Itinerary and Structures Observed - Tohoku, Japan Earthquake and Tsunami of 2011 - page 37

Table 9. List of structures visited during reconnaissance survey (May 11 - 17, 2011)

TOWN LOCATION STRUCTURE TOP OF

STRUCTURE
ELEV.
(M)

APPROX.
RUN‐UP
ELEV.
(M)

DESCRIPTION DAMAGE OBSERVED

MOMOISHI N 40.604724

E 141.462486

TSUNAMI
BARRIER

6.0 +8.3 CONCRETE WALL OVERTOPPING

HACHINOHE N 40.557871

E 141.509685

BREAKWATER Emergent
n.d.

+5.4 CONCRETE

CAISSONS ON
RUBBLE MOUND
BASE

8M WAVE OUTSIDE B/W; 6 M
WAVE INSIDE
100 CONTAINERS FLOATED AWAY
15 M WIDE CAISSONS MOVED; 16
M WIDE CAISSONS DID NOT.

TANESASHI BEACH N 40.505151
E 141.615732

BREAKWATER Emergent
n.d.

+8.5 CONCRETE

CAISSONS ON
RUBBLE MOUND
BASE

DAMAGE TO STRUCTURE AT END
POINTS; SCOUR INLAND OF
STRUCTURE

OJA SCHOOL N 40.468409

E 141.651377

VERTICAL
EVACUATION
AREA

15.6 M +11 SCHOOL GROUNDS STONE MEMORIAL TO 1933

TSUNAMI VICTIMS

NODA N 40.105056

E 141.825921

SEAWALL/DIKE 10 M (NEW)

9 M (OLD)

+12 OLD AND NEW

SECTIONS OF
CONCRETE WALL
PRESENT; OLD
SECTION HAD 2 M
X 2 M X 0.8 M
CONCRETE
'WAFFLES' FOR
ARMOR UNITS

ARMOR UNITS MOVED 75 M
INLAND;
MASSIVE SCOUR ON LANDWARD
SIDE REMOVED PACKED EARTH
CORE AND CAUSED PRECAST WALL
SECTIONS TO FAIL