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

MA Qiuxia; PANG Yong; ZHANG Pengcheng

doi:10.13205/j.hjgc.202206035

Volume 40 Issue 6

Sep. 2022

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MA Qiuxia, PANG Yong, ZHANG Pengcheng. FLUME EXPERIMENT STUDY ON MANNING COEFFICIENT,A KEY PARAMETER OF WATER ENVIRONMENT MODEL OF THE TAIHU LAKE[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(6): 280-285. doi: 10.13205/j.hjgc.202206035

Citation:

MA Qiuxia, PANG Yong, ZHANG Pengcheng. FLUME EXPERIMENT STUDY ON MANNING COEFFICIENT,A KEY PARAMETER OF WATER ENVIRONMENT MODEL OF THE TAIHU LAKE[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(6): 280-285. doi: 10.13205/j.hjgc.202206035

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

doi: 10.13205/j.hjgc.202206035

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

Received Date: 2021-10-11
Available Online: 2022-09-01
Publish Date: 2022-09-01

Abstract

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

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References(28)

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