|Lei, Tingwu - P. R. CHINA|
Submitted to: International Soil Conservation Organization Conference Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: May 23, 1999
Publication Date: N/A
Technical Abstract: A series of flume experiments were conducted to understand shallow water hydraulics, erosion in rills as well as morphological patterns of a rill as affected by rill bed slopes and inflow rates. The soil used was Cecil soil, a sandy loamy soil. Four flow rates, 1, 2, 3 and 4 gallons per minute and 4 slopes, 1%, 3%, 5% and 7% were adopted in the experiments. The velocities, rill widths and sediment concentrations at the outlet were recorded and analyzed with multivariable regression method as functions of slopes, inflow rate and/or their interactive terms. Rill widths changing along the rill with certain periodical patterns were visually observed. A mathematical model is advanced to describe these changing patterns of rill width.