STATISTICAL ANALYSIS OF BEDFORMS DEVELOPED UNDER UNIDIRECTIONAL FLOW
A set of developing dune experiments from a flattened sand bed has been obtained in a narrow 0.44-m-wide and 12-m-long glass-sided open channel. The sand in use is a coarse uniform sand of D50=0.85-mm. The chosen flow depths generated practically 2D dunes in flow direction over the length of the channel. Spatial sand-bed-elevation profiles have been recorded in the centreline of the flume over a distance of 6-m, roughly every 23-sec over the time of development. The statistical properties of a series of bed elevations are analysed with both a discrete and a continuous approach.Previous analysis showed that the continuous approach provides more objective results, but interpreting the results of the analysis requires careful consideration. In this paper, results from the comparison of bedform statistics with flume and flow characteristics under which the bedforms were developed, are presented. When comparing the statistical bedform properties with the ratio of flume width to flow depth, b/h, it is shown that a relationship exists for the available data. The input data for this study is limited, but the presented results show that more attention needs to be given to the flume environment, in which bedforms are developed. For this study dimensionless bedform properties vary up to 20%, displaying a correlation with flume width/flow depth ratio.
Sediment transport Bedform Dune Flume width Statistical analysis
Heide Friedrich
Department of Civil and Environmental Engineering, The University of Auckland, Auckland,New Zealand
国际会议
第16届亚太地区国际水利学大会暨第3届水工水力学国际研讨会(16th IAHR-APD Congress and 3rd Symoposium of IAHR-ISHS)
南京
英文
838-842
2008-10-20（万方平台首次上网日期，不代表论文的发表时间）