1,721,688 research outputs found
Inquadramento geologico del dominio vulcanico laziale
No full textIl vulcanismo del Lazio, sviluppatosi a partire dalla fine del Pliocene, è parte della “Provincia vulcanica tosco-laziale”, impostatasi in una fascia strutturalmente depressa parallela alla costa tirrenica; l’area è compresa tra il settore più elevato della catena appenninica e le zone costiere, al margine del bacino tirrenico, caratterizzato da una crosta di tipo oceanico di età pliocenica. Le rocce vulcaniche della “Provincia tosco-laziale”, possono essere raggruppate in diverse serie comprendenti rocce da acide a intermedie e rocce potassiche.The volcanic activity of Latium, which started during the late Pliocene, is part of Tuscany and Lazio Volcanic Province which has been grown in a structurally subsided band parallel to the Tyrrhenian coast; the area is located between the Apennine leliefs and the coastal areas, at the margin of the Tyrrhenian basin, characterized by an oceanic crust (Pliocene). The volcanic rocks of Tuscany and Latium province, can be grouped into several series. In the Latium region, the volcanic activity originated several volcanic districts with predominantly subaerial explosive activity, alternating with central and areal structures: the Vulsini Volcanic District , the Cimino-Vicano distict, the Sabatino Discrict, the Tolfetano-Cerite-Manziate District, and finally the The Colli Albani Volcano. Several authors, deduced information about these volcanic districts and the prevolcanic bedrock by means of the analysis of the outcrops in the past. Only in recent decades, thanks to geophysical methods, remote sensing and many deep borehole data, it was possible to obtain a clearer picture of deep geological setting of this sector
Individuazione dei bacini idrogeologici. Analisi della circolazione idrica sotterranea
No full textL’identificazione dei modelli fisici di riferimento, dell’entità delle risorse realmente presenti negli acquiferi, degli scambi tra falda e reticolo idrografico, delle aste fluviali perenni, secondo una lettura distribuita all’interno dei bacini e delle unità idrogeologiche, è fondamentale per il calcolo dei bilanci, per la definizione dello stato di criticità e per la gestione delle risorse idriche. Gli schemi ed i bacini idrogeologici utilizzati per la definizione dei bilanci e delle criticità sono stati definiti mediante analisi dell’assetto geologico-strutturale e piezometrico del territorio studiato.The identification of physical models, the effective evaluation of the groundwater resources, the relationships between groundwater and the surficial drainage network, are essential for the budget evaluation and to identify critical conditions for groundwater resources management. Groundwater conceptual models and hydrogeological basins used for the budget and critical conditions identification have been defined by the analysis of the structural –geological setting and the potentiometric pattern of the study area
A cross-sectional coprological survey of liver flukes in cattle and sheep from an area of the southern Italian Apennines
No full textFrequency, body distribution and population size of Malassezia yeasts in healthy dogs and dogs with pruritic skin lesions
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Cenni di idrogeologia dell’area romana
No full textL'assetto idrogeologico del territorio del Comune di Roma è condizionato dalla presenza di distinti ambiti geologici, che determinano l'esistenza di più unità idrogeologiche: Unità dei Monti Sabatini; Unità dei Colli albani; Unità di Ponte Galeria; Unità delle piane alluvionali; unità del delta del Fiume Tevere. I molteplici acquiferi presenti in queste idrostrutture hanno una circolazione complessa che tende a raccordarsi a ridosso delle quote corrispondenti ai livelli di base fondamentali costituiti dai Fiumi Tevere, Aniene, Astura e dal mare. Le unità idrogeologiche del territorio romano sono limitate inferiormente dalle argille vaticane che fungono da aquiclude e vengono ricaricate anche da aree esterne all'ambito comunale.The hydrogeological setting of Rome is conditioned by the presence of several geological areas, which determine the existence of several hydrogeological units: Units of Monti Sabatini, Unit of the Alban Hills, Unit of Ponte Galeria, Unit of flat alluvial units the delta of the River Tiber. The aquifers in these hydrogeological units present a complex circulation that regionally can be read as drained by the Rivers Tiber, Aniene, Astura and the sea. The hydrogeological units of the Roman area is sustained by the “Vatican Clays” which act as an aquiclude , and they are also recharged in locations out of the roman urban area
Hydrogeology of the Colli Albano volcano
No full textThis study, based on numerous investigations previously conducted by the Authors, was carried out for different purposes, in the field of water resource management.
The hydrogeological setting of the Colli Albani Volcano was defined by using a large stratigraphic data base, whose data were processed with GIS and numerical aquifer modelling methodologies. The process made it possible to reconstruct the fundamental geological surfaces and, from them, the local hydrogeological complexes. The complexes were then associated with permeability values obtained from in-hole hydraulic tests. After numerous surveys, detailed piezometric maps were built. The maps describe the morphology of the top of the saturated zone referred to the basal groundwater system. Based on the geometry obtained, the “Colli Albani” Hydrogeological Unit has been subdivided in hydrogeological basins.
In the Colli Albani area, streams (especially in their terminal section) are in close relationships with groundwater. Under natural conditions, these relationships control the flow of groundwater towards the catchment area. At present, however, lowering of saturation levels is causing a sharp decrease in stream-bed discharge and often a reversal of the directions of groundwater flow. Water budgets were computed for the overall hydrogeological system and for each hydrogeological basin. The computations considered not only the natural parameters of outflows and inflows to/from the hydrogeological system, but also those of human activities having a major impact on aquifer recharge. So far, water withdrawal from the two basins has exceeded the availability of and strongly depleted the local renewable water resources.
The paper also presents maps describing the physico-chemical characteristics of groundwater in the study area and the isopleths of their electrical conductivity and temperature values
A prevalence survey and risk analysis of filariasis in dogs from the Mt. Vesuvius area of Southern Italy.
Full text linkA dog microfilariae prevalence and risk factor survey was conducted in 51 contiguous municipalities of the Mt. Vesuvius area (Campania region, southern Italy) in order to add data to the limited epidemiological information available regarding filarial worms in this zone. Between May 1999 and June 2000, blood samples were collected from 351 asymptomatic dogs. Blood samples were examined using a modified Knott's technique and histochemical staining in order to count and identify microfilariae. The results were subjected to statistical analysis and choroplethic municipal maps (MMs) were drawn by a geographical information system (GIS) software. Microfilariae were detected in 63 of the 351 dogs surveyed, constituting a total filarial prevalence of 17.9%. In particular, 56 dogs (15.9%) showed only microfilariae of Dipetalonema reconditum; three dogs (0.8%) only microfilariae of Dirofilaria repens; two dogs (0.6%) microfilariae of both D. reconditum and D. repens and two dogs (0.6%) microfilariae of both Dirofilaria immitis and D. repens. High D. reconditum prevalence was associated with hunting practice, masculine gender and older dogs. There was also a tendency to find high prevalence in dogs sampled in the afternoon. In conclusion, the presence of microfilariae of D. reconditum in 92% of microfilaraemic dogs indicates that this filarial worm was the predominant filarial species in dogs in the Mt. Vesuvius area. In addition, the general trends of the MMs showed that D. immitis and D. repens were present only in a few municipalities, whereas D. reconditum was widely and homogeneously spread throughout the entire study area
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