A debris flow triggered by 575 mm of rainfall over a 24-h period during Typhoon Soulik on July 13, 2013 buried debris-flow monitoring equipment in the gully 1 catchment at Houyenshan, Miaoli, Taiwan. The buried depth and covered area exceeded 2.5 m and 100 m2, respectively. Portable magnetometers were later deployed to detect a buried iron instrument case, and manual excavation was conducted from February 11 to April 6, 2015. The geomagnetic characteristics of the hot spots for the buried equipment exhibited both a high geomagnetic gradient and a null value on the magnetic anomaly contour map. The particle size distribution in the excavated pit indicated that the gravelly debris flows were both matrix-supported and muddy during the deposition process.
|Translated title of the contribution||Applying Portable Magnetometers to Detect Buried Instruments After a Debris Flow Event|
|Original language||Chinese (Traditional)|
|Number of pages||7|
|Journal||Journal of Chinese Soil and Water Conservation|
|State||Published - Dec 2020|