Variable source areas, soil moisture and active microwave observations at Zwalmbeek and Coët-Dan
| dc.contributor.author | Troch, Peter A. | |
| dc.contributor.author | Verhoest, Niko E.C. | |
| dc.contributor.author | Gineste, Philippe | |
| dc.contributor.author | Paniconi, Claudio | |
| dc.contributor.author | Mérot, Philippe | |
| dc.date.accessioned | 2014-06-13T07:56:47Z | |
| dc.date.available | 2014-06-13T07:56:47Z | |
| dc.date.issued | 2000 | |
| dc.description.abstract | This chapter focuses on recent research to identify variable source areas from surface soil moisture dynamics observed at the catchment scale by means of active microwave images from satellites. It is hypothesized that variable source areas can be mapped if we can quantify the temporal variability of the surface soil moisture content. It is difficult to determine the soil moisture content from single synthetic aperture radar images because soil moisture, surface roughness, topography and vegetation all have a great effect on radar backscatter. However, seasonal soil moisture fluctuations can be studied by using multitemporal radar images. Two multitemporal image processing techniques are presented to map variable source areas. The first method computes the temporal standard deviation of radar backscatter. This leads to the definition of the so-called saturation potential index, which compares well with observed saturated areas. The second method makes use of a principal component analysis to separate the dominant effects, like topography, land use and soil moisture, on total radar backscatter. Again this leads to reliable mapping of the spatial patterns of variable source areas. Two humid catchments, the Zwalmbeek in Belgium and the Coët-Dan in France, are used in this study. | IT |
| dc.identifier.uri | http://hdl.handle.net/11050/1015 | |
| dc.language.iso | en | IT |
| dc.subject | soil moisture | IT |
| dc.subject | radar images | IT |
| dc.subject | hillslopes | IT |
| dc.subject.een-cordis | EEN CORDIS::PROTEZIONE DELL'UOMO E DELL'AMBIENTE ::Ambiente::Inquinamento delle acque / trattamento | IT |
| dc.title | Variable source areas, soil moisture and active microwave observations at Zwalmbeek and Coët-Dan | IT |
| dc.type | Report | IT |