Variability of suspended sand concentrations, transport and eddy diffusivity under non-breaking waves on the shoreface

Field measurement of the erosion threshold of silty seabed in the intertidal flat of the Yellow River Delta with a newly-developed annular flume

“…Typical values are generally taken to be 5E-05 kg m -2 s -1 (Mulder and Udink, 1991). Previous studies have reported erosion constants ranging from E-05 to E-04 (Green and Black, 1999), 1.5E-05 to 3E-04 (Drake and Cacchione, 1989;Vincent and Downing, 1994;Guilleń et al, 2002), with higher and lower values also reported (e.g., Wiberg and Dungan Smith, 1983;Bedford and Lee, 1994). The erosion constants obtained in this experiment are fall within the above normal range and are consistent with numerical calculations.…”

Field measurement of the erosion threshold of silty seabed in the intertidal flat of the Yellow River Delta with a newly-developed annular flume

“…Typical values are generally taken to be 5E-05 kg m -2 s -1 (Mulder and Udink, 1991). Previous studies have reported erosion constants ranging from E-05 to E-04 (Green and Black, 1999), 1.5E-05 to 3E-04 (Drake and Cacchione, 1989;Vincent and Downing, 1994;Guilleń et al, 2002), with higher and lower values also reported (e.g., Wiberg and Dungan Smith, 1983;Bedford and Lee, 1994). The erosion constants obtained in this experiment are fall within the above normal range and are consistent with numerical calculations.…”

Examination of reference concentration under waves and currents on the inner shelf

“…The characteristic shear velocity, u * , can be either u * c or u * cw depending on dynamical flow conditions [Lee et al, 2002[Lee et al, , 2003. The use of a one-layered Rouse-type equation in regression analysis of near-bed ABS concentration is consistent with previous observations that has shown the inferred eddy diffusivity profile to increase linearly close to the bed [Vincent and Downing, 1994;Sheng and Hay, 1995;Vincent and Osborne, 1995;Lee et al, 2002Lee et al, , 2003, and that separate slopes to the concentration profile associated with u * c and u * cw above and within the wave boundary layer cannot be resolved using ABS.…”

“…However, values of the crucial resuspension coefficient g o reported by various workers vary from 10 À5 to 10 À2 [Drake and Cacchione, 1989;Hill et al, 1988;Webb and Vincent, 1999] and, under some conditions, decrease with increasing skin-friction shear velocity [Vincent and Downing, 1994;Vincent and Osborne, 1995].…”

Spectral estimates of bed shear stress using suspended‐sediment concentrations in a wave‐current boundary layer

“…Several different closure schemes for such settings have been proposed [e.g., Sleath , 1990], but little effort has been made to resolve their general applicability under field conditions. Important exceptions include studies by Vincent and Downing [1994] who, by examining with ABS data obtained in wave‐current flows, inferred that eddy diffusivity increases linearly from the bed to about 20‐cm elevation and decreases above that level. Subsequent studies in different settings have supported this view [ Sheng and Hay , 1995; Vincent and Osborne , 1995; Lee et al , 2002].…”

Field measurement of the erosion threshold of silty seabed in the intertidal flat of the Yellow River Delta with a newly-developed annular flume

“…Typical values are generally taken to be 5E-05 kg m -2 s -1 (Mulder and Udink, 1991). Previous studies have reported erosion constants ranging from E-05 to E-04 (Green and Black, 1999), 1.5E-05 to 3E-04 (Drake and Cacchione, 1989;Vincent and Downing, 1994;Guilleń et al, 2002), with higher and lower values also reported (e.g., Wiberg and Dungan Smith, 1983;Bedford and Lee, 1994). The erosion constants obtained in this experiment are fall within the above normal range and are consistent with numerical calculations.…”

Examination of reference concentration under waves and currents on the inner shelf

“…The characteristic shear velocity, u * , can be either u * c or u * cw depending on dynamical flow conditions [Lee et al, 2002[Lee et al, , 2003. The use of a one-layered Rouse-type equation in regression analysis of near-bed ABS concentration is consistent with previous observations that has shown the inferred eddy diffusivity profile to increase linearly close to the bed [Vincent and Downing, 1994;Sheng and Hay, 1995;Vincent and Osborne, 1995;Lee et al, 2002Lee et al, , 2003, and that separate slopes to the concentration profile associated with u * c and u * cw above and within the wave boundary layer cannot be resolved using ABS.…”

“…However, values of the crucial resuspension coefficient g o reported by various workers vary from 10 À5 to 10 À2 [Drake and Cacchione, 1989;Hill et al, 1988;Webb and Vincent, 1999] and, under some conditions, decrease with increasing skin-friction shear velocity [Vincent and Downing, 1994;Vincent and Osborne, 1995].…”

Spectral estimates of bed shear stress using suspended‐sediment concentrations in a wave‐current boundary layer

“…Several different closure schemes for such settings have been proposed [e.g., Sleath , 1990], but little effort has been made to resolve their general applicability under field conditions. Important exceptions include studies by Vincent and Downing [1994] who, by examining with ABS data obtained in wave‐current flows, inferred that eddy diffusivity increases linearly from the bed to about 20‐cm elevation and decreases above that level. Subsequent studies in different settings have supported this view [ Sheng and Hay , 1995; Vincent and Osborne , 1995; Lee et al , 2002].…”

Field measurement of the erosion threshold of silty seabed in the intertidal flat of the Yellow River Delta with a newly-developed annular flume

“…Typical values are generally taken to be 5E-05 kg m -2 s -1 (Mulder and Udink, 1991). Previous studies have reported erosion constants ranging from E-05 to E-04 (Green and Black, 1999), 1.5E-05 to 3E-04 (Drake and Cacchione, 1989;Vincent and Downing, 1994;Guilleń et al, 2002), with higher and lower values also reported (e.g., Wiberg and Dungan Smith, 1983;Bedford and Lee, 1994). The erosion constants obtained in this experiment are fall within the above normal range and are consistent with numerical calculations.…”

Examination of reference concentration under waves and currents on the inner shelf

“…The characteristic shear velocity, u * , can be either u * c or u * cw depending on dynamical flow conditions [Lee et al, 2002[Lee et al, , 2003. The use of a one-layered Rouse-type equation in regression analysis of near-bed ABS concentration is consistent with previous observations that has shown the inferred eddy diffusivity profile to increase linearly close to the bed [Vincent and Downing, 1994;Sheng and Hay, 1995;Vincent and Osborne, 1995;Lee et al, 2002Lee et al, , 2003, and that separate slopes to the concentration profile associated with u * c and u * cw above and within the wave boundary layer cannot be resolved using ABS.…”

“…However, values of the crucial resuspension coefficient g o reported by various workers vary from 10 À5 to 10 À2 [Drake and Cacchione, 1989;Hill et al, 1988;Webb and Vincent, 1999] and, under some conditions, decrease with increasing skin-friction shear velocity [Vincent and Downing, 1994;Vincent and Osborne, 1995].…”

Spectral estimates of bed shear stress using suspended‐sediment concentrations in a wave‐current boundary layer

“…Several different closure schemes for such settings have been proposed [e.g., Sleath , 1990], but little effort has been made to resolve their general applicability under field conditions. Important exceptions include studies by Vincent and Downing [1994] who, by examining with ABS data obtained in wave‐current flows, inferred that eddy diffusivity increases linearly from the bed to about 20‐cm elevation and decreases above that level. Subsequent studies in different settings have supported this view [ Sheng and Hay , 1995; Vincent and Osborne , 1995; Lee et al , 2002].…”