Palaeochannels of the Namoi River floodplain, New South Wales, Australia : the use of multispectral Landsat imagery to highlight a Late Quaternary change in fluvial regime

Auteur(s) et Affiliation(s)



Description :
This study finds that combining and enhancing multiple bands of Landsat 7 ETM+ data improves subtle differences in the spectral reflection of soil moisture and vegetation, aiding palaeochannel identification. These results are much better than using single band data alone in this important agricultural area, one suffering strong water and soil resource pressures. There are several generations of palaeochannels visible on this floodplain, and analysis shows they were very different from the modern rivers : greater discharges, longer meander wavelengths and they flowed along different courses to the modern rivers. This study supports other recent investigations of the geomorphology and chronology of the Namoi River floodplain that showed that these changes only occurred during Late Quaternary.


Type de document :
Article de périodique

Source :
Australian Geographer, issn : 0004-9182, 2009, vol. 40, n°. 1, p. 29-49, nombre de pages : 21, Références bibliographiques : 2,5 p.

Date :
2009

Editeur :
Pays édition : Australie, Sydney, Geographical Society of New South Wales