High-resolution analysis of debris flow-induced channel changes in a headwater stream, Ashio Mountains, Japan

Auteur(s) et Affiliation(s)



Description :
Changes in channel size and shape caused by a debris flow event along the length of a headwater stream (HWS) in the Ashio Mountains were captured with the aid of repeat high-definition surveys using terrestrial laser scanning (TLS) techniques. The HWS was classified into 3 distinct reaches below the debris flow initiation zone. Morphometric analyses from the TLS point cloud revealed that debris flow erosion produced a distinct nonlinear change in channel dimensions in the downstream direction within the HWS. Variations in channel substrate along the length of HWS contributed directly to this nonlinear response. TLS sampling methods show promise as one component of a multianalytical approach needed to continuously monitor and manage the dynamics of HWS.


Type de document :
Article de périodique

Source :
The Professional geographer, issn : 0033-0124, 2009, vol. 61, n°. 2, p. 231-249, nombre de pages : 19, Références bibliographiques : 2 p.

Date :
2009

Editeur :
Pays édition : Etats-Unis, Cambridge, MA, Blackwell