Landslide hazard zonation of Nilambur taluk using remote sensing
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Date
2016
Journal Title
Journal ISSN
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Publisher
Academy of Climate Change Education and Research Vellanikkara
Abstract
Present study aims at the preparation of a landslide hazard zonation map for
Nilambur Thaluk of Malappuram district, Kerala and to suggest mitigation
measures for controlling landslides. Landslide Hazard zonation is achieved using
spatial multi criteria evaluation (SMCE) module of ILWIS 3.31 RS-GIS software.
SMCE is based on the Analytical Hierarchical Process (AHP) developed by Saaty
(1980). Different parameters contributing to landslides were identified. Thematic
maps of various parameters like slope, aspect, soil, geology, landuse, rainfall and
elevation were prepared. These thematic layers were standardised and overlaid with
appropriate weights to generate landslide hazard zones of Nilambur Taluk. The
study area was divided into three zones namely low, medium and high hazard zones.
Landslide Hazard Zonation (LHZ) map of the Nilambur Thaluk was
prepared using the SMCE module of ILWIS software. According to the LHZ map,
12.4 km2 (0.94%) is located in the low hazard zone, 1080.8 km2 (81.68) % in the
medium hazard zone and 230 km2 (17.38%) in high hazard zone. Study found that
most of the areas fall under medium hazard zone followed by high hazard zone.
Analysis of the LHZ map, revealed that the Western regions of the study area
including Akampadam, Kalikavu and Karuvarakundu and areas along the
Kozhikode - Nilambur - Gudallur Highway are highly unstable. The probability of
occurrence of debris flow in this region is high. These regions have steeply sloping
topography and with heavy rainfall during the monsoon season it can cause heavy
landmass movement. Some of the tourist spots are concentrated around
Akampadam and Karuvarakundu regions like Adyanpara waterfalls and
Keralakund waterfalls. Mampad rubber estate, Ariyani rubber estate and areas along
Kanjirappuza fall under high hazard zone. Some of the reserved forest area is also
coming under high hazard zone. Landslide mitigation measures like slope
stabilization, drainage, control of plantations, afforestation, stabilization of roads
and avoiding constructional activity in high hazard area have been suggested. The
LHZ map was validated by overlaying with previous landslide points.
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