Soil moisture profile estimation under bare and vegetated soils using combined L-band and P-band radiometer observations: An incoherent modeling approach - Archive ouverte HAL
Article Dans Une Revue Remote Sensing of Environment Année : 2024

Soil moisture profile estimation under bare and vegetated soils using combined L-band and P-band radiometer observations: An incoherent modeling approach

Résumé

Understanding the distribution of moisture throughout the soil profile is crucial for effective water management in the field of agriculture. This knowledge enables farmers and water managers to make informed decisions regarding the timing and amount of irrigation needed to optimize crop growth. To estimate the soil moisture profile, this study utilized L-band and P-band radiometry with three multilayer incoherent models, based on a zero-order (IZ), first order (IF), and incoherent solution (IS) approximation, as well as the conventional tau-omega (TO) model. The result of these models was also compared with the coherent model results published by Brakhasi et al. (2023). Two mathematical shape functions - linear (Li) and second-order polynomial (Pn2) - were used to represent the soil moisture profile. Observations from a tower-based experiment were used under different land cover conditions, namely bare, bare-weed, grass, wheat, and corn. The Root Mean Square Error (RMSE) was calculated between the observed and estimated soil moisture profiles, with the results indicating that RMSE values were similar for all four radiative transfer models, with the Pn2 function outperforming the Li function in deeper layers. The multilayer incoherent models generated slightly better results than the conventional TO model, particularly for the shallow layers, but their complexity was not justified for the small gain in performance. Additionally, the comparison between conventional and multi-layer incoherent models with stratified coherent Njoku model was reveal that the latter slightly outperformed the formers under dry bare soil condition. The conventional TO model provided an average profile estimation depth ranging from 1cm (under corn) to 39cm (under bare), depending on the soil moisture profile gradient and value in the shallow layers. These findings pave the way for estimating soil moisture profile on a global scale using combined L-band and P-band radiometry from future satellite missions operating at these two bands.
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Dates et versions

hal-04608973 , version 1 (12-06-2024)

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Foad Brakhasi, Jeffrey P Walker, Jasmeet Judge, Pang-Wei Liu, Xiaoji Shen, et al.. Soil moisture profile estimation under bare and vegetated soils using combined L-band and P-band radiometer observations: An incoherent modeling approach. Remote Sensing of Environment, 2024, 307, pp.114148. ⟨10.1016/j.rse.2024.114148⟩. ⟨hal-04608973⟩
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