Effectiveness of Geoelectrical Resistivity Surveys for the Detection of a Debris Flow Causative Water Conducting Zone at KM 9, Gap-Fraser’s Hill Road (FT 148), Fraser’s Hill, Pahang, Malaysia
Table 1
(a) Chronology of landslides at km 9, Fraser’s Hill-Gap road (FT148). (b) Chronology of debris flows at km 90, Gap-Tranum road (FT 55).
(a)
Date
Description
(a) December 16, 2007
A landslide occurred at Kilometre 4-5, FT 148, New Gap road to Fraser's Hill and the road was declared unsafe for all vehicles
(b) January 12, 2009
The collapse of a new embankment occurred within the project site, causing some damage to equipment and machinery and affected work in progress (Figure 18: photograph taken on January 19 2008 and Figure 19: view final landslide before remediation)
(b)
Date
Description
(a) November 16, 2007
Blockage occurred due to rubble, mud, and rock slide material. Public Work Department (PWD) carried out cleaning work and the road was eventually opened
(b) February 27, 2008
Debris flow occurred again, resulting in the blockage due to mud, rock slides, and rock blocks. Road was closed to all traffic users from 03/03/2008 to 06/06/2008.
(c) March 6, 2008
Clearing work carried out using explosives
(d) March 7, 2008
Route was reopened to all traffic
(e) March 8, 2008
Debris flow occurred again and caused the flow of mud and boulders to cover the road. Cleaning work carried out and the road could be used by light vehicles
(f) March 15, 2008
Debris flow occurred with debris, boulders, and mud. Cleaning work carried out and road was opened to light vehicles only
(g) March 17, 2008
Debris flow occurred. Cleaning work carried out and road was opened to light vehicles only
(h) March 19, 2008
Debris flow occurred resulting in mud and rock slides. The road was closed. Cleaning could not be conducted due to weather conditions that were hazardous to workers at the site
(i) March 22, 2008
Bridge collapsed causing structural breaks of the steel plate beam buckle
(j) March 23, 2008
Debris flow and the cliff road failed and the road surface collapsed for over 60 m (Figure 3 shows this incident)
(k) June 26, 2008
Repairs completed and roads opened to vehicles
(l) July 3, 2008
The collapse of new gabion retaining wall, destroyed by rock slides
(m) July 8, 2008
New debris flow resulting in mudslide. Road was closed
(n) July 15, 2008
Cleaning works carried out. Road reopened to all vehicles
