Spatial variation of the Landslide hazard analysis with GIS

1. Advanced Geographic Information
System
GGY-451
S. Lathiscumar,
A/11/427,
Department of Geography,
Faculty of Arts,
University of Peradeniya.

2. Topic: The landslide hazard in Badulla district

3. 1. Introduction
2. Research objective
3. Methodology
4. Research area
5. Analysis and discussion
6. Causes of landslide in Badulla district
7. Recommendation to prevent the landslide
8. Conclusion
9. Reference
Content

4. 1. Introduction
 Landslide is a significant hazard in the mountain areas.
 Sudden movement of rock or soil mass are fairly common and are
generally termed as landslide.
 Kind of landslides are rock fall, debris flow, creep, landslide, cutting
failture, and etc.
 The central highlands of Sri Lanka often experience landslides during the
rainy seasons. e.g. Aranayakka, 2016.
 Landslide hazard affected districts are Matale, Kandy, Nuwara Eliya,
Badulla, Kegalle, Ratnapura, Kalutara, Galle, Matara and Hambantota.
 Badulla district mostly affect with landslide hazard in Sri Lanka.

5. 2. Research objective
The goal of this research is to obtain landslide risk area in Badulla district.
Therefore this research mention landslide affected GN divisions over the
last three decade. The research has the following specific objectives:
 To examine highly landslide risk areas in Badulla district.
 To identify kind of landslide affected areas in Badulla district.
 To study the relationship between landslide and seasonal rainfall.

6. 3. Methodology
This research hasn’t any data sample. Because study will mention each and
every part of the Badulla district.
 Data collection
This research is entirely based on secondary data available from the
Department of disaster management.
 Data analysis
I will use data analysis is Quantitative analysis. In this way this research mainly
with GIS soft ware. GIS spatial analysis techniques such as georeference and
drawing tool.
Data Collection
Secondary data Landslide
Department of Disaster
management

7. Sri Lanka
4. Research area
The Badulla District is located to the East
of the Central highlands.
The district position is 6 ° 59’05” N and
81 ° 03’23” E.
 Badulla district’s elevation is 600 - 1300
m.
Annual temperature is 22°C and annual
rainfall is 1524 – 1905 mm.
 Then according from 2010 census,
Badulla district population is 886 000.
There are 15 divisional secretariats.
The district has 567 Gramma Niladhari
Division (GND).

8. 5. Analysis and discussion
•The Badulla district has severe landslide in
three decades (1980 to 2010).
•This research identify 17 GNDs are landslide
hazard areas in district.
Uduwara,
Beragala,
Gemunupura,
Viharagala,
Koslanda,
Ambegoda,
Passara town,
Soranatota,
Demodara,
Pitapola,
Namunagala west,
Kandepuhupola,
Batawatta,
Amilagama,
Janathapura North,
Haddattawa and
Silmiyapura.
5.1 Highly landslide risk areas in Badulla district

9. This research has above mention areas faced
landslide hazard. Although those areas have
hazard frequencies are different.
5.2 Risk frequency
Frequency – 1 : Sorantota, Viharagala,
Amilagama, Haddattawa, Pitapola,
Silmiyapura, Uduwara, Ambegoda,
Janathapura North and Gemunupura
GNDs.
Frequency – 2 : Beragala,
Kandepuhulpola, Demodara, Passara
town, Maussagolla west and Batawatta
GNDs.
Frequency – 3 : Koslanda GND.

10. 5.3 Kind of landslides affected areas in Badulla District
Debris flow Cutting failture

11. Landslide Rock fall

12. 5.4 Climatic season with landslide in Badulla district
•Distribution of landslides demonstrates a
clear link with the distribution of the
seasonal rainfall.
• The records of landslides are high in the
months of on January and December.
This research mention here seasonal
wise landslide hazard in Badulla district.
First Inter Monsoon (FIM) - 3
South West Monsoon (SWM) - 1
Second Inter Monsoon (SIM) - 4
North East Monsoon (NEM) – 11
Thus, the Badulla district mostly landslide
affect by NEM.

13. This research predicts some areas very risk.
• Zone – A
• Zone – B
• Zone – C
 Zone – A will be very high landslide risk area.
Because there are many high slopes and high
mountains.
 Zone – B will be next high landslide risk area.
for the reason that there are some high slopes
and mountains.
 Zone – C will be other landslide risk area.
Other areas are normal and very low landslide
risk areas in Badulla district.
5.5 Predict high landslide risk zones in Badulla district

14. 6. Causes of landslide in Badulla district
 Topography
 Geological process
 Climate
 Improper land use building
 Erosion permitting crop
 Agriculture practices
 Construction activities
 Deforestation

15. 7. Recommendation to prevent in landslide
Reforestation
 NBRO permit
 Awareness programs
 Control the improper building
 Mitigation programs
 Suitable drainage systems
 People evacuation from high risk areas

16. 8. Conclusion
• Landslide is a severe hazard in Badulla district.
• The Badulla district has landslide, rock fall, debris flow, cutting failure,
reactivate old landslide and other type landslides in three decades.
• This research identified 17 GNDs are landslide hazard areas in district.
• Koslanda GND is more risk area.
• This research predict Zone – A is very high risk hazard zone in Badulla
district.
• The Badulla district mostly landslide affect by North east monsoon.

17. 9. Reference
• Bandara, R. M. S., (2003) Landslide in Sri Lanka, Volume-22, landslide studies
and services division, NBRO. Available from:
http://dl.nsf.ac.lk/bitstream/handle/1/5564/VIDUE-22(2)A-9.pdf?sequence=1
• http://www.desinventar.lk/des_html/disaster_profile/landslide.pdf
• http://www.dmc.gov.lk/index_english.htm
•http:/www.disastermin.gov.lk/web/index.php?option=com_content&view=fron
tpage&Itemid=1&lang=en
• http://www.ga.gov.au/scientific-topics/hazards/landslide/basics/causes
• http://www.people.uwec.edu/jolhm/eh2/rogge/causes.htm

18. Thank you