EXAMPLE PROBLEM III-2-1

FIND:

Determine the *K *parameter for use at a site using Bailard's (1984) and del Valle, Medina, and

Losada's (1993) relationships, then calculate the potential volumetric longshore transport rate along the

beach using each *K *value.

GIVEN:

Waves having an rms wave height of 2.0 m (6.7 ft) break on a quartz sand beach with median grain

size, *D*50 = 1.0 mm at a wave breaking angle αb = 4.5o. The temperature of the seawater is 20o C and *w*f

= fall velocity = 13.1 cm/sec. Assume κ = 1.0 for this problem.

SOLUTION:

The maximum oscillatory velocity magnitude is calculated from Equation 2-9 as

κ ( *g d*b )1/2

1 (9.81 2.0)1/2

'

2

2

Therefore, Equation 2-8 may be used, and the coefficient to apply in the longshore sediment transport

equation is,

Applying del Valle, Medina, and Losada's relationship, Equation 2-10,

(&2.5 *D*50)

' 0.12

(Continued)

III-2-16

Longshore Sediment Transport

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