2007 Annual Monitoring Report (pdf 16MB) - Bolsa Chica Lowlands ...

Bolsa Chica Lowlands Restoration Monitoring2007 Annual Report(Note: It is not possible to assess the shorezone volume changes for the Bolsa Chica Monitoringperiod because the October 2005 profile does not extend below the waterline.)Figure 2-15. Bolsa Chica Monitoring Period Subaerial Volume Changes, Oct. 2005 to Oct. 2007.Beach Width MeasurementTime series plots for the beach width measurements obtained by Moffatt and Nichol at the seven BolsaChica area transects and at three nearby locations by the U.S. Army Corps of Engineers are presentedin Appendices 2-E and 2-F, respectively.The results of the beach width measurements obtained at the seven Bolsa Chica area transects aresummarized in Table 2-6. During the 11-month period between the January and Decemberobservations, the MSL beach width decreased at one of the seven sites, increased at four locations, andwas essentially unchanged (3 m or less) at the remaining two sites. The greatest shoreline advance was17 m, and occurred immediately north of the entrance channel at Transect 318+30. The onlyoccurrence of shoreline retreat was a loss of 8 m immediately south of the Bolsa Chica entrancechannel at Transect 333+30.Merkel & Associates, Inc. 86