SLOPE HAZARD AND RISK MAPPING: A … · planning towards a sustainable land management. ... Rawang-Batang Kali (150 km2) ... inventory using LiDAR technology for regional and national

MINERALS AND GEOSCIENCE DEPARTMENT MALAYSIA

MINISTRY OF NATURAL RESOURCES AND ENVIRONMENT MALAYSIA

International Symposium on Multi-Hazard and Risk 2015

23-24 March 2015, UTM Kuala Lumpur

By:

Dato’ Zakaria Mohamad

Project Manager PBRC

Very high resolution DTM

derived from LiDAR LiDAR Ortho image

SLOPE HAZARD AND RISK MAPPING:

A TECHNOLOGICAL PERSPECTIVE

Slope Hazard and Risk Mapping in the Tropics: Why it is a challenging task?

• In the monsoon-dominated regions, landslides occur in areas characterized

by steep hillslopes, high rainfall intensities, seasonally dry periods, unstable

slopes and also under forests.

• Landslide inventory maps are fundamental for assessing landslide

susceptibility, hazard, and risk.

• The compilation of landslide inventory maps is a tedious procedure due to

the fact that each individual landslide has to be mapped and described

together with their characteristics according to standard practices.

• Conventional landslide mapping

techniques (aerial photos have limitations in a forested

mountainous environment

>> multi-sensor LIDAR is a promising tool for

solving an old geological problem !!

RISK ASSESSMENT:

CHALLENGES AND ISSUES

Gu

nu

ng

Pa

ss

, Pe

rak

Ma

lays

ia

Batu

Cave

s, S

ela

ng

or, M

ala

ys

ia

Current scenarios of

landslides in

Malaysia

Photos of landslides

and their impact

towards human lives

and infrastructure, e.g.

road and building are

prevailed.

Hulu Langat 2010 Bukit Antarabangsa

2008

Bukit Antarabangsa

2008

Highland Tower 1993

Sivan Temple 2011

Lebuhraya Mahameru 2014

Bukit Antarabangsa 1999

PBRC PROJECT OBJECTIVES

• To produce slope hazard and risk information in the selected areas for the local authorities in Malaysia for a better slope management.

• To provide conceptual proposal and cost estimation for mitigating and strengthening high risky slopes.

• To assist government agencies and local authorities in land-use planning towards a sustainable land management.

• To develop geospatial infrastructure for national geological terrain and slope information.

Hazard and risk mapping

Landslide prone area

Cameron Highlands (400 km2)

Ipoh (300 km2)

Rawang-Batang Kali (150 km2)

Cheras Selatan-Bangi (200 km2)

Gombak-Kajang-Selayang (300 km2)

Bukit Frasers (100 km2)

Kapit (100 km2)

Landslide Inventory Map For Peninsular Malaysia/East Malaysia

(National Slope Master Plan)

Kota Kinabalu (175 km2)

Kundasang (50 km2)

PBRC PROJECT AREA IN

SELANGOR (650 km2)

PBRC PROJECT AREA IN

CAMERON HIGHLANDS

(275 km2)

PBRC PROJECT AREA IN

IPOH (200 km2)

1

2

43

5 6

7

8

10

9

Conceptual Framework – Landslide Hazard and Risk Mapping

1. Airborne LIDAR; 2. Terrestrial LIDAR, 3. GPS Survey, 4. Mobile GIS Field Mapping, 5. Data Processing, 6. LIDAR-Landslide Processing,

7. Landslide Inventory Mapping, 8. Landslide susceptibility Analysis, 9. Landslide Hazard Assessment, 10. Landslide Risk Assessment

Methodological Flow – Quantitative Landslide Risk Assessment

LiDAR Data

Acquisition in Klang

Valley (Selangor),

Cameron Highlands

and Ipoh

Classified Point Clouds as Ground over

Terrain Shaded Relief of very high resolution DTM

derived from LiDAR

Sample: Klang Valley

Classified Point Clouds as Ground over

Terrain Shaded Relief of very high esolution DTM

derived from LiDAR Ortho image

Sample: Klang Valley

Orthophoto

Digital Terrain Model

Bukit

Antarabangsa

Source: RS GIS

LiDAR Point Cloud (Cross section),

Bukit Antarabangsa

Source: RS GIS

LIMESTONE CLIFF MAPPING USING TERRESTRIAL LASER SCANNING, BATU

CAVES, SELANGOR MALAYSIA

Stage 1 – Planning & Pre-survey Stage 2 – Data Collection Stage 3 - Data Processing and Analysis

Colorized point cloud

derived from TLS LIDAR

Long range TLS

scanner

Rock slope characteristics revealed by hyperspatial TLS data (Batu Caves, Selangor). A) Usual geometric terrain of rock slope. B) Peculiar characteristic of natural rocky limestone.

C) An entire of cross sections coupled with rock cliff boundary and contour line used for geological and

geotechnical assessment.

TLS Ortho Image from the Permatang Kuarza Selangor

(Klang Gate Quartz Ridge), Klang Valley

Source: GPS Land

TLS Ortho Image at Kg. Dumpirin, Kundasang, Sabah

Source: GPS Land

1. Methodological working framework for slope hazard and risk mapping

has been developed for PBRC project

2. Multi sensor (airborne and terrestrial) system is a critical tool for providing

an accurate geospatial data input (very high resolution DTM and DSM) for

landslide hazard and risk assessment in the tropics.

3. PBRC creates a platform for developing a comprehensive landslide

inventory using LiDAR technology for regional and national purposes.

4. PBRC promotes multi-disciplinary and knowledge-based approach for

complex landslide assessment and disaster risk reduction initiative in

Malaysia.

CONCLUSION

Thank you