THE CHARACTERISTIC AND THE MEASURE OF FALL WATER NOISE IN THE FLOODGATE OF A LOW FALL

Abstract

The noise caused by falling water from a floodgate with a low fall is investigated. In a small-scale waterway, the waterway is often located very close to a residential area, and thus measures against noise are required.

The characteristics of the noise of the floodgate with a drop difference were studied to find a solution. Sound source becomes a line source. The location of sound source becomes at a falling point of flow.

The causes of noise are classified into the sound generated at the falling point of running water, and the sound due to vibration of the water membrane as well as the sound generated when water storaged behind water membrane is flowed downstream.

In a falling point, the configuration permitting air supply is effective as the case in which a spoiler is densely installed.