Open AccessEstimation of soil temperature by Harmonic analysis
Author(s) -
Manjusha Kulshrestha,
A. M. Shekh
Publication year - 2001
Publication title -
mausam
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.243
H-Index - 12
ISSN - 0252-9416
DOI - 10.54302/mausam.v52i2.1705
Subject(s) - harmonic analysis , harmonics , amplitude , mathematics , harmonic , soil test , range (aeronautics) , statistics , soil science , environmental science , physics , materials science , soil water , mathematical analysis , acoustics , optics , quantum mechanics , voltage , composite material
Soil temperatures recorded at 5.10 and 20 cm depth at Anand station of Gujarat state for the period of 1982-93 were analyzed by harmonic analysis and tested it for the year 1998. The amplitude of the soil temperature wave for the various depths decreases from a maximum of 5.76° C in the first harmonic to 0.96°C in the third harmonic. First, second and third harmonic explained 55 to 76 percent, 18 to 37 percent and 2 to 4 percent of the total variance, respectively. Total percentage of total variance covered by the three harmonics at different depths are in the range of 95 to 97 percentage for the period of 1982-93 normalized data series which shows the applicability of harmonic analysis in describing soil temperatures.
The weekly observed and computed soil temperatures by harmonic analysis were in agreement and their differences were non significant by Chi-Square test.