The following information was submitted:
Transactions: WSEAS TRANSACTIONS ON ENVIRONMENT AND DEVELOPMENT
Transactions ID Number: 27-565
Full Name: José Teixeira
Position: Associate Professor
Age: ON
Sex: Male
Address: Instituto Superior de Agronomia,1349-017 Lisboa
Country: PORTUGAL
Tel:
Tel prefix:
Fax:
E-mail address: jlteixeira@isa.utl.pt
Other E-mails: joaorolim@isa.utl.pt
Title of the Paper: Regional analysis and calibration for the South of Portugal of a simple evapotranspiration model for use in an autonomous landscape irrigation controller
Authors as they appear in the Paper: JOSÉ TEIXEIRA, SHAKIB SHAHIDIAN, JOÃO ROLIM
Email addresses of all the authors: jlteixeira@isa.utl.pt; shakib@uevora.pt; joaorolim@isa.utl.pt
Number of paper pages: 11
Abstract: Abstract: - This work is part of the development of an automatic and autonomous landscape irrigation controller which uses a simpler method for computing ETo than the FAO Penman-Monteith method (FAO-PM) in order to reduce the number of sensors required and lower the system cost. It is also intended to select a simple equation, since one of the requirements of this controller is that it should use an ETo formula with a reduced number of programming instructions due to its limited capacity. The controller to be developed should be autonomous and inexpensive, enabling it to be installed in small green areas such as small parks and gardens, having as main users the municipalities. Thus a regional analysis was made about the suitability of 6 methods for computing reference evapotranspiration (Hargreaves, Hargreaves-Samani, Jensen-Haise, Makkink, Priestley-Taylor and Turc) based only on the weather parameters temperature and solar radiation in the Alentejo. For this anal!
ysis a network of automatic weather stations was used, providing the meteorological data with a daily time-step for the period from 2003 to 2007. Results show that after the calibration, for each station, these methods present a good correlation with the ETo values calculated by the FAO-PM method. The best results were obtained by the Jensen-Haise method, and the worst results were computed by the Priestley-Taylor, Makkink, and Hargreaves-Samani methods. A considerable variation exists in the adjustment parameters from one weather station to another, so one can not use a single set of medium parameters to calibrate these functions for the entire region. Thus, it can be concluded that the Jensen-Haise is the best method for the Alentejo conditions, and it should be calibrated for each meteorological station. The results obtained by the Hargreaves-Samani method, based only on temperatures, are similar to other 5 methods and is the only one that does not need calibration, whic!
h indicates that this method can be considered for the elimination of
the radiation sensor.
Keywords: Evapotranspiration, Landscape irrigation, Water management, Hargreaves, Hargreaves-Samani, Jensen-Haise, Makkink, Priestley-Taylor, Turc
EXTENSION of the file: .pdf
Special (Invited) Session: Selection of a simplified method to compute evapotranspiration for climatic input on an autonomous controller for landscape irrigation
Organizer of the Session: 588-388
How Did you learn about congress:
IP ADDRESS: 193.136.146.3
