4,563 research outputs found
Weight of Evidence and Artificial Neural Networks for potential groundwater springs mapping: an application in Mt. Modino area (Northern Apennines, Italy)
No full textLocations of potential groundwater springs were mapped in an area of 68 km2 in the Northern Apennines of Italy based on Weight of Evidence (WofE) and Radial Basis Function Link Net (RBFLN). A map of more than 200 springs and maps of five causal factors were uploaded to ArcGIS with Spatial Data Modelling extensions. The WofE and RBFLN potential groundwater spring maps had similar prediction rates, allowing about 50% of the training and validation springs to be predicted in about 15 to 20% of the study area. The two maps were merged using a heuristic combination matrix in order to produce two hybrid maps: one representing susceptible areas in both the WofE and RBFLN maps (type A), while the other representing susceptible areas at least in one of the two maps (type B). For small cumulated areas, the success rate of both hybrid maps was higher than that of the parent maps, while for large cumulated areas, only the type B hybrid map performed similarly to the parent maps. This conclusion suggests different applications of these maps to water management purposes
Hydro-chemical anomalies in clay-rich landslides: evidences from case studies in the northern Apennines (Italy)
No full textThe presence of deep faults can affect the groundwater circulation. They can control the rising of deep fluids to
the ground surface. Normally, deep fluids have a chemical composition completely different from the shallow
groundwater; depending on the travel depth, temperature and pressure conditions, mineral composition of the
rocks crossed and time of interaction.
This can affect the hydro-chemical characteristics of near-surface groundwater. Eventually, it can change the
fingerprint of groundwater circulating in landslides and it can influence long-term pore-pressure fluctuations,
playing a role on slope stability.
In the northern Apennines of Italy, several large-scale earth slides – earth flows affecting faulted clayey formations
are believed to be somehow influenced by deep fluids. The study was aimed at detecting hydro-chemical anomalies
in groundwater circulating in 3 landslides that have resumed activity several times in the last decades, and that
are occurring in areas of potential deep-fluid influence (Silla, Ca’ Lita, Vedriano). More than 30 water-samples
were collected at different depth in the landslide body and in the underlying bedrock, owing to the presence
of several piezometers. Physical and chemical analyses comprised determination of temperature, conductibility,
pH, main cations and anions (K+, Na+, Cl, Ca2+, Mg2+, SO42 and HCO). Isotopic analyses (oxygen and
deuterium) are still ongoing. Results allowed discriminating between a Ca-Carbonate hydrotype (400-600 μS/cm),
that is interpreted as being directly connected with rainfall infiltration, and a Na-sulfate-rich hydrotype, that is
interpreted as the evidence of deep fluids upflow. This would actually be the result of the mixing between two
extreme hydrotypes: Na-bicarbonate water and Ca-sulfate waters, both characterized by high salinity, over 4000
μS/cm. The first is typical of geothermal water in the Apennines and is linked to the infiltration at great depth of
rain water and the subsequent long term interaction between water and rock masses that allows to degradation of
the Na-silicate. The second hydrotype, Ca-sulfate water, might be related to the presence of gypsum deposits in
the stratigraphic sequence of the Apennines chain
Milano consolato nell' elettione a questo arciuescouado, e promotione alla sagra porpora dell' eminentissimo Federico Visconti : colla sua solennissima entrata seguita a' 11. genaro 1682 e fontioni antecedenti /
No full textFrontispiece coat of arms of Milan, engraved by Federico Agnelli.Signatures: pi⁴ A-G⁴ H⁴(-H4).Mode of access: Internet.Binding: limp vellum. Author & title written on spine
Modellazione numerica dei meccanismi di riattivazione di grandi frane per scivolamento di terra: l’esempio della frana di Tolara, Appennino settentrionale
No full textThe time and space evolution of large earth slides in weak and complex rockmasses, that characterize thenorthern Apennines, is depending on geological setting and past climate. At the present the reactivation of theselandslides are due to mainly to hydrogeological and geotechnical features. This paper describes the hydrogeological andgeotechnical features of these landslides and the reactivations mechanism using coupled 2D hydrogeological numericalmodel and limit equilibrium analysis (Geoslope, 2004). The case study is the Tolara landslide (Modena Apennines) thatresumed activity in 2002. In this landslide some hydrogeological and geotechnical data have been collected from 2003 todate
Hydro-mechanical features of landslide reactivation in weak clayey rocks
No full textIn the northern Apennines, four representativelarge and deep seated landslides affecting weak rockmasses have been studied before, during and after reactivationevents. Semi-continuous and continuous monitoringin the 2004–2006 period included the dormancy, reactivationand suspension phases, allowing some comments tobe put forward as regards the hydro-mechanical conditionsthat drive the reactivations. The data have highlighted theinteractions between groundwater and displacement ratesin different sections of the slope
Hydrogeological investigation of Pietra di Bismantova slab and surrounding slope deposits (northern Apennines, Italy)
No full textThe recent application of hydrochemistry to unstable slopes reveals the contribution of this technique to better understand hydrological processes, water rock interaction and to outline groundwater flow paths. The aim of this short note is to present results from two years of semi-continuous monitoring (discharge, EC, temperature) of two springs (Eremo and F. Cornia spring) flowing along the SE slope of Bismantova fractured slab, in the stable and unstable portion of the slope respectively. Both springs follow the precipitation pattern with the increase of discharge and decrease of temperature as consequence of rainfall recharge; moreover the increase of EC seems to suggest interaction beetween groundwater and mineral phases hosted along fractures of the slab. Using chemical results a first inverse modeling with PHREEQC have been performed in order to identify the interaction between water infiltrating in host-rock and mineral phases, as well to reconstruct geochemical evolution of groundwater from the upward stable portion to the downward unstable portion of the slope
Analisi della predisposizione al manifestarsi di sorgenti in area appenninica: un approccio statistico applicato all’area del Monte Modino (Provincia di Modena)
No full textIl lavoro,centrato sull’applicazione di codici di calcolo statisticiin ambiente Arc-GIS già utilizzati nel campo dellaricerca geomineraria, intergrati con l’analisi dei complessiidrogeologici, permette l’individuazione delle zonepotenzialmente idonee al reperimento ed eventuale captazionedella risorsa. Il tipo di informazione ottenuta,integrata ad una carta dei complessi idrogeologici, èutile per la pianificazione dello sfruttamento e per latutela della risorsa idrica
»It contained harbours that pleased me like sonnets«. Kleine Poetik der diegetischen Karte
No full textIn this article, Federico Italiano explores the relationship between literature and cartography. Beginning with Stevenson’s Treasure Island, the author frames the topic through a general theoretical lens on the spatial dimension of literary texts. He then focuses on a specific phenomenon of literary "carticity"—the diegetic presence of the map, that is, the map as an integral element of the narrative structure. Among others, Italiano examines the works of Houellebecq and Cormac McCarthy
Un modello a rete per la ricerca e l’innovazione in Italia
No full textUna proposta per creare un sistema organizzativo policentrico in grado di aiutare le medie e piccole imprese a fare il grande balzo nell’innovazione e nella trasformazione digitale
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