EVEREST June, 2013 - California Department of Boating and ...

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Orange County Coastal Regional Sediment Management Plan • Sand dredged from harbor channels can be placed at locations that optimize the beneficial use of the material; • Beach erosion can be reduced by restoring natural watershed processes, bypassing sand around harbors, replenishment with sand dredged from offshore or transported from inland projects, and reducing coastal armoring. Sediment Trapped Behind Dams and Debris Basins Urbanization of Watershed Sand and Gravel Mining Sand and gravel sold for construction. Sediment excavated and placed nearby. Sand held in place by urbanization. Degraded Wetlands Harbor Beach Erosion due to Less Sand Sand Trapped by Harbor Structures Dredged sand placed on nearby beaches. Less Sand to Coast Ocean Coastal Armoring Reduces Sediment Supply to Beaches Beach replenished with sand dredged from offshore. Figure 2.1 Existing Sediment Management Schematic Everest International Consultants, Inc. 2.3
Orange County Coastal Regional Sediment Management Plan Sediment Trapped Behind Dams and Debris Basins Sediment excavated and bypassed downstream. Urbanization of Watershed Sand held in place by future urbanization is compensated through projects or fees. Restored Wetlands Harbor Sand and Gravel Mining Sand loss compensated through projects or fees. Sand from harbors placed on beaches in need. Mining moved out of river. More sand transported to coast. Less Beach Erosion Sand Trapped by Harbor Structures More Sand Reaching Coast Ocean Reduced Coastal Armoring Increases Sediment Supply to Beaches Beach replenished with sand dredged from offshore or transported from inland projects. Figure 2.2 RSM Schematic 2.2 Physical Processes This section of the report briefly describes basic physical processes useful for understanding sediment transport in the upland and coastal areas. 2.2.1 Watershed and Sedimentshed A key aspect of the Plan is that it is regional in nature, which means it should encompass both what occurs on the beaches and in the uplands, where much coastal sediment has historically Everest International Consultants, Inc. 2.4
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EVEREST June, 2013 - California Department of Boating and ...

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