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 assessment after Guzzetti et al. 2005 - Structural and neotectonic setting - Relief Spatial - Human interference probability Magnitude Temporal Triggering factors probability probability -Precipitation/ seasonal Risk elements snowmelt and related infiltration - Infrastructure - Seismic activity/ - Census data Risk assessment earthquakes 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 Dr. Sigrid Roessner - GFZ Potsdam ISNET/ISA Workshop - Landslide inventories I
Temporal development of landslide prone slope A B B A C GoogleEarth (SPOT 5) image of 2002 Field photo of 2012 A A B C B ASTER image of 2002 ASTER image of 2003 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 Dr. Sigrid Roessner - GFZ Potsdam ISNET/ISA Workshop - Landslide inventories I
Establishment of landslide inventory at regional scale 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 1: large study area ( ≈ 100 × 100 km²) • ⇨ Challenge 2: incompleteness of landslide information Dr. Sigrid Roessner - GFZ Potsdam ISNET/ISA Workshop - Landslide inventories I
Data Sources for Landslide Inventory Field investigations Data of Kyrgyz authorities Field campaigns ≈ 1970s - 2011 1998 - 2012 Dynamic landslide inventory Visual interpretation Automated analysis of remote sensing data of remote sensing data time series ≈ 1990 – 2012 selected data sets 1986 – 2002 Satellite remote sensing • ⇨ Challenge 3: heterogeneity of data sources Dr. Sigrid Roessner - GFZ Potsdam ISNET/ISA Workshop - Landslide inventories I
Kyrgyz Sources - Reports Report by Ibatulin (1998): snap-shot observations of ca. 1994 Report by Ibatulin (2011): selected landslides observed in 1980s – ca. 2004 Dr. Sigrid Roessner - GFZ Potsdam ISNET/ISA Workshop - Landslide inventories I
Kyrgyz Sources – Report 1998 Report by Ibatulin et al. (1998): snap-shot observations of ca. 1994 Landslides identified during field work (2012) Landslides in Report by Ibatulin et al. (1998) 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 - No information about the dates of landslides and attributes landslide activity + Locations of landslides - Only documents landslides in shown on maps inhabited areas + Historical information not - Paper maps very imprecise due to obtainable otherwise small scale; the spatial extent of + Cost landslides cannot be extracted from + Some of the documented the maps landslides are difficult to access nowadays 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 F northern edge of the B village Kainama …” C D A A , B , C , D , E or F ? E 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 - Data limited to a particular time landslides in 1980-2004 period + Historical information not - Only presents large landslides, obtainable otherwise landslides in inhabited areas and + Cost areas visited by a particular + Expert knowledge and researcher information about detailed - Verbal descriptions -> determining investigation of some landslides spatial extent problematic 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 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 - Spatial information in form of with precise spatial points reference - Only a small number of large + The dates of landslides landslides in inhabited areas is are documented with a lag documented of several months; sometimes the precise date is known 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 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 “… 2004 landslide on the left bank F of the Budalyk D river on the B C A northern edge of E the Kainam a village… ” A , B , C , D , E or F ? • 2) Tabular data with point coordinates: selective field investigations by Ministry of RapidEye image 2011 Emergency Situations in 2002 - 2011 Landslides mapped based on report by Ibatulin (2011) Landslides reported by Ministry of Emergency Situations in 2002-2011 Landslides mapped in field in 2012 Dr. Sigrid Roessner - GFZ Potsdam ISNET/ISA Workshop - Landslide inventories I
Data Sources for Landslide Inventory Field investigations Data of Kyrgyz authorities GFZ field campaigns ≈ 1970s - 2011 1998 - 2012 Dynamic landslide inventory Visual interpretation Automated analysis of remote sensing data of remote sensing data time series ≈ 1990 – 2012 selected data sets 1986 – 2002 Satellite remote sensing • ⇨ Challenge 3: heterogeneity of data sources 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 2002 1998 2008 1999 2000 0 1 2 km LANDSAT_TM R-G-B (6-5-1), 2000 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 2002 1998 1999 2008 1999 2000 LANDSAT_TM R-G-B (6-5-1), 2000 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 2002 1998 2008 2008 1999 2000 LANDSAT_TM R-G-B (6-5-1), 2000 Dr. Sigrid Roessner - GFZ Potsdam ISNET/ISA Workshop - Landslide inventories I
GFZ field campaigns - results Budalyk • Field campaigns by GFZ Potsdam in cooperation with Ministry of Emergency Situations in 1998 – 2012: GPS way points and field photos • 18.06.200 4 • 26.05.200 8 RapidEye image 2011 Landslides mapped in field in 2012 • 12.09.201 2 Landslides mapped using Ibatulin (2011) Way points: 2012 2008 2002 2011 2004 1999 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 - Only a snap-shot, normally no observed landslides information about the dates of + Additional information landslide activity due to the participation of - A small number of landslides in Kyrgyz colleagues inhabited areas + Additional information from - Cost local residents - Difficult to determine the extent of + Verification of results a landslide due to limited visibility obtained with other methods + Possibility to collect samples and perform measurements Dr. Sigrid Roessner - GFZ Potsdam ISNET/ISA Workshop - Landslide inventories I
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