Japan Sea Central Region Tsunami of May 26, 1983 A Reconnaissance Report (1984) / Chapter Skim
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TSUNAMI PROPAGATION AND COASTAL TRANSFORMATION
TSUNAMI PROPAGATION AND COASTAL TRANSFORMATION
Pages 6-19
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These large variations of bathymetry along the eastern Japanese coast profoundly affected the nearshore behavior of the tsunami. The tsunami first arrived at the eastern Japan coast about 7 minutes after the earthquake occurred.
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FIGURE 3 The detailed offshore bathymetry off the Oga Peninsula (l) , Noshiro (2)
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FIGURE 4A The first wave approaching the Oga Peninsula area at l2:l2 p.m. Source: T
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At other coastal sites the character of the main waves varied, ranging from undular bores, spilling breakers, and plunging breakers to surges at a few locations. Schematic drawings of the observed waves at various coastal sites are shown in Figure 5.
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l0 id 8 V u o CO o> c •H 1 |
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The institute simulated the bathymetry offshore of Noshiro and generated appropriate incoming waves, as shown in Figure 7. The simulation demonstrated the formation of short-period waves on the leading edge of the main wave as the wave propagated over a steep continental slope and onto a gentle continental shelf.
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It should be noted that the Japan Sea remained disturbed by the tsunami for a period of about five hours, indicating multiple reflections of the wave. Wave trapping also occurred at some coastal sites, in particular, wave activity around Oki Island (see Figure l0)
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^ U o tn si Pi oo H 3 tj en OH C o c H 0)
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FIGURE 9B Edge bore along the coastline at Hachimori. Source: K
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More detailed results by Nobuo Shuto and his colleagues at Tohoku University demonstrated a significant reduction in run-up for areas protected by breakwaters. This effect is attributed to the presence of
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16 Sakata riiigata FIGURE ll Run-up measurements along the Japan coast. Source: Shuto, l983a.
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Significant wave run-up was also observed along the Korean coast. Figure l2 gives a visual recording of run-up and run-down elevations taken in the Port of Imweon by an observer from the Korea Maritime and Port Administration.
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However, due to the slow responses of the tide gauges, the slow chart speed of the recorders, and the relatively short wave period of l0 minutes, data from the tide gauges are not very reliable. Sppli: 1 |
From page 19... ...
The bottom chart, however, indicates that there were approximately 20 waves within a six-hour interval, which implies periods of about l8 minutes. This longer wave period could be due to the effects of the harbor's response.
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