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Applications in New River-meander Model DOI:  https://doi.org/10.30564/jgr.v3i1.1896 Abstract If the sediment transport behaves as bed-load, the sediment surface at meandering channel will deform into transverse waves.This investigation is a new model for prediction of river-meander models in nature.The aim of this research is to give a precise method whose bed forms can have a variety of scales ranging from ripples through small dunes to fully developed dunes or sandwaves.Its mathematical model will be investigated. Keywords:  Sand waves, Sediment, Meandering, Transportation

Development of River Meander Model DOI:  https://doi.org/10.30564/jgr.v3i1.1845 Abstract In the studies of open-channel flow with suspended sediments, used a constant of Von Karman κ in a model for velocity profile. The augmentation parameters have been added by various researchers in more recent development of the boundary-layer theory of meander development. In this research new parameters will be included because of the existence of the turbulent flow region in meandering channels because of boundary-layer theory. Keywords:  Meander, Flow, Model, Boundary layer, Sediment

Applications in New River-meander Model DOI:  https://doi.org/10.30564/jgr.v3i1.1896 Abstract If the sediment transport behaves as bed-load, the sediment surface at meandering channel will deform into transverse waves.This investigation is a new model for prediction of river-meander models in nature.The aim of this research is to give a precise method whose bed forms can have a variety of scales ranging from ripples through small dunes to fully developed dunes or sandwaves.Its mathematical model will be investigated. Keywords:  Sand waves, Sediment, Meandering, Transportation

Development of River Meander Model DOI:  https://doi.org/10.30564/jgr.v3i1.1845 Abstract In the studies of open-channel flow with suspended sediments, used aconstant of Von Karman κ in a model for velocity profile. The augmentation parameters have been added by various researchers in more recentdevelopment of the boundary-layer theory of meander development. In thisresearch new parameters will be included because of the existence of theturbulent flow region in meandering channels because of boundary-layertheory. Keywords:  Meander, Flow, Model, Boundary layer, Sediment

Microbial Community Diversity and Vertical Distribution in a Columnar Sediment of Maluku Strait DOI:  https://doi.org/10.30564/jasr.v2i2.930 Abstract The sediment samples were collected from Maluku Strait at a depth of 1250 m, which is influenced by Mindanao Current and Indonesian Throughflow. Based on 16S rRNA clone libraries, the community structure and vertical distribution of archaea and bacteria were studied in a columnar sediment of 2m in length. From the surface sediment, 16S sequences were derived from fourteen bacterial phyla (Gammaproteobacteria, Planctomycetes, Alphaproteobacteria, Deltproteobacteria were dominant), but were limited to two groups of archaea: Crenarchaeota (99%) and Euryarchaeota (1%). Besides, 90% of the archaea clones were ammonia oxidation-related which indicated that the ammonia-oxidizing archaea might make a significant contribution to the chemosynthesis in the surface sediment. Contrastively in the bottom sediment, six bacterial phylogenetic groups ...

Development of River Meander Model DOI:  https://doi.org/10.30564/jgr.v3i1.1845 Abstract In the studies of open-channel flow with suspended sediments, used aconstant of Von Karman κ in a model for velocity profile. The augmentation parameters have been added by various researchers in more recentdevelopment of the boundary-layer theory of meander development. In thisresearch new parameters will be included because of the existence of theturbulent flow region in meandering channels because of boundary-layertheory. Keywords Meander;Flow;Model;Boundary layer;Sediment Full Text: PDF

Applications in New River-meander Model DOI:  https://doi.org/10.30564/jgr.v3i1.1896 Abstract If the sediment transport behaves as bed-load, the sediment surface at meandering channel will deform into transverse waves.This investigation is a new model for prediction of river-meander models in nature.The aim of this research is to give a precise method whose bed forms can have a variety of scales ranging from ripples through small dunes to fully developed dunes or sandwaves.Its mathematical model will be investigated. Keywords Sand waves;Sediment;Meandering;Transportation Full Text: PDF