Study on the Method of Predicting the Low Frequency Noise and Characteristic of Nappe Oscillation at Weir

获取了在闸门落差高度为2m时实际用于河道或灌溉渠道的设计手册。从而明确了落差高度为2m的闸门内发生水幕振荡的特性。结果表明，存在一个在低频噪声中表现优异的频率成分。此外，还提出了抑制水筛振荡的装置，实验结果表明，该装置对防止水筛振荡是有效的。

The design manual when installing in the floodgate to the fall height 2 m grade actually used for the river or the irrigation canal was acquired. As a result, the characteristic of water screen oscillation which takes place in a floodgate with a fall height of 2m was clarified. It was shown that there is a frequency ingredient which excelled in the low frequency noise. Moreover, the equipment which suppresses water screen oscillation is proposed, and it is shown that it is effective in prevention of water screen oscillation.