Estimativa do fluxo de calor e da difusividade térmica do solo, baseado na solução da derivada temporal fracionária de meia ordem em ferramenta de software
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 th...
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Formato: | doctoralThesis |
Idioma: | por |
Publicado em: |
Universidade Federal do Rio Grande do Norte
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Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/19655 |
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Resumo: | 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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