Advanced Geographic Information System

GGY-451

S. Lathiscumar,

A/11/427,

Department of Geography,

Faculty of Arts,

University of Peradeniya.

Topic: The landslide hazard in Badulla district

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

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.

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.

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 LandslideDepartment of Disaster

management

Sri Lanka

4. Research areaThe 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).

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

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.

5.3 Kind of landslides affected areas in Badulla District

Debris flow Cutting failture

Landslide Rock fall

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.

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

6. Causes of landslide in Badulla district

Topography

Geological process

Climate

Improper land use building

Erosion permitting crop

Agriculture practices

Construction activities

Deforestation

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

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.

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

Thank you