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2004 Tsunami Coastal Change Detection Analysis

Created by Ben ScianceGGY 522Dr. Ghoneim

http://maps.ngdc.noaa.gov/viewers/hazards/#

http://maps.ngdc.noaa.gov/viewers/hazards/#

Sumatra-Andaman Earthquake:

December 24, 20047:58AM

9.3 magnitude

1400km rupture along plates

3rd strongest earthquake since 1900

- Run a change detection analysis in areas severely affected by tsunami.

- Which landuse class is most greatly affected?

- Is the area recovering?

Objective

1) Southeast coast of Sri Lanka- 100,000 + families affected

2) Banda Aceh, Indonesia- 1 million people affected throughout Indonesia

Study Area

http://www.navy.mil/view_single.asp?id=21839

2001

2005

Water Bare Urban Vegetation Row Total

Class Total

Vegetation 1.4778 99.2655 5.4306 103.5036 209.6775 209.7378

Water 414.5859 5.1768 0.0189 0.0531 419.8347 419.8392

Urban 0.0135 9.6534 40.4838 2.3229 52.4736 52.4754

Bare 5.4495 110.5164 1.4202 4.4433 121.8294 121.8411

Masked Pixels 0.0009 0.081 0.0027 0.0153 0.09991765.326

6

Class Total 421.5276 224.6931 47.3562 110.3382 0 0

Class Changes 6.9417 114.1767 6.8724 6.8346 0 0

Image Difference -1.6884 -102.852 5.1192 99.3996 0 0

  Vegetation Water Urban Bare Row Total Class Total

Water 7.4502 410.4612 0.1791 3.4281 421.5186 421.5276

Bare 143.8407 7.4205 16.461 56.8899 224.6121 224.6931

Urban 8.3871 0.1071 36.0288 2.8296 47.3526 47.3562

Vegetation 105.1938 0.2493 2.0781 2.7981 110.3193 110.3382

Masked Pixels 0.09 0.0018 0.0009 0.0054 0.0981 1765.305

Class Total 264.9618 418.2399 54.7479 65.9511    

Class Changes 159.768 7.7787 18.7191 9.0612    

Image Difference -154.6236 3.2877 -7.3917 158.742    

Table A: Sri Lanka Change Detection Matrix of Pre-Post Tsunami (km²)

Table B. Sri Lanka Change Detection Matrix of Post tsunami and recent landsat image (km²)

Vegetation Water Urban Bare Row Total Class Total

Vegetation 10.1934 0.153 0.6318 2.5092 13.4874 13.4892

Water 1.6695 25.5798 0.2196 0.7209 28.1898 28.1898

Urban 3.4101 0.027 11.2104 0.504 15.1515 15.1569

Bare 8.1189 3.1779 5.1003 1.5975 17.9946 17.9982

Masked 0.0126 0.0027 0.0108 0.0036 0.0297 77.5116

Class Total 23.4045 28.9404 17.1729 5.3352 0 0

Class Changes

13.2111 3.3606 5.9625 3.7377 0 0

Image Difference

-9.9153 -0.7506 -2.016 12.663 0 0

Table C. Banda Aceh Change Detection Analysis of the 2004 Tsunami.

SummarySri Lanka: - 160km² of vegetation lost- 16km² of coastal villages were affected- Local water bodies increased in area by almost 8km²

Recovery:-Vegetation gain of 99km²-Villages grow almost 6km²

Banda Aceh:- Lost 8km² of vegetation- Urban areas lost about 5km²

Further Analysis:- ArcMap DSAS tool- quantify shoreline loss in Banda Aceh

Questions?

ReferencesBorrero, J.C. 2005. Field Data and Satellite Imagery of Tsunami Effects in Banda Aceh. Science 308 (5728): 1596.Dimri, A.V., Srivastava, K., and Rani, V.W. 2011. Tsunami propagation and inundation due to tsunamigenic earthquakes in the Sumatra-Andaman subducation zone: Impact at Visakhapatnam. Marine Geodesy 34: 48-58Stein, S. and E. Okal. 2005. Speed and size of the Sumatra earthquake. Nature 434:581–582.

http://geosun.sjsu.edu/~sedlock/112/Dec04IndOcean.tsunami/Dec04IndOcntsunami.htm

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