| Abstract: | Cohesive sediment deposits characterized by a high fraction of mud (silt plus clay) significantly affect the morphology and ecosystem of rivers. Potentially cohesive sediment samples were collected from deposits in the Colorado River in Marble and Grand Canyons. The erosion velocities of these samples were measured in a laboratory flume under varying boundary shear stresses. The non-dimensional boundary shear stress at which erosion commenced showed a systematic deviation from that of non-cohesive sediments at mud fractions greater than 0.2. An empirical relation for the boundary shear stress threshold of erosion as a function of mud fraction was proposed. The mass erosion rate was modelled using the Ariathurai-Partheniades equation. The erosion rate parameter of this equation was found to be a strong function of mud fraction. Under similar boundary shear stress and sediment supply conditions in the Colorado River, cohesive lateral eddy deposits formed of mud fractions in excess of 0.2 will erode less rapidly than non-cohesive deposits. Copyright ?? 2008 John Wiley & Sons, Ltd. |
| Genre: | Article |
| ProdID: | 70033172 |
| Citation Author: | Akahori, R.; Schmeeckle, M. W.; Topping, D. J.; Melis, T. S. |
| Citation Contributing Office: | |
| Citation Datum: | |
| Citation Day: | |
| Citation Edition: | |
| Citation Editor: | |
| Citation End Page: | 1174 |
| Citation Issue: | 8 |
| Citation Keywords: | |
| Citation Language: | English |
| Citation Larger Work Title: | River Research and Applications |
| Citation LatN: | |
| Citation LatS: | |
| Citation LonE: | |
| Citation LonW: | |
| Citation Month: | |
| Citation No Pagination: | |
| Citation Number Of Pages: | 15 |
| Citation Online Only Flag: | |
| Citation Phsyical Description: | |
| Citation Projection: | |
| Citation Public Comments: | |
| Citation Publisher: | |
| Citation Series: | |
| Citation Series Code: | |
| Citation Series Number: | |
| Citation Search Results Text: | Erosion properties of cohesive sediments in the Colorado River in Grand Canyon; 2008; Article; Journal; River Research and Applications; Akahori, R.; Schmeeckle, M. W.; Topping, D. J.; Melis, T. S. |
| Citation Start Page: | 1160 |
| Citation Volume: | 24 |
| Citation Year: | 2008 |
| Type: | citation/reference |
| Text: | Erosion properties of cohesive sediments in the Colorado River in Grand Canyon; 2008; Article; Journal; River Research and Applications; Akahori, R.; Schmeeckle, M. W.; Topping, D. J.; Melis, T. S. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1002/rra.1122 |
| Date Other: | Tue, 1 Jan 2008 00:00 -0600 |
| Publisher: | |
