ADVANCES IN MEASURING TECHNIQUES OF BED LOAD

I.m~UCrIONBedloadisthesedimentwhichmovesalongtheriverbedintheformofrolling,slidingandsaltation.BedloadmaycreatemanyproblemsintheoperationandmaintenanceofnavigationchannelandinthedevelOPmentofhydroelectricity.Dataofbedloaddischargearealsorequiredinthedesignofreservoir,inwhichtheinflowbedloadareallactuallytrapped.Thewaysofbedloadmotionaredifferentfordifferentsizes.Thus,itisextremelydifficulttodeterminethebedloaddischargeaccurately.Manyequationshavebeenproposedtocalculatethebedloaddischarge.H…

ADVANCES IN MEASURING TECHNIQUES OF BED LOAD

Bed load is an important component of total load transportation. The accuracy of bed load measurement depends on the measuring equipment and sampling method. In this paper, the present situation of bed load measurement is introduced, the structure features and the sampling performance of bed lead samplers currently used in the world is evaluated. Results of field comparison of HS and TR2 type samplers used in USA, Don type sampler used in former USSR, and Chinese made Y78-1, Y80, AWT160, MB2 samplers have been summarized. From statistical point of view, selection of sampling verticals, and duration and number of repetitions in a vertical in the bed load measurement were studied. The error might be minimized if the sampling verticals were selected on the basis of equal partial bed load discharge. Finally, some data processing methods are recommended, which have been applied to the Changjiang River.