Search results for " eros."
showing 10 items of 418 documents
Distribuzioni di probabilità della perdita di suolo parcellare
2009
Calanchi landforms in south Italy: a comparison between Calabria and Sicilia case studies
2009
Analisi delle distribuzioni dimensionali delle gocce di pioggia rilevate mediante un disdrometro ottico
2008
Applicazione della USLE-MM per la stima distribuita della produzione di sedimenti
2011
Testing flow resistance equation for rill flow
2018
At first, in this paper a flow resistance equation for rill flow, deduced applying dimensional analysis and self-similarity theory, is presented. The incomplete self-similarity hypothesis is used for establishing the flow velocity distribution whose integration gives the theoretical expression of the Darcy-Weisbach friction factor. Then the deduced theoretical resistance equation, which is calibrated by some measurements of flow velocity, water depth, cross section area, wetted perimeter and bed slope carried out in 106 reaches of some rills modelled on an experimental plot, is tested using the literature data by Abrahams et al. (1996), Strohmeier et al. (2014) and Peng et al. (2015) for ri…
Evaluating the Effectiveness of Forest Crop to Mitigate Erosion Using a Sediment Delivery Distributed Model
1998
In this paper sediment yield data, measured from 1978 to 1997 in a small experimental Calabrian basin reafforested with Eucalyptus trees (Eucalyptus occidentalis Engl.), and RUSLE (Revised Universal Soil Loss Equation) coupled with a sediment delivery distributed model are used to evaluate the antierosive effects of this forest cover. At first, the soil loss measureinents carried out in two experimental plots, located in the basin, are used to evaluate the crop and management factor C of RUSLE far Eucalyptus coppice. The reliability of the selected C factor value is verified by comparing, at an event scale, the measured and the calculated sediment yield values at the basin outlet. Then, a M…
Analisi multitemporale della linea di costa con tecniche di fotogrammetria area ed immagini QuickBird
2009
Il lavoro descrive l’attività svolta dal Dipartimento di Rappresentazione dell’Università di Palermo in cooperazione con la locale Agenzia Regionale per la Protezione dell’Ambiente (ARPA Sicilia) relativamente all’analisi multitemporale della linea di costa in Sicilia. L’analisi è stata condotta mediante la produzione e il confronto di ortofoto realizzate da foto aeree e da immagini satellitari ad alta risoluzione a partire dal 1955 fino al 2006. In particolare, vengono presentati i primi risultati conseguiti per una unità fisiografica costiera utilizzata come zona test per le verifiche delle precisioni conseguibili.
El cuerpo docente Sexuación de la didáctica, eros pedagógico y autoridad magistral
2013
Assessing dye-tracer technique for rill flow velocity measurements
2018
Abstract Rill erosion is considered one of the most important processes affecting soil because of the large amount of soil loss. The rill network acts as sediment source and is able to transport both rill flow-detached particles and those delivered from the interrill areas. Small flow depth in a rill and steep slope values of its bed affect significantly flow hydraulics. When rill flow velocity is measured using a dye-tracing method, the mean velocity is calculated by multiplying the measured surface velocity of the leading edge of the tracer plume by a correction factor. The main uncertainty of the dye-tracing technique stands in the relationship between mean and surface flow velocity. In …
Modelling of piping collapses and gully headcut landforms: Evaluating topographic variables from different types of DEM
2021
Abstract The geomorphic studies are extremely dependent on the quality and spatial resolution of digital elevation model (DEM) data. The unique terrain characteristics of a particular landscape are derived from DEM, which are responsible for initiation and development of ephemeral gullies. As the topographic features of an area significantly influences on the erosive power of the water flow, it is an important task the extraction of terrain features from DEM to properly research gully erosion. Alongside, topography is highly correlated with other geo-environmental factors i.e. geology, climate, soil types, vegetation density and floristic composition, runoff generation, which ultimately inf…