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| Publication Type:
| Report |
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| Author(s): | Dudley, Syndi J.;
Abt, Steven R.;
Bonham, Charles D.;
Fischenich, J. Craig |
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| Author Affiliation: | Dudley: Resident Assistant; and Abt: Professor, Department of Civil Engineering, Colorado State University, Ft. Collins, CO; and Bonham: Professor, Department of Statistical Ecology, Colorado State University, Ft. Collins, CO; and Fischenich: Resident Civil Engineer, U.S.A.E. Waterways Experimental Station, Vicksburg, MS |
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| Title: | Determining vegetation density and its impact on channel capacity |
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| Column Name: | Research and development
Other records with the "Research and development" Column
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| Section: | Technical papers
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| Meeting Info.: | Nashville, TN: February 25-28, 1997 |
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| Source: | International Erosion Control Association Proceedings 28:Erosion Control and the Environment...Working in Harmony. February 1997, p. 351-361. |
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| Publishing Information: | Steamboat Springs, CO: International Erosion Control Association |
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| # of Pages: | 11 |
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| Keywords: | TIC Keywords: Planting; Density; Channels; Measurement; Restoration
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| Abstract/Contents: | "The traditional concepts of flood conveyance through an engineered, reveted, channelized stream system have transformed to a concept of stream restoration, rehabilitation, and/or ecologic enhancement. Riparian vegetation, once the curse of the flood conveyance channel, has become the stabilization technique of choice in many communities. However, the impact of vegetation on channel conveyance must be evaluated. Several methods exist for estimating resistance to flow in vegetated channels, but little guidance is available to directly ascertain vegetation density or how it impacts channel capacity and stability. A cooperative study betwwen the U.S. Army Corps of Engineers and Colorado State University was conducted to develop a technique to utilize a horizontal point frame to estimate the vegetation density in channels or flood plains. The vegetative density measurement becomes a direct input variable to determining the channel resistance to flow. A field study was performed in a vegetated channel located near Stillwater, Oklahoma. The channel was characterized for geometry, slope, and vegetative density. A series of nine flows was conveyed through the channel and velocity and depth measurements were obtained. The variables of vegetative density, coefficient of drag for grasses (drag for woody vegetation has not yet been developed), and the hydraulic radius, were input into the Fischenich equation and the predicted Manning's n was determined. The measured Manning's n was determined from the measured hydraulic characteristics. The measured and predicted n values were compared. The predicted n values underestimated measured n values by 28% to 53%. The major differences are attributed to the coefficient of drag. The development of the horizontal point frame and the resistance to flow prediction technique appears to have merit for further development." |
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| Language: | English |
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| References: | 14 |
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| Note: | Pictures, b/w
Figures
Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Dudley, S. J., S. R. Abt, C. D. Bonham, and J. C. Fischenich. 1997. Determining vegetation density and its impact on channel capacity. Int. Erosion Control Assoc. Proc. p. 351-361. |
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MSU catalog number: S 622.2 .I58 1997 |
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