Search results for "Forestal"
showing 10 items of 1240 documents
Impiego dei funghi micorrizici arbuscolari come indicatori della qualità dei suoli
2010
Verifica del concetto di modello fisico in due stazioni di misura dell’erosione parcellare
2012
Calibrazione del modello SEDD con l'impiego di un rilievo laser scanner terrestre
2009
Field investigation on rilling in the experimental Sparacia area
2008
In this paper the results of a field investigation on rilling carried out in the experimental Sparacia area are reported. The measurements were made on a plot 6 m wide and 22 m long subjected to natural rainfalls. For ten rainfalls the total soil loss (interrill and rill erosion) was collected in a storage system consisting of two tanks arranged in series at the base of the plot. Rill morphology (rill length and cross-sections) was measured for five rainfall events, while the rill profile was surveyed for three events. First the contribution of each component (rill and interrill erosion) to total soil loss was established. Then the analysis allowed establishment of a power relationship betw…
Comparative analysis of surface energy balance models for actual evapotranspiration estimation through remotely sensed images
2012
CARATTERIZZAZIONE MULTISCALA DEL SISTEMA SPA PER LA MODELLAZIONE IDROLOGICA DEI CONSUMI EVAPOTRASPIRATIVI EFFETTIVI
L’incremento demografico mondiale degli ultimi decenni ha determinato una crescente richiesta di risorse idriche sia per usi civili ed industriali, che per l’agricoltura. Si stima, infatti, che nel 2030 il progressivo aumento della domanda di risorse idriche determinerà la difficoltà di accesso per circa metà della popolazione del pianeta (WWAP, 2012), soprattutto nelle regioni caratterizzate da climi aridi o semiaridi. I problemi connessi alla carenza di risorse idriche sono particolarmente rilevanti in agricoltura che, a scala globale, utilizza attualmente il 70% dell’intero utilizzo delle acqua proveniente dai corpi idrici superficiali e sotterranei (WWAP, 2014). L’uso finale di tali ris…
Statistical check of USLE-M and USLE-MM to predict bare plot soil loss in two Italian environments
2018
The USLE-M and the USLE-MM estimate event plot soil loss. In both models, the erosivity term is given by the runoff coefficient, QR, times the single-storm erosion index, EI30. In the USLE-MM, QREI30is raised to an exponent b1> 1 whereas b1= 1 is assumed in the USLE-M. Simple linear regression analysis can be applied to parameterize both models, but logarithmically transformed data have to be used for USLE-MM. Parameterizing the USLE-MM with nonlinear regression of untransformed data could be a more appropriate procedure. A statistical check of the two suggested models (USLE-M and USLE-MM), considering two alternative parameterization procedures for the USLE-MM, was carried out for the Mass…
Indici di erosività per la stima della perdita di suolo a scala di evento
2009
Measuring and Modelling Evaporation Losses from Wet Branches of Lemon Trees
2022
Evaporation losses of rainfall intercepted by canopies depend on many factors, including the temporal scale of observations. At the event scale, interception is a few millimetres, whereas at a larger temporal scale, the number of times that a canopy is filled by rainfall and then depleted can make the interception an important fraction of the rainfall depth. Recently, a simplified interception/evaporation model has been proposed, which considers a modified Merrian model to compute interception during wet spells and a simple power-law equation to model evaporation from wet canopy during dry spells. Modelling evaporation process at the sub hourly temporal scale required the two parameters of …
A comparison between the single ring pressure infiltrometer and simplified falling head techniques
2013
Testing the relative performances of the single ring pressure infiltrometer (PI) and simplified falling head (SFH) techniques to determine the field saturated soil hydraulic conductivity, Kfs, at the near point scale may help to better establish the usability of these techniques for interpreting and simulating hydrological processes. A sampling of 10 Sicilian sites showed that the measured Kfs was generally higher with the SFH technique than the PI one, with statistically significant differences by a factor varying from 3 to 192, depending on the site. A short experiment with the SFH technique yielded higher Kfs values because a longer experiment with the PI probably promoted short-term swe…