OBSERVATIONS AND ANALYSIS ON RAINFALL INDUCED SLOPE FAILURES FOR JELAPANG AND GUA TEMPURUNG AREA USING G.I.S.
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1 PRESENTATION TO THE BOARD OF DIRECTORS PLUS BERHAD OBSERVATIONS AND ANALYSIS ON RAINFALL INDUCED SLOPE FAILURES FOR JELAPANG AND GUA TEMPURUNG AREA USING G.I.S. MAY 2015
2 TABLE OF CONTENTS Introduction: PLUS Study Area: Jelapang & Gua Tempurung GIS Analysis: the trends Real Time Monitoring System - Raingauge Case Study and Observation 2
3 TABLE OF CONTENTS Objectives of Research: Understand the trend of slope failures Understand the catchment properties Rainfall threshold of slope failures for the areas 3
4 INTRODUCTION PLUS
5 PLUS 5
6 PLUS Backbone of Malaysian road transport system: Connects major industrial, commercial & transportation centers Links major seaports and airports States serviced by the NSE make up 81% of population and 89% of GDP in Peninsular Malaysia Length PLUS North-South Expressway 846 km ELITE NSE Central Link 63 km LINKEDUA BKE PB Malaysia-Singapore Second Crossing Butterworth-Kulim Expresssway Penang Bridge 47 km 17 km 13.5km km 6
7 PLUS - Assets Maintenance Maintenance Management Management Slope > 5,000 slopes 4291 lane km Drainage > 4,000 culverts 483 bridges 2 tunnels (861m & 832m) 7
8 STUDY AREAS: JELAPANG & GUA TEMPURUNG
9 WHY? Back-bone of PLUS Small maintenance corridor Impact of failure from outside Debris flow (2004) 9
10 JELAPANG AREA MAP LAYOUT 10
11 JELAPANG AREA AERIAL PHOTOGRAPH Mountainous area Granitic Formation (part of Kledang Range) High cut rock slopes (shallow regolith) 11
12 GUA TEMPURUNG AREA MAP LAYOUT 12
13 GUA TEMPURUNG AREA AERIAL PHOTOGRAPH Boundary between Granitic Formation (north-east) and lime stone formation (south-west) High cut soil slopes (deep regolith) 13
14 GIS ANALYSIS - The Trends
15 GIS ANALYSIS Data obtained IFSAR data (Inter-ferometric Synthetic Aperture Radar) Worldview 2 / Quickbird LIDAR # Slope failure records 15
16 GIS ANALYSIS Methodology DSM and DTM GIS Analysis Aspects Slope / Inclination Curvature Hydrology Elevation (against records of slope failures) 16
17 GIS ANALYSIS GUA TEMPURUNG Slope angle / surface inclination Slope aspect 17
18 GIS ANALYSIS GUA TEMPURUNG Surface elevation Surface curvature 18
19 FREQUENCY RATIO 19
20 FREQUENCY RATIO Angle of repose (earth: ) 20
21 REAL TIME MONITORING SYSTEM (RTMS)
22 RTMS CONCEPTUAL LAYOUT Equipment Installed Server System (HQ) Slope monitoring RG stations (70) PM stations (12) Flood monitoring RG stations (3) PM stations (5) 22
23 RTMS USER INTERFACE Study area Gua Tempurung Overall map NSE User Interface Intranet Internet 23
24 RTMS RAIN GAUGE STATIONS FOR STUDY AREAS Typical site layout JELAPANG 10 nos GUA TEMPURUNG 5 nos 24
25 CASE STUDY & OBSERVATIONS
26 CASE STUDY GUA TEMPURUNG AREA Slope failure at Gua Tempurung area. Seven (7) new failures scars beyond ROW observed during aerial inspection dated 18 June 2012 The slope failures occurred at steep natural slope (estimated gradient more than 35 ) Shallow surface failures (estimated between 2 to 3 m deep and wide between 10m to 20m failures occurs within the root zone of the hill-side slopes) The residual soil for the upper region of the natural hill slopes is shallow, between 1m to 3m depth (observed via helicopter visual survey) The exposed soil ranges from yellow to reddish soil (normal for granitic residual soil) 26
27 CASE STUDY GUA TEMPURUNG AREA (MULTIPLE SLOPE FAILURES) Haversine formula: a = sin²(δφ/2) + cos(φ1).cos(φ2).sin²(δλ/2) c = 2.atan2( a, (1 a)) d = R.c Where φ is latitude, λ is longitude, R is earth s radius (mean radius = 6,371km) 27
28 CASE STUDY GUA TEMPURUNG AREA (RAINFALL ANALYSIS) Intensity / volume / duration 28
29 CASE STUDY GUA TEMPURUNG AREA (SURFACE ANALYSIS) DTM and mapping Surface analysis Hydrology Analysis Flow direction Flow accumulation Stream order 29
30 CASE STUDY GUA TEMPURUNG AREA (CATCHMENTS - HYDROGEOLOGY) Basin: Catchment Funnel shape Small outlet Impact point 30
31 CASE STUDY CONCLUSION Slope failures: Characteristics observed Slopes with inclination between 31 to 40 Slope aspects facing either north or south. Slopes with concave surfaces Slopes located near or at stream flow alignment Rainfall Threshold Based on 2 case study Threshold recommended = 50.0 mm (For early warning) Potential point of Impact 31
32 CASE STUDY PREVENTIVE MEASURE? Preventive measures : Debris Flow Net Controlled channel Rainfall monitoring (RTMS & EWS) Aerial surveillence 32
33 THANK YOU
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