Submitted to: Transactions of the ASAE
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: October 1, 1999
Publication Date: N/A
Interpretive Summary: Certain sediment transport studies in the Laboratory require equipment that can add sediment in an uniform and consistent manner to a stream flow. A commonly used instrument for this type of research is the Syntron vibra- flow sediment feeder. Its operational principle is based on imparting a vibration of given frequency and amplitude to a hopper, which is supplied with sediment by a feeder. However, the current commerically available feeders have a hopper which is only 10 cm wide while the flow in the flume, especially in studies of shallow overland flow, required a much larger width. This paper discusses a modified Syntron vibra-flow feeder which allows the precipitation of soil and sediment particles in a stream flow of 64 cm width. The modification consists of placing a "gate" in the pathway of the sediment falling from the hopper. The diverted sediment falls then directly onto a cone-shaped sediment dispersing fan. Tests showed that the emodified feeder worked well and that an acceptable distribution of sedimen addition to the stream flow could be obtained.
An improved Syntron vibra-flow sediment feeder is designed. The improved feeder consisted of placing a "gate" in the pathway of the falling sand which then was distributed by a cone-shaped sediment dispersing fan. The feeder has all the advantages of the original feeder but can deliver sediment fairly uniformly up to a width of 64 cm. Tests with two sand sizes and one soil showed that the improved feeder works well. The maximum deviations over the delivery zone were 10%, 15.6%, and 22.1% for coarse sand, fine sand, and the soil, respectively.