Journal
HYDROLOGICAL SCIENCES JOURNAL-JOURNAL DES SCIENCES HYDROLOGIQUES
Volume 58, Issue 5, Pages 1144-1161Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/02626667.2013.802322
Keywords
thermal inertia; surface soil water content; remote sensing; inertie thermique; teneur en eau de la surface du sol; teledetection
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The thermal inertia method to retrieve surface soil water content maps on bare or sparsely-vegetated soils is analysed. The study area is a small experimental watershed, where optical and thermal images (in day and night time) and in situ data were simultaneously acquired. The sensitivity of thermal inertia to the phase difference between incoming radiation and soil temperature is demonstrated. Thus, to obtain an accurate value of the phase difference, the temporal distance between thermographs using a three-temperature approach is evaluated. We highlight when a cosine correction of the temperature needs to be applied, depending on whether the thermal inertia formulation includes two generic acquisition times, or not. Finally, the deviation in soil water content retrieval is quantifies for given values of each parameter by performing a sensitivity analysis on the basic parameters of the thermal inertia method that are usually affected by calibration errors. Citation Maltese, A., Bates, P.D., Capodici, F., Cannarozzo, M., Ciraolo, G., and La Loggia, G., 2013. Critical analysis of thermal inertia approaches for surface soil water content retrieval. Hydrological Sciences Journal, 58 (5), 1144-1161. Editor D. Koutsoyiannis; Associate editor D. Hughes Resume La methode de << l'inertie thermique >> pour la cartographie de la teneur en eau de la surface des sols nus ou a vegetation clairsemee est analysee. La zone d'etude est un petit bassin versant experimental, oU des images optiques et thermiques (de jour et de nuit) et des donnees in situ ont ete acquises simultanement. On a mis en evidence la sensibilite de l'inertie thermique a la difference de phase entre le rayonnement incident et la temperature du sol. Ainsi, pour obtenir une valeur precise de la difference de phase, nous avons evalue la distance temporelle entre thermographes en utilisant une approche a trois temperatures. Cet article montre la necessite eventuelle d'une correction cosinusoidale de la temperature, selon que la formulation de l'inertie thermique comprend ou non deux temps d'acquisition generiques. Enfin, l'article quantifie la variabilite de la teneur en eau du sol pour des valeurs donnees de chaque parametre en effectuant une analyse de sensibilite sur les parametres de base de la methode de l'inertie thermique qui sont generalement affectes par des erreurs d'etalonnage. Citation Maltese, A., Bates, P.D., Capodici, F., Cannarozzo, M., Ciraolo, G., and La Loggia, G., 2013. Critical analysis of thermal inertia approaches for surface soil water content retrieval. Hydrological Sciences Journal, 58 (5), 1144-1161. Editor D. Koutsoyiannis; Associate editor D. Hughes
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