Details
| Original language | English |
|---|---|
| Pages (from-to) | 68-83 |
| Number of pages | 16 |
| Journal | International Journal of Sediment Research |
| Volume | 33 |
| Issue number | 1 |
| Publication status | Published - 12 Jul 2017 |
Abstract
Physical model tests were done in a recirculating flume to investigate the overall erosion stability of widely graded bed material in estuarine and coastal conditions by means of simulating tidal flow conditions with reversing currents. As a result of the reversing flow conditions, previously protected sediment eventually became exposed again, leading to bidirectional displacement processes depending on the flow direction. Furthermore, eroded sediment fractions were slightly finer due to flow in the initially applied direction rather than under the subsequently applied flow in the reverse direction. This indicates higher critical shear stresses, and, thus, erosion stability for the initial flow direction. In comparison to the erosional pattern found when subjecting the material to unidirectional currents, this study finds an even higher erosional stability for sediment fractions smaller than the median (d50) diameter of the parent bed material under reversing current conditions. Overall, no significant damage or failure of the bed was observed after subjecting the material to reversing currents, indicating only a small amount of bed degradation, and, thus, high potential for scour and bed protection under the tested flow conditions.
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Geology
- Earth and Planetary Sciences(all)
- Stratigraphy
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In: International Journal of Sediment Research, Vol. 33, No. 1, 12.07.2017, p. 68-83.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Influence of reversing currents on the erosion stability and bed degradation of widely graded grain material
AU - Schendel, Alexander
AU - Goseberg, Nils
AU - Schlurmann, Torsten
N1 - Cited By :3 Export Date: 1 February 2021
PY - 2017/7/12
Y1 - 2017/7/12
N2 - Physical model tests were done in a recirculating flume to investigate the overall erosion stability of widely graded bed material in estuarine and coastal conditions by means of simulating tidal flow conditions with reversing currents. As a result of the reversing flow conditions, previously protected sediment eventually became exposed again, leading to bidirectional displacement processes depending on the flow direction. Furthermore, eroded sediment fractions were slightly finer due to flow in the initially applied direction rather than under the subsequently applied flow in the reverse direction. This indicates higher critical shear stresses, and, thus, erosion stability for the initial flow direction. In comparison to the erosional pattern found when subjecting the material to unidirectional currents, this study finds an even higher erosional stability for sediment fractions smaller than the median (d50) diameter of the parent bed material under reversing current conditions. Overall, no significant damage or failure of the bed was observed after subjecting the material to reversing currents, indicating only a small amount of bed degradation, and, thus, high potential for scour and bed protection under the tested flow conditions.
AB - Physical model tests were done in a recirculating flume to investigate the overall erosion stability of widely graded bed material in estuarine and coastal conditions by means of simulating tidal flow conditions with reversing currents. As a result of the reversing flow conditions, previously protected sediment eventually became exposed again, leading to bidirectional displacement processes depending on the flow direction. Furthermore, eroded sediment fractions were slightly finer due to flow in the initially applied direction rather than under the subsequently applied flow in the reverse direction. This indicates higher critical shear stresses, and, thus, erosion stability for the initial flow direction. In comparison to the erosional pattern found when subjecting the material to unidirectional currents, this study finds an even higher erosional stability for sediment fractions smaller than the median (d50) diameter of the parent bed material under reversing current conditions. Overall, no significant damage or failure of the bed was observed after subjecting the material to reversing currents, indicating only a small amount of bed degradation, and, thus, high potential for scour and bed protection under the tested flow conditions.
KW - Bed degradation
KW - Erosion stability
KW - Laboratory tests
KW - Reversing current
KW - Scour protection
KW - Widely graded bed material
KW - coastal protection
KW - coastal zone
KW - erosion control
KW - erosion rate
KW - erosivity
KW - estuarine environment
KW - flow field
KW - laboratory method
KW - scour
KW - shear stress
KW - stability analysis
UR - http://www.scopus.com/inward/record.url?scp=85026315807&partnerID=8YFLogxK
U2 - 10.1016/j.ijsrc.2017.07.002
DO - 10.1016/j.ijsrc.2017.07.002
M3 - Article
AN - SCOPUS:85026315807
VL - 33
SP - 68
EP - 83
JO - International Journal of Sediment Research
JF - International Journal of Sediment Research
SN - 1001-6279
IS - 1
ER -