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Impacts of the 2004 Indian ocean tsunami on the southwest coasts of Sri Lanka

By:
, , and
DOI: 10.1061/40926(239)82

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Abstract

The 2004 Indian Ocean tsunami caused major landscape changes along the southwest coasts of Sri Lanka that were controlled by the flow, natural topography and bathymetry, and anthropogenic modifications of the terrain. Landscape changes included substantial beach erosion and scouring of return-flow channels near the beach, and deposition of sand sheets across the narrow coastal plain. In many areas tsunami deposits also included abundant building rubble due to the extensive destruction of homes and businesses in areas of dense development. Trim lines and flow directions confirmed that shoreline orientation and wave refraction from embayments and rock-anchored headlands locally focused the flow and amplified the inundation. Tsunami deposits were 1 to 36 cm thick but most were less than 25 cm thick. Deposit thickness depended partly on antecedent topography. The deposits were composed of coarse to medium sand organized into a few sets of plane parallel laminae that exhibited overall upward fining and landward thinning trends.

Geospatial Extents

Additional Publication Details

Publication type:
Conference Paper
Publication Subtype:
Conference Paper
Title:
Impacts of the 2004 Indian ocean tsunami on the southwest coasts of Sri Lanka
ISBN:
0784409269; 9780784409268
DOI:
10.1061/40926(239)82
Year Published:
2007
Language:
English
Publisher:
American Society of Civil Engineers
Contributing office(s):
Coastal and Marine Geology Program
Description:
14 p.
Larger Work Type:
Book
Larger Work Subtype:
Conference publication
Larger Work Title:
Coastal Sediments '07 - Proceedings of 6th International Symposium on Coastal Engineering and Science of Coastal Sediment Processes
First page:
1061
Last page:
1074
Conference Title:
6th International Symposium on Coastal Engineering and Science of Coastal Sediment Processes
Conference Location:
New Orleans, LA
Country:
Sri Lanka