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Title: Midtown beach nourishment project in Palm Beach, Florida
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Permanent Link: http://ufdc.ufl.edu/UF00091061/00005
 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: VID00005
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
    List of Figures
        Page iii
    List of Tables
        Page iv
    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
        Page 14
        Page 15
        Page 16
        Page 17
        Page 18
        Page 19
        Page 20
        Page 21
Full Text




UFL/COEL-98/012


MONITORING REPORT


MIDTOWN BEACH NOURISHMENT PROJECT IN
PALM BEACH, FLORIDA
October 1995 to April 1998




by



Robert G. Dean


July 11, 1998



Prepared for:

Town of Palm Beach
West Palm Beach, Florida 33401

















MONITORING REPORT


MIDTOWN BEACH NOURISHMENT PROJECT
IN PALM BEACH, FLORIDA

October 1995 to April 1998



July 11, 1998






Prepared For:

Town of Palm Beach
Suite A
951 Old Okeechobee Road
West Palm Beach, Florida 33401








Prepared by:

Robert G. Dean
Department of Coastal and Oceanographic Engineering
University of Florida
Gainesville, Florida 32611








TABLE OF CONTENTS


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

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

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

Longshore Distributions of Shoreline Change and Volume Density ................ 12

Changes in Total Volumes and Plan Areas .................................. 12

Changes in Shoreline Position and Volume Density Along the North Beach Area ..... 12

Borrow Area Definition .............................................. 18

SUMMARY AND CONCLUSIONS ........................................ 21

M idtown Nourishment Area ............................................ 21

N north Beach Area ................................................... 21

Borrow Area ...................................................... 21

REFERENCES .......................................................... 21





















ii








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
N ourished Project ..................................................... 5

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

5 Profile at DNR Monument R-78.5 Located Approximately 3,000 Feet South of South
Jetty, Through Borrow Area ............................................. 7

6 Profiles at DNR Monument R-79 Located Approximately 3,500 Feet South of South
Jetty, Through Borrow Area ............................................. 8

7 Profile at DNR Monument R-79.5 Located Approximately 4,000 Feet South of South
Jetty, Through Borrow Area ............................................ 9

8 Profiles at DNR Monument R-80 Located Approximately 4,500 Feet South of South
Jetty, Through Borrow Area ............................................ 10

9 Profile at DNR Monument R-80.5 Located Approximately 5,000 Feet South of South
Jetty, Immediately South of Borrow Area ................................. 11

10 NGVD Shoreline Changes Due to Nourishment Project ........................ 13

11 Volume Changes Due to Nourishment Project ............................... 14

12 Percentage Total Volume and Plan Area Remaining in Placement Area ............ 15

13 Cumulative Volumes of Sand Added by Sand Bypassing Plant ................... 16

14 Shoreline Changes Due to Nourishment Project in the North Beach Area ........... 17

15 Volume Changes Due to Nourishment Project in the North Beach Area ............ 19

16 Depth Contours (feet, NGVD) in Vicinity of Borrow Area ...................... 20








LIST OF TABLES


TABLE PAGE

1 Dates of M monitoring Surveys .................. .......................... 3

2 Changes in Total Volumes and Plan Areas ................................. 18









MONITORING REPORT


MIDTOWN BEACH NOURISHMENT PROJECT
IN PALM BEACH, FLORIDA

October 1995 to April 1998

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 deep. 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 five 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 six 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 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 April 1998 survey. Additionally, this report
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 presents data relating to the borrow area, which were obtained in part,
from three additional survey lines that were conducted in the April 1998 survey for this purpose.
Previous monitoring results, presented in Dean (1997a, 1997b, and 1997c), provide details on
aspects of the nourishment project not addressed in this report.

















Borrow Area


R-a7 OCEAN I I
S-88 0 1.0
-89 Scale (Miles)
-90
R-91
-92

S-9s- Typical Groin, One of Eleven
-94 Numbered From S at the North to
S 11 at the Southern End


SProject Site
-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


RESULTS

The results are presented in various forms, including examples of beach profiles, longshore
distribution of additional beach width as a function of time, longshore distribution of additional
volume as a function of time, and total additional areas and volumes as functions of time.

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) and the most
recent survey (April 1998) 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.

Figures 5, 6, 7, 8, and 9 are profiles in the vicinity of the borrow area. For those profiles that have
been surveyed previously (Profiles R-78 and R-79), the same survey dates are presented as for the
profiles in the nourishment area. Profiles R-78.5, R-79.5 and R-80.5 were surveyed for the first time
during the April 1998 survey to provide a better definition of the borrow area. Figure 5, representing
the profiles at DNR Monument R-78.5 is located approximately 3,000 feet south of the south jetty
and is the most northerly profile which indicates the presence of the borrow area. Figures 6 and 8
document that there has been only minor filling of the borrow area since the April 1996 survey.













0



O
(9


o

0



aU


20


10


0


-10


-20


-30


-40


October 1995
- ...................................... .... April1996
-------- April 1997
------- April 1998
. . . . .
I t .


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


.. . .. ...... .. ... . . .... .... .... ....







20
October 1995
o01 ......... April 1996
> 10 '~ A ............................ .... .................................. ....... April 1997
------- April 1998
Z3 .

o
0 -
V : :_
(D0 \~- '^<-. : --------- ;- ---- -------- --
a 1 . ..... .......... ... .
(U I

40 -20


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

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







20
-- October 1995
10 V .......................... .. ................... ........... April1996 -
> --------.. April 1997
------- April 1998
z -'....... ...... ................... ................... .....................
0 i
0



S -20 .......

0 -


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








20


20

0 10 ................................................... . .
>D'


------- April 1998


-Si


z ~ ~ ~ ---- -- -. .- .-- l- - --%
O '
> 1 0 ............ --- -- ---- --- ............................ ....................... .........
-10



0 I


UI -40
0 1000 2000 3000
Seaward Distance from Monument (ft)

Figure 5. Profile at DNR Monument R-78.5 Located Approximately
3,000 feet South of South Jetty, Through Borrow Area
0. 10020030
Seawar Distnefo ouet(
Figue 5 Proileat DR Mnumnt R78. LoctedApprximtel
3,00 fet out ofSouh Jtty Thoug BorowAre







20
October 1995
10 ................. ............................. ......... April 1996
S.-------- April 1997
(-D\ ------- April 1998




S-0 -- '
01 .. .. ........ . .. ............................ .

Co -


0 -30
S -3 0 ...................... . .... .... ...... ... ............................... . ... .
CU

LW -40 """ "' I
0 1000 2000 3000
Seaward Distance from Monument (ft)

Figure 6. Profiles at DNR Monument R-79 Located Approximately

3,500 feet South of South Jetty, Through Borrow Area








20
\ ------- April 1998
"April 1998i
1 0 .......... .. .. ... ........ .. .. ..;.. .. .. ... ... .. .. .... .... .. ... .. . . ... ... .. ... .... . ... ... .. .

10
0.


tI
> .... .. . . . ......................... .......................... .................................. .







0 40
0 -1000 2000 3000












4,000 feet South of South Jetty, Through Borrow Area
S 0 .....................- ---
S -2 0 ............... .................. :. .

CU .0------------






Figure 7. Profile at DNR Monument R-79.5 Located Approximately

4,000 feet South of South Jetty, Through Borrow Area








20


--
October 1995
O1 0 .................................... ... ................................... ......... A pril 1996
> : .-------- April 1997
S------------- April 1998
Z 0 .............................. .................................. .................................
O ..

> -1 0 -






WU -40

0 1000 2000 3000
LU -40^------------^-----

Seaward Distance from Monument (ft)

Figure 8. Profiles at DNR Monument R-80 Located Approximately

4,500 feet South of South Jetty, Through Borrow Area


I I I I I







20
April 1998
1-0- ------------------------
0 I------- April 1998

> 'I


.0 -10


fL1 -20
0
.. ..................................................





0 1000 2000 3000
Seaward Distance from Monument (ft)

Figure 9. Profile at DNR Monument R-80.5 Located Approximately

5,000 feet South of South Jetty, Immediately South of Borrow Area








Figure 9, which presents a survey of a profile located some 5,000 feet south of the south jetty, shows
only a minor indication of the borrow area. More detailed plots of profiles R-78 and R-79 through
the borrow area are presented in Dean, 1997c.

Longshore Distributions of Shoreline Change and Volume Density

Figure 10 presents the longshore distribution of shoreline change within the nourishment area. There
was considerable decrease in beach width during the last year, although, on average, there is still
approximately 85 feet of additional beach width as a result of the beach nourishment project. Part
of the decrease in beach width will be shown to be due to sand being transported offshore rather than
due to a volume loss. This seaward transport is a normal process due to steep winter waves and much
of this sand is expected to return with the occurrence of the milder summer waves. Figure 11
presents the additional volume density along the Project area. As noted, there is a significantly
smaller volume decrease than beach width supporting the statement of seaward sediment transport.
There is still an average of approximately 120 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
five post-nourishment surveys. The statements regarding the greater changes in beach width are
evident in the reduction in total plan area compared to the relative small decrease in total volume
during the last survey period.

Figure 12 presents the history of percentage change in total volume and plan area. It is seen that as
of April 1998, there is approximately 53% of the placed plan area remaining and 71% of the volume
placed 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.

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

Since initiation of the Midtown Beach Nourishment Project, sand has been transferred by the sand
transfer plant located on the north jetty of Lake Worth Entrance from the north to the south side of
the Entrance. Figure 13 shows the cumulative volumes placed. Sand transfer commenced in May
1996 with the refurbished transfer plant and discharge line. As of April 1998, approximately
370,000 cubic yards of sand had been transferred.

Figure 14 shows the shoreline changes along the North Beach relative to the first survey of shoreline
positions in October 1995. As a result of the transfer of significant volumes of sand to the North
Beach Area, all of the post-nourishment surveys except the first survey in April 1996 document an
advanced shoreline over the first 3,400 feet south of the entrance relative to the October 1995
position.









- -


300


1000


2000


3000


4000


5000


6000


7000


8000


Distance South of Monument R-94E (ft)

Figure 10. NGVD Shoreline Changes Due to Nourishment Project


200




100




0


0)
C
c-


L-

0
( )
O


-100


April 1996
------- April 1997
------- April 1998











:j Lmt
Project Limits
-I i- I I I ii ._i_


I







300 i



200
- --: A p ril 1 9 9 7
S" ----- April 1998



,o 100" .... -

o C" Iq O .00


SProject Limits


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

Figure 11. Volume Changes Due to Nourishment Project






.-- 100 ----------------------------

E 9- -........ .... .. ................ .... Volumes
E 7 0 ................ ................... ...... ... .. ......... ....
f o 80 .... Plan Areas
... ....... ... .. ....... .. .... ........ ....... ..........

c 6 0 - l -A-- - ---- -----------
0 C : I :
S 3 0 .... .... ... .. ... .... ........... ..... .. .. ..... ..... .
5 20 .... ... .. T
S40 .. .................
30- -------..-----------


(1) 0
0 1 2 3
Years After Completion of Nourishment

Figure 12. Percentage Total Volume and Plan Area
Remaining in Placement Area








S 0.5
14--
S0.4

0.3




E 0.2

0 .1



=3 0.0
S 0 1 2 3

Years After October 1995

Figure 13. Cumulative Volumes of Sand Added

by Sand Bypassing Plant








LO 200 i
: April 1996
S- ......... August 1996
) '- "'- -- April 1997
: ------- August 1997


o \ ---.
- April 1998



Q ^ 0 "0 ... ............ ....... ......''
. : : ... ... .




- -100-
S 0 1000 2000 3000 4000 5000
0 Distance South of Monument R-77 (ft)

Figure 14. Shoreline Changes Due to Nourishment Project
in The North Beach Area









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' (+640,100) +11.1' (+10.6)

*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.

Figure 15 presents the volumetric distribution of volume changes per unit beach length along the
North Beach Area. With the exception of the first two post-nourishment surveys, the volume changes
over the northernmost 3,000 feet are positive. The total volume change documented as of the April
1998 survey is +120,000 cubic yards which suggests that the remainder of the bypassed sand
(250,000 cubic yards) has been transported south beyond the monitoring limits of the North Beach
Area.

Borrow Area Definition

As noted previously, the borrow area extends from approximately 2,000 feet to 4,800 feet south from
the south jetty. The actual borrow area depression was defined through a combination of inspection
of the five post-nourishment profiles in the vicinity of the borrow area and examination of a
SHOALS survey conducted on February 20, 1997 which encompasses the borrow area. Figure 16
presents the borrow area contours obtained by this approach.







CO
v 100

i0 80
o,
60

Q) 40


O
o 20
0
E 0
0
&- -20
LL
a) -40
C)
0 -60

S-80
a)
E-100
"5o
O


-. ........... ............ A pril 1996
S......... August 1996
......... . .. . .. .......... .... ............... .... ...... . .. A p ril 19 97 ......
S------- April 1997
S------- August 1997
S.... ........................... ......April1998

...... .. ;- -- -- .
S.. . .. . . . . . . .". ..... . . .. .. . . . . .. ... . . . . . .
"...------------- ---------- "........... .........
... ." ....- A i 1
--- - --. -'-'-- -
- - -- .... .... ....

.. ...... ...... ...... ............ .... .... ......... .............. .. .. .... .... .. .. ....



i p i I I i i


1000 2000 3000 4000

Distance South of Monument R-77 (ft)

Figure 15. Volume Changes Due to Nourishment Project
in The North Beach Area


5000








LAKC WoRTHI ENrRAicE


'u
o
o O

SCO


'- 83, ooN
S' I




4



69210 o0 0
*- \ p i








Figure 16. Depth Contours (feet, NGVD) in Vicinity of Borrow Area








SUMMARY AND CONCLUSIONS


This report has presented an analysis of the changes occurring in the monitoring area associated with
the Midtown Beach Nourishment Project. Nourishment of this project commenced 2.5 years and was
completed 2.3 years prior to the most recent survey in April 1998. Results documenting the changes
in the North Beach Area have been presented including the cumulative volumes added to the beach
through sand transfer, the additional beach width and the additional volumes documented on the
beach. Finally, the contours associated with the borrow area have been presented.

Midtown Nourishment Area

Based on the five post-nourishment surveys representing approximately 2.5 years since nourishment,
the Midtown Beach project has performed quite well. Of the 880,000 cubic yards placed, there are
some 640,100 cubic yards remaining in the placement area. As shown from Figure 12, the decreases
were small even during the last winter storms. The additional plan area has decreased significantly
from the last survey, from 14.0 acres to 10.6 acres relative to the pre-nourishment condition when
there was almost no beach. Much of the decrease in plan area is expected to return during the next
monitoring period as a result of the milder wave action. As of the April 1998 survey, approximately
71% of the volume placed remained in the monitoring area and 53% of the plan area was present.

North Beach Area

The shoreline and volume changes along the North Beach Area are significantly improved relative
to the October 1995 survey which preceded the nourishment. This is due to the transfer of
approximately 370,000 cubic yards of sand to the North Beach Area.

Borrow Area

The characteristics of the excavated borrow area are presented in Figure 16.

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.




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