Real-time measurement and preliminary analysis of debris-flow impact force at Jiangjia Ravine, China

Auteur(s) et Affiliation(s)



Description :
Impact forces associated with major debris flows (Jiangjia Ravine, China, August 25, 2004) were recorded in real time by a system consisting of 3 strain sensors installed at different flow depths. An approach including low-pass filtering and moving average methods were used to preprocess the recorded signals. It was found that the peak grain impacts at different depths were non-synchronous within the debris flows. The impact loadings were far greater than, and not proportional to the fluid pressures. Analysis of the impact force of 38 debris flow surges gives an empirical value for the ratio of the hydrodynamic pressure to the momentum flow density, i.e. the product of debris-flow density and mean velocity square, which provides a very valuable basis for understanding debris flow dynamics and designing debris flow management systems.


Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2011, vol. 36, n°. 9, p. 1268-1278, nombre de pages : 11, Références bibliographiques : 33 ref.

Date :
2011

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