学会誌「自然災害科学」

1993年北海道南西沖地震津波の河川遡上痕跡調査とその水位再現検討

The Field Survey of the Tsunami Traces at the Riverbank and the Numerical Analysis of Tsunami Propagation in the River Due to 1993 Hokkaido Nansei-oki Earthquake

宮崎 知与*・史 亜傑**

Tomoyoshi MIYAZAKI* and Yajie SHI**

Abstract

To estimate the water level of tsunami going up the river in Hokkaido, the tsunami traces at the riverbank were investigated and the water level were calculated by a numerical method for unsteady flow in an open channel.

(1) In Shiribeshitoshibetsu river,whose bed slope is 1/2500, the water level of tsunami is going down at the upstream, and the seawater is stored in the river till the second tidal wave reaches the mouth of the river.

(2) In Aonae river, whose bed slope is 1/ 100, the water level of tsunami is going up at the upstream, and the seawater discharges back to the sea and is not stored in the river.

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