305,300 research outputs found
Riforma e problematiche della portualita'
No full textL’analisi effettuata nel capitolo, la cui redazione è stata coordinata da F. Munari, muove dagli scenari globali, europei e nazionali sui mercati e i flussi di traffico caratterizzanti il trasporto marittimo e porti (par. 1, redatto da L. Antonellini e P. Costa). Tali scenari vengono confrontati sia coi documenti programmatici del Governo (il Piano Strategico Nazionale sui Porti e la Logistica, l’Allegato Infrastrutture 2017 al DEF), sia con le norme adottate a livello nazionale (d.lgs. n. 169/2016 di riforma della l. n. 84/1994) ed europeo (Regolamento 352/2017), evidenziandone gli elementi positivi e le criticità (par. 2 di L. Antonellini e F. Munari; par. 4 di F. Munari; par. 5 di P. Costa). Sulla riforma portuale, pur dando atto delle buone intenzioni del legislatore, il rapporto evidenzia ritardi e imperfezioni attuative, che potrebbero pregiudicarne le potenzialità e dovrebbero quindi essere rimediate quanto prima (par. 2 di L. Antonellini e F. Munari e par. 4 di F. Munari). Particolare attenzione viene quindi rivolta alla pianificazione e alle modalità di scelta di finanziamento delle dotazioni infrastrutturali (par. 3 e 5 redatti rispettivamente da P. Spirito e P. Costa): con taluni distinguo anche rispetto agli interventi da compiere, si sottolinea l’assoluta necessità di criteri e metodologie obiettive e credibili nella selezione degli interventi infrastrutturali, tanto più considerati (a) i vincoli di finanza pubblica e l’esigenza di non disperdere risorse e tempi con (annunci di) interventi «a pioggia» e non ancorati ad alcun disegno strategico né sistemico e (b) la circostanza che le non-scelte risultano ulteriormente penalizzanti nel contesto globale dove altri si muovono invece rapidamente. Presupposti comunque necessari per una politica degli investimenti in infrastrutture portuali e logistiche appaiono, da un lato, una valutazione ex ante delle loro ricadute al servizio di una policy non limitata ai porti, bensì funzionale all’intera catena logistica, agli stessi centri produttivi del Paese, e ai flussi prospettici dei grandi traffici globali; dall’altro lato, una visione strategica degli investimenti da compiersi, in due direzioni: (a) svincolarsi da logiche prevalentemente conservative e al massimo migliorative di infrastrutture esistenti (molte delle quali comunque inadeguate a sostenere nel lungo periodo una presenza importante del nostro Paese nella catena produttiva e logistica globale); (b) puntare su obiettivi di eccellenza e di ampio respiro, capaci di segnare una discontinuità rispetto alle inadeguatezze del nostro sistema infrastrutturale, a costo di operare scelte selettive marcate. Ciò non significa puntare esclusivamente a intercettare progetti globali, come lo One Belt One Road, ma sviluppare anche la posizione mediterranea del nostro Paese e la vocazione dell’Italia a porsi come punto di riferimento per il Nord Africa e il Medio Oriente
MEASURING SALINITY WITHIN SHALLOW PIEZOMETERS: COMPARISON OF TWO FIELD METHODS
No full textThe objective of this study is to understand the validity of salinity vertical profiles collected from shallow piezometers that are not previously flushed. This study shows that salinity data collected from boreholes are only an average value along the entire screened section of the piezometer. In order to collect data that is representative for the salinity of the adjacent aquifer, a new monitoring strategy has been developed. This strategy includes measurement of the salinity at the top of the water table in an auger hole which is a shallow boreholes made with an handheld drill. This should be combined with measurements in piezometers that are first flushed to take out stagnant water. From the piezometers on can measure the average salinity of the screened part and the salinity at the bottom of the aquifer. . By using this monitoring strategy it is also possible to define where the piezometers screens are located if this is not known beforehand
Barometric pressure influence on water table fluctuations in coastal aquifersof partially enclosed seas: An example from the Adriatic coast, Italy
No full textItaly) were recorded to characterize groundwater level response to sea level fluctuations. Tide-inducedfluctuations, atmospheric pressure loading and recharge from rainfall have all been recognized in themeasured water table changes. We also identified additional water table fluctuations that are not relatedto rain, atmospheric pressure or tides. We propose that these additional fluctuations are related to interactionof groundwater, seiche events and ‘inverted barometric effects’. Their amplitude is important, because at a distance of 70 m from the coast they have a magnitude of 0.07 m, whereas the local tide has a 1 m amplitude. Seiches are standing waves that create sea water fluxes which affect groundwater below the first row of dunes in the study area. We propose that this ‘inverted barometric effect’ is an important process in creating water fluxes in the coastal zone that may strongly affect the position and width of the mixing zone between salt and fresh water
Hydrogeological characterization of small coastal wetlands and forests in the Southern Po Plain (Northern Italy).
No full textThis study is aimed to characterize the shallow groundwater system in the coastal area between the Uniti and Bevano rivers (southern part of the Po plain), where salinization is threatening the coastal ecosystems and posing a major environmental issue for the phreatic water management in the coast. A thin rainwater lens is present at the top of the aquifer in the backshore area and its extent has a seasonal variability. These few centimetres of freshwater represent a thin interface between sea water and the delicate coastal ecosystems, such as those of dunes and wetlands. To have a better understanding of the changes in groundwater chemistry, we performed a seasonal monitoring of the water quality at the top of the aquifer. Effective concentrations of chemicals and actual values of physical-chemical parameters in the rainwater lens could be measured by means of auger holes. The analysis of the cation-exchange process in the aquifer was made through the application of the Base Exchange index (BEX index) of Stuyfzand (2008), an indicator of salinization or freshening of waters. The results pointed out that a salinization process is taking place in the largest part of the aquifer. Extension and chemical composition of the rainwater lens are strongly influenced by anthropogenic factors such as drainage and land use. The surface water bodies are all brackish to salty and characterized by anoxic and reducing conditions. At present, only halophytes are present around the dune slacks, which have turned into brackish to hypersaline lakes
From fractures to flow, a field-based quantitative analysis of an outcropping carbonate reservoir
No full textGoing Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
ENUCLEAZIONE E CRESCITA DI FAGLIE TRASCORRENTI IN DEPOSITI CARBONATICI DI BACINO AFFIORANTI AL FRONTE DI UN SOVRASCORRIMENTO (MONTAGNA DELLA MAJELLA, ITALIA CENTRALE)
No full textIL RUOLO DELLE BANDE DI DEFORMAZIONE E DELLE STILOLITI NELLO SVILUPPO DELLE FAGLIE IN GRAINSTONES CARBONATICI, MONTAGNA DELLA MAJELLA, ITALIA CENTRALE
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