Experimental Study of Erosion Threshold Shear Stress of Deposited Cohesive Sediments with Different Self-Weight Consolidation
Cohesive sediments are gradually consolidated after settling in dam reservoirs, settling ponds and channels. For hydraulic flushing of the sediments it’s necessary that the erosion threshold velocity and shear stress of these types of sediments to be known. In this study, by using the annular flume...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | fas |
| Published: |
Shahid Chamran University of Ahvaz
2014-10-01
|
| Series: | علوم و مهندسی آبیاری |
| Subjects: | |
| Online Access: | http://jise.scu.ac.ir/article_10937_66696a1fe441b892f819369f1735ebdb.pdf |
| _version_ | 1828774801244684288 |
|---|---|
| author | Hossein Samadiborojeni Nima Akbari Behzad Ghorbani |
| author_facet | Hossein Samadiborojeni Nima Akbari Behzad Ghorbani |
| author_sort | Hossein Samadiborojeni |
| collection | DOAJ |
| description | Cohesive sediments are gradually consolidated after settling in dam reservoirs, settling ponds and channels. For hydraulic flushing of the sediments it’s necessary that the erosion threshold velocity and shear stress of these types of sediments to be known. In this study, by using the annular flume in Shahrekord University, this subject was investigated. Fine sediments used in the experiments, were collected from the reservoir bed of Pirbaloot earthfill dam located in north Karun basin, in Chaharmahal and Bakhtiari province. By conducting physicochemical tests the sediments properties were obtained. Five experiments to determine the erosion threshold of cohesive sediments with consolidation of five weeks, three weeks, two weeks, one week and three days was performed and velocity and shear stress of erosion threshold of sediments was measured by the ADV velocimeter. Results showed that erosion threshold of these sediments have a logarithmic relationship with the sediment consolidation time. The amount of erosion threshold shear stress of sediments for surface sediments were obtained in a range of 0.12 to 0.14 N/m<sup>2</sup> for sediment with difference age of self-weight consolidation. These values for subsurface sediments were obtained at 0.44 and 0.69 N/m<sup>2</sup>, respectively. |
| first_indexed | 2024-12-11T15:27:37Z |
| format | Article |
| id | doaj.art-198c2b32c0e64fb28d9478d34316d949 |
| institution | Directory Open Access Journal |
| issn | 2588-5952 2588-5960 |
| language | fas |
| last_indexed | 2024-12-11T15:27:37Z |
| publishDate | 2014-10-01 |
| publisher | Shahid Chamran University of Ahvaz |
| record_format | Article |
| series | علوم و مهندسی آبیاری |
| spelling | doaj.art-198c2b32c0e64fb28d9478d34316d9492022-12-22T01:00:09ZfasShahid Chamran University of Ahvazعلوم و مهندسی آبیاری2588-59522588-59602014-10-0137311110937Experimental Study of Erosion Threshold Shear Stress of Deposited Cohesive Sediments with Different Self-Weight ConsolidationHossein Samadiborojeni0Nima Akbari1Behzad Ghorbani2دانشگاه شهرکرددانشگاه شهرکرددانشگاه شهرکردCohesive sediments are gradually consolidated after settling in dam reservoirs, settling ponds and channels. For hydraulic flushing of the sediments it’s necessary that the erosion threshold velocity and shear stress of these types of sediments to be known. In this study, by using the annular flume in Shahrekord University, this subject was investigated. Fine sediments used in the experiments, were collected from the reservoir bed of Pirbaloot earthfill dam located in north Karun basin, in Chaharmahal and Bakhtiari province. By conducting physicochemical tests the sediments properties were obtained. Five experiments to determine the erosion threshold of cohesive sediments with consolidation of five weeks, three weeks, two weeks, one week and three days was performed and velocity and shear stress of erosion threshold of sediments was measured by the ADV velocimeter. Results showed that erosion threshold of these sediments have a logarithmic relationship with the sediment consolidation time. The amount of erosion threshold shear stress of sediments for surface sediments were obtained in a range of 0.12 to 0.14 N/m<sup>2</sup> for sediment with difference age of self-weight consolidation. These values for subsurface sediments were obtained at 0.44 and 0.69 N/m<sup>2</sup>, respectively.http://jise.scu.ac.ir/article_10937_66696a1fe441b892f819369f1735ebdb.pdfcohesive sedimentsannular flumeerosion thresholdadv velocimeter |
| spellingShingle | Hossein Samadiborojeni Nima Akbari Behzad Ghorbani Experimental Study of Erosion Threshold Shear Stress of Deposited Cohesive Sediments with Different Self-Weight Consolidation علوم و مهندسی آبیاری cohesive sediments annular flume erosion threshold adv velocimeter |
| title | Experimental Study of Erosion Threshold Shear Stress of Deposited Cohesive Sediments with Different Self-Weight Consolidation |
| title_full | Experimental Study of Erosion Threshold Shear Stress of Deposited Cohesive Sediments with Different Self-Weight Consolidation |
| title_fullStr | Experimental Study of Erosion Threshold Shear Stress of Deposited Cohesive Sediments with Different Self-Weight Consolidation |
| title_full_unstemmed | Experimental Study of Erosion Threshold Shear Stress of Deposited Cohesive Sediments with Different Self-Weight Consolidation |
| title_short | Experimental Study of Erosion Threshold Shear Stress of Deposited Cohesive Sediments with Different Self-Weight Consolidation |
| title_sort | experimental study of erosion threshold shear stress of deposited cohesive sediments with different self weight consolidation |
| topic | cohesive sediments annular flume erosion threshold adv velocimeter |
| url | http://jise.scu.ac.ir/article_10937_66696a1fe441b892f819369f1735ebdb.pdf |
| work_keys_str_mv | AT hosseinsamadiborojeni experimentalstudyoferosionthresholdshearstressofdepositedcohesivesedimentswithdifferentselfweightconsolidation AT nimaakbari experimentalstudyoferosionthresholdshearstressofdepositedcohesivesedimentswithdifferentselfweightconsolidation AT behzadghorbani experimentalstudyoferosionthresholdshearstressofdepositedcohesivesedimentswithdifferentselfweightconsolidation |