淹没柔性植被河道阻力系数特性及计算方法研究

赵汗青; 王伟杰; 赵彦芳; 冯达骞; 李今今; 徐宇轩

淹没柔性植被河道阻力系数特性及计算方法研究

赵汗青^1,2,
王伟杰^3,,
赵彦芳^3,4,
冯达骞^3,4,
李今今³,
徐宇轩^3,5

1. 中国长江三峡集团有限公司,科学技术研究院;
2. 水资源高效利用与工程安全国家工程研究中心;
3. 中国水利水电科学研究院,流域水循环模拟与调控国家重点实验室;
4. 河北工程大学水利学院;
5. 华北水利水电大学水利学院

基金项目:

国家自然科学基金项目(52209083)

国家自然科学基金项目(51809286)

中国长江三峡集团有限公司科研项目(202103399)

中国水利水电科学研究院“五大人才”项目(WE0199A052021)

详细信息

作者简介:
赵汗青(1991-),男,博士,研究方向为环境生态水力学与泥沙动力学。E-mail:zhao_hanqing@ctg.com.cn

通讯作者:
王伟杰(1988-),男,高级工程师,博士,研究方向为流域水环境机理、模拟与调控。E-mail:wjwang@whu.edu.cn

中图分类号: TV133
计量
- 文章访问数: 0
- HTML全文浏览量: 0
- PDF下载量: 0
出版历程
- 收稿日期: 2022-08-07

Research on the Characteristics and Calculation Method of Resistance Coefficient of Submerged Flexible Vegetated River Channel

1. Institute of Science and Technology,China Three Gorges Corporation;
2. National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety;
3. State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin,China Institute of Water Resources and Hydropower Research;
4. College of Water Resources,Hebei Engineering University;
5. College of Water Resources,North China University of Water Resources and Hydropower

摘要

摘要: 植被是河流生态系统中重要的组成部分，在河流生态修复、河道形态演变和水资源可持续利用中发挥重要的作用，但水生植被的存在也会改变河道水流的运动形态，降低水流流速。柔性植被在水流的作用下会产生形态变化，使水流运动更加复杂。将柔性植被的形变因素加入到经典达西-魏斯巴赫阻力方程，利用最大差异性算法对试验数据进行筛选分类，通过遗传算法确定出淹没柔性植被阻力系数的表达式，基于达西-魏斯巴赫阻力系数与曼宁系数的转换关系得出曼宁系数表达式。结果表明：提出的达西-魏斯巴赫阻力系数公式和曼宁系数公式具有相对简明的表达形式，能应用于不同水深、不同植被密度、不同植被高度等条件下的淹没柔性植被河道阻力系数计算，研究成果可为植被化生态河道设计提供理论依据。
- 柔性植被 /
- 明渠流动 /
- 阻力系数 /
- 最大差异性算法 /
- 遗传算法
Abstract: Vegetation is an important part of the river ecosystem, which plays an important role in river ecological restoration, river morphology evolution and sustainable utilization of water resources. However, the existence of aquatic vegetation will also change the flow pattern and reduce the flow velocity. Flexible vegetation present certain oscillation and deformation under the action of water flow, which makes the water movement more complicated. In this paper, the deformation of the flexible vegetation is considered in the classical Darcy-Weisbach equation, and the vegetation properties that affect the resistance coefficient are analyzed. The maximum difference algorithm is used to screen and classify the experimental data, and then the genetic algorithm is used to determine the expression of the resistance coefficient of the submerged flexible vegetation. At the same time, the formula of Manning coefficient is derived by the relationship between the Darcy-Weisbach coefficient and the Manning coefficient.The results show that the friction formulae of Darcy-Weisbach and Manning have relatively concise expressions and can be applied to the calculation of the resistance coefficient of submerged flexible vegetation under different water depths, different vegetation densities and different vegetation heights. The research results can provide a theoretical basis for the design of vegetated ecological channel.
- flexible vegetation /
- open channel flow /
- resistance factor /
- maximum variability algorithm /
- genetic algorithm

HTML全文

参考文献(16)

[1]	WANG W J, HUAI W X, LI S, et al. Analytical solutions of velocity profile in flow through submerged vegetation with variable frontal width[J]. Journal of Hydrology, 2019,578:124 088.
[2]	WANG W J, HUAI W X, THOMPSON S, et al. Steady nonuniform shallow flow within emergent vegetation[J]. Water Resources Research, 2015,51(12):10 047-10 064.
[3]	OKAMOTO T, NEZU I. Spatial evolution of coherent motions in finite-length vegetation patch flow[J]. Environmental Fluid Mechanics, 2013,13(5):417-434.
[4]	YANG W, CHOI S U. A two-layer approach for depth-limited openchannel flows with submerged vegetation[J]. Journal of Hydraulic Research, 2010,48(4):466-475.
[5]	WANG P, WANG C, ZHU D Z. Hydraulic resistance of submerged vegetation related to effective height[J]. Journal of Hydrodynamics,2010,22(2):265-273.
[6]	WANG W J, PENG W Q, HUAI W X, et al. Friction factor for turbulent open channel flow covered by vegetation[J]. Scientific Reports,2019,9(1):1-16.
[7]	WANG W J, PENG W Q, HUAI W X, et al. Derivation of canopy resistance in turbulent flow from first-order closure models[J]. Water,2018,10(12):1 782.
[8]	CAMUS P, MENDEZ F J, MEDINA R, et al. Analysis of clustering and selection algorithms for the study of multivariate wave climate[J]. Coastal Engineering, 2011,58(6):453-462.
[9]	王宇飞.天然河道纵向离散系数研究[D].武汉:武汉大学,2017. WANG Y F. Study on the longitudinal dispersion coefficients in natural rivers[D].Wuhan:Wuhan University,2017.
[10]	贾凤聪,王伟杰,张晶,等.明渠水流淹没植被阻力系数计算公式研究[J].水电能源科学,2022,40(3):132-135. JIA F C,WANG W J,ZHANG J,et al. Research on formula for calculating resistance coefficient of submerged vegetation in open channel flow[J]. Water Resources and Power, 2022,40(3):132-135.
[11]	DUNN C, LOPEZ F, GARCIA M H. Mean flow and turbulence in a laboratory channel with simulated vegatation(hes 51)[R]. 1996.
[12]	YANG W, CHOI S U. Mean and turbulence structures of openchannel flows with submerged vegetation[M]//Advances in Water Resources and Hydraulic Engineering. Springer, Berlin, Heidelberg, 2009:429-434.
[13]	KUBRAK E, KUBRAK J, ROWIŃSKI P M. Vertical velocity distributions through and above submerged, flexible vegetation[J].Hydrological Sciences Journal, 2008,53(4):905-920.
[14]	OKAMOTO T, NEZU I. Flow resistance law in open-channel flows with rigid and flexible vegetation[J]. River Flow 2010:261-268.
[15]	JÄRVELÄJ. Effect of submerged flexible vegetation on flow structure and resistance[J]. Journal of Hydrology, 2005,307(1-4):233-241.
[16]	CAROLLO F G, FERRO V, TERMINI D. Flow velocity measurements in vegetated channels[J]. Journal of Hydraulic Engineering,2002,128(7):664-673.