Actual evapotranspiration estimation for different land use and land cover in urban regions using Landsat 5 data

Wenjuan Liu; Yang Hong; Sadiq Ibrahim Khan; Mingbin Huang; Baxter Vieux; Semiha Caliskan; Trevor Grout

doi:10.1117/1.3525566

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1 November 2010 Actual evapotranspiration estimation for different land use and land cover in urban regions using Landsat 5 data

Wenjuan Liu, Yang Hong, Sadiq Ibrahim Khan, Mingbin Huang, Baxter Vieux, Semiha Caliskan, Trevor Grout

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J. of Applied Remote Sensing, 4(1), 041873 (2010). https://doi.org/10.1117/1.3525566

Abstract

Evapotranspiration (ET) is deemed critical for water resources management. Even in the same climatic and meteorological conditions, actual ET (ET_a) may exhibit remarkable spatial variability across different vegetation covers, agricultural land use practices, and differing types of urban land development. The main objectives of this study are (1) to evaluate the possible closure of the heat balance equation using Oklahoma's unique environmental monitoring network; and (2) to estimate ET_a and determine the variation with regards to varying types of land use and land cover in urban settings. In this study, a Surface-Energy-Balance ET algorithm was implemented to estimate ETa at a higher spatial resolution using Landsat 5 satellite images while the Oklahoma Mesonet observations can be used as our ground truth data. Accuracy of the estimated ET_a was assessed using latent heat flux measurements provided by AmeriFlux towers. The associated bias ratios of daily mean ET_a with respect to both burn and control sites are -0.92%, and -8.86% with a correlation of 0.83 and 0.81, respectively. Additionally, estimated ET_afrom a water balance budget analysis and the remotely sensed ET_a are cross-validated with a low bias ratio of 5.2%, and a correlation coefficient of 0.7 at the catchment scale. The lowest ET_a was observed for developed urban areas and highest for open water bodies. The ET_a difference is also demonstrated from two contrasting counties. The results show Garfield County (agricultural) has higher ET_a values than Oklahoma County (urban) for all land cover types except open water bodies.

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Wenjuan Liu, Yang Hong, Sadiq Ibrahim Khan, Mingbin Huang, Baxter Vieux, Semiha Caliskan, and Trevor Grout "Actual evapotranspiration estimation for different land use and land cover in urban regions using Landsat 5 data," Journal of Applied Remote Sensing 4(1), 041873 (1 November 2010). https://doi.org/10.1117/1.3525566

Published: 1 November 2010

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