| 杨克君,曹叔尤,刘兴年.复式河槽综合糙率计算方法比较与分析[J].水利学报,2005,36(7):0780-0786 |
| 复式河槽综合糙率计算方法比较与分析 |
| Analysis on methods for predicting composite roughness of river channel with compound cross section |
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| DOI： |
| 中文关键词: 复式河槽 综合糙率计算方法 比较与分析 相对误差 方法 |
| 英文关键词: composite roughness of river compound cross section calculation method comparison improved method |
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| 中文摘要: |
| 综合糙率是复式河槽水力计算的一个重要参数。本文系统地总结了推求综合糙率的各种典型方法，包括Pavlovskij方法，Einstein-Banks方法，Lotter方法，Krishnamurthy-Christensen方法以及Dracos-Hardegger方法。运用277组复式河槽水槽实验资料和野外实测资料，验证了上述各种方法的有效性。通过比较和分析，发现这些方法都不适用于估算复式河槽综合糙率。本文对这些方法产生误差的原因进行了分析，并指出产生误差的原因在于前四种方法忽略了滩槽动量交换；后一种方法虽然考虑了动量交换，但该方法并不普遍适用。本文对现有资料的分析，提出了一个滩槽糙率相同情况下的复式河槽综合糙率关系式。 |
| 英文摘要: |
| Experimental result and field observation data are used to check the validity of the currently used methods for predicting composite roughness of river channel including the Pavlovskij Method, Einstein-Bank Method, Lotter Method, Krishnamurthy-Christensen Method and Drasco-Hardegger Method. The comparison shows that the accuracies of the first four methods are poor and they are not suitable for predicting the roughness of river channel with compound cross section due to neglecting the momentum transformation. The last method cannot be used popularly since it is an empirical formula, in spite of the transfer of momentum is considered.Based on the data obtained an improved method for calculating the roughness of river having the same roughness in main channel and floodplain is proposed. |
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