1,721,017 research outputs found
Groundwater resources allocation key factors mapping in mountainous catchments through the integrated use of GIS analysis and water flows monitoring
No full textMonitoring and modeling dual-density flow for the prediction of salinization effects in a shallow coastal aquifer due to sands quarry excavation (Ferrara, Italy)
No full textModellazione numerica di flusso per la progettazione di un sistema di emungimento con pozzi a raggiera
No full textIn the city of Ferrara (Italy) water for human supply is mainly exploited from the Po River and only 1/7 of the total comes from groundwater of the first confined aquifer of the multilayered flow system of the Po plain. Problems related to low hydraulic levels in the river during dry season and to the high vulnerability of shallow waters to contaminant events, addressed the public authorities to evaluate and plan new exploiting strategies.
The best solution is represented by two radial wells extending below the river, that allows to solve dryness problems and to lower the depuration costs taking advantage of the natural riverbank filtration. This strategy is here evaluated in relation to hydrogeological issues: a groundwater flow model has been developed with Feflow 5.3 in order to size the pumping rates and to predict the piezometric drawdown.
Model has been set up collecting and organizing all the available data in the study area and particulary the detailed geological and hydrogeological data near the river in the supply area. Calibration has been performed both at steady state (with two different data-sets corresponding to 2003 and 2010) and at transient state (on 2 aquifer tests
Characterization and modeling of a BTEX plume originated by a sulphur rich NAPL source
No full textThe biodegradation of the aromatic
hydrocarbons benzene, toluene, ethylbenzene,
and xylene isomers (BTEX) has been the topic
of numerous laboratory studies (Mazzeo et al.
2010; Xie et al. 2010) and field studies (Chapelle
et al. 2002; Cozzarelli et a. 2010). Microbial
consortia present in the aquifer have the
potential to degrade a wide range of organic
pollutants in addition to BTEX (Weelink et al.
2010). In situ studies and laboratory experiments
have shown that biodegradation can abate
contaminants concentration below or near to
regulatory threshold levels (Anderson and
Lovley, 2000; Cozzarelli et al. 2001). However,
within the contaminated aquifers, often
biodegradation reactions are limited by the
availability of electron acceptors (Christensen et
al. 2000)
Groundwater flow systems in torbiditic units
No full textThe paper deals with the analysis of hydrological and hydrochemical data coming out from 2 distinct monitoring projects of springs and creeks in 5 mountainous watersheds in Northern Apennines (Italy), located inside the outcropping area of “Marnoso Arenacea” arenaceous torbiditic unit. The main goal is to define a conceptual model for groundwater flow in such a litology, widespread in the area. Base-flow discharge is mainly focused on creeks, where they intersect tectonic lineaments or as a consequence of a well developed interflow in the most detensioned and weathered shallow portion of the rock mass; springs occurrence is controlled by Arenite/Pelite ratio and is connected to local groundwater flow systems (sensu “Tóth”). Instead, the few higher yield springs are connected to watershed-boundary crossing tectonically-controlled groundwater flow systems
Does groundwater protection in Europe require new EU-wide environmental quality standards?
No full textThe European Groundwater Directive could be improved by limiting the scopes of the Annexes I and II to the manmade and natural substances, respectively, and by defining a common monitoring protocol. The changes in the European land use patterns, in particular the urban sprawl phenomena, obscure the distinction between the point and diffuse sources of contamination. In the future more importance will be given to the house hold contamination. Moreover, the agricultural environment could be used for developing new conceptual models related to the pharmaceuticals
Aquifer-type behaviour of Marnoso-Arenacea formation in Northern Apennines: evidences from hydrogeological monitoring and hydrochemical data
No full textInterazione tra gli acquiferi A1 e A2 nella zona di Settepolesini (Bondeno) tramite simulazione numerica di flusso e trasporto
No full textIl lavoro qui presentato ha come obiettivo lo studio idrogeologico del I acquifero confinato A1 in un'area comprendente alcune porzioni delle province di Ferrara e Mantova. Dai dati e dalle misure raccolte si è cercato di ricavare e proporre un modello idrogeologico concettuale del sottosuolo che è poi sfociato in un modello numerico del flusso idrico sotterraneo (MODFLOW 2000). Inizialmente il grado di calibrazione di tale simulazione risultava scarso per cui sono state avanzate diverse ipotesi per cercare di migliorare il modello concettuale di riferimento. Una di queste ipotesi consisteva nel supporre la presenza di uno spartiacque piezometrico subaparallelo al fiume Po dovuto alla coalescenza tra gli acquiferi A1 ed A2. Per testare tale ipotesi è stato quindi definito un piano di campionamento e di analisi che ha previsto il prelievo di campioni d'acqua presenti in 6 piezometri ubicati nell'area di indagine. Sulla base dei dati idrogeochimici ottenuti è stato realizzato un modello numerico di trasporto non reattivo in regime stazionario, tramite il software MT3D-MS, che ha permesso di confermare la risalita di acque salate verso l'acquifero A1
Data collection and groundwater flow modeling for groundwater supply plants management: three case studies from Ferrara (Italy)
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