Applied Geomorphology for Mitigation of Natural Hazards by Masahiko Oya (auth.)

By Masahiko Oya (auth.)

There are many typical risks similar to floods, landslides, volcanoes and earthquakes within the Asia-Pacific quarter. however, there are few stories of such traditional risks during this area and information approximately their mitigation is of the maximum significance.
This ebook files using geomorphological maps exhibiting the kingdom of flooding; those maps permit predictions to be made. the writer has compiled geomorphological maps and documentation in their validation, and the maps enable not just estimation of flooding, but additionally prediction of soil liquefaction as a result of earthquakes.
Audience: the result of the discussions during this publication follow not just to geographers, experts, engineers and coverage makers in Japan and Southeast Asian nations, but additionally to these from Europe, North the United States, and Africa.

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30 CHAPTER) N + KITAKAMI MOUNTAINS Yamada Bay SANRIKU COAST PACIFIC OCE Figure 3. 7 Sanriku Coast (Oya, 1962; modified) VALIDATION OF A GEOMORPHOLOGICAL SURVEY MAP 31 Besides the rias-type coasts and embayments, sand bars connecting an island with a main island, such as Kiritappu in east Hokkaido, are also affected by tsunami. Rias-type coasts or embayments are classified into several types, including Ushaped, V-shaped, W-shaped and half-moon shaped. AU-shaped embayment often has an irregular pattern, and some of the embayments are separated by barriers into several parts (Figure 3.

Thus, in the middle reaches of the Chikugo River, erosion is more important than deposition due to changes brought on by human work. In this area inundation is minor and deposition limited. However, the topography makes it inconvenient for water use. Moats, which are well developed in the lower reaches of the Chikugo River, are countermeasures to this condition of water shortage. , 1957; Oya, 1973b, 1977a). _I ··... + N m ·····... 800 ~() 6 4\......... ~~ ~ ~ i § ~ "' ····~................................

5. PROFILE OF INUNDATION As tsunami proceed inland, the great resistance of the land surface to the current causes the water depth to decrease rapidly. 1 0. As each wave may last about 30 to 40 minutes, the profile must be considered as representing the maximum wave level at each point. As the depth of water rapidly decreases, tsunami are eventually stopped by landforms. Generally speaking, their limits are established by the boundaries of valley and delta plains. 6. CONCLUSIONS a) The Chilean tsunami is considered to be a model for tsunami research.

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