| Sediment hydraulics have studied by several historical figures; e.g., H. Albert Einstein, J. F. Kennedy, M. Selim Yalin and many others, whose most of their studies have conducted in the experimental flumes. Thanks to recent technologies, varieties of the measurement were widely extended. The recent technologies here mean not only mechanical aspects (by the largest contribution by Teledyne RDI), but also data analysis (by several different researchers). With such a technology, water flow/sediment transport rate can be understood in actual river as if we conduct experimental studies. Therefore, it could be good way to verify the past achievement with the observational results, regarding bedload functions, suspended sediment load, size of bed forms, flow resistance and others. It is also good chance to improve the knowledge of the sediment hydraulics. The authors have worked for this kind with Acoustic Doppler Current Profiler (ADCP) and others. Here, authors will report the behavior of suspended sediment. The authors conducted the field survey in the Brahmaputra river in Bangladesh with ADCP, sediment samplers and others. The authors experienced many different flow fields including the flat bed, bed form with/without boiling phenomena. With using randomly measured flow field and sediment transport rate, 2-D gird data sets were created using the inverse distance weighted (IDW) interpolation, as well as the mass-consistence method. Those data sets were plugged into the transportation equation of fine sediment, and Erosion terms are obtained. The results show some agreement and disagreement depending on the condition. |
