Quantification of braided river channel change using archival digital image analysis

Auteur(s) et Affiliation(s)

LANE, S.N.

Inst. of Hazard and Risk Research and Dept. of Geography, Univ., Durham, Royaume-Uni

WIDDISON, P.E.

Inst. of Hazard and Risk Research and Dept. of Geography, Univ., Durham, Royaume-Uni

THOMAS, R.E.

USDA-ARS National Sedimentation Lab., MS, Oxford, Etats-Unis

ASHWORTH, P.J.

School of Environment and Technology, Univ., Brighton, Royaume-Uni

BEST, J.L.

Dep. of Geography and Geology and Ven Te Chow Hydrosystems Lab., Univ. of Illinois, Urbana, Etats-Unis

LUNT, I.A.

StatOilHydro, Bergen, Norvege

SAMBROOK SMITH, G.H.

School of Geography, Earth and Environmental Sciences, Univ., Birmingham, Royaume-Uni

SIMPSON, C.J.

Fulcrum Graphic Communications Inc., Vancouver, Canada

Description :
The AA. couple archival photogrammetric techniques with image processing methods and test these for quantification of sand-bed braided river dynamics, illustrated for a 500 m wide, 3 km long reach of the South Saskatchewan River, Canada. Digital photogrammetry was used to quantify dry areas and water edge elevations. A methodology was then used to calibrate the spectral signature of inundated areas by combining established two media digital photogrammetric methods and image matching. This allowed determination of detailed depth maps for inundated areas and, when combined with dry area data, creation of complete digital elevation models. Error propagation methods were used to determine the erosion and deposition depths detectable from sequential digital elevation models.

Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2010, vol. 35, n°. 8, p. 971-985, nombre de pages : 15, Références bibliographiques : 56 ref.

Date :
2010

Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley

Langue :
Anglais