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Effectiveness of Dichanthium annulatum in Watercourses for Reducing Sediment Delivery from Agricultural Watersheds

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Title Effectiveness of Dichanthium annulatum in Watercourses for Reducing Sediment Delivery from Agricultural Watersheds
Not Available
 
Creator Battu Krishna Rao
Prasanta K. Mishra
Ravi S. Kurothe
Vinod C.Pande
Gopal Kumar
 
Subject Froude number; Grass filter; Manning’s coefficient; Sediment concentration
 
Description Not Available
A field experiment was conducted to determine the efficacy of Dichantium annulatum
grass filters in watercourses and to optimize the grass coverage in these watercourses.
This experiment was conducted in 2% slope watercourses with varying filter grass
coverage (0, 25, 50, 75, 100%) as main treatments and different flow rates (5, 10, 15,
20 L/s) as sub-treatments. The inflow and outflow, flow velocity, depth of the flow, and
sediment concentration was measured and analyzed for each run. The experimental
results reveal that the grass filter strips are able to reduce the sediment concentration
in the runoff water by six times (from 4.2 to 0.65 g/L). The filter strips are able to
reduce the velocity of the runoff water by two times (from 1.06 to 0.47 m/s) and
convert the supercritical flows into subcritical flows. The filter strips are able to
increase the Manning’s coefficient from 0.0323 to 0.1006 under various discharges.
From the experiment, it can be concluded that more than 50% grass filter coverage in
watercourses did not further reduce sediment concentration, outflow, flow velocity,
and the Froude number and increase roughness of the channels. Based on these
results, it is recommended that D. annulatum can be used as a filter in watercourses to
prevent runoff and soil losses from crop fields and thereby reducing the
sedimentation of downstream water bodies. The optimum grass coverage, i.e. 50%
of the channel length, can maintain the maximum grass production with minimum
soil loss.
Not Available
 
Date 2020-05-27T09:01:18Z
2020-05-27T09:01:18Z
2014-08-09
 
Type Research Paper
 
Identifier Not Available
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/36415
 
Language English
 
Relation Not Available;
 
Publisher Not Available