[Aerial photography during drought as source of geological informations in Wallonia [South Belgium]] | La photographie aerienne en periode de sechersse comme source de renseignements geologiques en Wallonie
2001
Quoilin, H. | Ozer, A. | Cornet, Y. | Pissart A. (Universite de Liege, Sart Tilman (Belgium). Institut de Geographie. Lab. de Geomorphologie et de Teledetection)
Aerial photographs taken in Wallonia during periods of drought have been shown to be of great interest for geological mapping. Nearly 500 pictures allow, by means of hydrologic stress of plants, recognition of the geologic structure of areas where there is no outcrop. The direction of stratification, and also locally the folds and fault traces, appear in the zones where, at shallow depth (up to more than two metres), the different natures of the bedrock determine variations in stress that plants are subjected to. The visible structures vary as a function of the development of the drought and in relation to the type of occupation of the soil. Up to the present, satellite images do not permit us to observe these structures, but improvements in resolution will make it possible
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