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Sediment pulse発生後における土砂の波状移動と分級現象

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Title: Sediment pulse発生後における土砂の波状移動と分級現象
Other Titles: Influence of the mobility of the coarse particles on the sediment pulse evolution in torrential rivers
Authors: 宮崎, 知与1 Browse this author
山田, 孝2 Browse this author
丸谷, 知己3 Browse this author →KAKEN DB
Authors(alt): Miyazaki, Tomoyoshi1
Yamada, Takashi2
Marutani, Tomomi3
Keywords: initial sediment pulse and its evolution
particle size sorting
the mobility of the coarse particles
magnitude of the sediment delivery
Issue Date: Jul-2008
Publisher: 砂防学会
Journal Title: 砂防学会誌
Volume: 61
Issue: 2
Start Page: 5
End Page: 15
Publisher DOI: 10.11475/sabo.61.2_5
Abstract: Understanding how sediment supply from lateral source influences on sediment distribution along a channel reach is a key issue for preliminary surveying of sediment disaster. Sediment pulse formed by storm-induced sediment supply from lateral source was investigated for four years after 2003 storm at Kita-iwanai-ninosawa Creek located in a headwater catchment of Tokachi River, Eastern Hokkaido, Japan. Cross-section measuring and sediment sampling were conducted on site, and the relationship between longitudinal changes in sediment volume transformed to a sediment mass curve and grain size distribution was examined. In this paper, the ratio of sediment delivery magnitude (M) against quasi-stream power (Ps) was employed as an efficiency index (M/Ps) of sediment transfer. The result is an follows: 1) Although storm-induced sediment pulse formed by quite lots of sediment input is not identified by deference in grain size, sediment pulses gradually reproduced by low-water flow after storm event have characteristics of grain size distribution. 2) Magnitude of sediment delivery with large materials (>75 mm) decreases downstream because of their short travel distance even by flooding. However, selective transport of smaller materials by low-water flow increases the magnitude of sediment delivery. 3) Comparing sediment mass curves, the wave peak by large-magnitude flooding is higher than that by small-magnitude flooding, and the wave length by large-magnitude flooding is shorter than that by small-magnitude flooding. 5) The efficiency index (M/Ps) of sediment transfer yielded by storm-induced sediment supply is quite high, but it gradually decreases with time after initial sediment supply.
Type: article
Appears in Collections:農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 丸谷 知己

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