations in meteoric waters, Science 133, 1702-1703
De Franco, R., Biella, G., Tosi, L., Teatini, P., Lozej, A., Chiozzotto, B., Giada, M., Rizzetto, F., Claude, C., Mayer, A., Bassan, V., Gasparetto-Stori, G., 2009. Monitoring the saltwater intrusion by time lapse electrical resistivity tomography: The Chioggia test site (Venice Lagoon, Italy). Journal of Applied Geophysics, 69, 117-130.
Di Sipio E., Galgaro A., Zuppi G.M. and Zangheri P., 2005. Detecting the origin of salt water contamination in groundwater in a lagoon area by the combined use of geophysical and geochemical tools: the example of the southern Venice Lagoon mainland. Groundwater and saline intrusion. Proceedings of the 18th Salt Water Intrusion Meeting. Instituto Geológico y Minero de España, Madrid, Spain, Hidrogeología y Aguas Subterráneas Series, 15, 373-384
Di Sipio, E., Galgaro, A., Zuppi, G. M., 2006. New geophysical knowledge of groundwater systems in Venice estuarine environment. Estuarine, Coastal and Shelf Science 66, 6-12.
Di Sipio, E., Galgaro, A., Zuppi, G. M., 2007. Contaminazione salina nei sistemi acquiferi dell’entroterra meridionale della Laguna di Venezia, Giornale di Geologia Applicata, 6, 01-08.
Di Sipio, E., Galgaro, A.,Rapaglia J., Zuppi G.M., 2008. Salt water contamination on Venice Lagoon mainland: new evaluation of origin, extension and dynamics. Proceedings 1st SWIM-SWICA Int. Joint Saltwater Intrusion Conference, , Cagliari-Chia Laguna, Italy, 3ESSE Commerciale, (CA), 195-204
Galgaro, A., Finzi, E., Tosi, L., 2000, An experiment on a sand-dune environment in Southern Venetian coast based on GPR, VES and documentary evidence. Annals of Geophysics, 43(2), 289-295.
Gattacceca, J. C., Vallet-Coulomb, C., Mayer, A., Claude, C., Radakovitch, O., Conchetto, E., Hamelin, B., 2009. Isotopic and geochemical characterization of salinization in the shallow aquifers of a reclaimed subsiding zone: The southern Venice Lagoon coastland. Journal of Hydrology 378 (1-2), 46-61.
Gonfiantini R., Stichler W., Rozanski K., 1995. Standards and intercomparison materials distributed by the International Atomic Energy Agency for stable isotope measurements. Reference and Intercomparison Material of Stable Isotopes of Light Elements. IAEA-TECDOC-825, Vienna, 13-29
Norinelli A., 1986. Elementi di geofisica applicata, Patron Editore, Bologna
Oude Essink G.H.P., 2001. Improving fresh groundwater supply problems and solutions, Ocean & Coastal Management, 44, 2001, 429-449
Rapaglia J., Di Sipio E., Bokuniewicz H., Zuppi G.M., Zaggia L., Galgaro A., Beck A., 2010. Groundwater connections under a barrier beach: a case study in the Venice Lagoon, Continental Shelf Research, 30 (2), 119-126
Reynolds J.M., 2001. An introduction to applied and environmental geophysics, John Wiley & Sons Editors
Rizzetto, F., Tosi, L., Carbognin, L., Bonardi, M., Teatini, P., 2003. Geomorphological setting and related hydrogeological implications of the coastal plain south of the Venice Lagoon (Italy). In: Servat, E., et al. (eds.), Hydrology of the Mediterranean and Semiarid Regions, IAHS Publ. n. 278, Wallingford, UK. pp. 463-470.
Teatini, P., Tosi, L., Strozzi, T., Carbognin, L., Wegmüller, U., Rizzetto, F., 2005. Mapping regional land displacements in the Venice coastland by an integrated monitoring system. Remote Sensing of Environment 98, 403-413.
Tosi, L., Teatini, P., Carbognin, L., Brancolini, G., 2009a. Using high resolution data to reveal depth-dependent mechanisms that drive land subsidence: The Venice coast, Italy, Tectonophysics, 474(1-2), 271-284.
Viezzoli, A., Tosi, L., Teatini, P., Silvestri, S., 2010. Surface water-groundwater exchange in transitional coastal environments by airborne electromagnetics: the Venice Lagoon example. Geophysical Research Letters, 37, L01402.
Vandenbohede A., Lebbe L., 2006. Occurrence of salt water above fresh water in dynamic equilibrium in a coastal groundwater flow system near De Panne, Belgium, Hydrogeology Journal, 14, 2006, 462-472.
Zezza F., Di Sipio E., 2008. Salt Water Intrusion in The Shallow Aquifers of Venice, Proceeding of the 20th Salt Water Intrusion Meeting SWIM, Naples, Florida, USA, June 23-27, 2008, 59-62
Zezza F., 2008: Geologia, proprietà e deformazione dei terreni del centro storico di Venezia. Secondo Convegno 'La riqualificazione delle città e dei territori', Geologia e Progettazione nel centro storico di Venezia' in Quaderni IUAV n. 54 pp. 9-41. Ed. Il Poligrafo, Padova
Zuppi G.M., Sacchi E. 2004. Dynamic processes in the Venice Region outlined by environmental isotopes. Isotopes in environmental and health studies, 40, 35-44Published531-5506A. Monitoraggio ambientale, sicurezza e territorioope
BENESSERE ORGANIZZATIVO E RISCHI PSICOSOCIALI: CARICO LAVORATIVO E RISORSE PERSONALI POSITIVE
Full text linkThis research - composed of two specific studies - is, as methodological contribution, in the framework of several surveys related to organizational well - being and psychosocial risks. In particular, it refers to work - related stress according to transactional psychological theories and Positive Psychology.
Purposes of the first study are the presentation of the factorial structure (CFA) of the scales related to workload, control and four personality variables: resilience, hope, optimism and self-efficacy.
Aim of the second study is to verify the presence of a higher - order factor composed of the four personal positive resources above - mentioned.
The model adjustments to the data, based on the fit indices χ2, CFI (Comparative Fit Index) and SRMR (Standardized RMR), are satisfactory. Then the factorial structure of the scales and the higher - order factor are confirmed.
Therefore these scales are appropriate to assess the influence of some individual characteristics - given the importance highlighted by the literature of personality variables - in the development of work - related stress.Il presente contributo di ricerca - che si compone di due specifici studi - si inserisce come contributo metodologico nell’ambito delle numerose indagini relative alle tematiche del benessere organizzativo e dei rischi psicosociali. Si riferisce, in particolare, allo stress lavoro - correlato nell’ambito dell’approccio psicologico di tipo transazionale e della Psicologia Positiva.
Gli obiettivi del primo studio consistono nella presentazione delle strutture fattoriali (CFA) delle scale relative al carico lavorativo, al controllo e a quattro variabili di personalità: la resilienza, la speranza, l’ottimismo e l’autoefficacia.
Gli obiettivi del secondo studio sono volti a verificare la presenza di un fattore di ordine superiore composto dalle quattro risorse personali positive sopra richiamate.
Gli adattamenti dei modelli ai dati, in base agli indici di fit χ2, CFI (Comparative Fit Index) e SRMR (Standardized RMR), risultano soddisfacenti. Vengono quindi confermate le strutture fattoriali delle scale e il fattore di ordine superiore.
Tali scale appaiono dunque idonee per valutare l’influenza di alcune caratteristiche individuali - data l’importanza messa in luce dalla letteratura delle variabili personalità - nello sviluppo dello stress lavoro-correlato
Rigorous determination of kinetic parameters from DTA measurements.
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Journal of Materials Science 19(2), 690-69
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