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Pedro Leão de Sousa Tiago Mora Jorge Technical University of Lisbon High Institute of Agronomy

MECAR Metodologia para a Estimativa do Consumo de Água de Rega em Portugal Methodology to Estimate the Irrigation Water Consumption in Portugal. Pedro Leão de Sousa Tiago Mora Jorge Technical University of Lisbon High Institute of Agronomy Center of Tropical Studies for Development

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Pedro Leão de Sousa Tiago Mora Jorge Technical University of Lisbon High Institute of Agronomy

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  1. MECARMetodologia para a Estimativa doConsumo de Água de Rega em PortugalMethodology to Estimate the Irrigation Water Consumption in Portugal Pedro Leão de Sousa Tiago Mora Jorge Technical University of Lisbon High Institute of Agronomy Center of Tropical Studies for Development Statistics Portugal

  2. Target To evaluate the amount of irrigation water used in each farm, by crop, during the crop year of 2009 Difficulties The farmers usually doesn't recorded the applied irrigation water The meteorological conditions along the country presents a strong variation The farm characteristics, in which concerns technological development, size and crops, are scattered The skill of each farmer to handle and manage their irrigation system is quite different

  3. To overcome these difficulties Our team is developing a Methodology to Estimate the Irrigation Water Consumption in Portugal (MECAR), respecting and fitted to the national agriculture specificity. This methodology includes The use of a simulation model (ISAREG) The meteorological data of evapotranspiration, precipitation and soil moisture content The soil characteristics The irrigation systems efficiency

  4. ISAREG is a simulation model developed in the Technical University of Lisbon / High Institute of Agronomy by Prof. J.L. Teixeira (1994)

  5. In which concerns the available evapotranspiration of the country, it was defined a set of influence zones, in view the application of the model results for each farm, inside each one of these zones North N1-N15 Meteorological Station Center C1 – C20 South S1 – S14

  6. For each area of influence are run simulations with ISAREG, for the main type of soils

  7. Finally, for each area of influence and type of soil the model is applied for each one of the crops cultivated in the area. Permanent Crops Temporary Crops

  8. For one zone of influence it is foreseen a number of simulations, in accordance with the following example:

  9. Expanding this exercise to the country:

  10. With the results of all these simulations can be built a table with the form: (Small administrative unit)

  11. These values of water crop consumption have to be corrected upon the irrigation system efficiency • For a given irrigation system are considered 3 efficiency levels: • Level 1 – Low efficiency • Level 2 – Intermediate efficiency • Level 3 – High efficiency

  12. Irrigation system efficiency evaluation

  13. Level of efficiency and irrigation efficiency The irrigation efficiency (Ei) in a given farm must be obtained by the product of the maximum irrigation efficiency (Eimax) and a factor of correction (Fc) fixed as 0,7; 0,85 and 1, according to: In the example presented and for a sprinkler irrigation system, with a potential maximum efficiency (Eimax) of 75%: FWL = 2,35 Level 2 (Fc=0,85) Ei = 75 x 0,85 = 63,75 %

  14. The simulation model ISAREG will be previously used with a set of 20 years of meteorological data to generate all the information above mentioned. It is foreseen that some field observations will be carried out during the Spring 2009 to validate this methodology. At the beginning of 2010, if possible, all the information achieved with the model for the average meteorological data (set of 20 years), will be corrected with simulations based on meteorological data of year 2009.

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