Closure of Experimental analysis of local pressure losses for microirrigation laterals.

L'approvvigionamento idrico per l'agricoltura

La monografia contiene la descrizione delle fonti di approvvigionamento idrico da acque superficiali e sotterranee, con particolare riferimento alla impostazione del dimensionmento idraulico ed alle problematiche tecniche riguardanti i laghetti collinari costruiti in alveo e fuori alveo.

Assessing a computational fluid dynamic technique (CFD) to evaluate pressure losses in drip irrigation laterals

Verifica idraulica degli impianti per la microirrigazione attraverso una procedura di calcolo matriciale

Disponibilità idriche e fabbisogni in Sicilia

Estimation of actual evapotranspiration of Mediterranean perennial crops by means of remote-sensing based surface energy balance models

Abstract. Actual evapotranspiration from typical Mediterranean crops has been assessed in a Sicilian study area by using surface energy balance (SEB) and soil-water balance models. Both modelling approaches use remotely sensed data to estimate evapotranspiration fluxes in a spatially distributed way. The first approach exploits visible (VIS), near-infrared (NIR) and thermal (TIR) observations to solve the surface energy balance equation whereas the soil-water balance model uses only VIS-NIR data to detect the spatial variability of crop parameters. Considering that the study area is characterized by typical spatially sparse Mediterranean vegetation, i.e. olive, citrus and vineyards, alterna…

Estimation of Mediterranean crops evapotranspiration by means of remote-sensing based models

Abstract. Actual evapotranspiration from typical Mediterranean crops has been assessed in a Sicilian study area by using Surface Energy Balance and Agro-Hydrological models. Both modelling approaches require remotely sensed data to estimate evapotranspiration fluxes in a spatially distributed way. The first approach exploits visible (VIS), near-infrared (NIR) and thermal (TIR) observations to solve the surface energy balance equation. To this end two different schemes have been tested: the two-sources TSEB model, where soil and vegetation components of the surface energy balance are treated separately, and the widely used one-source SEBAL model, where soil and vegetation are considered as a…

Closure to “Experimental Analysis of Local Pressure Losses for Microirrigation Laterals” by Giuseppe Provenzano and Domenico Pumo

SUITABILITY OF HYDRUS-2D SIMULATION MODEL TO ASSESS WATER AND SOLUTE TRANSPORT INTO THE SOIL

Simplified Procedure to Evaluate Head Losses in Drip Irrigation Laterals

The lateral lines of a drip irrigation system consist of pressurized pipelines with inline or online emitters. Proper hydraulic design of drip laterals usually requires the accurate evaluation of the total head losses, represented by friction losses along the pipe and the emitters, and local losses due to the emitter connections. This paper extends the local loss evaluation procedure, previously obtained for coextruded laterals, on the basis of new experiments. In addition, a simplified procedure was proposed based on the constant outlet discharge assumption for a quick evaluation of total head losses in drip irrigation lines, taking into account the total local loss due to the emitter conn…

A simplyfied design procedure for drip irrigation laterals

La progettazione dei laghetti collinari. ATTI DEL SEMINARIO ORGANIZZATO DAL GENIO CIVILE DI PALERMO, DAL DIPARTIMENTO DI INGEGNERIA IDRAULICA ED APPLICAZIONI AMBIENTALI E DALL'ASSOCIAZIONE IDROTECNICA ITALIANA. PALERMO, 31 MARZO 2004

Valutazione della performance di impianti per la microirrigazione mediante misure di efficienza ed uniformità della distribuzione

Impianti di microirrigazione per la distribuzione di acque reflue

Uso del modello di simulazione HYDRUS-2D per lo studio dei processi di trasporto di soluti nel terreno

Prospettive di ricerca in tema d'irrigazione.

Experimental Analysis of Local Pressure Losses for Microirrigation Laterals

The accurate design of drip irrigation laterals needs to consider the variation of hydraulic head due to pipe elevation changes, head losses along the lines, and also, at a given operating pressure, emitter discharge variations related to manufacturing variability, clogging, and water temperature. Hydraulic head variations are consequent to both the friction losses and local losses due to the in-line or on-line emitters along the pipe, which determine the contraction and subsequent enlargement of the flow streamlines. Moreover, in-line emitters usually have a smaller diameter than the pipe, and therefore an additional friction loss must be considered. Evaluation of energy losses and consequ…