where

2 ε*t*

(17) Figure III-2-39 is a nondimensionalized solution graph for the case of a triangular planform beach

nourishment. Only the portion of the solution graph for *x *$ 0 is presented, as the solution is symmetric for

values of *x *less than zero.

(18) A fourth case to be considered is that of a long fill project with a gap as shown in Figure III-2-40.

For the case in which a beach nourishment has been placed on an existing beach but a gap has been left in

the beach nourishment project (such as occurred in a beach nourishment project on Jupiter Island, Florida,

in 1974), the following solution would apply:

% *erfc*

1&

1%

(III-2-34)

2

2 ε*t*

2 ε*t*

The nondimensionalized solution graph for this particular planform of beach nourishment is provided in

Figure III-2-41. Only the portion of the solution graph for *x *$ 0 is presented, as the solution is symmetric

for values of *x *less than 0.

(19) A fifth case to be considered is that of the end of a rectangular fill on a long beach nourishment

project as shown in Figure III-2-42. The nondimensional solution graph for the case of a semi-infinite beach

fill where the fill is contained within the area *x *> 0 is given in Figure III-2-43. This semi-infinite beach fill

case can be utilized to provide the shape of the end of a long beach fill and the extent of the fill as it

progresses down the coast with time. The solution for this specific case is

1 % *erf*

(III-2-35)

2

2 ε*t*

Longshore Sediment Transport

III-2-69

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