2008 Annual Monitoring Report (pdf 10.9MB) - Bolsa Chica ...

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Bolsa Chica Lowlands Restoration Monitoring 2008 Annual Report Beach profile plots accompany this report in Appendix 2-B. Summary tables and figures are interspersed with the text, while supporting data are provided in Appendices 2-C, 2-D, 2-E, and 2-F. Historical Background Information The Bolsa Chica study area is contained within the Huntington Beach littoral cell, which spans the shoreline from the East Jetty of Anaheim Bay to the Newport Harbor Entrance. The area has been studied extensively as part of the CCSTWS-OC (USACE 2002) and in prior federal studies. Prior to significant coastal development, sand was delivered to the littoral cell from the San Gabriel and Santa Ana Rivers, with modest input from coastal bluff erosion. The littoral transport regime changed substantially following construction of the Long Beach/Los Angeles Harbor Complex, the jetties at Anaheim Bay (for the U.S. Navy Weapons Station, Seal Beach), and numerous flood control measures. Coastal erosion was particularly severe in Surfside-Sunset Beach and West Newport Beach. Figure 2-8. Location map Merkel & Associates, Inc. 115
Bolsa Chica Lowlands Restoration Monitoring 2008 Annual Report In response to the loss of private and public property caused by erosion, the U.S. Army Corps of Engineers, in concert with the State of California and the County of Orange, has undertaken periodic beach nourishment operations in the Huntington Beach cell since 1964. The majority of the sand nourishment has been placed at Surfside-Sunset Beach, immediately upcoast of the Bolsa Chica study area. Table 2-3 summarizes the beach nourishment history at Surfside-Sunset Beach. The next nourishment episode (Stage 12) is planned for winter/spring 2009. The beaches along the Bolsa Chica study area benefited as the downdrift recipient of the Surfside- Sunset nourishment material. During the 34-year period between 1963 and 1997, the beaches advanced at four of the five historical transects included in the Bolsa Chica monitoring program. Mean sea level (MSL) shoreline advance ranged from 14 m at Transect 423+89 to 71 m at Transect 350+71. The only occurrence of shoreline retreat during the 34-yr period was a loss of 18 m at Transect 378+28, located at Huntington Cliffs. The volume of sand above MSL increased in parallel to the beach width changes during the period. The shorezone volumes in the study area, which incorporate the sediment changes further offshore, increased at all of the sites. The greatest gains typically occurred prior to 1978 (USACE, 2002). Table 2-3. Beach nourishment history. Date Placement Site Borrow Site Volume (m 3 ) 1964 Surfside/Sunset (Stage 1) Naval Weapons Station 3,058,000 1971 Surfside/Sunset (Stage 4) Naval Weapons Station 1,728,000 1979 Surfside/Sunset (Stage 7) Nearshore Borrow Pit 1,257,000 1983 Surfside/Sunset (Stage 8) Naval Weapons Station 382,000 1984 Surfside/Sunset (Stage 8) Nearshore Borrow Pits 1,147,000 1984 Surfside/Sunset (Stage 8) Naval Weapons Station 497,000 1988 Surfside/Sunset Naval Weapons Station 138,000 1990 Surfside/Sunset (Stage 9) Nearshore Borrow Pits 1,393,000 1997 Surfside/Sunset (Stage 10) Nearshore Borrow Pit 1,223,000 2002 Surfside/Sunset (Stage 11) Nearshore Borrow Pit 1,707,000 Source: USACE, 2002; Mesa, 2008a Historical Shoreline Data Historical shoreline data were used to provide context for the results of the current Bolsa Chica monitoring program. The available beach profile and beach width measurement data are summarized below. Historical Beach Profile Data As indicated above, five of the beach profile transects used in the Bolsa Chica monitoring program were included in the CCSTWS-OC. The study incorporated data from 18 beach profile surveys conducted between 1963 and 1997. The U.S. Army Corps of Engineers conducted an additional beach Merkel & Associates, Inc. 116
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