Citation
Midtown beach nourishment project in Palm Beach, Florida

Material Information

Title:
Midtown beach nourishment project in Palm Beach, Florida October 1995 to August 1996
Series Title:
UFLCOEL-97001
Alternate title:
Monitoring report
Creator:
Dean, Robert G ( Robert George ), 1930-
University of Florida -- Coastal and Oceanographic Engineering Dept
Place of Publication:
Gainesville Fla
Publisher:
Coastal & Oceanographic Engineering Dept., University of Florida
Publication Date:
Language:
English
Physical Description:
v, 8, 48 leaves : ill. ; 28 cm.

Subjects

Subjects / Keywords:
Beach nourishment -- Florida -- Palm Beach ( lcsh )
Shore protection -- Florida -- Palm Beach ( lcsh )
Genre:
non-fiction ( marcgt )

Notes

General Note:
"February 24, 1997."
Statement of Responsibility:
prepared for town of Palm Beach ; prepared by Robert G. Dean.

Record Information

Source Institution:
University of Florida
Holding Location:
University of Florida
Rights Management:
The University of Florida George A. Smathers Libraries respect the intellectual property rights of others and do not claim any copyright interest in this item. This item may be protected by copyright but is made available here under a claim of fair use (17 U.S.C. §107) for non-profit research and educational purposes. Users of this work have responsibility for determining copyright status prior to reusing, publishing or reproducing this item for purposes other than what is allowed by fair use or other copyright exemptions. Any reuse of this item in excess of fair use or other copyright exemptions requires permission of the copyright holder. The Smathers Libraries would like to learn more about this item and invite individuals or organizations to contact Digital Services (UFDC@uflib.ufl.edu) with any additional information they can provide.
Resource Identifier:
36846219 ( OCLC )

Full Text
UFL/COEL-97/015

MONITORING REPORT MIDTOWN BEACH NOURISHMENT PROJECT IN PALM BEACH, FLORIDA October 1995 to August 1997
by
Robert G. Dean

December 12, 1997
Prepared for:
Town of Palm Beach Post Office Box 2029 360 South County Road Palm Beach, Florida 33480




MONITORING REPORT

MIDTOWN BEACH NOURISHMENT PROJECT IN PALM BEACH, FLORIDA
October 1995 to August 1997
December 12, 1997
Prepared For:
Town of Palm Beach Post Office Box 2029
360 South County Road
Palm Beach, Florida 33480
Prepared by:
Robert G. Dean
Department of Coastal and Oceanographic Engineering
University of Florida
Gainesville, Florida 32611




TABLE OF CONTENTS
L IST O F FIG U R E S ........................................................ iii
LIST O F TA B LE S ........................................................ iv
IN TR O D U CTIO N .......................................................... I
R E SU L T S ................................................................ 3
Changes in Nourishm ent Area ................................................ 3
B each Profiles ........................................................ 3
Longshore Distributions of Volume Densities and Plan Areas ..................... 5
Changes in Total Volumes and Plan Areas ................................... 5
Discussion of Results for the Nourishment Area ............................... 5
Changes Along the North Beaches ............................................. 8
P rofi les .... .............. .. .. ........ ......... ................. .... 8
Sand Bypassing to the North Beach ....................................... 15
V olum e Changes ..................................................... 15
Shoreline Changes .................................................... 15
Changes in Excavated Borrow Area ....................................... 15
Sand C haracteristics ....................................................... 15
SUMMARY AND CONCLUSIONS .......................................... 22
M idtown Nourishment Area ................................................. 22
N orth B each A rea ......................................................... 22
Sediment Sample Characteristics ............................................. 22
RE FERE N CE S ........................................................... 23




LIST OF FIGURES

FIGURE PAGE
1 Location Map of Project Area Showing Borrow and Nourishment Areas. (Adapted
from ATM Drawing) ................................................ 2
2 Profiles at DNR Monument R-97D 129 for Five Available Surveys .................4
3 Volume Changes Due to Nourishment Project ............................... 6
4 Shoreline Changes Due to Nourishment Project .............................. 7
5 Percentage Total Volume and Plan Area Remaining in Shoreline Segment Placed .......9
6 Profiles at DNR Monument R-77 for Five Available Surveys ....................10
7 Profiles at DNR Monument R-78 for Five Available Surveys ....................11
8 Profiles at DN1( Monument R-79 for Five Available Surveys ....................12
9 Profiles at DNR Monument R-80 for Five Available Surveys ....................13
10 Profiles at DNR Monument R-8 1 for Five Available Surveys ....................14
11 Cumulative Volumes of Sand Added by Sand Bypassing Plant ...................16
12 Volume Changes Due to Nourishment Project in the North Beach Area ............ 17
13 Shoreline Changes Due to Nourishment Project in the North Beach Area ........... 18
14 Profiles at DNIR Monument R-79 Emphasizing Excavation Area for Five Available
Surveys ......................................................... 19
15 Profiles at DNR Monument R-80 Emphasizing Excavation Area for Five Available
Surveys......................................................... 20
16 Comparison of Pre- and Post Nourishment Sediment Characteristics .............. 21




LIST OF TABLES
TABLE PAGE
I D ates of M onitoring Surveys ............................................. 3
2 Changes in Total Volumes and Plan Areas ................................... 5




MONITORING REPORT

MIDTOWN BEACH NOURISHMENT PROJECT IN PALM BEACH, FLORIDA
October 1995 to August 1997
INTRODUCTION
During the period October 18, 1995 to December 10, 1995, approximately 880,000 cubic yards of sand were dredged from a borrow area extending from approximately 2,000 feet south to 4,800 feet south of the southjetty at Lake Worth Entrance and placed along portions of Midtown Beach section in the Town of Palm Beach, Florida. The project specifications required placement of 800,000 cubic yards; thus the excess 80,000 cubic yards is "overfill". As shown in Figure 1, the cross-shore dimensions of the borrow area varied from 1,600 feet at its northern end to 2,500 feet at its southern end. The original depths at the borrow area site varied from 25 to 35 feet and the maximum dredged depths were approximately 40 feet. The dredged sand was placed along the Midtown Beach as nourishment extending from via Bethesda at the north end to via Marina at the south end, a distance of approximately 5,400 feet. To provide stability to the nourishment project, eleven groins were constructed. The locations of these groins are shown in Figure 1 along with the borrow area and the approximate platform of the nourished beach. Sea Systems, Inc has conducted a pre-nourishment and four post-nourishment surveys to document the performance of the project. The purpose of this report is to present the results of an analysis of these five surveys.
The dates of the surveys are presented in Table 1. As can be seen from this table, although the placement of material was completed in December 1995, the first post-nourishment survey was not completed until April 9, 1996 due to the activities related to groin construction. During the period between completion of nourishment and the first post-nourishment survey, a significant northeaster occurred (March 8-10, 1996) which undoubtedly caused the transport of some sand from the nourished beach. Thus, since the first post-nourishment survey post-dated the March storm, the first post-nourishment survey does not reflect the total amount of sand placed.
This report updates the monitoring results through the August 1997 survey. Previous monitoring results are reported in Dean (I 997a, 1997b). Additionally, this report also presents an analysis of the shoreline and volume changes at the north end of the study area in the vicinity of the borrow area and a comparison of the pre- and post-nourishment sediment size characteristics.




Borrow Area
- 19
R-a7 OCEAN i
R-ea 0 1.0
4 Scale (Miles)
01-90
?-93
?-92
f''86 ATLANTIC
-aOCEAN I
,-88 0 1.0
-89 Scale (Miles)
-go
Rl-92
-93 Typical Groin, One of Eleven
-9, Numbered From SI at the North tc
S11 at the Southern End
,-95
Project Site
98
S-lo00
Figure 1. Location Map of Project Area Showing Borrow and Nourishment Areas.
(Adapted from ATM Drawing).




Table 1
Dates of Monitoring Surveys

Survey Number Type of Survey Dates
1 Pre-Nourishment October 13-21, 1995
2 Post-Nourishment April 1-9, 1996
3 Post-Nourishment August 12-25, 1996
4 Post-Nourishment March 31 to April 8, 1997
5 Post-Nourishment August 27-30, 1997
RESULTS
This section includes analysis of changes in the nourishment area, analysis of changes along the North Beach in the vicinity of the borrow area and in the borrow area and a comparison of the preand post-nourishment sand size characteristicss. Because the previous reports have not presented an analysis of the changes along the North Beach area and because the changes in the nourishment area during the latest intersurvey period were small, more focus is provided for the North Beach area.
Changes in Nourishment Area
The results are presented in various forms, including examples of beach profiles, longshore distribution of additional volumes as a function of time, longshore distribution of additional beach width as a function of time and total additional areas and volumes as functions of time.
Beach Profiles Figure 2 present an example of the available beach profiles in the nourishment area. Because the latest intersurvey period was one of relatively small change, detailed plots of all of the profiles are not presented in this report. Figure 2 depicts the pre- and post-nourished profiles at Monument R-97D 129 which is located at approximately mid-length of the nourishment project. This is in an area where the shoreline revetment is located and prior to the nourishment, there was no beach at mean tide as the water was at the revetment. After nourishment, there was approximately 150 feet of additional dry beach present. The presence of the natural offshore reef extending from 700 feet to 1,200 feet from the seawall is evident in Figure 2. Also evident from this plot is that there was very little change from the April post-nourishment survey to the August post-nourishment survey. The small changes are attributed to the relatively mild waves during this intersurvey period. As will be evident later, the more substantial changes have occurred during the winter periods.




20
October 1995
3 10 ...................................................Ap r 199
> .April 1996
k. ........ August 1996
Z 0 i . ............................,r .... .......... ................. A p ril 19 9 7
O August 1997
-4-j
(1)
.> -10'
IT -20 ....... ...
0
a)
WU -400 1000 2000 3000
Seaward Distance from Monument (if)
Figure 2. Profiles at DNR Monument R-97D129 for Five Available Surveys




Longshore Distributions of Volume Densities and Plan Areas Figure 3 presents the longshore distribution of additional volume density along the project area. It is seen that on average, an additional 150 cubic yards per foot of beach front were present in April 1996. As noted for the profile presented in Figure 2, most of the volumetric changes have occurred during the winter months. The volume densities in Figure 3 represent the volumes to approximately 1,000 feet seaward from the monument. As can be seen by referring to Figure 3, this distance extends out onto the natural reef.
Figure 4 presents the longshore distribution of additional beach width within the project area in a form similar to that presented for volume density. Substantial similarities exist between the volume densities and additional beach widths. The changes between the April and August surveys are relatively small as they are for the volume densities.
Changes in Total Volumes and Plan Areas Table 2 presents the total changes in volumes and plan areas from the pre-nourishment survey to the four post-nourishment surveys. These results are discussed in the following section.
Table 2
Changes in Total Volumes and Plan Areas
Period Change in Volume (yd3) Change in Plan Area (Acres)
October 1995 to April 1996 +794,900" (+759,900) +18.4 (+17.9)
October 1995 to August 1996 +790,400" (+754,800) +18.4' (+17.7)
October 1995 to April 1997 +684,100" (+648,200) +14.4" (+14.0)
October 1995 to August 1997 +672,400" (+640,100) +14.4" (+14.0)
*Notes: These changes are from Monument R-941 to R- 1 OOC, a longshore distance of 6,100 feet.
The numbers in parentheses represent the changes over the 5,400 feet constructed Project
length.
Discussion of Results For The Nourishment Area Based on the four post-nourishment surveys, the Midtown Beach project has performed quite well, generally maintaining, within expectations, the volume and plan area from the first post-nourishment survey to the second, third and fourth postnourishment surveys. The first five month post-nourishment period (April 1996 to August 1996) is for a generally mild weather period whereas the second seven month post-nourishment period (August 1996 to April 1997) is for a generally more energetic wave period. The latest intersurvey period (April 1997 to August 1997) which is a focus of this report was again during the summer period when smaller waves are expected. The area and volume changes reflect the wave energy levels of these periods. Accepting the reported placement volume of 880,000 cubic yards, the




300

.-UUO rvgs v u ... 200. ... ....... April 1997
, ------- August 1997
>.
S. .. ...
. : 1 0 0 %.. . . . .- \ ". ]........ .... . . .. .. ,", -.,,.. . . .. . .
':"~(Y 44- ',, (0oo6 11- 0 0 0';, CD
a1)
2 0
o Project Limnits
-100 ,
0 1000 2000 3000 4000 5000 6000 7000 8000
Distance South of Monument R-94E (ft)

Figure 3. Volume Changes Due to Nourishment Project




300

I I

1000

2000

. I. . .

3000

4000

5000

6000

7000

Distance South of Monument R-94E (ft)
Figure 4. Shoreline Changes Due to Nourishment Project

I

200 100
0

CD
C:
C:
w
0

-100

8000

. . . . .

I

I I 1
April 1996
.......... August 1996
. April 1997 ................. August 1997
.
. ... .. .... .
*. V ....
CC)
0 r (0 r-- 0*-
Project Limits
! I I

I




volumetric loss from placement to August 1997 within the placement area is 27.3%. Moreover, approximately one-half of this loss occurred during the period when the groins were not in place and during which the intense March 1996 storm impacted the Palm Beach area. The losses during the five month winter period, April 1997 to August 1997 within the placement area represent approximately I % of the material placed. The total losses during the one year period August 1996 to August 1997 within the placement area may represent the losses to be expected during a typical year after nourishment and amount to 13.0 %.The total losses within the 6, 100 ft segment from R941 to R- I OOC during this one-year period are 13 .4 %.
The area changes during and subsequent to nourishment parallel approximately the volumetric changes. Although a survey was not conducted immediately after nourishment, it is estimated that the initial plan area increase above NGVD (approximately Mean Sea Level) datum was approximately 20.5 acres. Based on this value, the reduction in plan area within the nourished area during the period in which the March 1996 storm occurred was 12.5%. The reduction in plan area in the placement segment during the ftill year from August 1996 to August 1997 was 16. 1%. Some of this reduction in plan area was due to the sand moving from the steeper placement profiles toward the milder equilibrium profiles. These changes in profile slope are evident in the individual profiles, an example of which is presented in Figure 2.
Nourishment losses are expected to decrease as the effective length of the project becomes greater due to spreading of sand from the nourishment area. Additionally, at the Midtown Project, the stabilizing effects of the groins should start to occur soon. Two final points are relevant to evaluating project performance: (1) The project performance to date reflects two winter seasons during which the volumetric losses are expected to be greater and two summer seasons during which the volumetric losses are usually less. These expectations are supported by the data. Very little changes appear to occur during the summer months, and (2) Since permit conditions require renourishment when 40% of the project volume has been transported from the placement area, this would occur when the volume remaining is 480,000 cubic yards. Figure 5 presents a graph of the percentage volume and plan area remaining along the project beach. These results are normalized by 880,000 cubic yards for initial volume and 20.5 acres for initial plan area.
Changes Along the North Beaches
Profiles There are five profiles along the North Beach Area extending from the south jetty at the Port of Palm Beach Entrance to approximately 4,000 feet south of the jetty. Referring to Figure 1, it is seen that these profiles span the borrow area and it will be shown that two of the profiles pass through the excavated borrow area. These five profiles are presented in Figures 6, 7, 8, 9 and 10. It is seen that the profiles at Monuments R-79 and R-80 pass through the excavated borrow area; however, the other three profiles along the North Beach do not. The following further sections discuss the changes along the North Beach area.




100
90 .... ..... ............... Volumes
.......... Plan Areas
C:80 __....
6 0 .............. ...... i ....... ... .i .... ............... ......... ............ ... .. .t . .
6 .. ...~ .............
7 0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
... .. .. .... ..... tI"... .. .
6 0 . . . . . . . . . . .... . . . . . . . . . . . . . . i L . . . . . a ) . .
a)
0)) 0"
*..-:0"
m 3 . . . . . . . . . . . .. . . . . . . . c .. . . . . . . . . . . . . . . . . . .. . . .
-. "- .,)
0 .. .
4D 0 .- - - . . . . . . . . . . . . . . . . . . . . . . . . .. .
O . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..
0 5 10 15 20
Months After Completion of Nourishment
Figure 5. Percentage Total Volume and Plan Area
Remaining in Shoreline Segment Placed




20
10 ...*....October 1995
o) A
..........................................April 1996
.... ... .. ... ... ... .... .. ... .. --- --- A ugust 1996
Z April 1997
0 -10 ..........August 1977
ai)
.............................. ................... ......
o 2 . ..*. . .
. . . . . . .
ID -3 .. .. .. .. . .*. . . . . I . .
0 00 0030040050
Seawrd istace romMonuent(if
Fiur 6...... Prfie at..DNR.Monument.R-77
-40 ~~ o Five......... Available....... Surveys........




20
1.... ............ .................. .........coe19
.. .......................................................April1996
August 1996
April 1997
0 -"... .... ....... August 1997
(-30
r 0 .. . . .. . .. .. .. .. .. .. . .. . . . .. .. . .. .. .. . .. .. : . . . . . . . . . . . . . .
~-0
> 0 . . . . . . ... . . .... . . . ... . . . . . . . . . . .. . . . . . . . . . . :.. . "
> -50
(1)
LU -60 I
0 1000 2000 3000 4000 5000
Seaward Distance from Monument (ft)
Figure 7. Profiles at DNR Monument R-78 for Five Available Surveys




1000

2000

3000

2
0
z
0
a) Co
0
i LU

Seaward Distance from Monument (ft) Figure 8. Profiles at DNR Monument R-79
for Five Available Surveys

20 10
0
-10
-20
-30
-40
-50
-60

.................... .................. ............ O c to b ei
.......... April 19
.AI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ". A u g u s t
-- ....... April 19
.g...... ugust
. .. . . . .. . . . . .. .... . . . . . . ... . . . . . . . . . . .. . . . . . . . : . . . .
.. . . . . .... . . . . . . . ... . . . . . . . . . . .. . . . . . . . . . .

r1995 96 1996
97 1997

4000

5000

. . . . . . . -




1 0 .......................................................... October 1995 '
0
o ..... ................................Arl1996 .
0 -. ......... April 1996
-4 0 ..... i .......... ..... : ............... i ......... . . : .. ....... . . . . . . .
0 ~August 1996 Z---- April 1997
0 -10 ...... .......August 1997
> .5 ...................... . . . . . .. .. . . . . .. ............ 21... .. ....... ...
-4 4................................ ..............
o
Lci _6 :-.
W -601 II
0 1000 2000 3000 4000 5000
Seaward Distance from Monument (ft)
Figure 9. Profiles at DNR Monument R-80 for Five Available Surveys




20~
10 ....October 1995
> April 1996
(D 0 .....August 1996
z ------ April 1997
0 0 ... .. ... ... ... ... ... .. ...... ... ... ... ... .. ... ..A ugust 1997
>~~ -60 ..... .. .
040 100.200.300.000500
Seaward Distance from Monument (ft)
Figure 10. Profiles at DNR Monument R-81 for Five Available Surveys




Sand Bypassing to the North Beach Sand bypassing commenced to the North Beach area after refurbishing of the sand transfer plant located on the north jetty of the Port of Palm Beach Entrance. Figure I11 presents the cumulative bypassing after the initiation of dredging for the nourishment project in October 1995. It is seen that a total of 327,900 cubic yards has been bypassed since the sand transfer plant recommenced operation in May 1996.
Volume Changes Figure 12 presents the longshore distribution of volume changes along the North Beach monitored length in the same format as was presented for the nourished beach in Figure 3. The effects of the sand placed in the bypassing operations is evident and has caused advancement of the beaches along the entire 4,000 feet monitored length.
Shoreline Changes Figure 13 presents the longshore distribution of shoreline changes documented by the North Beach profiles. This figure is in the same format as was presented for the nourished area in Figure4 The similarities between the volume and shoreline changes (Figures 12 and 13) are evident. Again the bypassing operations have caused accretion in this area.
Changes in Excavated Borrow Area Figures 14 and 15 present the available profiles through the borrow area at the profiles from Monuments R-79 and R-80. These are the same profiles shown in Figures 8 and 9, except in an expanded form to focus on the excavation area. Examining these figures shows that there has been only a small amount of filling of the excavated area and this has occurred from the landward side. This filling appears to be a result of profile adjustment with the profile on the landward side of the excavation seeking a milder slope. The contours at depths smaller than 20 feet appear to be unaffected.
Sand Characteristics
In 1993, sand samples were collected and analyzed in conjunction with the monitoring program of the PEP Reef Project. Sand samples were also collected in early 1996 after construction of the beach nourishment project. Many sand samples were collected in 1993 and extended from the top of the berm to the twelve feet depth contour. On average, seven samples were collected at each longshore position sampled. A total of six samples were collected in 1996 at three locations along the nourishment project with one sample at the beach face and one at the six feet contour. Figure 16 presents a comparison of the average and range of sediment sizes before and after nourishment. It is seen that the characteristics of the pre- and post nourishment sand are quite similar.




0.5
0
M
c: 0.4
0
-00.3
0.20.2
0
0.1
E
0.0
0.0

0.2 0.4 0.6 0.8 1.0 1.2 1.4

1.6

1.8 2.0

Years After October 1995
Figure 11. Cumulative Volumes of Sand Added
by Sand Bypassing Plant




100,,,,
8 0 .............................. A pril 1996
.......... August 1996
. 6 0 ......... . ...................... .................... ......
CO. . . .. A p ril 1 9 9 7
40 ..... .. .................. u 1
. . . . . . .... .. . . ... . . . . : .. . . . . . . . . . . . .
2 0 ........
0
0 100-200-00 40
Fi .gur.1 .2... V .. Changes DetNorsmn Project
.. ....... .The.No..h.. B e
0_ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
.., ( > -60 ............... .. -..
-8 0 ..................................... .. .. .. ............... . ......... ............ . . .
-100 i
0 1000 2000 3000 4000 5000
Distance South of Monument R-77 (ft)
Figure 12. Volume Changes Due to Nourishment Project in The North Beach Area




. . . . . . .

.. . .. . . . .
oN

4%
N .
"%

N
* N

c,)
C
-z
c
C)
a)
a)
L
0 C
(D

. .
I I I I I

1000

2000

3000

4000

5000

Distance South of Monument R-77 (ft)
Figure 13. Shoreline Changes Due to Nourishment Project
in The North Beach Area

200

100
0

* S
- S
S. *
* S. S
* *~5*
,,,,,,,,,,,,,,,,,,,,,,,,,. S. S

April 1996
.......... August 1996
........ April 1997
-August 1997

-100




-20 1 .
o . . . . . . .. . .. .. . . . . ... ... . .
z-30
O c o e 9 5 . . . .. ..... .
>0
0 -40 October 1995 .. . .e.:,.' ...
April 1996
o August 1996
1,3 April 1997
> August 1997
a1)
LU. -50 i I i
1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000
Seaward Distance from Monument (ft)
Figure 14. Profiles at DNR Monument R-79 Emphasizing
Excavation Area for Five Available Surveys




02 (D
CD -4 0
> Ocgte 1995:7~
oewr Augustc 1996oum n (t
Figure 15. P~roil 1997MouetR-0Ephszn
ExaainAe o iv vial uvy




1.00
(D 1993 sampling (4 profiles).
0.80 1997 sampling (3 profiles)
E 0.60E
S0.400.20 -0.00
10
0.20 "'_ -.._.__ __0.0 _ _ __ __o_ __ __ _ __ __ _ _
U
-15 I 1 I I t
0 100 200 300 400 500
Offshore Distance (ft)
Figure 16. Comparison of Pre- and Post Nourishment Sediment Characteristics.




SUMMARY AND CONCLUSIONS

This report has presented an analysis of the changes occurring in the nourishment area, the North Beach and borrow areas and also has presented a comparison of the sand characteristics in the nourishment area before and after nourishment. Each of these three components is discussed below.
Midtown Nourishment Area
Based on the four post-nourishment surveys in the nourished area, the Midtown Beach project has performed quite well, generally maintaining, within expectations, the volume and plan area from the first post-nourishment survey to the second, third and fourth post-nourishment surveys. Nourishment losses are expected to decrease as the effective length of the project becomes greater due to spreading of sand from the nourishment area. At the Midtown Project, the stabilizing effects of the groins should start to occur soon. Two final points are relevant to evaluating project performance: (1) The project performance to date reflects two winter seasons during which the volumetric losses are greater and two summer seasons during which the volumetric losses are usually less. These expectations are supported by the data. Very little changes appear to occur during the summer months, and (2) Since permit conditions require renourishment when 40% of the project volume has been transported from the placement area, this would occur when the volume remaining is 480,000 cubic yards. Figure 6 presents a graph of the percentage volume and plan area remaining along the project beach.
North Beach Area
Five profiles are available to document changes occurring in the North Beach area. Two of these profiles pass through the excavated borrow area. Bypassing of some 327,900 cubic yards to the North Beach area via the sand bypassing plant located on the north jetty of the Port of Palm Beach Entrance has caused general shoreline advancement and volume increases in this area. Some limited filling of the excavated borrow area are evident in the latest surveys, but the filling is considered minor.
Sediment Sample Characteristics
Comparison of the sediment sample characteristics before and after nourishment indicate that they are reasonably compatible.




REFERENCES

Dean, R. G. (1997a) "Midtown Beach Nourishment Project in Palm Beach, Florida: October 1995 to August 1996", University of Florida, Department of Coastal and Oceanographic Engineering Department, Report No. UFL/COEL-97/001.
Dean, R. G. (1997b) "Midtown Beach Nourishment Project in Palm Beach, Florida: October 1995 to April 1997", University of Florida, Department of Coastal and Oceanographic Engineering Department, Report No. UFL/COEL-97/013.