Kajian Angkutan Sedimen Pada Saluran Curam Dengan Material Dasar Halus

Abstract: Sediment transport formula available in literature were generally developed based on two common conditions, i.e.: 1). for alluvial rivers with mild slopes and small size of bed materials, and 2). for mountain rivers with steep slopes and large size of bed materials. In parctice, however, there are also many rivers which do not follow the general rivers as explained above. The such "special" rivers are found in mountain regions, thus they have steep slopes, however their bed materials are small due to their mineral compositions. In order to know whether the known formula of sediment transport available in literature are still remain valid or not to predict sediment transport for "special" rivers as explained above, series of measurements data obtained from the Hydraulic and Hydrology Laboratory, 1UC, Gadjah Mada University were used as a base of investigation. Two kinds of sediments were usedas a base of comparation, i.e., the sediment I with d50 = 0.421 mm and the non-uniformity parameter, Q(= log (d84/d50)) = 0,52, and the sediment II with d50 =1.229 mm and a = 0,24. The bed slopes were varied between 0,01 % to 0,02 %, while the flow discharges variedfrom 0,009 to 0,049 m3/cit. From the investigation of the data used in this study, the following conclusions might be drawn: 1). almost the most available formula found in the literature could not be used to predict the present "special" flume dat