基于植被分布的河道糙率分区及率定方法

吴乔枫; 蔡奕; 刘曙光; 蔡万贤

doi:10.14042/j.cnki.32.1309.2018.06.007

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基于植被分布的河道糙率分区及率定方法

吴乔枫, 蔡奕, 刘曙光, 蔡万贤

文章导航 > 水科学进展 > 2018 > 29(6): 820-827

吴乔枫, 蔡奕, 刘曙光, 蔡万贤. 基于植被分布的河道糙率分区及率定方法[J]. 水科学进展, 2018, 29(6): 820-827. doi: 10.14042/j.cnki.32.1309.2018.06.007

引用本文:

吴乔枫, 蔡奕, 刘曙光, 蔡万贤. 基于植被分布的河道糙率分区及率定方法[J]. 水科学进展, 2018, 29(6): 820-827. doi: 10.14042/j.cnki.32.1309.2018.06.007

WU Qiaofeng, CAI Yi, LIU Shuguang, CAI Wanxian. Roughness zoning and calibration of channel cross-section based on vegetation distribution[J]. Advances in Water Science, 2018, 29(6): 820-827. doi: 10.14042/j.cnki.32.1309.2018.06.007

Citation:

WU Qiaofeng, CAI Yi, LIU Shuguang, CAI Wanxian. Roughness zoning and calibration of channel cross-section based on vegetation distribution[J]. Advances in Water Science, 2018, 29(6): 820-827. doi: 10.14042/j.cnki.32.1309.2018.06.007

基于植被分布的河道糙率分区及率定方法

doi: 10.14042/j.cnki.32.1309.2018.06.007

吴乔枫¹,
蔡奕^1,2,,
刘曙光^1,2,
蔡万贤¹

1.
同济大学土木工程学院水利工程系, 上海 200092;
2.
长江水环境教育部重点实验室, 上海 200092

基金项目: 水利部公益性行业科研专项经费资助项目（201401057）；教育部留学回国人员科研启动基金资助项目（2013-1792）

详细信息

作者简介:
吴乔枫(1992-),男,福建连江人,博士研究生,主要从事水文模拟与水动力模拟研究。E-mail:2010wuqiaofeng@tongji.edu.cn

通讯作者:
蔡奕,E-mail:caiyi@tongji.edu.cn

中图分类号: TV131.2

Roughness zoning and calibration of channel cross-section based on vegetation distribution

1.
Department of Hydraulic Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China;
2.
The Yangtze River Water Environment Key Laboratory of the Ministry of Education, Shanghai 200092, China

摘要: 天然河流的河道综合糙率呈现出空间上的差异性和随水位（或流量）变化的动态性，但目前缺乏相关参数化方法来定量描述河道糙率的动态变化规律。尝试通过参数化方法开展受河道植被影响显著河流的糙率反演研究，用以提升模型精度。基于植被分布将河道断面划分为若干糙率不同的子区，通过率定河道断面各分区的糙率，从而反演糙率—水位曲线。在此基础上通过分析河道植被覆盖情况与河道断面特点对糙率曲线变化的影响，推求了基于分区糙率的河道断面综合糙率计算公式，从而定量描述分区糙率与综合糙率的关系。以漓江干流为例，采用该方法率定漓江干流（大溶江至阳朔段）水动力模型。结果表明：漓江干流综合糙率随水位在0.022~0.180间变化；在1.5 m的临界水深下，断面可划分为底床植被区（n=0.210）与非植被区（n=0.006），能较好地反演糙率—水位曲线并获得理想的水位模拟效果。漓江底床植被繁茂是糙率随水位变化的根本原因，断面边滩的坡度变化是糙率与水位曲线梯度变化的主要驱动因素，两者的共同作用使得糙率随着水位呈现两段式的非线性变化。
- 河道断面 /
- 综合糙率 /
- 分区糙率 /
- 底床植被 /
- 糙率—水位曲线
Abstract: The synthesis roughness of natural rivers varies with cross-sections, as well as water level and discharge. However, there are a few methods to parameterize the roughness curves (e. g., a roughness-water level curve). In order to improve the model accuracy, a significant effect of vegetation on channel roughness is considered in this research to parameterize the roughness. The channel cross-section is divided into several zones with different partition roughness based on vegetation distribution. After calibrating partition roughness values, the roughness-water level curve is obtained by using a water level-discharge relationship method. By analyzing the impact of channel cross-section characteristics and vegetation cover on the roughness curve, a formula is given for calculating the synthesis roughness of channel cross-section based on partition roughness values. This formula quantitatively describes the relationship between partition roughness and comprehensive roughness. The proposed method was used to calibrate the roughness of the hydrodynamic model of the Lijiang River. The results show that the synthesis roughness of the main channel varies in relation to water level ranging from 0.022 to 0.180. The critical depth was set at 1.5 m to divide the cross-section of the channel into the bottom-bed vegetation zone (n=0.210) and non-vegetation zone (n=0.006). Thus, the roughness-water level curve can be inverted, causing reasonable water level simulation results to be obtained. Dense vegetation in the Lijiang riverbed is the main factor causing the synthesis roughness changing with water level. The slope change of the channel cross-section is the main driving factor inducing the gradient change of the roughness-water level curve. These two factors change the cross-section synthesis roughness non-linearly in relation to water level. The results can provide a reliable reference for the hydrological forecasting of rivers in mountainous areas.
- channel cross-section /
- synthesis roughness /
- partition roughness /
- bottom-bed vegetation /
- roughness—water level curve

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[7]	陆彦, 陆永军, 李寿千. 渗流边界上推移质输沙率 . 水科学进展, 2011, 22(2): 215-221.
[8]	赖锡军, 姜加虎, 黄群. 应用最优控制理论自动率定二维浅水方程的糙率参数 . 水科学进展, 2008, 19(3): 383-388.
[9]	张玮, 钟春欣, 应翰海. 草皮护坡水力糙率实验研究 . 水科学进展, 2007, 18(4): 483-489.
[10]	杨具瑞, 方铎, 何文社, 刘兴年. 推移质输沙率的非线性研究 . 水科学进展, 2003, 14(1): 36-40.
[11]	刘晓丽, 梁冰, 薛强. 多孔介质渗透率的分形描述 . 水科学进展, 2003, 14(6): 769-773.
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基于植被分布的河道糙率分区及率定方法

doi: 10.14042/j.cnki.32.1309.2018.06.007

1. 同济大学土木工程学院水利工程系, 上海 200092;

2. 长江水环境教育部重点实验室, 上海 200092

基金项目: 水利部公益性行业科研专项经费资助项目（201401057）；教育部留学回国人员科研启动基金资助项目（2013-1792）

作者简介:
吴乔枫(1992-),男,福建连江人,博士研究生,主要从事水文模拟与水动力模拟研究。E-mail:2010wuqiaofeng@tongji.edu.cn

通讯作者: 蔡奕,E-mail:caiyi@tongji.edu.cn

收稿日期: 2018-05-21
刊出日期: 2018-12-25

中图分类号: TV131.2

关键词:

摘要: 天然河流的河道综合糙率呈现出空间上的差异性和随水位（或流量）变化的动态性，但目前缺乏相关参数化方法来定量描述河道糙率的动态变化规律。尝试通过参数化方法开展受河道植被影响显著河流的糙率反演研究，用以提升模型精度。基于植被分布将河道断面划分为若干糙率不同的子区，通过率定河道断面各分区的糙率，从而反演糙率—水位曲线。在此基础上通过分析河道植被覆盖情况与河道断面特点对糙率曲线变化的影响，推求了基于分区糙率的河道断面综合糙率计算公式，从而定量描述分区糙率与综合糙率的关系。以漓江干流为例，采用该方法率定漓江干流（大溶江至阳朔段）水动力模型。结果表明：漓江干流综合糙率随水位在0.022~0.180间变化；在1.5 m的临界水深下，断面可划分为底床植被区（n=0.210）与非植被区（n=0.006），能较好地反演糙率—水位曲线并获得理想的水位模拟效果。漓江底床植被繁茂是糙率随水位变化的根本原因，断面边滩的坡度变化是糙率与水位曲线梯度变化的主要驱动因素，两者的共同作用使得糙率随着水位呈现两段式的非线性变化。

English Abstract

Roughness zoning and calibration of channel cross-section based on vegetation distribution

1. Department of Hydraulic Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China;

2. The Yangtze River Water Environment Key Laboratory of the Ministry of Education, Shanghai 200092, China

Received Date: 2018-05-21
Publish Date: 2018-12-25

Keywords:

Abstract: The synthesis roughness of natural rivers varies with cross-sections, as well as water level and discharge. However, there are a few methods to parameterize the roughness curves (e. g., a roughness-water level curve). In order to improve the model accuracy, a significant effect of vegetation on channel roughness is considered in this research to parameterize the roughness. The channel cross-section is divided into several zones with different partition roughness based on vegetation distribution. After calibrating partition roughness values, the roughness-water level curve is obtained by using a water level-discharge relationship method. By analyzing the impact of channel cross-section characteristics and vegetation cover on the roughness curve, a formula is given for calculating the synthesis roughness of channel cross-section based on partition roughness values. This formula quantitatively describes the relationship between partition roughness and comprehensive roughness. The proposed method was used to calibrate the roughness of the hydrodynamic model of the Lijiang River. The results show that the synthesis roughness of the main channel varies in relation to water level ranging from 0.022 to 0.180. The critical depth was set at 1.5 m to divide the cross-section of the channel into the bottom-bed vegetation zone (n=0.210) and non-vegetation zone (n=0.006). Thus, the roughness-water level curve can be inverted, causing reasonable water level simulation results to be obtained. Dense vegetation in the Lijiang riverbed is the main factor causing the synthesis roughness changing with water level. The slope change of the channel cross-section is the main driving factor inducing the gradient change of the roughness-water level curve. These two factors change the cross-section synthesis roughness non-linearly in relation to water level. The results can provide a reliable reference for the hydrological forecasting of rivers in mountainous areas.

吴乔枫, 蔡奕, 刘曙光, 蔡万贤. 基于植被分布的河道糙率分区及率定方法[J]. 水科学进展, 2018, 29(6): 820-827. doi: 10.14042/j.cnki.32.1309.2018.06.007

引用本文:

吴乔枫, 蔡奕, 刘曙光, 蔡万贤. 基于植被分布的河道糙率分区及率定方法[J]. 水科学进展, 2018, 29(6): 820-827. doi: 10.14042/j.cnki.32.1309.2018.06.007

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基于植被分布的河道糙率分区及率定方法

doi: 10.14042/j.cnki.32.1309.2018.06.007

作者简介: 吴乔枫(1992-),男,福建连江人,博士研究生,主要从事水文模拟与水动力模拟研究。E-mail:2010wuqiaofeng@tongji.edu.cn

通讯作者: 蔡奕,E-mail:caiyi@tongji.edu.cn

Roughness zoning and calibration of channel cross-section based on vegetation distribution

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出版历程

基于植被分布的河道糙率分区及率定方法

doi: 10.14042/j.cnki.32.1309.2018.06.007

1. 同济大学土木工程学院水利工程系, 上海 200092; 2. 长江水环境教育部重点实验室, 上海 200092

作者简介: 吴乔枫(1992-),男,福建连江人,博士研究生,主要从事水文模拟与水动力模拟研究。E-mail:2010wuqiaofeng@tongji.edu.cn

通讯作者: 蔡奕,E-mail:caiyi@tongji.edu.cn

English Abstract

Roughness zoning and calibration of channel cross-section based on vegetation distribution

1. Department of Hydraulic Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China; 2. The Yangtze River Water Environment Key Laboratory of the Ministry of Education, Shanghai 200092, China

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目录

作者简介:
吴乔枫(1992-),男,福建连江人,博士研究生,主要从事水文模拟与水动力模拟研究。E-mail:2010wuqiaofeng@tongji.edu.cn

通讯作者:
蔡奕,E-mail:caiyi@tongji.edu.cn

1. 同济大学土木工程学院水利工程系, 上海 200092;

2. 长江水环境教育部重点实验室, 上海 200092

作者简介:
吴乔枫(1992-),男,福建连江人,博士研究生,主要从事水文模拟与水动力模拟研究。E-mail:2010wuqiaofeng@tongji.edu.cn

1. Department of Hydraulic Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China;

2. The Yangtze River Water Environment Key Laboratory of the Ministry of Education, Shanghai 200092, China