Sedimentology of Erect Vegetal Filters

by Ernest W. Tollner, Asst. Prof.; Agr. Engrg., Univ. of Georgia, Experiment, Ga.,
Billy J. Barfield, Prof.; Agr. Engrg., Univ. of Kentucky, Lexington, Ky.,
John C. Hayes, Asst. Prof.; Agr. and Biological Engrg., Mississippi State Univ., Mississippi State, Miss.,

Serial Information: Journal of the Hydraulics Division, 1982, Vol. 108, Issue 12, Pg. 1518-1531

Document Type: Journal Paper


In order to analyze sediment deposition in vegetated areas, it is necessary to develop relationships that define the steady-state sediment transport capacity of a given filter media. The development of these relationships was greatly facilitated by drawing an analogy between the flow in a narrow, deep channel and flow through closely spaced erect bodies. Based on the analogy, a dimensionless shear parameter is calculated using a spacing hydraulic radius as the characteristic length. Utilizing data collected with artificial media, this dimensionless shear is correlated to the bed load and total load parameters of Graf and Einstein with r² values ranging from 0.81 - 0.94. Neil's relationship was also analyzed and yielded a high r² value. Relationships based on the analogy were further examined by incorporating them into a model that predicted the sediment deposition wedge advance distance in actual vegetation. The agreement between the predicted and observed values was excellent. Thus, the sedimentology of grass filters presented herein is considered useful for design and research applications.

Subject Headings: Vegetation | Channel flow | Bed loads | Sediment | Filters | Sediment transport | Parameters (statistics) | Steady states

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