Use of canopy coefficients obtained from satellite data to estimate evapotranspiration over high mountain Mediterranean watersheds
2018
Abstract. This work explores the dynamics of the water consumed by the
vegetation in two Mediterranean watersheds of Sierra Nevada Mountains
(Southern Spain). This region has experienced an increase in the demand of
water in the last years due to the growth of irrigated areas, and a new water
resources plan is required. The evapotranspiration (ET) of irrigated
horticultural crops and natural communities were monitored for the
hydrological years 2013/14 and 2014/15, using an approach based on the
concept of reference evapotranspiration (ET o ) and canopy
coefficients derived from the computation of vegetation indices (VIs),
which we will call the VI-ET o approach. A set of Landsat-8 and
MODIS images has been used as remote input data. The results were used for
the spatial analysis of water consumption in terms of the main land cover
types in the area. The annual runoff obtained with a simple surface water
balance, using the ET values estimated by the VI-ET o approach,
was comparable to that obtained by the HBV (Hydrologiska Byrans
Vattenbalansavdelning) model, a precipitation-runoff generation model that
reproduces the observed river discharge at the outlet of the watershed.
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