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Southwest Wetlands Interpretive Association

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Seal Beach Sedimentation Augmentation Project. Panoramic view of the site following completion of sediment augmentation.

Seal Beach Sediment Augmentation Project

This pilot project, implemented by SWIA in conjunction with the State Coastal Conservancy and USFWS, consists of the addition of a thin-layer (8-10 inches) of clean dredged sediments to 10 acres of a low elevation salt marsh within the Seal Beach National Wildlife Refuge in Orange County, CA.

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January 28, 2019 //  by admin

This pilot project, implemented by SWIA in conjunction with the State Coastal Conservancy and USFWS, consists of the addition of a thin-layer (8-10 inches) of clean dredged sediments to 10 acres of a low elevation salt marsh within the Seal Beach National Wildlife Refuge in Orange County, CA. 

A pre-addition baseline analysis of the marsh has been prepared and 5 years of post-addition monitoring of the effects of sediment augmentation are underway.

At the conclusion of monitoring, a guidance document will be prepared concerning sediment augmentation as an adaptive strategy. 

The monitoring data will answer the question of whether adding a thin layer of sediment to an existing, cordgrass-dominated marsh plain will improve elevations to resist sea-level rise effects and improve habitat quality for associated flower and fauna (i.e., Ridgway’s clapper rail).

Seal Beach Sedimentation Augmentation Project. Cordgrass present in the sediment augmentation area (2017)
Cordgrass present in the sediment augmentation area (2017)
Seal Beach Sedimentation Augmentation Project. Panoramic view of the site following completion of sediment augmentation.
Panoramic view of the site following completion of sediment augmentation.
Photo: USGS/C. Freeman

Category: Key Projects, Projects & Programs

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