Table 6. Monitoring of P.E.P. Reef at Vero Beach, Florida.

Monitoring Program

Figure 24. Cumulative shoreline change at Vero Beach P.E.P. Reef installation (Stauble, 2002).

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Submerged Narrow-Crested Breakwaters

Table 6. Monitoring of P.E.P. Reef at Vero Beach, Florida.

Events/Other Monitoring

P.E.P. Installation

Scour/Air Photos

Scour/Air Photos

Scour/Air Photos

Several Storms

operating wave gage Stations 4 and 5 (control) only; (3)

operating wave gage Stations 1 (offshore), 2 and 3 (at P.E.P. Reef) only; (5)

perating wave gage Stations 1, 2, 3, 4, and 5.

ural reef positions. Morphologic features such as the MHW

tion 3 was placed close to the structure due to the shallow

line (identified as the visible wet/dry line which is slightly

water depth landward of the P.E.P. Reef. Two additional con-

different from the shoreline derived from a datum elevation

trol wave gages were installed 183 m (600 ft) to the south of

off the profiles), seawalls and dune locations were determined

the southern P.E.P. Reef terminus at similar cross-shore lo-

from the photographs and compared with previous photo-

cations and depths as the primary wave gage pair. The pur-

graphs. The P.E.P. Reef positions in relation to the landward

pose of these control wave gages were to measure waves at

beach and natural hardbottom reef were visible on most of

locations unaffected by the P.E.P. Reef so that wave trans-

the photographic sets. Construction of photo mosaics allowed

mission effects due to the natural reef could be compared

for an overview of the regional coastal morphology at Vero

with the P.E.P. Reef. The seaward control gage (Station 4)

was located in 3.5 m ( 11.5 ft) water depth and the land-

Beach and to see details of the highly variable natural hard-

ward control gage (Station 5) was located in 2.7 m ( 9 ft)

bottom locations and extent. Minimal change was observed

in the natural reef pattern, but the shoreline position and

water depth near profile transect R-84A. All four of these

beach width changed over the study.

wave gages (2 thru 5) were located landward of the natural

Five self-recording directional pressure (Puv) wave gages

reef outcrop (STAUBLE, 2002).

were installed in the vicinity of the P.E.P. Reef at various

Monitoring Results

times over the first two years of the study. This wave gage

monitoring was ended around September 1998 and no wave

Shoreline Response

gages were deployed after that time. The outer gage, referred

to as Station 1, was located in 7.3 m ( 24 ft) NGVD water

During the August 1996 to June 1999 period, the change

depth and characterized the offshore wave climate. Two gag-

in shoreline position (defined as the mean high water line,

measured as the 0.58 m ( 1.91 ft) NGVD elevation datum

es were placed on the seaward (Station 2) and landward (Sta-

tion 3) sides of Reef Segment G near profile line R-82 to re-

from the beach profiles), averaged a large 10.5 m (34.4 ft) of

cord wave transmission effects (Figure 23). Using a Differ-

seaward movement in the north control. The P.E.P. Reef zone

averaged 2.8 m ( 9.28 ft) of landward movement and the

ential Global Positioning System (GPS), Station 2 was located

approximately 23 m (75 ft) seaward of Segment G in 3.5 m

south control averaged a landward movement of 1.7 m

( 11.5 ft) of water, and Station 3 was located 6.1 m (20 ft)

( 5.6 ft). Figure 24 shows this relative pattern of seaward

landward of Segment G at around 2.7 m ( 9 ft) depth. Sta-

movement in the north control, a landward movement in the

Journal of Coastal Research, Vol. 19, No. 3, 2003

Western Governors University

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