Discussion on the Determination of Roughness Coefficient for the Main Stream of the Huaihe River

Cheng Zhiyuan; Gu Bing; Zhang Zhen; Wang Ning; Tong Ruixuan; Zhu Yujie; Zhang Xiaoyu

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Discussion on the Determination of Roughness Coefficient for the Main Stream of the Huaihe River

更新时间：2026-09-23

- Discussion on the Determination of Roughness Coefficient for the Main Stream of the Huaihe River
- PEARL RIVER Pages: 1-12(2026)
- 作者机构：
  
  安徽省水利水电勘测设计研究总院股份有限公司，安徽合肥 230088
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：11 August 2026，
  
  Revised：2026-09-16，
  
  Accepted：18 September 2026，
  
  Online First：23 September 2026，
- 稿件说明：
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程志远，辜兵，张震等.淮河干流河道糙率系数取值探讨［J］.人民珠江，DOI：10.3969/j.issn.1001-9235.XXXX.XX.001.

Cheng Zhiyuan,Gu Bing,Zhang Zhen,et al.Discussion on the Determination of Roughness Coefficient for the Main Stream of the Huaihe River[J].PEARL RIVER,
程志远，辜兵，张震等.淮河干流河道糙率系数取值探讨［J］.人民珠江，DOI：10.3969/j.issn.1001-9235.XXXX.XX.001. DOI：

Cheng Zhiyuan,Gu Bing,Zhang Zhen,et al.Discussion on the Determination of Roughness Coefficient for the Main Stream of the Huaihe River[J].PEARL RIVER, DOI：10.3969/j.issn.1001-9235...001.

摘要

糙率系数取值是大江大河洪水位推算的一个极为重要课题，近30 a历次淮河干流河道治理工程中的糙率系数取值多沿用既往成果，已难以适配淮河中游河道长期来沙减少、过流断面扩大后的洪水位推算需求。采用定性分析与定量验证相结合的方法：定性方面，开展中七大江河糙率取值类比、来沙减少引起的河床粗化分析及淮干断面套汇演变分析；定量方面，结合近年糙率系数率定与验证成果对比，并采用2020、2024年实测洪水进行复核验证。研究表明淮河干流正阳关至浮山段河道横断面呈冲刷和增大趋势，淮河干流河道糙率有所增大，河段主槽和滩地糙率系数推荐取值为0.021 0~ 0.024 5、0.033 5~ 0.039 0，其中正阳关至五河段河道较现行主槽和滩地糙率系数取值0.021 5、0.033 5增加了11%~16%。研究成果可为下一步淮河治理、数字孪生淮河流域建设和其他江河治理管理提供借鉴参考。

Abstract

The determination of roughness coefficients is an extremely important issue in flood stage estimation for large rivers. It directly affects the accuracy of computed flood levels

the rationality of flood control planning

and the safety assessment of levee systems. Over the past three decades

the roughness coefficients adopted in various channel regulation projects of the Huaihe River mainstream have largely followed previously obtained values. However

these values are no longer adequate for flood stage estimation in the middle reaches of the Huaihe River

where sediment inflow has decreased over a long period and channel cross-sections have enlarged considerably. Under such changed boundary conditions

the continued use of outdated roughness coefficients may lead to noticeable errors in computed flood stages. This study adopts a method combining qualitative analysis with quantitative verification. Qualitatively

it conducts a comparative analysis of roughness values for the seven major rivers in China

an analysis of riverbed coarsening caused by reduced sediment inflow

and an analysis of the superimposed cross-sectional evolution of the Huaihe River mainstream. These analyses provide a general reference for reasonable roughness ranges

reveal the response of bed material composition to the reduction in sediment inflow

and reflect the adjustment of cross-sectional geometry over time. Quantitatively

it incorporates a comparison of recent roughness calibration and verification results and performs verification using observed floods in 2020 and 2024. The observed floods represent typical events under current riverbed conditions and are used to test the rationality and reliability of the recommended values. Through the combination of qualitative analysis and quantitative verification

the recommended values are supported by physical mechanisms and tested against measured hydrological data. The results show that the cross-sections of the reach from Zhengyangguan to Fushan of the Huaihe River mainstream exhibit a trend of scouring and cross-sectional enlargement

and the roughness of the Huaihe River mainstream has increased to a certain extent. The recommended roughness coefficients for the main channel and floodplain of this reach are 0.021 0–0.024 5 and 0.033 5–0.039 0

respectively. For the reach from Zhengyangguan to Wuhe

the recommended values are 11%–16% higher than the currently used values of 0.0215 for the main channel and 0.0335 for the floodplain. These increases indicate that the hydraulic resistance of the Huaihe River mainstream has changed markedly under the combined effects of reduced sediment inflow

riverbed coarsening

and cross-sectional enlargement. The research results can provide references for future Huaihe River regulation

the construction of the Digital Twin Huaihe River Basin

and the regulation and management of other rivers. They can also serve as a technical basis for updating roughness parameters in flood forecasting

flood control operation

and riverbed evolution analysis.

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