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Riparian zone as a variable source area for the estimation of evapotranspiration through the analysis of daily fluctuations in streamflow

Abstract
Evapotranspiration is a critical component of the water balance of a catchment, and riparian zones play a crucial role in the hydrological process. However, the influence of riparian zones on evapotranspiration, especially at a catchment scale, needs more investigation. Since evapotranspiration is negligible at night, the difference in recharge between day and night generates diurnal fluctuations in streamflows. A new method is developed to estimate riparian evapotranspiration by analysing the streamflow response to diurnal evapotranspiration. The potential evapotranspiration (PET) calculated by FAO-56 is used as a true reference for validation. The estimated evapotranspiration shows acceptable goodness of fit with the hourly PET calculated from FAO 56. However, the new approach estimates average evapotranspiration across the entire riparian area than a point observation and provides a better understanding of the impact of the riparian zone on streamflow patterns.
Type
Journal Article
Type of thesis
Series
Citation
Date
2022-09-23
Publisher
Wiley
Degree
Supervisors
Rights
This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.© 2022 The Authors. Hydrological Processes published by John Wiley & Sons Ltd.