Back to Search
Start Over
Evapotranspiration in Semi-Arid Climate: Remote Sensing vs. Soil Water Simulation.
- Source :
- Sensors (14248220); Mar2023, Vol. 23 Issue 5, p2823, 21p
- Publication Year :
- 2023
-
Abstract
- Estimating crop evapotranspiration (ET<subscript>a</subscript>) is an important requirement for a rational assessment and management of water resources. The various remote sensing products allow the determination of crops' biophysical variables integrated in the evaluation of ET<subscript>a</subscript> by using surface energy balance (SEB) models. This study compares ET<subscript>a</subscript> estimated by the simplified surface energy balance index (S-SEBI) using Landsat 8 optical and thermal infra-red spectral bands and transit model HYDRUS-1D. In semi-arid Tunisia, real time measurements of soil water content (θ) and pore electrical conductivity (EC<subscript>p</subscript>) were made in the crop root zone using capacitive sensors (5TE) for rainfed and drip irrigated crops (barley and potato). Results show that HYDRUS model is a fast and cost-effective assessment tool for water flow and salt movement in the crop root layer. ET<subscript>a</subscript> estimated by S-SEBI varies according to the available energy resulting from the difference between the net radiation and soil flux G<subscript>0</subscript>, and more specifically according to the assessed G<subscript>0</subscript> from remote sensing. Compared to HYDRUS, the ET<subscript>a</subscript> from S-SEBI was estimated to have an R<superscript>2</superscript> of 0.86 and 0.70 for barley and potato, respectively. The S-SEBI performed better for rainfed barley (RMSE between 0.35 and 0.46 mm·d<superscript>−1</superscript>) than for drip irrigated potato (RMSE between 1.5 and 1.9 mm·d<superscript>−1</superscript>). [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14248220
- Volume :
- 23
- Issue :
- 5
- Database :
- Complementary Index
- Journal :
- Sensors (14248220)
- Publication Type :
- Academic Journal
- Accession number :
- 162386778
- Full Text :
- https://doi.org/10.3390/s23052823