1,720,994 research outputs found
La procedura dell'analisi di rischio sanitario ambientale applicata ai mezzi fdratturati e carsificati
No full textLa ricarica naturale della falda idrica dell'acquifero costiero di Metaponto
No full textSi tratta di un acquifero poroso disposto lungo la costa ionica. E' costituito da depositi detritici ciottolosi, sabbiosi ed argillosi. La falda idrica è condizionata dalle incisioni fluviali, dai deflussi e dall'agricoltura. Sulla base di serie cronologiche di dati idrologici e idrogeologici si è applicato un modello matematico per simulare la ricarica naturale dell'acquifero, utilizzando la soluzione analitica di Hantush (1967). Uno studio di sensitività ha mostrato l'influenza di qualche parametro idrogeologico sull'innalzamento dei livelli piezometrici di faldaPublished399-4066A. Monitoraggio ambientale, sicurezza e territorioN/A or not JCRope
Metodologie di valutazione del sovraccarico neve per la progettazione dei fabbricati rurali
No full textSTOCASTIC FRACTURE FLOW MODELLING AND INFLUENCE OF THE COMPUTATIONAL PROCEDURES ON THE POLLUANTS MIGRATION IN A CASE STUDY
No full textAPPROCCI MODELLISTICI E METODI DI TRATTAMENTO DATI CON INTEGRAZIONE DI ANALISI PRELIMINARI PER LA VALUTAZIONE DEL RISCHIO IN SITI CONTAMINATI
No full textMetodologie di valutazione del sovraccarico neve per la progettazione dei fabbricati rurali
No full textRISK ASSESSMENT IN METROPOLITAN AREA OF INDUSTRIAL TOWNS POLLUTED BY PETROL HYDROCARBONS
No full textModeling Stygofauna Resilience to the Impact of the Climate Change in the Karstic Groundwaters of South Italy
No full textWe predicted the global warming effects on the stygofauna of Murgia–Salento karstic groundwaters in Italy for 2050, which contribute to a biodiversity loss assessment in the climate change context. For quantitative impact estimations, we defined a local resilience score (LRS) for sampled species between 2018 and 2021. A resilience model equation of the stygobiont species conservation was obtained from a surface best-fit of the assigned LRS and the corresponding values of independent variables describing the environmental quality of monitored habitats and LRS. The principal components of the correlation between the monitored variables and LRS were obtained via factor analysis. Three-dimensional surface maps of stygofauna species resilience (SSR) were constructed to visualize and quantitatively compare the biodiversity loss of species assemblages owing to environmental and habitat quality modifications. The proposed SSR model was applied to the sampled stygofauna, and the decrease in local species resilience for 2050 was predicted. Independent variable factors were updated for 2050 to consider increases of up to 2 °C and 0.04 mS/cm in groundwater temperature and electric conductance observed for 2021. The SSR model results predicted a high impact on the resilience of Parastenocaris cf. orcina (80%), newly retrieved Crustacea Copepod Cyclopidae gen 1 sp 1, and three other stygobites (~50%). The resilience of Metacyclops stammeri had minor impacts
Assessment of the impact of sea-level rise due to climate change on coastal groundwater discharge
No full textAn assessment of sea intrusion into coastal aquifers as a consequence of local sea-level rise (LSLR) due to climate change was carried out at Murgia and Salento in southern Italy. The interpolation of sea-level measurements at three tide-gauge stations was performed during the period of 2000 to 2014. The best fit of measurements shows an increasing rate of LSLR ranging from 4.4 mm/y to 8.8 mm/y, which will result in a maximum LSLR of approximately 2 m during the 22nd century. The local rate of sea-level rise matches recent 21st and 22nd century projections of mean global sea-level rise determined by other researchers, which include increased melting rates of the Greenland and Antarctic ice sheets, the effect of ocean thermal expansion, the melting of glaciers and ice caps, and changes in the quantity of stored land water. Subsequently, Ghyben-Herzberg's equation for the freshwater/saltwater interface was rewritten in order to determine the decrease in groundwater discharge due to the maximum LSLR. Groundwater flow simulations and ArcGIS elaborations of digital elevation models of the coast provided input data for the Ghyben-Herzberg calculation under the assumption of head-controlled systems. The progression of seawater intrusion due to LSLR suggests an impressive depletion of available groundwater discharge during the 22nd century, perhaps as much as 16.1% of current groundwater pumping for potable water in Salento
Hydrogeological model to study natural water flow in karstified and fractured aquifers
No full textMany studies deal with the evolution of karst processes in fractures and conduits within the epikarst, the vadose zone and the phreatic zone of karstified limestone rock masses. Details about the geo-structural setting and the underground conduit pathways and connections can be obtained from the integration of geological/ speleological surveys and tracer tests. These methods are aimed to collect geomorphological, geo-structural, stratigraphic and petrological data at the surface and inside the cave systems, to combine with information derived from tracer tests (i.e. δO18 - δ13C stable isotopes). Whatever the approach, the choice of the best hydrogeological model, i.e. the best way to simulate the water flow through a karstified aquifer, is a very complex problem due to the difficulties to gather detailed geological and hydrological data. The lack of information often leads to several uncertainties on the assumptions of the starting model, namely as regards the underground water movements, the delimitation of the hydrogeological catchment, and the thickness of the saturated zone. The final goal of this research is to build the most suitable conceptual hydrological model, which may allow implementing a realistic simulation of the karstified and fractured groundwater flow. This aim will be obtained by a detailed investigation of the cave systems and the surrounding superficial areas, merging classical geological surveys and speleological investigations. So far, we are able to present the exploration results of the Apulian cave “Inghiottitoio di Masseria Rotolo”, located in the Canale di Pirro polje (Low Murge - Monopoli, Italy). It has been discovered in 2012 and totally develops inside Cretaceous limestones belonging to Apulian Carbonate Platform. The cave reaches water table at the depth of - 264 meters below the ground; diving explorations, carried out during 2018, have brought the total depth of the karst system at - 324 m, making it the deepest cave in Apulia. Inghiottitoio di Masseria Rotolo is a remarkable cave system, characterized by very large passages, including very impressive vertical shafts, with presence also of extremely rich in speleothems rooms. This extraordinary situation represents a real natural, hydrogeological, field-scale laboratory, to direct study both the groundwater and karst conduits outflows, giving the opportunity to collect precious data to better support the hydrogeological conceptual and mathematical model of the Cretaceous limestone rock mass
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