1,721,010 research outputs found
Using hydro-chemograph analyses to reveal runoff generation processes in a Mediterranean catchment
No full textThe paper deals with the hydro-chemical analysis performed in order to reveal processes, sources, paths and timing of the runoff
generation in an experimental catchment representative of the hilly, terrigenous and forested watershed in the Mediterranean
humid eco-region of southern Italy. The analysis is based on the data recorded at the outlet of the catchment during 2013–2014.
A mixing law procedure was applied on discharge (Q) and electrical conductivity (EC) data, by using the Q–EC end members
previously collected at selected groundwater, sub-surficial and surficial stations. In this way, we found four bound curves
delimiting fields in a Q–EC plot, each with hydro-chemograph value ranges. At annual time scale, the analysis revealed a
seasonal behaviour of the hydrological response, different for the wet period, when the aquifer is recharging, and the dry periods,
when the aquifer is discharging, despite frequent summer rain showers. At event time scale, the catchment seems to show the
behaviour of a typical hydro-geomorphic threshold system. We interpreted this behaviour as due to a progressive addition of
water from distinctive components (i.e. deep aquifer, riparian corridor, hillslope and hollow), each with originally different
mechanisms of runoff production (i.e. groundwater, groundwater ridging, saturation excess, infiltration excess and soil pipe
exfiltration) and response time. During the event, the contributing areas enlarge upward the riparian corridors and the zero-order
basins, where the aforementioned components become superposed and the mechanisms interact more and more. We hypothesize
that the threshold values between different states of the system are defined by the intersections of the boundary curves on the Q–
EC plot. Different patterns in the Q–EC hysteretic cycles are prevalently related to the pre-event soil saturation and groundwater
contributions to stormflow and recharge mechanisms. Copyright © 2016 John Wiley & Sons, Ltd
DEFINIZIONE GIS_BASED DELLE BARRIERE OROGRAFICHE DELL’APPENNINO CAMPANO-LUCANO (ITALIA MERIDIONALE)
No full textDigital orographic map of peninsular and insular Italy
No full textThis paper describes method and contents of the digital orographic map of peninsular and insular Italy, comprising the islands of Elba, Sicily and Sardinia at 1:1,250,000 scale. The map was obtained using a modification of a previous proposal to define mountain orders, starting from the SRTM-NASA digital elevation model (90×90 m cell). The method, comparable to the well known drainage network ordering system, uses the topographic concepts of key contour, key saddle, summit point, prominence, and others. It was implemented in a step-by-step GIS-based procedure in order to automatically identify, delimit and order mountains and hills. The procedure permits the derivation of the parent relationship between orographic entities and organizes the ordered mountains in an orographic hierarchy. The orographic mapping system is able to produce an orographic dataset from DEM's, organize orographic geodatabases and manage mapping tools in many research fields. The map here presented is particularly useful to support interdisciplinary studies in tectonic geomorphology, topo-climatology, regional hydrology and landscape ecology at national scale
Discharge-electrical conductivity relationship in the Ciciriello Torrent, a reference catchment of the Cilento, Vallo Diano and Alburni European Geopark (Southern Italy)
No full textA simplified approach to assess indoor Radon activity concentrations based upon on-site experimental evaluations of Radon exhalation from building materials
No full textCharacterization of karst springs in a typical Mediterranean fluvial landscape through an interdisciplinary investigation based on Radon-222 as an environmental indicator
No full textLow flow regime description and its dependence on monitoring timing for the Ciciriello experimental catchment
No full textThe validation of a semplified model to predict Indoor Radon activity concentrations: The S.I.R.E.M. model
No full textHydro-geo-chemical streamflow analysis as a support for digital hydrograph filtering in a small, rainfall dominated, sandstone watershed
Full text linkThe aim of the present study is an analysis of the ability of digital hydrograph filtering tools for the characterization of the baseflow source contributing to total streamflow for a typical, small, sandstone, rainfall dominated catchment. Daily streamflow and electrical conductivity data for an experimental catchment, the Ciciriello catchment, a 3km(2) watershed located in Southern Italy, have been collected to the purpose since 2012. The application of a mass balance filter (MBF), using electrical conductivity as tracer data, has pointed out a seasonal characterization of the baseflow pattern, contributing to total streamflow by 90% during the low flow period and up to 40% during the high flow period. The Lyne and Hollick one parameter and the two parameters Eckhardt digital filters have been furthermore processed, both in an uncalibrated and calibrated application. Providing a preliminary total streamflow and baseflow recession analysis, the one parameter filter appears particularly suited for ungauged cases, as the uncalibrated and calibrated applications are almost identical, with relative prediction errors, compared to MBF, smaller than 5%. The uncalibrated two parameters filter generates instead large relative error of about 35%. To improve the baseflow description, in particular during the low flow period, and to correct large (28%) underestimation of the minimum baseflow value, a seasonal calibration for the BFImax parameter (the maximum BaseFlow Index that can be modeled by the filter algorithm) is in fact needed. (C) 2016 Elsevier B.V. All rights reserved
- …
