RELATIONSHIP BETWEEN RAINFALL AND DEBRIS FLOW OCCURRENCE IN THE CROCKER RANGE OF SABAH, MALAYSIA.
Journal: Malaysian Journal of Geosciences (MJG)
Author: Edgar Jr. Joe, Felix Tongkul, Rodeano Roslee
This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited
Debris flow occurrence are quite common in mountainous areas such as those in the Crocker Range of Sabah, Malaysia especially during prolonged heavy rainfall. Despite of the recurrence of debris flows in the area, not much information is known about the effect of rainfall on their occurrences. Based on the rainfall intensity-duration of two selected case studies at Jalan Penampang-Tambunan KM38.80 and Jalan Tamparuli-Ranau KM83.90, the debris flow threshold for the Crocker Range cases are approximate to that proposed by Montgomery et al. (2000) given by the equation of I = 9.9D-0.52
which is generally low. This implies that low-intensity rainfall is sufficient to trigger debris flows due to high availability of loose material and weak geological condition.