Evaluating hillslope stability in tropical karst
David Gillieson - (27/1,1998)
Residential development in the tower karst of the Kinta valley, Malaya is proceeding at a rapid pace, and many developments have been subject to damage and loss of life from landslides and rockfalls. Study was conducted at Gunung Tempurung- Gajah, a 600-metre high limestone tower. The evaluation of hillslope stability was made by geomorphological mapping including the parameters: type of slope, activity of landslides and rock stability. Over geological timescales, periodic landslides and rockfalls are a normal and expectable part of the geomorphological processes in the tower karst of the Kinta valley. The expected frequency of landslides today is difficult to determine but recourse can be made to data on the frequency of high-intensity rainfall, and examination of revegetation on landslip debris. From these data, it seems probable that minor landslides can be triggered every 2-3 years in the area, with major phases of landslide activity occurring every 20 years.