| PREDICTION OF THE GRAIN SIZE OF SUSPENDED SEDIMENT： IMPLICATIONS FOR CALCULATING SUSPENDED SEDIMENT CONCENTRATIONS USING SINGLE FREQUENCY ACOUSTIC BACKSCATTER |
| |
| 作者姓名： | R. A. KUHNLE D. G. WREN J. P. CHAMBERS |
| |
| 作者单位： | Dr.Research Hydraulic Engineer National Sedimentation Laboratory U. S. Department of Agriculture Agricultural Research Service Oxford Mississippi 38655 USA，Dr.Research Hydraulic Engineer National Sedimentation Laboratory U. S. Department of Agriculture Agricultural Research Service Oxford Mississippi 38655 USA，Senior Research Scientist National Center for Physical Acoustics University of Mississippi University Mississippi 38677 USA |
| |
| 摘 要： | Collection of samples of suspended sediment transported by streams and rivers is difficult and expensive. Emerging technologies, such as acoustic backscatter, have promise to decrease costs and allow more thorough sampling of transported sediment in streams and rivers. Acoustic backscatter information may be used to calculate the concentration of suspended sand-sized sediment given the vertical distribution of sediment size. Therefore, procedures to accurately compute suspended sediment size distributions from easily obtained river data are badly needed. In this study, techniques to predict the size of suspended sand are examined and their application to measuring concentrations using acoustic backscatter data are explored. Three methods to predict the size of sediment in suspension using bed sediment, flow criteria, and a modified form of the Rouse equation yielded mean suspended sediment sizes that differed from means of measured data by 7 to 50 percent. When one sample near the bed was used as a reference, mean error was reduced to about 5 percent. These errors in size determination translate into errors of 7 to 156 percent in the prediction of sediment concentration using backscatter data from 1 MHz single frequency acoustics.
|
| 关 键 词： | 悬浮沉积物 粒度大小 预测 浓度计算 单频声散射 |
| 收稿时间： | 2005-12 |
| 修稿时间： | 2006-08 |
PREDICTION OF THE GRAIN SIZE OF SUSPENDED SEDIMENT: IMPLICATIONS FOR CALCULATING SUSPENDED SEDIMENT CONCENTRATIONS USING SINGLE FREQUENCY ACOUSTIC BACKSCATTER |
| |
| R. A. KUHNLE D. G. WREN J. P. CHAMBERS.PREDICTION OF THE GRAIN SIZE OF SUSPENDED SEDIMENT: IMPLICATIONS FOR CALCULATING SUSPENDED SEDIMENT CONCENTRATIONS USING SINGLE FREQUENCY ACOUSTIC BACKSCATTER[J].International Journal of Sediment Research,2007,22(1):1-15. |
| |
| Authors: | R A KUHNLE D G WREN J P CHAMBERS |
| |
| Abstract: | Collection of samples of suspended sediment transported by streams and rivers is difficult and expensive. Emerging technologies, such as acoustic backscatter, have promise to decrease costs and allow more thorough sampling of transported sediment in streams and rivers. Acoustic backscatter information may be used to calculate the concentration of suspended sand-sized sediment given the vertical distribution of sediment size. Therefore, procedures to accurately compute suspended sediment size distributions from easily obtained river data are badly needed. In this study, techniques to predict the size of suspended sand are examined and their application to measuring concentrations using acoustic backscatter data are explored. Three methods to predict the size of sediment in suspension using bed sediment, flow criteria, and a modified form of the Rouse equation yielded mean suspended sediment sizes that differed from means of measured data by 7 to 50 percent. When one sample near the bed was used as a reference, mean error was reduced to about 5 percent. These errors in size determination translate into errors of 7 to 156 percent in the prediction of sediment concentration using backscatter data from 1 MHz single frequency acoustics. |
| |
| Keywords: | Suspended sediment Grain size Acoustic backscatter Concentration errors |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
