Effect of Spur Dikes on Suppressing the Armoring of Drainage Canal Beds in Sloping Paddy Fields

MUKAI Akie, HORINO Haruhiko, TARUYA Hiroyuki, NAKAGIRI Takao, SAKURAI Shinji

doi:10.11408/jsidre.82.297

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傾斜地水田域の排水路床の粗粒化抑制に水制が及ぼす効果
ケイシャチスイデンイキノハイスイロショウノソリュウカヨクセイニスイセイガオヨボスコウカ

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Abstract

Armoring of drainage canal beds in sloping paddy fields is one of factors which cause deterioration in habitats of organisms. In this study, laboratory experiments were conducted to see whether armoring of sandbar surface could be suppressed by installing notched spur dikes, which have sandbar creation function, in the drainage channel bed. The result showed that armoring of sandbar surface is not suppressed mainly due to sinking of fine sand into the sandbar subsurface. However, in the actual drainage bed around the study area, suppressing of the armoring in surface layer of sandbar was observed. It was inferred that graminaceous plants became possible to settle on the sandbar due to combining the drainage bed disturbance which is common in the sloping paddy field and creation of stagnation in sandbar resulted from installing notched spur dikes, and held fine sand in the sandbar. Thus, it was concluded that notched spur dikes, although indirectly, suppress armoring of sandbar surface in the drainage bed.

Journal

Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering

Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering 82 (5), 297-304, 2014

The Japanese Society of Irrigation, Drainage and Rural Engineering

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