International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XXXIX-B8, 2012
XXII ISPRS Congress, 25 August — 01 September 2012, Melbourne, Australia
—fsunsmidamsge Ranki
Tsunami damage. RankZ
Tsunami damage, Ranki
Non-ficoded area
+ Hooded height measured by foint Survey
Gros
® Flooded height measured by MMS
A. flocdad height measured by field survey
(wu) uone^o[
Distance from coasttine (m)
Figure 11. Cross section along EW direction of ground surface
and tsunami flood depth on profile B (Sendai Airport, Iwanuma
City)
pep Tsunamidamage Ranki
Hi “Tsunami damage Rank2
-Tsunamidamage Rankà
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=
Distance from coastline (m)
Figure 12. Cross section along EW direction of ground surface
and tsunami flood depth on profile C (Mouth of Abukuma
River, Iwanuma City and Watari Town)
je Rankl
_Rank2
| Rank 5 e : 3 4 110
sres 2n
« flccded height measured &y
Joint Survey Group 70
A Flooded haight measured 60
{w)uoneasy
0
3,000
2,500
1,000
500
Distance from coastline {m}
Figure 13. Cross section along EW direction of ground surface
and tsunami flood depth on profile D (JR Yamashita Station,
Yamamoto Town)
| Tsunami damage Rand 0000007
4 ^Isunami damage sank
| Tunami damage, flanki
ep oe Non-icoded area
+ Flooded height measured by Joint Survey
- Group
| A flooded height measured by field survey
A
E
(uu) uong^o[3
8
2,500
2,000
1,000
0
Distance from coastline (m)
Figure 14. Cross section along EW direction of ground surface
and tsunami flood depth on profile E (Takase, Yamamoto
Town)
32
Tsunami damage, Rank? Jaban line
^ Tsunami damage Rank3
Non-fiocded area
* flooded height meesured by
Joint Survey Group
a Flooded height measured by
(wi) uone^aja
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A
s e 2
E 8
o =F +
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2,500
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Distance from coastline {m)
Figure 15. Cross section along EW direction of ground surface
and tsunami flood depth on profile F (JR Sakamoto Station,
Yamamoto Town)
4. CONCLUSION
The authors analyzed the relationship between tsunami flood
damage by the Great Tohoku Earthquake and geographical
condition in Sendai Plain. The completely destroyed area was
located within 1km area from the coastline, and tsunami flooded
depth of this area is over 4m. The range of this area depends on
the distance from the coastline. The heavily damaged area with
over 1.5m tsunami flooded depth was observed at the area with
less than 1m elevation up to 3 or 4km from the coastline. The
flood only area with less than 1.5m tsunami flooded depth was
observed the area with less than 2m elevation up to 4 or 5km
from the coastline. There is a good relationship between
tsunami flood damage level and tsunami flooded depth. Also,
there is a good relationship between tsunami flooded area and
elevation of ground surface. Certain area in valley plain and
flood plain was not flooded by the tsunami, even though an area
with almost the same height in coastal plain or delta was
flooded. The difference of distance from the coastline in
completely destroy area may be caused by roughness of land use.
These results mean that it is important for tsunami disaster
management to consider not only DEMs but also landform
classification and land use.
REFERENCE
The 2011 Tohoku Earthquake Tsunami Joint Research Group,
2011. Tohoku Earthquake ^ Tsunami Information,
http://www coastal. jp/ttit/ (accessed 12 April 2012)
ACKNOWLEDGEMENTS
The part of this research is supported by Grants in Aid for
Scientific Research (24240114).
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