太湖水环境模型关键参数曼宁系数的水槽试验

马秋霞; 逄勇; 张鹏程

doi:10.13205/j.hjgc.202206035

太湖水环境模型关键参数曼宁系数的水槽试验

doi: 10.13205/j.hjgc.202206035

马秋霞^1,2,
逄勇^1,2, ,,
张鹏程^1,2

1. 河海大学环境学院, 南京 210098;
2. 河海大学浅水湖泊综合治理与资源开发教育部重点实验室, 南京 210098

基金项目:

国家自然科学基金项目(51879070,52000100)

详细信息

作者简介:
马秋霞(1995-),女,博士,主要研究方向为水环境数值模拟。maqiuxia@hhu.edu.cn

通讯作者:
逄勇(1958-),男,教授,主要研究方向为环境规划与评价、水环境数值模拟。ypang@hhu.edu.cn

计量
- 文章访问数: 162
- HTML全文浏览量: 22
- PDF下载量: 3
- 被引次数: 0
出版历程
- 收稿日期: 2021-10-11
- 网络出版日期: 2022-09-01
- 刊出日期: 2022-09-01

FLUME EXPERIMENT STUDY ON MANNING COEFFICIENT,A KEY PARAMETER OF WATER ENVIRONMENT MODEL OF THE TAIHU LAKE

MA Qiuxia^1,2,
PANG Yong^{1,2
, ,},
ZHANG Pengcheng^1,2

1. College of Environment, Hohai University, Nanjing 210098, China;
2. Key Laboratory of Integrated Regulation and Resources Development of Shallow Lakes, Ministry of Education, Hohai University, Nanjing 210098, China

摘要

摘要: 曼宁系数是在水流计算和实际工程中应用最广泛的水流阻力系数,是河湖阻力研究中的重要方向。基于室内循环水槽,利用三维声学多普勒流速仪,研究了不同沉水植株密度和水体流速下曼宁系数的变化特性。根据摩阻力相似原理、实际曼宁系数和试验曼宁系数换算公式,计算得到不同工况下的太湖曼宁系数;并通过回归拟合,得到太湖曼宁系数与植株密度、株高和水体流速的最优拟合方程式。结果表明:当湖底植株状况一定时,太湖曼宁系数与水体流速呈明显的单调递减幂函数关系;当植株密度 ≤ 200株/m²,水体流速和株高一定时,太湖曼宁系数与植株密度呈单调递增关系;当水体流速与植株密度一定时,太湖曼宁系数与植株株高呈单调递增关系。通过试验模拟得到太湖实际曼宁系数,对沉积物-水界面氮磷营养盐的迁移转化研究、富营养改善及湖泊长效管理具有重要意义。
- 曼宁系数 /
- 太湖 /
- 水槽 /
- 沉水植物
Abstract: Manning coefficient is the most widely used water flow resistance coefficient in water flow calculation and practical engineering,and it is an important direction in the research of river and lake resistance.Based on the indoor circulating flume,the variation characteristics of the Manning coefficient under different submerged plant densities and water flow rates were studied with a three-dimensional acoustic Doppler velocimeter.According to the similarity principle of friction resistance,the conversion formula of the actual equivalent and the experimental Manning coefficient values,the Manning coefficient of the Taihu Lake under different conditions were calculated.Through regression fitting,the optimal fitting equation of the Manning coefficients of the Taihu Lake with plant density,plant height and water velocity were obtained.The results showed that when the plants'condition at the bottom of the lake was constant,the Manning coefficient of the Taihu Lake and the water velocity presented an obvious monotonic decreasing power function.When the plant density was no more than 200 plants/m²,water velocity and plant height were constant,the Manning coefficient of the Taihu Lake increased slightly with the increase of plant density.In addition,when the water velocity and plant density were constant,the Manning coefficient of the Taihu Lake was monotonically increasing with plant height.The actual Manning coefficient of the Taihu Lake obtained through experiments was of great significance to the study of the migration and transformation of nitrogen and phosphorus nutrients at the sediment-water interface,the improvement of eutrophication,and the long-term management of the lake.
- Manning coefficient /
- the Taihu Lake /
- flume /
- submerged plant

HTML全文

参考文献(28)

[1]	马晓航,王文才,朱春申,等.沉水植物对河道曼宁系数影响的实验研究[J].水动力学研究与进展(A辑),2015, 30(1):106-111.
[2]	CAROLLO F G, FERRO V, TERMINI D. Flow resistance law in channels with flexible submerged vegetation[J]. Journal of Hydraulic Engineering,2005, 131(7):554-564.
[3]	徐卫刚.非均匀流条件下植被河道水力学特性与曼宁公式研究[D].北京:华北电力大学, 2013.
[4]	杜薇.浅水湖泊波流紊动特性及对沉积物运移驱动机制研究[D].南京:河海大学, 2017.
[5]	何贵平,谢艳,雷孝章.植被配置对坡面流阻力规律的影响分析[J].水电能源科学,2021, 39(6):25-28 ,54.
[6]	秦伯强,胡维平,陈伟民,等.太湖梅梁湾水动力及相关过程的研究[J].湖泊科学,2000(4):327-334,385.
[7]	张毅敏,张永春,张龙江,等.湖泊水动力对蓝藻生长的影响[J].中国环境科学,2007,27(5):707-711.
[8]	秦伯强,杨桂军,马健荣,等.太湖蓝藻水华"暴发"的动态特征及其机制[J].科学通报,2016, 61(7):759-770.
[9]	王谦谦,姜加虎,濮培民.太湖和大浦河口风成流、风涌水的数值模拟及其单站验证[J].湖泊科学,1992,4(4):1-7.
[10]	逄勇,濮培民.大气-水耦合模式下三维太湖湖流场研究[J].湖泊科学,1996,8(2):97-102.
[11]	李一平,逄勇,陈克森,等.水动力作用下太湖底泥起动规律研究[J].水科学进展,2004,15(6):770-774.
[12]	舒叶华,高晨晨.太湖风生流及污染物输移扩散数值模拟[J].水资源保护,2021, 37(2):121-127.
[13]	LI S L, SHI H R, XIONG Z W, et al. New formulation for the effective relative roughness height of open channel flows with submerged vegetation[J]. Advances in Water Resources,2015, 86:46-57.
[14]	CHENG Y, LI Y P, WANG Y N, et al. Uncertainty and sensitivity analysis of spatially distributed roughness to a hydrodynamic water quality model:a case study on Lake Taihu, China[J/OL]. Environmental Science and Pollution Research. https://doi.org/10.1007/s11356-021-16623-2.
[15]	闫静,王晓丽,陈红,等.淹没植物条件下明渠KH涡的垂向几何尺度和频率[J].水科学进展,2021, 32(5):770-779.
[16]	赵振兴,何建京.水力学[M].北京:清华大学出版社, 2013.
[17]	蒋胡玲.堆积体河道紊流特性及摩阻特性研究[D].成都:西华大学, 2020.
[18]	王健健.风驱动下太湖底泥再悬浮规律及对水环境影响研究[D].南京:河海大学, 2015.
[19]	李艳红,赵敏.含植物河流动力学实验研究:流速、摩阻流速及曼宁糙率系数垂线分布[J].水动力学研究与进展(A辑),2004,19(4):513-519.
[20]	郑爽,吴一红,白音包力皋,等.含水生植物河道曼宁糙率系数的试验研究[J].水利学报,2017, 48(7):874-881.
[21]	顾峰峰.芦苇阻力系数物模及湿地水流数模研究[D].大连:大连理工大学, 2006.
[22]	王华,陈华鑫,徐兆安,等. 2010-2017年太湖总磷浓度变化趋势分析及成因探讨[J].湖泊科学,2019, 31(4):919-929.
[23]	徐德瑞,周杰,张建华,等.东太湖沉水植物现状及影响因子分析[J].水电能源科学,2020, 38(4):64-67 ,94.
[24]	张英豪,赖锡军,张琳,等.风浪作用下水生植物对水流结构的影响:以太湖中两种典型沉水植物为例[J].水科学进展,2020, 31(3):441-449.
[25]	黄雯雯.摩阻流速与垂线平均流速的关系探讨[J].科技资讯,2020, 18(16):56-58.
[26]	高月香,张毅敏,张永春.流速对太湖底泥污染物释放的影响[J].环境工程,2014, 32(8):10-14.
[27]	ABDOLAHPOUR M, HAMBLETON M, GHISALBERTI M. The wave-driven current in coastal canopies[J]. Journal of Geophysical Research-Oceans,2017, 122(5):3660-3674.
[28]	洪晓瑜.太湖水环境数学模型建立及排污总量控制研究[D].南京:河海大学, 2005.