SWASH ZONE BED LEVEL CHANGES AND SEDIMENT ENTRAINMENT AT THE SURF-SWASH BOUNDARY

TY - ABST

T1 - SWASH ZONE BED LEVEL CHANGES AND SEDIMENT ENTRAINMENT AT THE SURF-SWASH BOUNDARY

AU - Jensen, Stine Gro

AU - Aagaard, Troels

AU - Baldock, Tom

N1 - Conference code: 32

PY - 2010

Y1 - 2010

N2 - In the process of estimating the effect of sediment advection into the swash zone from bore collapse, a method in which buried self-logging pressure transducers are used to measure bed level changes in the swash zone, over a timeframe of several hours to inter-swash level, has been tested against bed level changes obtained from rod measurements. The test shows perfect agreement in the upper and mid swash while minor disagreement (1 cm) in the lower swash occurred. The deployment of self-logging pressure transducers has proven to be an accurate, easy and flexible method to obtain highly detailed data on water levels and bed elevations in the swash zone. Water levels derived from the pressure transducers show that swash zone characteristics vary from the upper to lower swash. Using pressure transducers in the swash zone coupled with measurements of the hydrodynamics and sediment concentrations at the outer boundary of the swash zone will improve the ability to explain the role of sediment advection from bore collapse. In relation to this, a method which consistently identify bores at the surf-swash boundary and quantifies thesuspended sediment load carried by such bores prior to their collapse and run-up in the swash zone, is also presented.

AB - In the process of estimating the effect of sediment advection into the swash zone from bore collapse, a method in which buried self-logging pressure transducers are used to measure bed level changes in the swash zone, over a timeframe of several hours to inter-swash level, has been tested against bed level changes obtained from rod measurements. The test shows perfect agreement in the upper and mid swash while minor disagreement (1 cm) in the lower swash occurred. The deployment of self-logging pressure transducers has proven to be an accurate, easy and flexible method to obtain highly detailed data on water levels and bed elevations in the swash zone. Water levels derived from the pressure transducers show that swash zone characteristics vary from the upper to lower swash. Using pressure transducers in the swash zone coupled with measurements of the hydrodynamics and sediment concentrations at the outer boundary of the swash zone will improve the ability to explain the role of sediment advection from bore collapse. In relation to this, a method which consistently identify bores at the surf-swash boundary and quantifies thesuspended sediment load carried by such bores prior to their collapse and run-up in the swash zone, is also presented.

KW - Faculty of Science

KW - opskylszonen

KW - swash zone

KW - surf-swash boundary

KW - bed level changes

M3 - Conference abstract in proceedings

T3 - Proceedings of the International Conference on Coastal Engineering

BT - Proceedings of 32nd Conference on Coastal Engineering, Shanghai, China, 2010.

A2 - McKee, Jane Smith

A2 - Lynett, Patrick

T2 - The 32nd International Conference on Coastal Engineering (ICCE 2010)

Y2 - 30 June 2010 through 5 July 2010

ER -