透過型砂防ダムによる泥流型土石流のピーク流量減少効果に関する研究

Translated title of the contribution: Study on effectiveness of reducing peak discharge of muddy debris flow with open type dams

水野 秀明, ヴィットリオ ボボリン, 南 哲行

Research output: Contribution to journalArticle

Abstract

Flume experiments were done to clarify the degree an open check dam lowers peak discharge of a muddy debris flow and a method of estimating the necessary conditions and anticipated discharge rate reduction were proposed. The mixture of sediment and water was set so the simulated muddy debris flow would maintain Froude similarity with the May 1998 debris flow near Sarno, Italy. The flume was 20 cm wide, 40 cm deep, and 500 cm long, and it was set at two different slopes of 5° and 10° . The wooden dam models included three slit types with widths of 5 cm, 10 cm, and 15 cm and three square conduit types with sides of 5 cm, 10 cm, and 15 cm. After the sediment and water were mixed for 6 minutes with two electric drills equipped with a special propeller in the upstream space from a gate, the gate was opened manually to create a muddy debris flow in the flume. Sampling boxes on a roller at the bottom end continuously collected the muddy debris flowing from the dam models. Both the slit and conduit dams lowered the peak flow volume. The smaller the dam dimensions, the lower the peak discharge rate. Surges were observed forming upstream from the dam models. Equation of continuity, momentum equation, and energy equation for positive surge obtained equations representing the surge formation conditions and discharge rate. Their application to the experimental results showed that the calculated values generally reproduced the test results.
Original languageJapanese
Pages (from-to)45-54
Number of pages10
Journal新砂防 = Journal of the Japan Society of Erosion Control Engineering : 砂防学会誌
Volume53
Issue number6
DOIs
Publication statusPublished - Mar 15 2001

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peak discharge
debris flow
dam
flume experiment
peak flow
sediment
momentum
water
sampling
energy
rate

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透過型砂防ダムによる泥流型土石流のピーク流量減少効果に関する研究. / 水野秀明; ボボリン, ヴィットリオ; 南哲行.

In: 新砂防 = Journal of the Japan Society of Erosion Control Engineering : 砂防学会誌, Vol. 53, No. 6, 15.03.2001, p. 45-54.

Research output: Contribution to journalArticle

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abstract = "Flume experiments were done to clarify the degree an open check dam lowers peak discharge of a muddy debris flow and a method of estimating the necessary conditions and anticipated discharge rate reduction were proposed. The mixture of sediment and water was set so the simulated muddy debris flow would maintain Froude similarity with the May 1998 debris flow near Sarno, Italy. The flume was 20 cm wide, 40 cm deep, and 500 cm long, and it was set at two different slopes of 5° and 10° . The wooden dam models included three slit types with widths of 5 cm, 10 cm, and 15 cm and three square conduit types with sides of 5 cm, 10 cm, and 15 cm. After the sediment and water were mixed for 6 minutes with two electric drills equipped with a special propeller in the upstream space from a gate, the gate was opened manually to create a muddy debris flow in the flume. Sampling boxes on a roller at the bottom end continuously collected the muddy debris flowing from the dam models. Both the slit and conduit dams lowered the peak flow volume. The smaller the dam dimensions, the lower the peak discharge rate. Surges were observed forming upstream from the dam models. Equation of continuity, momentum equation, and energy equation for positive surge obtained equations representing the surge formation conditions and discharge rate. Their application to the experimental results showed that the calculated values generally reproduced the test results.",
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