Field water loss research. Agricultural engineer (on ladder) and hydrologic technician determining the water loss from a field,by measuring the sensible heat flux with a large-aperture scintillometer (upper centre). The sensible heat flux is the amount of energy heating a surface without evaporating a liquid from it. This research is part of ongoing studies to preserve the Ogallala,one of the world's largest aquifers,an underground layer of water-bearing permeable rock,in the Great Plains of the USA | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Greb, Peggy / US Department of Agriculture |
Bildgröße: | 3403 px × 5161 px |
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