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TOPOGRAPHICAL AND GEOLOGICAL CHARACTERISTICS OF ZERO-ORDER BASINS WHERE DEBRIS FLOWS OCCURRED BY HEAVY RAIN IN JULY, HEISEI 30
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- NAKAJIMA Noboru
- 株式会社地研 事業部
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- YOSHIOKA Megumu
- 構営技術コンサルタント株式会社 技術1部
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- NAKANE Hisayuki
- 株式会社地研 事業部
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- MIYAJI Shuichi
- 株式会社地研 事業部
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- HARA Tadashi
- 高知大学 理工学部地球環境防災学科
Bibliographic Information
- Other Title
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- 平成30年7月豪雨で土石流が生じた0次谷の地形・地質的特性
Description
<p> Heavy rain in July, Heisei 30 caused an enormous damage mainly around Western Japan. Otsuki-cho, Hata-gun, Kochi-prefecture also suffered human damage by sediment disasters. The sediment disasters of this town included debris flows from Zero-order basins. The flows consisted mainly of rapidly flowing debris and slided farther than in the case of surface failures reaching even the flat fields. Zero-order basins, however, are defined as steep slopes. The countermeasures against sediment flows are not applicable for them. Our research suggests these facts as conditions for Zero-order basins which cause debris flowing ; stream bed deposit is over 2 meters deep, streams is over 100 meters long. Slope of bed stream is over 30 degrees, visible water catchment area is above the Zero-order basins. From the fact that the debris flows occurred at the Zero-order basins with the ratio of opening to depth over 22 percents, it became clear the ratio of opening to depth maybe one of the conditions for defining the Zero-order basins causing debris flows.</p>
Journal
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- Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering)
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Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 75 (1), 184-190, 2019
Japan Society of Civil Engineers
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Details 詳細情報について
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- CRID
- 1390002184855337088
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- NII Article ID
- 130007769857
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- ISSN
- 2185467X
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- Text Lang
- ja
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- Data Source
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- JaLC
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed