Journal
WATER RESEARCH
Volume 36, Issue 14, Pages 3439-3448Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0043-1354(02)00073-8
Keywords
irrigation; tile drainage; sediment transport; particle size; flocculation
Ask authors/readers for more resources
A field-scale no-till corn plot (120 m x 90 m) located on a tile drained silt loam soil near Kintore, Ontario was irrigated with 2.5 cm of water over a 3 h period to examine the effects of irrigation on tile sediment transport in a headwater stream. Flow characteristics and the composition, concentration and size distribution of suspended solids were measured at the tile outlet, an upstream reference site and three sites located downstream of the tile drain. Results show that tile sediments at the study site are fine-grained (D-50 approximate to 5.0mum) and consist primarily of quartz, anorthite/ albite, dolomite and calcite. Sediment concentrations in tile effluent increased from 8 to 57 mg L-1 after 1.5h of irrigation and reached a maximum of 72mgL(-1). The sediment yield from the tile drain for the irrigation event was 4.6kg ha(-1). An unsteady, mobile boundary flow model (MOBED) was used to predict flow characteristics in the stream. According to the MOBED model, bed shear stress in the stream was approximately 6 N m(-2). This value is significantly greater than the critical shear stress for complete suspension of 1 N m-2 for tile sediments as determined from laboratory experiments using a rotating circular flume. Grain size distributions of suspended solids in the stream,were close to the dispersed size distribution because of the high shear stress in the receiving stream. (C) 2002 Elsevier Science Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available