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Previous issue date: 2014-02-25 === O fluxo de calor e a difusividade t?rmica do solo s?o importantes componentes do balan?o de energia de superf?cie, particularmente para regi?es ?ridas e semi?ridas. O objetivo deste trabalho foi realizar a estimativa do fluxo de calor no solo, a partir da temperatura do solo medida em uma ?nica profundidade, baseado no m?todo da derivada fracion?ria de meia ordem proposta por Wang e Bras (1999), e estabelecer um m?todo capaz de estimar a difusividade t?rmica do solo baseado na derivada temporal fracion?ria de meiaordem da temperatura do solo. Os resultados de fluxo de calor no solo foram comparados com o fluxo de calor no solo medido atrav?s de 2 placas de fluxo, e a difusividade t?rmica estimada foi comparada com medidas realizadas ?in loco?. Os resultados obtidos mostram excelente concord?ncia entre o fluxo estimado a partir da solu??o adotada e o fluxo medido, permitindo estimativas de longo termo para o fluxo de calor no solo a partir da s?rie temporal de temperatura medida em uma ?nica profundidade, bem como os valores da difusividade t?rmica estimados pelo m?todo estabelecido se mostraram coerentes e concordantes com valores medidos ?in loco?, e com valores encontrados na literatura utilizando m?todos convencionais. === The soil heat flux and soil thermal diffusivity
are important components of the surface
energy balance, especially in ar
id and semi-arid regions. The obj
ective of this work was to
carry out to estimate the soil heat flux from th
e soil temperature measured at a single depth,
based on the half-order time derivative met
hod proposed by Wang and Bras (1999), and to
establish a method capable of es
timating the thermal diffusivity
of the soil, based on the half
order derivative, from the temporal series of
soil temperature at two depths. The results
obtained in the estimates of soil
heat flux were compared with
the values of soil heat flux
measured through flux plates, and the thermal di
ffusivity estimated was compared with the
measurements carried out in situ. The results
obtained showed excellent
concordance between
the estimated and measured soil heat flux, with
correlation (r), coeffici
ent of determination
(R
2
) and standard error (W/m
2
) of: r = 0.99093, R
2
= 0.98194 and error = 2.56 (W/m
2
) for
estimated period of 10 days; r = 0,99069, R
2
= 0,98147 and error = 2.59 (W/m
2
) for estimated
period of 30 days; and r = 0,98974, R
2
= 0,97958 and error = 2.77 (W/m
2
) for estimated
period of 120 days. The values of thermal di
ffusivity estimated by the proposed method
showed to be coherent and consis
tent with in situ measured va
lues, and with the values found
in the literature usi
ng conventional methods.
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