Estimating actual crop evapotranspiration using satellite-based surface energy balance and vegetation index methods

Name: Teerawat Suwanlertcharoen.

LCSH: Kasetsart University -- Dissertatoins. Ph.D. (Water Resources Engineering) 2023.

Classification :.LCCS: TC913.T48

LCSH: Kasetsart University. -- Department of Water Resources Engineering -- Dissertations.

LCSH: Water balance (Hydrology)

LCSH: Evapotranspiration.

LCSH: Landsat satellites.

LCSH: Water in agriculture.

LCSH: Plants -- Water requirements.

LCSH: Crops -- Water requirements.

Abstract: Evapotranspiration (ET) plays a significant role in the water balance, and the estimation of ET is crucial for understanding changes in water availability. Longan, which can only be produced under intensive water, occupies a considerable portion of the agricultural land area in northern Thailand. In addition, rice is cultivated in this area and requires much water during the dry season. In this research, the satellite-based surface energy balance using Mapping Evapotranspiration at high Resolution and with Internalized Calibration (METRIC) model derived from Landsat-8 imagery was utilized to estimate the spatiotemporal distribution of actual evapotranspiration (ETa) in the Northern Region of Thailand and to compare the ETa derived from the METRIC with that computed from the FAO-56 dual crop coefficient method using SIMDualKc software. Additionally, the satellite-based vegetation index (VI) method was employed to estimate crop evapotranspiration (ETc) and compared with ETa from METRIC. The results show that the ETa from the METRIC was close to the ETa from SIMDualKc. The accuracy evaluation for all sample plots at the satellite acquisition date, the R 2 , RMSE, and MAE values of 0.830, 0.730 mm, and 0.575 mm, respectively. The difference between the cumulative ETa from SIMDualKc and the METRIC varied from 0.93%–3.57% and 3.08%–7.99% for the rice and longan plots, respectively. ETa for the forestland and water bodies was higher than that for irrigated and non-irrigated agricultural areas. The correlation between the Normalized Difference Vegetation Index (NDVI) and crop coefficient (Kc) for rice was in good agreement with an R 2 of 0.74. Overall, compared to the NDVI-Kc method, ETa from the METRIC was lower for the rice plot and higher for the longan plot. The findings of this study suggest that the METRIC is an efficient tool for estimating ETa in the dry season and the spatiotemporal distribution of the ETa for various land use types at field scales. The METRIC can apply and contribute to optimizing irrigation scheduling and improving water management plans and dry season crop cultivation in the irrigation area. Moreover, the ETc derived from the NDVI-Kc method is suitable for application in areas with extensive monoculture cultivation and adequate water management.

Kasetsart University. Office of the University Library

Address: Bangkok

Email: tdckulib@ku.ac.th

Name: Kobkiat Pongput

Role: Thesis Advisor

Created: 2023

Modified: 2025-06-25

Issued: 2025-06-25

วิทยานิพนธ์/Thesis

วิทยานิพนธ์/Thesis

application/pdf

URL: http://www.lib.ku.ac.th/KUthesis/2566/teerawat-suw-all.pdf

CallNumber: TC913.T48.T44

eng

DegreeName: Doctor of Philosophy

Level: Doctoral Degree

Descipline: Water Resources Engineering

Grantor: Kasetsart University

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