Final Report
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Coastal Regional Sediment Management Plan Central Coast from Pt. Conception to Pt. Mugu Final Report January 2009 Coastal Regional Sediment Management Plan Central Coast from Pt. Conception to Pt. Mugu Beach Erosion Authority for Clean Oceans and Nourishment Board of Directors Staff County of Santa Barbara Brian Brennan, Executive Director Salud Carbajal, Supervisor 1st District Janet Wolf, Supervisor 2nd District Gerald Comati, Project Manager County of Ventura James Bailard, Technical Advisor Steve Bennett, Supervisor District 1 John C. Zaragoza, Supervisor District 5 Patrick Barnard, Special Technical Advisor City of Goleta Karl Trieberg, Staff Advisor Ed Easton, Councilmember Rick Raives, Staff Advisor City of Santa Barbara Das Williams, Councilmember Kevin Ready, Legal Counsel City of Carpinteria Gregg Carty, Mayor City of Ventura Brian Brennan, Councilmember City of Oxnard Bryan MacDonald, Councilmember City of Port Hueneme Jon Sharkey, Mayor Prepared in cooperation with the California Coastal Sediment Management Workgroup and the U.S. Army Corps of Engineers Los Angeles District Kim Sterrett, Program Manager for the California Department of Boating and Waterways Clif Davenport, Project Manager for the CSMW Heather Schlosser, Acting Section Chief, Coastal Planning for the USACE January 2009 BEACON CRSMP Page i Final Report Table of Contents Introduction 1 Understanding Our Coast 3 Challenges and Opportunities 16 The Plan 19 Public Comment 33 List of Tables Table 1 Estimated Sediment Supply to the Coast from Rivers and Streams 10 Table 2 Challenges and Opportunities for the BEACON Coast 18 Table 3 BEACON CRSMP Recommended Activities 22 List of Figures Figure 1 BEACON’s Member Agencies 2 Figure 2 The BEACON Coast 4 Figure 3 BEACON CRSMP Planning Reaches 6 Figure 4 Existing Shoreline Armoring 8 Figure 5 Shoreline Trends between Point Conception and Mugu Submarine Canyon 9 Figure 6 Fluvial and Seacliff Sediment Sources along the BEACON Coast 11 Figure 7 Additional Sediment Sources near the BEACON Coast 13 Figure 8 Schematic Diagram of Shoreline Processes along the BEACON Coast 14 Figure 9 The BEACON CRSMP 24 List of Appendices Appendix A List of References 37 Appendix B Glossary of Terms 41 Appendix C Economic Analysis of the BEACON Coast 42 Appendix D Environmental Review of Candidate CRSMP Projects 74 BEACON CRSMP Page ii Final Report Introduction Regional Sediment Management (RSM) is a Sediment Master Plan (SMP). To date there planning approach that seeks to address have been a number of separately funded coastal sediment processes and issues on a studies and projects related to the SMP that broader geographic scale. It recognizes that range from physical data collection, review sand, cobble, and fine sediment is an of environmental effects, socioeconomic important natural resource that is critical to analysis, GIS database development, policy the environmental health and economic review, and beneficial reuse of sediment. vitality of the coastal zone. The sediment is what makes up the beaches, resides offshore In recognition of the diverse nature of the in significant deposits, and is delivered to California coastline, the CSMW intends to the coast from inland source areas by the fulfill the regional sediment management various rivers and streams. The relevant objectives of the SMP by developing a sediment processes extend from inland series of regional Plans that are watersheds to offshore areas. This broad geographically specific to and target the coverage overlaps multiple geopolitical distinct shoreline segments of the California boundaries which explains why a regional coast. The Coastal Regional Sediment planning perspective is needed. Management Plans (CRSMP) are intended to formulate regionally relevant consensus- Regional Sediment Management is about driven sediment management policy and having greater understanding and knowledge guidance in order to restore, preserve and about all of the interrelationships between maintain coastal beaches and other critical coastal and offshore sediment deposits, areas of sediment deficit, sustain recreation inland origins of coastal sediment, sediment and tourism, enhance public safety and pathways to the coast, and how sand moves access, and restore coastal sandy habitats. about the shoreline. From this knowledge base, improved sediment management The Beach Erosion Authority for Clean decisions, policies, and practices can be Oceans and Nourishment (BEACON) is a formulated and implemented on a regional Joint Powers Authority composed of Santa scale to preserve or enhance existing Barbara and Ventura Counties and the six beaches, address inter-related resource needs cities of Goleta, Santa Barbara, Carpinteria, and opportunities, and optimally manage Ventura, Oxnard, and Port Hueneme (see coastal projects for the regional benefit. Figure 1). BEACON’s CRSMP provides the opportunity to revisit its past and California has been actively engaged in ongoing programs, fine tune its goals and finding ways and means to resolve coastal objectives, and map practical erosion and sediment management issues on implementation strategies into the future. a broader scale. The process has been As such its CRSMP is intended to develop a formalized by the State Resources Agency comprehensive road map that addresses how and its member Departments by joining to conserve and restore the valuable together with the US Army Corps of sediment resources along its coastline to Engineers (USACE) and other advisory reduce shoreline erosion and coastal storm groups to form the Coastal Sediment damages, protect sensitive environmental Management Workgroup (CSMW). This resources, increase natural sediment supply multi-agency body has been charged with to the coast, preserve and enhance beaches, the task of coordinating and collaborating improve water quality along the shoreline, toward development of a California and optimize the beneficial use of material BEACON CRSMP Page 1 Final Report Introduction dredged from ports, harbors, and other clarified. Thus the traditional first step in opportunistic sediment sources. any planning process is to: 1) understand the baseline science and relevant physical In order to be effective, the BEACON processes; 2) identify the challenges that CRSMP must be: currently exist and the corresponding opportunities that can be seized to positively technically sound and practical; move forward; and 3) formulate appropriate action plans and solutions that have environmentally sensitive; unanimity of purpose. When applied to coastal sediment management, this planning politically realistic; and process will allow BEACON to identify and understand its sediment management goals financially feasible and sustainable and objectives more clearly so that strategy, policy, and capital improvement projects can In order to formulate a specific Plan, a clear be more effectively targeted and better understanding of what needs to be solved focused to clear purpose and consensus and what objectives are possible should be within the coastal zone. Figure 1. BEACON's Member Agencies BEACON CRSMP Page 2 Final Report Understanding Our Coast - Regions The BEACON coast includes the entire Region are relatively unaltered from their shoreline of Santa Barbara County and most natural state. Human interventions have of the Ventura County shoreline. The unit mainly been limited to dam construction defines the limits of the approximately 144- within the Santa Maria River and Santa mile long Santa Barbara Littoral Cell which Ynez River watersheds. extends from the mouth of the Santa Maria River to the Mugu Submarine Canyon. This Central Region two-county shoreline segment may be divided into three distinct regions as shown The central region of the BEACON coast in Figure 2 that vary in their shoreline extends from Point Conception to the orientation, physical characteristics, land Ventura River. This 74-mile long stretch of use, and population density. shoreline runs in a general east-west direction. Unlike the North Region, the North Region beaches are semi-protected from Pacific Ocean swell by the Santa Barbara Channel. The North Region extends from the mouth The shoreline is characterized as of the Santa Maria River at the Santa mountainous coast with narrow to non- Barbara County Line south to Point existent beaches that are flanked by Conception. This section of coast is numerous headlands and rocky points. The generally oriented in the north-south beaches that do exist consist of relatively direction and is fully exposed to the Eastern thin veneers of sand over hard bedrock and Pacific Ocean and the northwest swell that are backed by high bluffs and marine dominates the wave climate. The shoreline terraces. Some wider sandy beaches do between the Santa Maria and Santa Ynez exist at lower relief coastal areas and stream Rivers mouths has long and broad dune discharge locations. The natural supply of backed beaches separated by rocky points. sediment to the coast within the southern The more southern stretch of the region Santa Barbara County and western Ventura transitions to more inaccessible mountainous County region is principally from the coast where the shoreline intersects the numerous steep gradient mountain creeks Santa Ynez mountain range. Along this that populate the Santa Ynez Mountains coastal segment beaches are narrow to non- watershed. To a lesser extent additional existent and backed by high bluffs and sediment is contributed to the littoral system variable width marine terraces. from