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標題: Study of bed friction factor for the Wu River estuary
作者: Lan, C.W.
Lee, C.C.
關鍵字: estuary;Manning' s coefficient;celerity reduction factor;damping;modulus;resistance coefficient
Project: China Ocean Engineering
期刊/報告no:: China Ocean Engineering, Volume 20, Issue 4, Page(s) 557-572.
In this research the bed friction effect is estimated of a river estuary by use of hydrodynamic analysis. The on-site sampled data of the Wu River estuary is applied to the analysis. There are many dynamic factors that affect the flow characteristics in the estuary. The effect of tide on the generation of tidal current, bottom friction and geometry effect is the focus of this paper. The Wu River estuary is about 15 km in length, with a small bottom slope and no physical obstruction; thus the incident wave at the estuary is considered a progressive wave with damping effect. The amplitude reduction and phase shift of the incident wave are analyzed. By the analysis of celerity reduction factor of the estuary, the estimated value of mean resistance coefficient M (mu, kappa), damping modulus mu, and wave number kappa gathered from on-site observations are applied for validation. Finally, Manning's coefficient for each section of the observation stations can be determined. It is found that the value of Manning's coefficient is small downstream and increases towards upstream, and that the bed friction effect of an estuary varies largely. The estimated results of the paper are compared with the empirical formulas and the modified solution for practical application is discussed.
ISSN: 0890-5487
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