Subsided Islands Subsided Islands ID: 183922
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Subsided Island Restoration Plan in the Sacramento-San Joaquin DeltaThe Natural Heritage Institute Subsided Islands Subsided IslandsMicrobialoxidationand shrinkageWind erosionBurningWithdrawal of natural gas and groundwater Twitchell Island StudyDemonstration of Techniques for Reversing the Effects of Subsidence in the Sacramento San Joaquin DeltaWe know we can reverse subsidence, the question is how long will it take? Mean accretion rates (+ Standard Error) from cryogenic soil cores. West Pond (W) flooded to 25 cm, East Pond (E) flooded to 55 cm.Black areas and numbers are organic matter %. W1998E1998W1999E1999W2000E2000W2001E2001 Mean Accretion (cm) 026814 36.036.436.435.235.235.137.937.3USGS-DWR Subsidence Mitigation Wetland Ponds, Twitchell Island Data are Preliminary and Subject to ChangeCore Bulk densities: 0.07 to 0.19 g/cmUnderlying peat: 0.36 to 0.51 g/cm Flooded conditions arrest Need additional water Need to expand test plots to Subsided Volume (mcy)Adjacent to Risk of Seismic IslandIslandIslandIslandIslandIsland Landscape Gradient Conceptual Model: vegetation and shallow tidal sloughs provide transient habitat value to migrating aquatic and near-aquatic species not currently provided by riprap and steep-sided levee banks. Regional linkages reduce isolation effects of piecemeal project implementation. Regional biogeochemical cycling is linked to sediment movement and establishment and maintenance offirst-order tidal channel ElevationElevation and aerial Percent Organic Content of SoilsSoils map tuleponds Cross levee1.3 MCY 2,000 acres of restored tidal wetlandsRice fill16-32 MCY