Longitudinal Velocity Distribution and Manning's 'n' Coefficient in Open Channel with Unsubmerged Vegetation

Wen Pei Huang; Hua Yong Zhang; Wei Gang Xu; Zhong Yu Wang

doi:10.4028/www.scientific.net/AMR.599.716

Paper Titles

Chemistry of Groundwater from Sandstone Aquifer in Wolonghu Coal Mine, Northern Anhui Province, China
p.697

Water Demand Forecasting in Hubei Province with BP Neural Network Model
p.701

The Research on the Lake Eutrophication with CNOP Method
p.705

Study on the Effect of Debris Flows from Guanba River on Qiong Lake, Sichuan, China
p.709

Longitudinal Velocity Distribution and Manning's 'n' Coefficient in Open Channel with Unsubmerged Vegetation
p.716

Parameter Inversion of Field Pumping Test in Aquifer with Enclosed Impermeable Boundary
p.720

Analysis of Groundwater Isotopes and Ions Characteristics Relationship in the Area of Seawater Intrusion
p.724

Study on the Flood Volume Investigation for Medium and Small River
p.728

Failure Mode of Karst Water under Inclined Coal Seam Mining in Hilly Area
p.732

HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 599Longitudinal Velocity Distribution and Manning's...

Longitudinal Velocity Distribution and Manning's 'n' Coefficient in Open Channel with Unsubmerged Vegetation

Abstract:

The effects of unsubmerged vegetation on velocity distribution and Manning’s n were investigated experimentally in the laboratory. Water level was measured by water level measurement system and velocity was measured by 3D acoustic Doppler velocimeters (ADV). The findings reveal that longitudinal velocity all has a minimum value at the location of 5m (longitudinal position) and the discharge of 70L/s, the minimum longitudinal velocity is 47cm/s, 44cm/s, 37cm/s and 35cm/s for 1m, 2m, 3m and 4m vegetation section length respectively. Based on the experimental data, the Manning’s n for various flow conditions as well as for vegetation patterns was determined. The Manning’s n varies between 0.04 and 0.09 in this study, and it decreases as the Froude number increases, while increases as the water depth increases. The effect of the vegetation section length on the relationship between the Manning’s n and Froude number is not significant.