本文選題：水力坡度　切入點(diǎn)：淹沒單丁壩　出處：《水利水運(yùn)工程學(xué)報(bào)》2017年02期 　論文類型：期刊論文

【摘要】：采用超聲波水位和PIV流速測量技術(shù),在U形水槽中試驗(yàn)研究了不同水力坡度下淹沒單丁壩對(duì)水流的影響。同一水力坡度,丁壩上游橫比降沿程逐漸增大,丁壩下游橫比降沿程逐漸減小。不同水力坡度,隨著水力坡度的增大:1丁壩附近的水位、橫比降、淹沒程度和丁壩迎水面與背水面的水位差逐漸減小;2丁壩上游最高水位位置向下移動(dòng),丁壩下游水位恢復(fù)點(diǎn)位置向上移動(dòng);3斷面平均流速及最大流速逐漸增大,但最大流速出現(xiàn)的位置基本不變;4漩渦流速分布較相似,但漩渦強(qiáng)度增加,壩后漩渦中心逐漸向下游對(duì)岸移動(dòng)。當(dāng)水槽坡度為-1‰~1‰時(shí),淹沒丁壩對(duì)丁壩上方5 cm處的剖面水流影響較小;當(dāng)水槽坡度為2‰時(shí),淹沒丁壩對(duì)丁壩上方5 cm處的剖面水流影響較大;當(dāng)水槽坡度為1‰~2‰時(shí),淹沒丁壩對(duì)水流結(jié)構(gòu)的影響可能存在1個(gè)臨界變化點(diǎn)。研究結(jié)果有助于對(duì)河床演變及海岸工程等復(fù)雜水環(huán)境問題的深入探索。
[Abstract]:By using ultrasonic water level and PIV velocity measurement technique, the influence of submerged monolayer on water flow under different hydraulic slopes was studied in U-shaped flume. The lateral ratio of the spur dike decreases gradually. With the increase of the hydraulic gradient, the horizontal ratio decreases with the increase of the hydraulic gradient near the water level near the dike, The submergence degree and the water level difference between the facing surface and the back surface of the spur dike gradually decrease and the maximum water level position moves downward in the upper reaches of the second spur dike, and the average velocity and the maximum velocity of the section are gradually increasing when the position of the recovery point of the downstream water level of the spur dike moves upward. However, the position of the maximum velocity is almost the same, but the swirl intensity increases, and the center of the vortex moves to the downstream shore gradually. When the gradient of the flume is 1 鈥，

本文編號(hào)：1644619