Infrasound Measurements Of Debris Flow
Author(s)
J. Hübl, S. C. Zhang & A. Kogelnig
Abstract
Processes such as wind, avalanches, traffic and debris flow are sources of subaudible
sounds in the low frequency infrasonic spectrum. These signals have the
ability to propagate kilometres from the debris flow source and provide a basis
for developing wide area automated monitoring systems that can operate in
locations unaffected by the process activity. This study focuses on naturally
occurring infrasound produced by a 3 days debris flow event in July 2007, in the
Jiangjia Gully, Yunnan, China. The debris flows had a big variety in terms of the
amount of discharge and furthermore they differ from very fluid surges up to
more solid surges with a density of 2000kg/m³. The data was monitored with two
different microphones, a custom made Chinese Sensor and a standard infrasound
measuring microphone from a German Company. Contemporary video recording
and photographing took place for visual validation of the acoustic signals. The
aim is to specify the debris flow signal out of environmental interferences
through the use of digital filtering and frequency analysis.
Keywords: infrasound monitoring, debris flow, frequency spectrum, field study.
1 Introduction
Rapid mass movements like debris flows, debris floods and intensive bedload
transport are periodic or episodic phenomena in alpine regions. Due to the fast
socio-economic development of mountain regions, these processes which are at
the intersection between the natural environment and the environment formed
and controlled by human activities increasingly become a hazard for people and
Keywords
infrasound monitoring, debris flow, frequency spectrum, field study.
Related Book
Other papers in this volume
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