Kerman Weighing Electronic Lysimeter
Error Analysis
Author(s)
B. Bakhtiari, R. Kamyab Moghadas, M. J. Khanjani & H. Taraz
Abstract
Lysimeter is an important instrument to measure evapotranspiration in the field
of irrigation management. The error analysis and calibration of the system is
very critical for quality control of collected data. The error sources are many and
different. The Kerman weighing electronic lysimeter is a complex of two
cultivation tanks, load cells, data logger, and data processing weighing system
with 48 m2 under ground building. In this study, ten-minute interval measured
evapotranspiration data were analyzed. The Fourier’s series were used to model
discrete measured time depended evapotranspiration data. By differentiation of
the fitted model the quantity of selected time interval evapotranspiration was
computed. By comparing the measured and estimated data the time depended
errors were calculated. Computed errors were analyzed, and the statistical
distributions of the errors were discussed.
Keywords: evapotranspiration, ET, weighing lysimeter, error analysis, Kerman.
1 Introduction
Crop evapotranspiration (ET) is a major component of any local hydrologic
system. It is an important factor in planning and developing water resources. It
should be estimated as correctly as close to avoid any consequence of over or
under estimating in local water resources planning. Lysimeter is an instrument to
measure actual crop evapotranspiration in field of agricultural irrigation
management. It has been used in the United States since the 1930s mainly to
measure evapotranspiration (Malone et al. [1]). An excellent summary of
Keywords
evapotranspiration, ET, weighing lysimeter, error analysis, Kerman.
Related Book
Other papers in this volume
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