Presentation on theme: "Field Survey Report on Earthquake Tsunami Disaster of Indian Ocean Field Survey Report on Earthquake Tsunami Disaster of Indian Ocean ~ Sri Lanka, Jan.4."— Presentation transcript:
Field Survey Report on Earthquake Tsunami Disaster of Indian Ocean Field Survey Report on Earthquake Tsunami Disaster of Indian Ocean ~ Sri Lanka, Jan.4 - 6, 2005 ~ Dr. T.Tomita, PARI Prof. Y.Kawata, DPRI, Kyoto Univ. Prof. F.Imamura, Tohoku Univ. Dr. T.Arikawa, PARI Dr. T.Yasuda, DPRI, Kyoto Univ.
Locatgion of Epicenter and Bathymetry data USGS: U.S. Geological Survey Hav: Harvard Univ.
Historical tsunami occurred in the Indian Ocean Historical tsunami occurred in the Indian Ocean （ Solov'iev and Go, 1975 ） DATELATLONMm 1797/ 2/100.0°N99.0°E /11/242.5°N100.5°E / 1/ 51.5°N98.0°E / 2/161.0°N97.5°E / 1/ 41.5°N97.0°E /12/ °N95.854°E9.04.0
Survey Locations Hikkaduwa Weligama Koggala Galle Dodanduwa Ambalangoda Beruwala Paiyagala Pana dula Moratuwa Colombo South-West of Sri Lanka Island Jan. 4 Jan. 5 Jan (2)
Galle Bay At first, the tide ebbed until buoy where the water depth is around 10-12m. Then, tsunami which height was 7m came into the bay. Cottage owner testified: Buoy Galle Port
Galle Port m m 6.03m The ship was launched on the quay.
m m Completely damaged Road Sand on Roof is left Eastern coast from Galle Port (1) Sand on the roof wasn’t flushed by tsunami View 1 view 1
m Few damage Road Eastern coast from Galle Port (2) View 2
Galle Fort Most area was survived.
Galle Central m m River
m 3.88m m 2.36 Road Bridge 3.90m Dodanduwa (1) View fishing boats damaged in this residential area.
Dodanduwa (2) previous slide View 2 Guide rail was broken sea Two persons who rode on the motorcycle were washed away on the bridge by the tsunami.
Akurala (1) Splashed dead leaf Road Beach Railway 1.97m1.69m Washed train 64m 188m 0.89m 9.15m 10.04m 228m The train floated and was washed away.
Hikkaduwa Fishery Harbour Wharf No damage for the buildings Tsunami trace on the 2nd floor 65 fishery boats were damaged in the port. View 1 7m 4.73m
Beruwala Fishery Harbour No damaged facilities 1.0m1.58m Wharf 6m 2.35m Harbour entrance is narrow.
Pana dura Pana dura 86m 24m Rubble mound breakwaters Broken roof Floor of shed is broken by the tsunami lift force. Shed Seawall was damaged. 3.34m 5.59m
Houses made by brick or block were collapsed. Houses made by concrete were less damaged.
Survey results of Tsunami height 5.0m
GOSL planning of restoration 0m 100m300m1000m I II III Sea I. No constructions II. Only permit constructions (e.g. hotels) III. Construction allowed with the permission of UDA GOSL also considers 3m elevation contour line.
Tsunami simulation by DRS, DPRI Governing EquationLinear Shallow Water Theory in Spherical Coordinate System Spatial Grid Size30 arc second Temporal Grid Size1.8 s Bathymetry DataETOPO2 Computational Domain SE(77°52'E, 10°24'S)- NW(111°12'E, 22°56'N) Seismic DeformationYamanaka(2004) Computed Time6 hrs Fault Parameter (Yamanaka, 2004)