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

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Bolsa Chica Lowlands Restoration Monitoring 2008 Annual Report profile survey of the area in March 2002. More recent shoreline data are available from several Light Detection and Ranging (LIDAR) surveys commissioned by the Scripps Institution of Oceanography. These data were used to provide historical context for the results of the current Bolsa Chica monitoring program. The survey data used in the CCSTWS-OC for the period 1963-1995 were retrieved from the archives maintained by the Scripps Institute of Oceanography. The 1997 and 2002 survey data were obtained from the Coastal Frontiers Corporate archives. LIDAR data for October 2005 and March 2006 were retrieved from archives maintained by NOAA (NOAA 2008). The beach profile data used in the CCSTWS-OC are summarized in Figure 2-9. The historical surveys are not uniform with respect to profile location or areal extent. The U.S. Army Corps of Engineers in support of the Surfside-Sunset nourishment program, navigation channel deepening at Anaheim Bay, or the CCSTWS-OC, performed most of the surveys. The transect locations differ among surveys due Surfside-Sunset Bolsa Chica Huntington Cliffs Huntington Beach West Newport 0 10000 20000 30000 40000 50000 60000 70000 80000 0 May-63 2 Jul-64 Oct-66 4 Apr-69 May-73 6 Dec-78 Jul-79 8 Apr-82 Jan-83 0 Feb-92 May-92 2 Nov-92 May-93 4 Oct-93 Apr-94 6 Oct-94 May-95 8 Nov-97 0 Station (feet) Surveyed Transect CCSTWS-OC Transect Figure 2-9. Beach profile data used in CCSTWS-OC CCSTWS-OC Transect used in Bolsa Chica Monitoring Program to the scope of each project and the perceived needs at the time of each survey. Only the profile data obtained between 1992-1997, and more recently in March 2002, are coincident with the transect locations used in the CCSTWS-OC. In order to allow a comprehensive analysis based on the direct comparison of successive profiles at fixed locations, the CCSTWS-OC study employed a triangular irregular network (TIN) model to Merkel & Associates, Inc. 117
Bolsa Chica Lowlands Restoration Monitoring 2008 Annual Report develop a set of “synthetic” profiles for the survey years with data that were not coincident with the CCSTWS-OC transect locations (typically the pre-1992 surveys). For the purposes of the Bolsa Chica monitoring program, the same TIN model approach was used to “re-generate” the synthetic profiles used in the CCSTWS-OC. This approach was not necessary for the data that were coincident with the transect locations (1992-1997 and 2002). The LIDAR data consists of densely spaced topographic points derived from an airborne survey. These data encompass the entire shoreline of the Bolsa Chica study area, but do not extend below the waterline. Beach profiles were created at each of the five historical transects and the two newly established transects using a TIN model developed from the LIDAR results. Synthetic profiles also were developed for the two newly established transects for March 2002 and several of the pre-1992 CCSTWS-OC survey dates. Using the same TIN model approach described above, synthetic profiles were created for each case when historical survey data bracketed the location of the two newly established transects and at least one of the bracketing transects was not coincident with a historical transect. Profiles were generated for the following eight survey years: May 1963, July 1964, October 1966, April 1969, May 1973, April 1982, January 1983, and March 2002. Historical Beach Width Measurements U.S. Army Corps of Engineers personnel have acquired monthly beach width measurements along the Orange County coast since 1977. This extensive data set was initiated by Robert Clancy. Since the late 1980’s, Chuck Mesa of the Corps has continued the monthly data collection program. The data set contains measurements from a consistent back beach position to the break-in-slope at the beach berm. The location of the berm does not represent a vertically-referenced shoreline (such as the MSL shoreline). However, the measurements do provide an indication of gross changes in beach configuration. To differentiate these measurements from beach widths derived from profile data or from the beach width measurements collected on behalf of the Bolsa Chica project, they will be referred to hereafter as “Corps beach widths”. Three of the measurement stations are located within or immediately adjacent to the Bolsa Chica study area: 247+88, 308+88, and 424+44. These stations are not coincident with the transect locations used for the CCSTWS-OC or the Bolsa Chica monitoring program. The beach width measurements at these stations were retrieved from the U.S. Army Corps of Engineers (Mesa 2008b, 2009). Methodology Beach Profile Surveys Beach profile data were obtained on two occasions in 2008: May 12 and October 28. The methods employed were similar to those used on previous Orange County surveys. In consequence, the results are directly comparable. The data acquisition and reduction methods are described below. The wading and bathymetric portions of each survey were performed concurrently by two crews, as illustrated in Figure 2-10. Data were acquired along each transect from the back beach to a depth of approximately 14 m below NAVD88. Wave heights typically were less than 1 m during each of the surveys. Merkel & Associates, Inc. 118
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