巻号一覧
30 巻 (2003)
- 4 号 p. 305-
- 3 号 p. 181-
- 2 号 p. 135-
- 1 号 p. 48-
30 巻, 2 号
選択された号の論文の1件中1～1を表示しています
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蜂屋 弘之, 春日 健太郎, 木下 武雄2003 年 30 巻 2 号 p. 135-141
発行日: 2003/04/01
公開日: 2011/03/02
ジャーナル フリーIt is required a continuous measurement of the flow speed and flow rate in the river at the flood, but there is yet no effective measurement technique. The purpose of this study is the quantitative examination of the measurement defect and sound propagation characteristics for measuring river flow velocity and rate in the flood using ultrasound. We have continuously observed the sound propagation characteristics in various river situations. In this paper, the sound propagation characteristics and the defect factor of flow velocity measurement in the snow melting flood were examined quantitatively. We found the impulsive noise which rapidly increased with flow velocity obstructed the velocity measurement and the center frequency of the impulse noise was over 150 kHz.抄録全体を表示PDF形式でダウンロード (959K)
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