40
12 07 1984
35
30
25
25 01 1977
24 12 1979
20
15
12 02 1981
10
27 03 1983
5
0
0
100
200
300
400
500
600
700
Elongation Distance from Origin, m
Fig. 8. Width of spit at Corpus Christi (North) Beach.
1.5
Stn 28+00
1.0
Oct 1977
as built
0.5
MTL (approx.)
0.0
-0.5
-1.0
-1.5
Jul 1981
-2.0
-2.5
-3.0
50
70
90
110
130
150
170
Distance Bayward from Baseline, m
Fig. 9. Representative cross section of Corpus Christi (North) Beach.
Sufficient data are now assembled to test predictions of Eq. 2 of the analytical
model for spit elongation. Fig. 7 indicates that application of a constant (average-
annual) rate of longshore sediment transport is appropriate, and the equation
becomes
20 m 3.5 m
WD
Q=
xS ≈
500 m ≈8,500 m3 / year
(14)
t
4.1 year
This value is close to that (9,200 m3/year) estimated by Kieslich and Brunt
(1989) based on repetitive surveys made of the profile of the northern end of the
beach fill. Rationally, it should be less than their value because some material
observed to move from their profiles would have been transported to the south.
Kraus
12
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