III Dynamic landslide inventory Dr. Sigrid Roessner - GFZ Potsdam - - PowerPoint PPT Presentation

▶
iii dynamic landslide inventory
SMART_READER_LITE
LIVE PREVIEW

III Dynamic landslide inventory Dr. Sigrid Roessner - GFZ Potsdam - - PowerPoint PPT Presentation

Nov 22, 2023 100 likes •388 views

III Dynamic landslide inventory Dr. Sigrid Roessner - GFZ Potsdam ISNET/ISA Workshop - Landslide inventories I Landslide inventories for hazard and risk analysis Landslide inventory Predisposing factors - Lithology Hazard

slide-1
SLIDE 1
  • Dr. Sigrid Roessner - GFZ Potsdam ISNET/ISA Workshop - Landslide inventories I

III Dynamic landslide inventory

slide-2
SLIDE 2
  • Dr. Sigrid Roessner - GFZ Potsdam ISNET/ISA Workshop - Landslide inventories I

Landslide inventories for hazard and risk analysis

Landslide inventory Hazard assessment Triggering factors Predisposing factors Risk elements Risk assessment

  • Precipitation/ seasonal

snowmelt and related infiltration

  • Seismic activity/

earthquakes

  • Lithology
  • Structural and

neotectonic setting

  • Relief
  • Human interference
  • Infrastructure
  • Census data

Magnitude probability Temporal probability Spatial probability after Guzzetti et al. 2005

slide-3
SLIDE 3
  • Dr. Sigrid Roessner - GFZ Potsdam ISNET/ISA Workshop - Landslide inventories I

Landslide Inventories

  • Prerequisite for a landslide susceptibility and hazard assessment
  • Types of inventories (see Guzzetti et al. 2012):

– Archive inventory: information obtained from literature – Geomorphological inventory:

  • Historical inventory
  • Event inventory
  • Seasonal inventory
  • Multi-temporal inventory
slide-4
SLIDE 4
  • Dr. Sigrid Roessner - GFZ Potsdam ISNET/ISA Workshop - Landslide inventories I

Temporal development of landslide prone slope

GoogleEarth (SPOT 5) image of 2002 Field photo of 2012 ASTER image of 2002 ASTER image of 2003 A B C A B A C B A B

slide-5
SLIDE 5
  • Dr. Sigrid Roessner - GFZ Potsdam ISNET/ISA Workshop - Landslide inventories I

Considerations for landslide inventories

What should be mapped?

  • Single landslide events vs. landslide-prone slopes
  • Types of landslides / mass movement
  • Landslide masses / scarps / area subjected to landsliding
  • Phases of reactivation

Conclusions:

  • Large variety of parameters / attributes
  • Choice of method depends on data availability and goal of inventory
  • Need for dynamic inventories with possibilities of regular updates
slide-6
SLIDE 6
  • Dr. Sigrid Roessner - GFZ Potsdam ISNET/ISA Workshop - Landslide inventories I

Establishment of landslide inventory at regional scale

  • ⇨ Challenge 1:

large study area (≈ 100 × 100 km²) Landslides reported in 2005 – 2010 by Kyrgyz Ministry of Emergency Situations Areas of known landslide activity (data of Ministry of Emergency Situations) Study area

  • ⇨ Challenge 2:

incompleteness of landslide information

slide-7
SLIDE 7
  • Dr. Sigrid Roessner - GFZ Potsdam ISNET/ISA Workshop - Landslide inventories I

Data Sources for Landslide Inventory

Dynamic landslide inventory Data of Kyrgyz authorities ≈1970s - 2011 Field campaigns 1998 - 2012 Visual interpretation

  • f remote sensing data

selected data sets 1986 – 2002 Automated analysis

  • f remote sensing data

time series ≈1990 – 2012 Field investigations Satellite remote sensing

  • ⇨ Challenge 3: heterogeneity of data sources
slide-8
SLIDE 8
  • Dr. Sigrid Roessner - GFZ Potsdam ISNET/ISA Workshop - Landslide inventories I

Report by Ibatulin (1998): snap-shot observations of ca. 1994

Kyrgyz Sources - Reports

Report by Ibatulin (2011): selected landslides observed in 1980s – ca. 2004

slide-9
SLIDE 9
  • Dr. Sigrid Roessner - GFZ Potsdam ISNET/ISA Workshop - Landslide inventories I

Report by Ibatulin et al. (1998): snap-shot observations of ca. 1994 Landslides in Report by Ibatulin et al. (1998) Landslides identified during field work (2012)

Kyrgyz Sources – Report 1998

slide-10
SLIDE 10
  • Dr. Sigrid Roessner - GFZ Potsdam ISNET/ISA Workshop - Landslide inventories I

Evaluation report 1998

Report by Ibatulin (1998): snap-shot observations of ca. 1994 + Large number of landslides and attributes + Locations of landslides shown on maps + Historical information not

  • btainable otherwise

+ Cost + Some of the documented landslides are difficult to access nowadays

  • No information about the dates of

landslide activity

  • Only documents landslides in

inhabited areas

  • Paper maps very imprecise due to

small scale; the spatial extent of landslides cannot be extracted from the maps

slide-11
SLIDE 11
  • Dr. Sigrid Roessner - GFZ Potsdam ISNET/ISA Workshop - Landslide inventories I

Kyrgyz Sources – Report 2011

Report by Ibatulin (2011): selected landslides observed in 1980s – ca. 2004

“…2004 landslide on the left bank of the river Budalyk on the northern edge of the village Kainama…”

A B C D E F A, B, C, D, E or F ?

slide-12
SLIDE 12
  • Dr. Sigrid Roessner - GFZ Potsdam ISNET/ISA Workshop - Landslide inventories I

Evaluation report 2011

Report by Ibatulin (2011): selected landslides observed in 1980s – ca. 2004 + Data on dates of selected landslides in 1980-2004 + Historical information not

  • btainable otherwise

+ Cost + Expert knowledge and information about detailed investigation of some landslides

  • Data limited to a particular time

period

  • Only presents large landslides,

landslides in inhabited areas and areas visited by a particular researcher

  • Verbal descriptions -> determining

spatial extent problematic

slide-13
SLIDE 13
  • Dr. Sigrid Roessner - GFZ Potsdam ISNET/ISA Workshop - Landslide inventories I

Kyrgyz Sources – Data Ministry of Emergency

Data of the Ministry of Emergency Situations (MChS): 2002 - 2010 Subset of a landslide report of 2005

slide-14
SLIDE 14
  • Dr. Sigrid Roessner - GFZ Potsdam ISNET/ISA Workshop - Landslide inventories I

Evaluation data Ministry of Emergency

Data of the Ministry of Emergency Situations (MChS): 2002 - 2010 + Locations of landslides with precise spatial reference + The dates of landslides are documented with a lag

  • f several months; sometimes

the precise date is known

  • Spatial information in form of

points

  • Only a small number of large

landslides in inhabited areas is documented

slide-15
SLIDE 15
  • Dr. Sigrid Roessner - GFZ Potsdam ISNET/ISA Workshop - Landslide inventories I

Comparison of Kyrgyz sources – area Budalyk

Landslides reported by Ministry of Emergency Situations of Kyrgyzstan between 2005 and 2010 Areas of known landslide activity Budalyk valley

slide-16
SLIDE 16
  • Dr. Sigrid Roessner - GFZ Potsdam ISNET/ISA Workshop - Landslide inventories I

Comparison of Kyrgyz sources – results Budalyk

  • 1) Verbal data: report by Ibatulin (2011)

describes selected landslide failures in 1980's - 2004

  • 2) Tabular data with point coordinates:

selective field investigations by Ministry of Emergency Situations in 2002 - 2011

F D E C B A

“… 2004 landslide

  • n the left bank
  • f the Budalyk

river on the northern edge of the Kainam a village… ” A, B, C, D, E or F?

Landslides mapped based on report by Ibatulin (2011) Landslides reported by Ministry of Emergency Situations in 2002-2011 Landslides mapped in field in 2012

RapidEye image 2011

slide-17
SLIDE 17
  • Dr. Sigrid Roessner - GFZ Potsdam ISNET/ISA Workshop - Landslide inventories I

Data Sources for Landslide Inventory

Dynamic landslide inventory Data of Kyrgyz authorities ≈1970s - 2011 GFZ field campaigns 1998 - 2012 Visual interpretation

  • f remote sensing data

selected data sets 1986 – 2002 Automated analysis

  • f remote sensing data

time series ≈1990 – 2012 Field investigations Satellite remote sensing

  • ⇨ Challenge 3: heterogeneity of data sources
slide-18
SLIDE 18
  • Dr. Sigrid Roessner - GFZ Potsdam ISNET/ISA Workshop - Landslide inventories I

GFZ field campaigns - results

GIS with GPS way points and field photos since 1998 1 2 km LANDSAT_TM R-G-B (6-5-1), 2000

2008 2002 1998 1999 2000

slide-19
SLIDE 19
  • Dr. Sigrid Roessner - GFZ Potsdam ISNET/ISA Workshop - Landslide inventories I

GFZ field campaigns - results

GIS with GPS way points and field photos since 1998

1999 LANDSAT_TM R-G-B (6-5-1), 2000

2008 2002 1998 1999 2000

slide-20
SLIDE 20
  • Dr. Sigrid Roessner - GFZ Potsdam ISNET/ISA Workshop - Landslide inventories I

GFZ field campaigns - results

GIS with GPS way points and field photos since 1998

2008 LANDSAT_TM R-G-B (6-5-1), 2000

2008 2002 1998 1999 2000

slide-21
SLIDE 21
  • Dr. Sigrid Roessner - GFZ Potsdam ISNET/ISA Workshop - Landslide inventories I

GFZ field campaigns - results Budalyk

Landslides mapped in field in 2012 Landslides mapped using Ibatulin (2011)

  • 18.06.200

4

  • 26.05.200

8

  • 12.09.201

2

Way points: 2012 2008 2002 2011 2004 1999

RapidEye image 2011

  • Field campaigns by GFZ Potsdam in cooperation with Ministry of Emergency Situations in

1998 – 2012: GPS way points and field photos

slide-22
SLIDE 22
  • Dr. Sigrid Roessner - GFZ Potsdam ISNET/ISA Workshop - Landslide inventories I

Evaluation GFZ field campaigns

Field campaigns in 1998, 1999, 2000, 2002, 2004, 2008 - 2012 + Influence on the selection of

  • bserved landslides

+ Additional information due to the participation of Kyrgyz colleagues + Additional information from local residents + Verification of results

  • btained with other methods

+ Possibility to collect samples and perform measurements

  • Only a snap-shot, normally no

information about the dates of landslide activity

  • A small number of landslides in

inhabited areas

  • Cost
  • Difficult to determine the extent of

a landslide due to limited visibility

slide-23
SLIDE 23
  • Dr. Sigrid Roessner - GFZ Potsdam ISNET/ISA Workshop - Landslide inventories I

Data Sources for Landslide Inventory

Dynamic landslide inventory Data of Kyrgyz authorities ≈1970s - 2011 GFZ field campaigns 1998 - 2012 Visual interpretation

  • f remote sensing data

selected data sets 1986 – 2002 Automated analysis

  • f remote sensing data

time series ≈1990 – 2012 Field investigations Satellite remote sensing

  • ⇨ Challenge 3: heterogeneity of data sources
slide-24
SLIDE 24
  • Dr. Sigrid Roessner - GFZ Potsdam ISNET/ISA Workshop - Landslide inventories I

Visual Interpretation of Remote Sensing Data

Main scarps Displaced material Young tectonic faults Landslides mapped in field in 2012

Monotemporal data

RapidEye image 2011

slide-25
SLIDE 25
  • Dr. Sigrid Roessner - GFZ Potsdam ISNET/ISA Workshop - Landslide inventories I

Visual Interpretation of Remote Sensing Data

before 1998 1998 – 2001 2002 – 2004 Main scarps Displaced material Young tectonic faults Landslides mapped in field in 2012

Multitemporal data Monotemporal data

RapidEye image 2011 RapidEye image 2011

Landslide failures:

slide-26
SLIDE 26
  • Dr. Sigrid Roessner - GFZ Potsdam ISNET/ISA Workshop - Landslide inventories I

Evaluation of visual interpretation

Images from different sensors for 1986 - 2010 + High spatial precision + Clear understanding of obtained results + Includes context knowledge of expert + Delineation of complex landslides

  • Only possible for a limited spatial

and temporal extent

  • Dependent on the quality of remote

sensing data

  • Location of polygons may vary

slightly due to manual digitalization

  • Temporal resolution depends on

data availability

  • Often summary inventories – before

date of data acquisition

slide-27
SLIDE 27
  • Dr. Sigrid Roessner - GFZ Potsdam ISNET/ISA Workshop - Landslide inventories I

Conclusions

  • GIS-based integration of data from different sources necessary in regions with

heterogeneous data availability

  • Multitemporal satellite remote sensing allows:

– Creation of a common spatial reference for existing landslide data – Improved spatial and temporal characterization of landslides – Higher level of inventory completeness – Establishment of a continuous monitoring system of landslide activity

  • Analysis of large areas requires development of automated methods for

landslide identification