Study on roughness coefficient for unsubmerged reed in the Changjiang Estuary |
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| Authors: | GU Fengfeng MU Lin QI Dingman LI Junhu KONG Lingshuang and WAN Yuanyang |
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| Institution: | 1.Shanghai Estuary and Coastal Science Research Center, Shanghai 201201, China2.National Marine Data and Information Service, State Oceanic Administration, Tianjin 300171, China3.College of Ocean Environment and Engineering, Shanghai Maritime University, Shanghai 200135, China |
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| Abstract: | 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. |
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| Keywords: | Manning's coefficient foliage density flexibility reed |
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