刚性植被区域床面泥沙起动特性

薛万云; 吴时强; 吴修锋; 戴江玉; 杨倩倩; 王芳芳

doi:10.14042/j.cnki.32.1309.2017.06.006

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刚性植被区域床面泥沙起动特性

薛万云, 吴时强, 吴修锋, 戴江玉, 杨倩倩, 王芳芳

文章导航 > 水科学进展 > 2017 > 28(6): 849-857

薛万云, 吴时强, 吴修锋, 戴江玉, 杨倩倩, 王芳芳. 刚性植被区域床面泥沙起动特性[J]. 水科学进展, 2017, 28(6): 849-857. doi: 10.14042/j.cnki.32.1309.2017.06.006

引用本文:

薛万云, 吴时强, 吴修锋, 戴江玉, 杨倩倩, 王芳芳. 刚性植被区域床面泥沙起动特性[J]. 水科学进展, 2017, 28(6): 849-857. doi: 10.14042/j.cnki.32.1309.2017.06.006

XUE Wanyun, WU Shiqiang, WU Xiufeng, DAI Jiangyu, YANG Qianqian, WANG Fangfang. Sediment incipient motion on movable bed in rigid vegetation environment[J]. Advances in Water Science, 2017, 28(6): 849-857. doi: 10.14042/j.cnki.32.1309.2017.06.006

Citation:

XUE Wanyun, WU Shiqiang, WU Xiufeng, DAI Jiangyu, YANG Qianqian, WANG Fangfang. Sediment incipient motion on movable bed in rigid vegetation environment[J]. Advances in Water Science, 2017, 28(6): 849-857. doi: 10.14042/j.cnki.32.1309.2017.06.006

刚性植被区域床面泥沙起动特性

doi: 10.14042/j.cnki.32.1309.2017.06.006

1.
南京水利科学研究院, 江苏南京 210029;
2.
水文水资源与水利工程科学国家重点实验室, 江苏南京 210029

基金项目: 国家自然科学基金资助项目（51409165；51379128）

详细信息

作者简介:
薛万云(1986-),男,青海西宁人,高级工程师,主要从事水力学及河流动力学方面研究。E-mail:wyxue@nhri.cn

中图分类号: TV122

Sediment incipient motion on movable bed in rigid vegetation environment

1.
Nanjing Hydraulic Research Institute, Nanjing 210029, China;
2.
State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing 210029, China

Funds: The study is financially supported by the National Natural Science Foundation of China (No.51409165; No.51379128).

摘要: 为研究植被环境中床面泥沙起动特性，以天然河道中的植被及沙床为原型，对刚性植被环境中床面形态变化及泥沙起动规律进行了试验研究，并采用单位床面空间平均流速表述植被环境中泥沙的起动流速。研究结果表明，淹没植被条件下动床床面泥沙运动可分为3个阶段，即静止、部分起动及全部起动阶段，定义第3个阶段为刚性植被环境中泥沙起动的标准；推导的淹没刚性植被环境中的泥沙起动流速半经验函数关系式可以表述植被环境中泥沙起动特性，其中植被因子F_v对泥沙起动的影响最明显；植被密度一定时，植株周围冲坑深与空间平均流速成线性关系。研究认为采用植被环境中单位床面空间平均流速表述泥沙起动特性的方法是可行的。
- 试验 /
- 刚性植被 /
- 泥沙 /
- 起动流速 /
- 冲刷
Abstract: Vegetation in open channels has a significant influence on the characteristics of bed load movement. To date, studies of incipient motion of sediment in open channels with submerged vegetation have been restricted by limitations in statistical approaches and measuring equipment. Researchers have also neglected incipient motion of sediment in the presence of vegetation when deriving semi-empirical equations for the rates of bed load transport, and have generally considered it the same as that without vegetation, which is clearly inconsistent with, and does not represent, the actual conditions. In this study, we therefore studied the vegetation and sandy bed in a natural river to determine the characteristics of incipient motion of sediment within rigid vegetation on a movable bed. From the spatially averaged velocity, we then described the incipient motion of sediment under the water-vegetation interface. We found that there were three phases of incipient motion of sediment, namely static, partially in motion, and entirely in motion. We defined the incipient motion of sediment from the conditions for the third process. We derived a semi-empirical equation for the sediment incipient velocity in the presence of submerged vegetation from our experimental results, and found that, of the factors explored, the vegetation factor F_v had most influence on the incipient motion velocity of sediment with vegetation. For a given vegetation density, the average depth of the scour holes around the vegetation elements were linearly related with the spatially averaged velocity of the flow under the water-vegetation interface. These results demonstrate that our method gave reasonable estimates of the spatially averaged velocity for incipient motion of sediment.
- experiment /
- rigid vegetation /
- sediment /
- incipient velocity /
- scour

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刚性植被区域床面泥沙起动特性

doi: 10.14042/j.cnki.32.1309.2017.06.006

1. 南京水利科学研究院, 江苏南京 210029;

2. 水文水资源与水利工程科学国家重点实验室, 江苏南京 210029

基金项目: 国家自然科学基金资助项目（51409165；51379128）

作者简介:
薛万云(1986-),男,青海西宁人,高级工程师,主要从事水力学及河流动力学方面研究。E-mail:wyxue@nhri.cn

收稿日期: 2017-06-12
刊出日期: 2017-11-25

中图分类号: TV122

关键词:

试验 /

刚性植被 /

泥沙 /

起动流速 /

冲刷

摘要: 为研究植被环境中床面泥沙起动特性，以天然河道中的植被及沙床为原型，对刚性植被环境中床面形态变化及泥沙起动规律进行了试验研究，并采用单位床面空间平均流速表述植被环境中泥沙的起动流速。研究结果表明，淹没植被条件下动床床面泥沙运动可分为3个阶段，即静止、部分起动及全部起动阶段，定义第3个阶段为刚性植被环境中泥沙起动的标准；推导的淹没刚性植被环境中的泥沙起动流速半经验函数关系式可以表述植被环境中泥沙起动特性，其中植被因子F_v对泥沙起动的影响最明显；植被密度一定时，植株周围冲坑深与空间平均流速成线性关系。研究认为采用植被环境中单位床面空间平均流速表述泥沙起动特性的方法是可行的。

English Abstract

Sediment incipient motion on movable bed in rigid vegetation environment

1. Nanjing Hydraulic Research Institute, Nanjing 210029, China;

2. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing 210029, China

Funds: The study is financially supported by the National Natural Science Foundation of China (No.51409165; No.51379128).

Received Date: 2017-06-12
Publish Date: 2017-11-25

Keywords:

Abstract: Vegetation in open channels has a significant influence on the characteristics of bed load movement. To date, studies of incipient motion of sediment in open channels with submerged vegetation have been restricted by limitations in statistical approaches and measuring equipment. Researchers have also neglected incipient motion of sediment in the presence of vegetation when deriving semi-empirical equations for the rates of bed load transport, and have generally considered it the same as that without vegetation, which is clearly inconsistent with, and does not represent, the actual conditions. In this study, we therefore studied the vegetation and sandy bed in a natural river to determine the characteristics of incipient motion of sediment within rigid vegetation on a movable bed. From the spatially averaged velocity, we then described the incipient motion of sediment under the water-vegetation interface. We found that there were three phases of incipient motion of sediment, namely static, partially in motion, and entirely in motion. We defined the incipient motion of sediment from the conditions for the third process. We derived a semi-empirical equation for the sediment incipient velocity in the presence of submerged vegetation from our experimental results, and found that, of the factors explored, the vegetation factor F_v had most influence on the incipient motion velocity of sediment with vegetation. For a given vegetation density, the average depth of the scour holes around the vegetation elements were linearly related with the spatially averaged velocity of the flow under the water-vegetation interface. These results demonstrate that our method gave reasonable estimates of the spatially averaged velocity for incipient motion of sediment.

薛万云, 吴时强, 吴修锋, 戴江玉, 杨倩倩, 王芳芳. 刚性植被区域床面泥沙起动特性[J]. 水科学进展, 2017, 28(6): 849-857. doi: 10.14042/j.cnki.32.1309.2017.06.006

引用本文:

薛万云, 吴时强, 吴修锋, 戴江玉, 杨倩倩, 王芳芳. 刚性植被区域床面泥沙起动特性[J]. 水科学进展, 2017, 28(6): 849-857. doi: 10.14042/j.cnki.32.1309.2017.06.006

Citation:

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刚性植被区域床面泥沙起动特性

doi: 10.14042/j.cnki.32.1309.2017.06.006

作者简介: 薛万云(1986-),男,青海西宁人,高级工程师,主要从事水力学及河流动力学方面研究。E-mail:wyxue@nhri.cn

Sediment incipient motion on movable bed in rigid vegetation environment

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出版历程

刚性植被区域床面泥沙起动特性

doi: 10.14042/j.cnki.32.1309.2017.06.006

1. 南京水利科学研究院, 江苏 南京 210029; 2. 水文水资源与水利工程科学国家重点实验室, 江苏 南京 210029

作者简介: 薛万云(1986-),男,青海西宁人,高级工程师,主要从事水力学及河流动力学方面研究。E-mail:wyxue@nhri.cn

English Abstract

Sediment incipient motion on movable bed in rigid vegetation environment

1. Nanjing Hydraulic Research Institute, Nanjing 210029, China; 2. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing 210029, China

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作者简介:
薛万云(1986-),男,青海西宁人,高级工程师,主要从事水力学及河流动力学方面研究。E-mail:wyxue@nhri.cn

1. 南京水利科学研究院, 江苏南京 210029;

2. 水文水资源与水利工程科学国家重点实验室, 江苏南京 210029

作者简介:
薛万云(1986-),男,青海西宁人,高级工程师,主要从事水力学及河流动力学方面研究。E-mail:wyxue@nhri.cn

1. Nanjing Hydraulic Research Institute, Nanjing 210029, China;

2. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing 210029, China