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Gu F.,Shanghai Estuary and Coastal Science Research Center | Mu L.,State Oceanic Administration | Qi D.,Shanghai Estuary and Coastal Science Research Center | Li J.,Shanghai Maritime University | And 2 more authors.
Acta Oceanologica Sinica | Year: 2011

The influence of density, foliage and stem flexibility on the roughness coefficients under unsubmerged conditions, such as Manning's n, is investigated experimentally. An instrumentation system has been developed for measuring the flow rate ranging from 0.1 to 0.3 L/s under the condition of different artificial foliated reeds. Based on the experimental results, the influence on the relationship between n with different density, foliage, flexibility and flow depth is discussed. It is found that the foliage and the density are the important factors affecting Manning's n. At a range of relatively low velocity and relatively large bending stiffness of stem, Manning's n is not influenced significanthy by the flexibility of stem. © The Chinese Society of Oceanography and Springer-Verlag Berlin Heidelberg 2011.


Kong L.,Shanghai Estuary and Coastal Science Research Center | Cao Z.,Tianjin Research Institute for Water Transport Engineering | Wang W.,Shanghai Estuary and Coastal Science Research Center | Qi D.,Shanghai Estuary and Coastal Science Research Center
Acta Oceanologica Sinica | Year: 2011

The rotary ring flume is used to study the silty sand movement in a periodic alternating current. Characteristics of sediment movement of different coasts in the tidal current are summarized. More detailed analysis of erosion-sedimentation function in a numerical simulation is made. The equilibrium sediment concentration is advanced. Based on the equilibrium sediment concentration, the seabed erosion-sedimentation index is derived and the seabed erosion-sedimentation calculation is analyzed. The seabed erosion-sedimentation index is used to calculate the seabed evolution of Yangshan sea area and a good agreement with field measurements is obtained. © The Chinese Society of Oceanography and Springer-Verlag Berlin Heidelberg 2011.

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