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National Repository of Grey Literature 1 records found  Search took 0.01 seconds. 
Determination of recharge zones by means of vegetation water stress based on remote sensing and ground measurements
 Duffková, R. ; Brom, J. ; Žížala, D. ; Zemek, František ; Procházka, J. ; Nováková, E. ; Zajíček, A. ; Kvítek, T.
The watershed recharge zones with high soil permeability are critical source zones of non-point agricultural pollution. Their delimitation is the condition of targeted agricultural management in protection zones of water resources. The accelerated water runoff from permeable soils of recharge zones reduces actual evapotranspiration and supports faster formation of vegetation water stress in comparison with other watershed parts. Recharge zones delimitation upon this theory was carried out on a small watershed (partially drained) by a combination of aerial photography in the infrared and optical spectrum of electromagnetic radiation, which provided a basis for modelling of surface energy balance components and crop water stress index (CWSI). The best indicators of vegetation water stress determined by statistical analyzes in order to define recharge zones (arable land with closed stand) were revealed evaporation fraction, CWSI and surface temperature. The results were supported by detailed pedological survey.
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