Encontrados 24 documentos, a visualizar página 1 de 3
Efeitos das alterações climáticas nas necessidades úteis de rega na bacia do Gu...
Valverde, Pedro; Serralheiro, Ricardo; Carvalho, Mário de; Shahidian, Shakib; Rodrigues, CarlosInvestigou-se a tendência de variação das necessidades úteis de rega com as alterações climáticas na bacia hidrográfica do Guadiana para as principais culturas agrícolas de regadio com mais importância na região. Nesta análise aplicou-se o modelo de balanço hídrico do solo ISAREG e utilizaram-se as séries de variáveis climáticas registadas localmente entre 1963 e 2009. Os resultados das séries climáticas indica...
Climate change in Guadiana river basin and its impacts on crop water demand
Valverde, Pedro; Serralheiro, Ricardo; Carvalho, Mário; Shahidian, ShakibThis study evaluates climate change tendencies over several climatic parameters observed in the Guadiana river basin, south Portugal and its potential impacts on crop water and irrigation requirements. Parameters analyzed were annual rainfall and its seasonal distribution, temperature and evapotranspiration, collected from available regional meteorological data from a 46-year period (1963-2009). The impacts of ...
Workshop Horticultura no contexto urbano
Shahidian, Shakib; Sousa, Adélia; Ilhéu, Maria; Perdigão, JoanaA importância do crescente fenómeno de Hortas em contexto urbano e seu enquadramento social e ambiental.
Irrigation management with remote sensing techniques. Crop water requirements a...
Toureiro, Célia; Serralheiro, Ricardo; Shahidian, ShakibIn irrigated agriculture, increasing water management efficiency is the way to save water and to render irrigation a sustainable activity. In the present work procedures with remote sensing are used to determine the contents of available water in the soil at each moment and therefore the opportunity for the application of the water volume strictly necessary to optimize crop growth (irrigation opportunity and ir...
Practical issues in developing a smart surface irrigation system with real-time...
Shahidian, Shakib; Serralheiro, Ricardo; Serrano, João ManuelAutomation of surface irrigation can be an economic and ecological way of increasing global food production. In this work a fully automated cablegation system is evaluated that adapts the application time and depth to the actual infiltration rate of the soil in real-time. The system calculates the infiltration equation from advance times in a control furrow and then simulates irrigation in every furrow of the f...
Parametric calibration of the Hargreaves–Samani equation for use at new locations
Shahidian, Shakib; Serralheiro, Ricardo; Serrano, João Manuel; Teixeira, José LuísThe Hargreaves–Samani (HS) evapotranspiration equation is very useful for the on-site irrigation management in data-short situations such as small and midsize farms and landscaped areas. Although much work has been performed to improve the precision of the evapotranspiration (ETo) estimates for use at new locations, the results have not been consistent and many have not been confirmed by other works. The purpos...
Estudo comparativo das alterações climáticas e da sua influência sobre as neces...
Shahidian, Shakib; Teixeira, José Luís; Serrano, João Manuel; Rolim, JoãoÉ geralmente aceite que o aumento das emissões de gases com efeito de estufa, e a utilização extensiva de combustíveis fósseis está a provocar uma alteração climática ao nível mundial. O crescimento das culturas é muito afectado pelo clima e as suas alterações podem afectar seriamente a segurança alimentar a nível global. Por outro lado, as reservas de água para a rega estão a diminuir e é importante avaliar os...
Comparative Study of smart irrigation control in greenhouses
Shahidian, Shakib; Serralheiro, Ricardo; Serrano, João Manuel; Machado, Rui ManuelWith greenhouses it is possible to increase crop production and reduce significantly the water use. Additionally advancements in electronics and shortage of water have led to the development of “smart” or adaptive irrigation controllers that adjust the water application depth to plant needs, and thus increase water savings. The two most common types are soil moisture based and evapotranspiration based systems. ...
Electrónica e Automação com Arduino
Shahidian, ShakibUm curso prático de Arduino para principantes e todos os interessados na electrónica e programação.
Development of an adaptive surface irrigation
Shahidian, Shakib; Serralheiro, RicardoCablegation is a simple system for automating surface irrigation in small and medium-sized fields using a gated pipe. In this work, a Programmable Logic Control, PLC, was used to develop an adaptive cablegation system capable of establishing the infiltration equation in real time and then adjusting the irrigation times to the infiltration rate and field geometry. A controlling program was developed for the on-f...
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