Upload
keoley
View
215
Download
0
Embed Size (px)
Citation preview
7/30/2019 03 Qualitative Landslide Risk Maps Examples
1/11
1
1
Lecture Overview
Example of qualitative risk mapping from
Rheinhessen, Germany
Example of quantitative risk mapping from
Bildudalur, Island
Example of quantitative risk mapping from Cairns,
Australia
Preliminary results from a local and regional
landslide risk approach, Swabian Alb, Germany
2
Example of Rheinhessen, Germany
Regional landslide risk analysis
Qualitative approach
Key research issues:
To develop a concept for regional landslide risk
analysis adjusted to German conditions
To test this concept
To give a first approximation of landslide risk
7/30/2019 03 Qualitative Landslide Risk Maps Examples
2/11
2
3
Scale of the study
No
No
Yes
Process-based
Analysis
Quantitative methodsQualitative methods
NoNoYesYes> 1:100,000
NoYesYesYes1:25,000
1:50,000
YesNoYesYes< 1:10,000
Neural network
analysis
Statistical
Analysis
Heuristic
AnalysisInventar
Scale
adopted from Soeters & van Westen (1996) and Aleotti & Chowdhury (1999)
4
Methodology
7/30/2019 03 Qualitative Landslide Risk Maps Examples
3/11
3
5
Study area
6
Landslide near Ockenheim, Rheinhessen
7/30/2019 03 Qualitative Landslide Risk Maps Examples
4/11
4
7
Landslide susceptibility map of Rheinhessen
Glade (2001), based on Jger (1997)
DTM 40m DTM 20m
8
Elements at risk
13-15Road85-128Motorway
0.5-0.7Agric.205Spec.
10Wine205-255Ind.
0.3Bush/past.255-410Mixed
2Forest255Resid.
/m2ER/m2ER
7/30/2019 03 Qualitative Landslide Risk Maps Examples
5/11
5
9
Damage potential
10Very high
2High
46Moderate
42Low
PercentageDamage
Potential
10
Weightning Options Risk Matrix
Very high
High
Low
Very high
Very highHighModerateHigh
HighModerateModerateModerate
LowLowLowLow
HighModerateLowDamage
Hazard
7/30/2019 03 Qualitative Landslide Risk Maps Examples
6/11
6
11
Landslide risk
0.2Very high
2High
8Moderate
90Low
PercentageLandslide
Risk
12
Discussion of Rheinhessen study
Concept has the potential to be used
Based on general information, thus applicable to
other regions
Cautious establishment of Risk Matrix
Identification of hot spots
Support for local and regional authorities as a
planning tool for hazard mitigation
7/30/2019 03 Qualitative Landslide Risk Maps Examples
7/11
7
13
Perspectives
Verification of spatial landslide hazard analysis
Vulnerability curves for each element at risk
Types of vulnerability (e.g. social, structural)
Comparing different scales (spatial & temporal)
Risk perception of various actors
Assessment of user demands
Multi-natural hazards and risk
14
Examples from Bldudalur, NW-Iceland
Regional risk analysis
Quantitative approach
Multi-Hazard analysis
Debris flows
Rock falls
Snow avalanche
7/30/2019 03 Qualitative Landslide Risk Maps Examples
8/11
8
15
Methodology
Eipe = per person (individual risk)
Epe = number of people in one object (object risk)
Ep = monetary value of object (economic risk)
16Glade (2002)
7/30/2019 03 Qualitative Landslide Risk Maps Examples
9/11
9
17
Examples from Bldudalur, NW-Iceland
18
Examples from Bldudalur, NW-Iceland
7/30/2019 03 Qualitative Landslide Risk Maps Examples
10/11
10
19
Individual risk to life, object risk to life and economic
riskUnit
Risk type min max very low low medium high
individual risk to life
7/30/2019 03 Qualitative Landslide Risk Maps Examples
11/11
11
21
Object risk to life
22
Economic risk