SEDIMENT TRANSPORT EXPERIMENTATION BY USING A PHYSICAL MODEL - EXPERIENCES LEARNED

摘要

This paper deals with the experiences learned from a sediment transport study conducted on a flume channel in the Hydraulic Engineering Lab., University of Manitoba (Canada), during 2002-2003. It includes flume design features, characteristics of used sediment material and problems faced in obtaining it in the cold region. Difficulties faced with the usage of SonTek ADV's and Kent Miniflo (type 265) plus Kent Probe (265-3-16, propeller type) have been discussed. Performance of the Miniflo has been compared with the Magnum Flowmeter (attached with magnetic insertion probe). At smaller flow rates very significant differences were found in the quantities recorded by both of the devices. The Magnum Flowmeter always measured low discharges and its performance was very unreliable at smaller flow rates. Relationship between the flow rates recorded by these two devices improved with the increase in flow rates. Three functions were developed to define relationship between the Miniflo and Magnum Flowmeter recorded data by using (1) all the 185 data sets together (2) 1-107 data sets in descending order and (3) 108-165 data sets in descending order, each having square of correlation coefficient (R~2) greater than 95%.