Encontrados 6 documentos, a visualizar página 1 de 1
Efeitos da rega e do regime hídrico em olival super intensivo no Alentejo
Santos, Francisco Lúcio; Correia, Maria Manuela; Coelho, Renato; Sousa, Adélia; Paço, Teresa; Pereira, Luís SantosO presente estudo caracteriza os efeitos de uma condução típica de rega em olival super-intensivo (1,35 x 3,75 m) na região de Évora (Alentejo) e em solo Cambissolo Êutrico (WRB, 1998). Analisa-se o regime hídrico praticado em dois tratamentos de rega, normal (FI) e deficitário (DI), este com redução da dotação de rega depois do endurecimento do caroço e seus efeitos sobre a transpiração, a humidade do solo e ...
Mathematical Modelling and Field Study of Unsteady Flow in an Irrigation Canal ...
Rijo, Manuel; Almeida, António Betâmio; Pereira, Luís SantosA computer model for simulation of upstream controlled canal systems, based on the Saint-Venant system of equations, was developed. The system of equations are solved by a four-point linear finite-difference implicit scheme, weighted in time and space. The final linear system of equations is solved by the double-sweep algorithm. The model, a stability and sensitivity analysis of the numerical method are present...
Modelling automatic upstream control with SIMCAR
Rijo, Manuel; Almeida, António Betâmio; Pereira, Luís SantosThe model SIMCAR solves the gradually varied unsteady flow in a branched canal network with upstream control, with particular attention given to the simulation of the AMIL radial gates. It is based on the Saint-Venant system of equations, which are solved by a finite-difference technique with a four-point implicit scheme weighted in time and space. model calibration and validation are made for the canal network...
Simulation of Transient Flows in Irrigation Canals: Automatic AMIL Radial Gates
Rijo, Manuel; Almeida, António Betâmio; Pereira, Luís SantosThe computer model SIMCAR for simulation of upstream controlled canal systems was developed. The model solves the gradually unsteady flow in a branched canal network, regarding the singularities: AMIL radial gates, siphons, transitions and confluences. The model is based on the Saint-Venant systems of equations, which are solved by a four-point linear finite-difference implicit scheme weighted in time and space...
From upstream to real time management: research for modeling in a surface irrig...
Pereira, Luís Santos; Rijo, Manuel; Teixeira, José LuísThe Sorraia Irrigation Project is a well operated surface irrigation system but conceived decades ago. Modernization is needed to increase conveyance and distribution efficiencies, to improve flexibility of the system, to adequate it to modern exigences needs, to provide improved utilization of available water and other natural resources. This is not possible maintaining traditional upstream control but implem...
Application of a Numerical Implicit Model to an Irrigation Canal
Rijo, Manuel; Pereira, Luís Santos; Almeida, António BetâmioA case study is presented regarding an application of a computational model to the unsteady flow in an irrigation canal, using an implicit numerical technique. The Saint-Venant equations of continuity and momentum for one-dimensional gradually varied flow were written in a finite-difference form. The system of equations was solved by the double-sweep algorithm. A computer program was written to solve the proble...
| Financiadores do RCAAP | |||||||
|
|
|
|
|
|
||