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The purpose of this study is to develop a measurement method for suspended sediment using ultrasonic wave. Some experiments were carried out to measure suspended sediment concentration and echo intensity reflected by suspended sediment in a tank, and the relationship between measured concentration and echo intensity was investigated. The experimental results show that the relationship is consistent in the experimental condition with the wide range of sand grain size and mass concentration without information of sand grain size in suspended sediment, while the measurement by an optical turbidity sensor needs this information to estimate mass concentration from turbidity. Furthermoreit is indicated that the measurement method using ultrasonic wave may be possible to measure suspended sediment spatially.

Development of Measurement of Suspended Sediment using Ultrasonic Wave