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Title: Midtown beach nourishment project in Palm Beach, Florida
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Permanent Link: http://ufdc.ufl.edu/UF00091061/00008
 Material Information
Title: Midtown beach nourishment project in Palm Beach, Florida October 1995 to August 1996
Series Title: UFLCOEL-97001
Alternate Title: Monitoring report
Physical Description: v, 8, 48 leaves : ill. ; 28 cm.
Language: English
Creator: Dean, Robert G ( Robert George ), 1930-
University of Florida -- Coastal and Oceanographic Engineering Dept
Publisher: Coastal & Oceanographic Engineering Dept., University of Florida
Place of Publication: Gainesville Fla
Publication Date: 1997
 Subjects
Subject: Beach nourishment -- Florida -- Palm Beach   ( lcsh )
Shore protection -- Florida -- Palm Beach   ( lcsh )
Genre: government publication (state, provincial, terriorial, dependent)   ( marcgt )
non-fiction   ( marcgt )
 Notes
Statement of Responsibility: prepared for town of Palm Beach ; prepared by Robert G. Dean.
General Note: "February 24, 1997."
 Record Information
Bibliographic ID: UF00091061
Volume ID: VID00008
Source Institution: University of Florida
Holding Location: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: oclc - 36846219

Table of Contents
    Front Cover
        Front Cover
    Title Page
        Page i
    Table of Contents
        Page ii
        Page iii
    Main
        Page 1
        Page 2
        Page 3
        Page 4
        Page 5
        Page 6
        Page 7
        Page 8
        Page 9
        Page 10
        Page 11
        Page 12
        Page 13
Full Text




UFL/COEL-99/018


MONITORING REPORT


MIDTOWN BEACH NOURISHMENT PROJECT
IN PALM BEACH, FLORIDA
October 1995 to April 1999


by




Robert G. Dean


July 28, 1999
(Revised September 14, 1999)



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 April 1999






July 28, 1999
(Revised September 14, 1999)







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



LIST OFFIGURES ......................... .............................. iii

LIST OF TABLES ........................ ................................... iii

INTRODUCTION ........................................................1

RESULTS ............................................ .......................3

Beach Profiles ....................................................... 3

Longshore Distributions of Shoreline Change and Volume Density ................ 7

Changes in Total Volumes and Plan Areas .................................... 7

Changes in Volume and Average Shoreline Position Along the North Beach Area .... 10

SUMMARY AND CONCLUSIONS ........................ ................ 10

REFERENCES .............................................................. 13








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-96D Located Approximately One-Quarter of
Nourished Length From North End of Project........... ................. ... 4

3 Profiles at DNR Monument R-97C126 Located Approximately Midway Along
Nourished Project ...................................................... 5

4 Profiles at DNR Monument R-98G Located Approximately Three Quarters of
Nourished Length From North End of Project .................................. 6

5 NGVD Shoreline Changes Due to Nourishment Project .......................... 8

6 Volume Changes Due to Nourishment Project ................................. 9

7 Percentage Total Volume and Plan Area Remaining in Placement Area ............ 11

8 Cumulative Sand Placed on North Beach by Sand Transfer Plant and From Channel
Maintenance Dredging .................................................. 12


LIST OF TABLES


TABLE PAGE

1 Dates of Monitoring Surveys .............................................. 3

2 Changes in Total Volumes and Plan Areas ................................. 10









MONITORING REPORT


MIDTOWN BEACH NOURISHMENT PROJECT
IN PALM BEACH, FLORIDA
October 1995 to April 1999


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 south jetty at Lake Worth Entrance and placed along portions of the Midtown Beach
section in the Town of Palm Beach, Florida. 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 planform of the nourished beach. Sea Systems, Inc has conducted a pre-nourishment
survey and seven 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 eight surveys.

The dates of the surveys are presented in Table 1. Although the placement of material was completed
in December 1995, as can be seen from Table 1, the first post-nourishment survey was not completed
until April 9, 1996 due to 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 April 1999 survey. Previous monitoring
results, presented in Dean (1997a, 1997b, 1997c, 1998a and 1998b), provide details on aspects of
the nourishment project not addressed in the present report.

















Borrow Area


-a87 OCEAN I I
-88 0 1.0
-89 Scale (Miles)
-90
j-91

-92

S-93 Typical Groin, One of Eleven

S 11 at the Southern End
-95
P -Project Site
S~-97




-100



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

6 Post-Nourishment April 22-27, 1998

7 Post-Nourishment August 17-31, 1998

8 Post-Nourishment April 6 12, 1999


RESULTS

The results are presented in various forms, including examples of beach profiles, longshore
distribution of additional beach width for several surveys, longshore distribution of additional
volume for several surveys, and total additional areas and volumes as functions of time. In addition,
the total volumes added and volume change and average shoreline change over the latest intersurvey
period in the north beach monitored area are reported.

Beach Profiles

Figures 2, 3 and 4 present examples of beach profiles in the nourishment area. Figures 2, 3 and 4 are
located at approximately one-quarter, one-half and three quarters of the distance from the northerly
to the southerly limits of the beach nourishment project, respectively. In order to maintain the
number of surveys presented reasonable, only the pre-nourishment survey (October 1995), the first
post-nourishment survey (April 1996), the third post-nourishment survey (April 1997), the fifth post-
nourishment survey (April 1998), and the most recent survey (April 1999) are presented on these
plots. It is seen from inspection of these figures that the northern most profile has been eroded the
most, whereas the profiles located midway and near the southern end of the Project have experienced
less erosion. This is consistent with the southerly direction of net longshore sediment transport in
a sediment deficient coastal system.







20
October 1995
......... April 1996
1 0 . ..... ................ .................................. -- -- -- -- A p ril 19 9 7
9 ------- April 1998
S' .. .... April 1999
0 0 :








a) k
-20


W -30 U -
0 1000 2000 3000
Seaward Distance from Monument (ft)

Figure 2. Profiles at DNR Monument R-96D Located Approximately

One-Quarter of Nourished Length From North End of Project














O
0







0
0)


w
n,
t-*

>U


20



10



0



-10



-20



-30


1000


2000


3000


Seaward Distance from Monument (ft)

Figure 3. Profiles at DNR Monument R-97C126 Located

Approximately Midway Along Nourished Project


?t.
'I'


- ....... X ....... .....


I.


-S~
. . . .. . . . . .


October 1995
......... April 1996
-------- April 1997
------- April 1998
--.. April 1999


I


' '~-'







20
October 1995
Q ......... April 1996
> 10 ; -------- April 1997
------- April 1998
Z '-....... April 1999

s oR A \t, *s, .
Oa
..0 . ................................. ........................ ..... ........... .. .. .............
O

()

.o -20


WLL -30
0 1000 2000 3000
Seaward Distance from Monument (ft)

Figure 4. Profiles at DNR Monument R-98G Located Approximately

Three Quarters of Nourished Length From North End of Project







Longshore Distributions of Shoreline Change and Volume Density


Figure 5 presents the longshore distribution of shoreline change within the nourishment area for the
first post-nourishment survey (April 1996) and for all subsequent April surveys. There was a
moderate decrease in beach width during the last intersurvey period, although, on average, there is
still approximately 83 feet of additional beach width in the Project area as a result of the beach
nourishment project. During the last intersurvey period, the average beach width decreased by 7.3
feet. Part of this decrease in beach width is due to sand being transported offshore rather than due
to a volume loss. Figure 6 presents the additional volume density along the Project area. There is
actually a volume gain during the most recent intersurvey period of approximately 4.4 cubic yards
per foot of beach which is considered a relatively small amount. There is still an average of
approximately 115 cubic yards per foot of beach of additional sand volume within the Project area
as a result of the nourishment project.

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
seven post-nourishment surveys. The above statement regarding the loss in beach width is evident
in the reduction in total plan area. Additionally, the small gain in sediment volume during the last
intersurvey period is also evident. The additional volume remaining in April 1999 was almost
identical to that remaining in April 1998.

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)
October 1995 to April 1998 +657,800' (+620,500) +11.1* (+10.6)
October 1995 to August 1998 +628,600* (+593,300) +11.8* (+11.2)
October 1995 to April 1999 +650,488 (+616,800) 10.6* (+10.3)

*Notes: These changes are from Monument R-94I to R-100C, a longshore distance of 6,100 feet.
The numbers in parentheses represent the changes over the 5,400 feet constructed
Project length.







300
April 1996
......... April 1997
: : ------- April 1998
.200 - April 1999
--- 2 0 0 ..... ..... ....... ... ..... ... .. .... . . .... ... A p ril 1 9 9 9 ... ..


-- ,- ---: , ,, .. . .
0 .-, -100 "-\ -
100







-100 '
0 1000 2000 3000 4000 5000 6000 7000 8000
Distance South of Monument R-94E (ft)

Figure 5. NGVD Shoreline Changes Due to Nourishment Project







300 -
April 1996
-------- April 1997
: ------- April 1998
200 .-.-. . .- April 1999 .........



S.100 .




Project Lim its



-100 '
0 1000 2000 3000 4000 5000 6000 7000 8000
Distance South of Monument R-94E (ft)

Figure 6. Volume Changes Due to Nourishment Project








Figure 7 presents the history of percentage change in total volume and plan area. It is seen that as
of April 1999, there is approximately 50% of the placed plan area remaining and 70% of the placed
volume remaining in the placement area. Although the placed plan area was not determined prior
to the March 1996 storm it was estimated to be 20.5 acres. As noted from Figure 7, there was a small
increase in the volume and a small decrease in the plan area between August 1998 and April 1999.

Changes in Volume and Average Shoreline Position Along the North Beach Area

Since initiation of the Midtown Beach Nourishment Project, sand has been deposited along the North
Beach area by both the sand transfer plant operated by Palm Beach County with funding for this
operation provided by the Town of Palm Beach and channel maintenance dredging operations by
the U. S. Army Corps of Engineers. The sand transfer plant is located on the north jetty of Lake
Worth Entrance and pumps sand from the vicinity of the north side of the north jetty across the
channel to the south side of the Entrance. The sand transfer plant recommended operations in May
1996 after being refurbished and the installation of a new discharge line. As of April 1999,
approximately 413,200 cubic yards of sand had been transferred by the plant as shown in Figure 8.
Since October 1995, the total sand placed from channel maintenance dredging by the U. S. Army
Corps of Engineers was approximately 433,700 cubic yards, also shown in Figure 8. The sum of
these two placements is 846,900 cubic yards. Of this total approximately 227,400 cubic yards is
documented to remain within the 4,376 feet North Beach monitored area. During the intersurvey
period addressed in this report (August 1998 to April 1999), the amounts placed in the North Beach
area by the sand transfer plant and from maintenance dredging are 41,300 cubic yards and 52,928
cubic yards, respectively for a total of 94,228 cubic yards. Of this amount, approximately 31,700
cubic yards is documented to remain within the 4,376 feet north beach monitored segment. Thus,
62,500 cubic yards have been transported from the monitored area during the last intersurvey period.
The average shoreline retreated by less than 1 foot over the North Beach monitored shoreline
segment during this intersurvey period.

SUMMARY AND CONCLUSIONS

This report has presented an analysis of the changes occurring in the Project area associated with the
Midtown Beach Nourishment Project. Nourishment of this project commenced 3.5 years prior to the
most recent monitoring and was completed 3.3 years prior to the most recent survey (April 1999).

Based on the seven post-nourishment surveys representing approximately 3.5 years since
nourishment, the Midtown Beach project has performed quite well. Of the 880,000 cubic yards
placed, there are some 616,800 cubic yards remaining in the placement area. As shown from Figure
7, the volume has increased slightly during the last intersurvey period and the additional plan area
has decreased slightly during the last intersurvey period, from 11.2 acres to 10.3 acres. This area is
relative to the pre-nourishment condition when there was almost no beach area. As of the April 1999
survey, approximately 70% of the volume placed remained in the placement area and 50% of the dry
beach plan area were present. It is evident that the groins are functioning to stabilize the sand placed
in the 1995 beach nourishment project.






100
S ................ ................... ...... Volumes
S 0 ....Plan Areas


E 70
80 --60 .- -
7 0 *. -*... .. .. . .. .. ............. & ...... Z . ......... ..... ..........
I 67 0 ............ . .... .. .. . ...

S50. .... A ....

3D 0
30 ........... -. 0

C. 400 -
U 2 0 ... ... ... ... .
r < Q 4_
S...... ... ....# ...... ..... . < .........
M a . ..- . M -: M - -
30 ----------
S 0 1 2 3 4
Years After Completion of Nourishment

Figure 7. Percentage Total Volume and Plan Area
Remaining in Placement Area







-0
From Channel Maintenance
>-........ Placed by Sand Transfer Plant

400

0
W .. . . . . . . . . ... ... . . . . . . . . . .
4-




a 100







0 0


1995 1996 1997 1998 1999 2000200
(1)
E




O :




1995 1996 1997 1998 1999 2000
Years

Figure 8. Cumulative Sand Placed on North Beach by Sand Transfer Plant

and From Channel Maintenance Dredging









The monitored north beach area accumulated approximately 31,700 yd3 during the most recent
intersurvey period and the average shoreline receded by less than 1 foot in this region.

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.

Dean, R. G. (1997c) "Midtown Beach Nourishment Project in Palm Beach, Florida: October 1995
to August 1997", University of Florida, Department of Coastal and Oceanographic Engineering
Department, Report No. UFL/COEL-97/015.

Dean, R. G. (1998a) "Midtown Beach Nourishment Project in Palm Beach, Florida: October 1995
to April 1998", University of Florida, Department of Coastal and Oceanographic Engineering
Department, Report No. UFL/COEL-98/012.

Dean, R. G. (1998b) "Midtown Beach Nourishment Project in Palm Beach, Florida: October 1995
to August 1998", University of Florida, Department of Coastal and Oceanographic Engineering
Department, Report No. UFL/COEL-98/019.




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