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Universidade Federal Rural de Pernambuco (2007)

Avaliação de lavagem incompleta de sais em neossolo flúvico utilizando modelagem computacional

Normandia Monteiro Adriano Luiz

Titre : Avaliação de lavagem incompleta de sais em neossolo flúvico utilizando modelagem computacional.

Auteur : Normandia Monteiro Adriano Luiz

Université de soutenance : Universidade Federal Rural de Pernambuco

Grade : Doutor em Agronomia Cienca do Solo 2007

Résumé
This study has been developed in two locations which are typical of communal agriculture in the Northeast semi-arid, in alluvial valleys : Nossa Senhora do Rosário Farm, municipal district of Pesqueira, in the agreste area of Pernambuco State and another in the municipal district of Belo Jardim-PE. The objective was to evaluate a computational model to simulate scenarios involving salinization in alluvial soils in the semi-arid Northeast and to simulate the reduction effect on soil salinity in drainage leaching lisimeters and the precipitation as an element to reduce salt content. Based on numeric simulations with finite elements, using the model HYDRUS-1D, it was evaluated flow and transport of salts. For model calibration, of the model field data of water content and soil water pressure head, electric conductivity of soil solution, in adition to soil water characteristic parameters. Using measured actual evapotranspiration of the crop separated : potential evaporation (Ep) and potential transpiration (Tp), and precipitation, besides irrigation with different leaching depths, it was verified that the model is a satisfactory tool to simulate flow and transport in the studied situations. The leach should be used as handling for reduction of the salinity in the root zone since effectiveprecipitations can drain in the winter periods. Incomplete leaching can be an effective alternative to reduce salinity in the root zone, when rainfall might occur.

Mots clés  : Lavagem de sais ; Modelagem ; Aquífero aluvial ; Salinidade ; Semi-árido ; Solos aluviais ; salinity ; alluvial soils ;

Présentation (RCAAP)

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Page publiée le 13 décembre 2015, mise à jour le 6 juillet 2017