文献类型：期刊文献

英文题名：Determination of Emergent Vegetation Effects on Manning's Coefficient of Gradually Varied Flow

作者：Zhang, Huayong[1] Wang, Zhongyu[1] Xu, Weigang[2] Wang, Hualin[1]

第一作者：Zhang, Huayong

通信作者：Zhang, HY[1]

机构：[1]North China Elect Power Univ, Res Ctr Engn Ecol & Nonlinear Sci, Beijing 102206, Peoples R China;[2]Chinese Acad Forestry, Inst Wetland Res, Beijing 100091, Peoples R China

年份：2019

卷号：7

起止页码：146778-146790

外文期刊名：IEEE ACCESS

收录：;EI(收录号：20200608135641);Scopus(收录号：2-s2.0-85078929105);WOS:【SCI-EXPANDED(收录号:WOS:000498850800001)】；

基金：This work was supported in part by the Chinese National Major Science and Technology Program for Water Pollution Control and Treatment under Grant 2017ZX07101-002, Grant 2015ZX07204-007, and Grant 2015ZX07203-011, in part by the Chinese Fundamental Research Funds for the Central Universities under Grant 2017MS055, and in part by the Department of Environmental Protection of Shandong Province under Grant SDHBPJ-ZB-08.

语种：英文

外文关键词：Manning's coefficient; vegetal component of Manning's coefficient; rigid unsubmerged vegetation; gradually varied fiow; vegetation coverage area ratio

摘要：Based on mechanical derivation, a new formula showing the effects of emergent vegetation on Manning's coefficient was established for complex gradually varied fiow affected by rigid unsubmerged vegetation in open channels. The new formula indicates that the Manning's coefficient is a quadratic sum of its vegetal and boundary components with coefficients related to vegetation parameters. The variation characteristics of the total Manning's coefficient and its vegetal component calculated by the new formula were investigated by a series of laboratory experiments under different vegetation coverage area ratios. It was found that the variations of both the total Manning's coefficient and its vegetal component followed a linear decreasing trend along the vegetation section. Moreover, linear and power empirical formulas were constructed for the average total Manning's coefficient and its vegetal component related to the vegetation coverage area ratio, respectively. The findings of the research may expand the theoretical connotations of the Manning's coefficient for open channel hydraulics and demonstrate practical significance to engineering applications of the Manning's coefficient for gradually varied fiow in vegetated channels.