Stability shear stress and equilibrium cross-sectional geometry of sheltered tidal channels
文献类型：期刊论文
| 作者 | Carl T.Friedrichs |
| 刊名 | Journal of Coastal Research
 |
| 出版日期 | 1995 |
| 卷号 | 11期号:4页码:1062-1074 |
| 关键词 | Estuaries Tides Morphodynamics |
| ISSN号 | 0749-0208 |
| 英文摘要 | This study relates tidal channel cross-sectional area (A) to peak spring discharge (Q) via a physical mechanism, namely the stability shear stress ( tau sub(S)) just necessary to maintain a zero gradient in net along-channel sediment transport. It is assumed that if bed shear stress ( tau ) is greater than tau sub(S), net erosion will occur, increasing A, and reducing tau similar to (Q/A) super(2) back toward tau sub(S). If tau < tau sub(S) there will be net deposition, reducing A and increasing tau toward tau sub(S). A survey of the literature allows estimates of Q and A at 242 sections in 26 separate sheltered tidal systems. Assuming a single value of tau sub(S) characterizes the entire length of a given tidal channel, it is predicted that along-channel geometry will follow the relation Ah sub(R) super(1) super(/) super(6) similar to Q. Along-channel regressions of the form Ah sub(R) super(1) super(/) super(6) similar to Q super( beta ) give a mean observed value for beta of 1.00 plus or minus 0.06, which is consistent with this concept. Results indicate that a lower bound on tau sub(S) (and an upper bound on A) for stable channels is provided by the critical shear stress ( tau sub(C)) just capable of initiating sediment motion. Observed tau sub(S) is found to vary among all systems as a function of spring tidal range (R sub(sp)) according to the relation tau sub(S) approximately 2.3 R sub(sp) super(0.79) tau sub(C). Observed deviations from uniform tau sub(S) along individual channels are associated with along-channel variation in the direction of maximum discharge (i.e., flood-versus ebb-dominance). |
| 语种 | 英语 |
| 公开日期 | 2010-12-24 |
| 源URL | [http://ir.yic.ac.cn/handle/133337/2998]  |
| 专题 | 烟台海岸带研究所_科研共享资源 |
| 推荐引用方式 GB/T 7714 | Carl T.Friedrichs. Stability shear stress and equilibrium cross-sectional geometry of sheltered tidal channels[J]. Journal of Coastal Research,1995,11(4):1062-1074. |
| APA | Carl T.Friedrichs.(1995).Stability shear stress and equilibrium cross-sectional geometry of sheltered tidal channels.Journal of Coastal Research,11(4),1062-1074. |
| MLA | Carl T.Friedrichs."Stability shear stress and equilibrium cross-sectional geometry of sheltered tidal channels".Journal of Coastal Research 11.4(1995):1062-1074. |
入库方式： OAI收割
来源：烟台海岸带研究所
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