Model

Marsh98

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Short Description: 
A series of predictions for San Francisco Bay marshplain accretion in response to ranges of initial bed elevation, suspended sediment concentration, organic sediment, and rate of sea level rise.

MARSH98 DESCRIPTION
(for full text see https://groups.nceas.ucsb.edu/wetland-carbon-modeling/documents/copy_of_...)

The Marsh 98 model has been used widely to examine marsh sustainability to sea level rise across San Francisco Bay (e.g. Orr et al., 2003). The Marsh98 model is based on the mass balance calculations described by Krone (1987). This model assumes that the elevation of a marsh plain rises at rates that depend on the (1) availability of suspended sediment and (2) depth and periods of inundation by high tides. When the level of an evolving marsh surface is low with respect to the tidal range, sedimentation rates may be high if the suspended sediment supply is ample.

However, as the marsh surface aggrades through the tidal range, the frequency and duration of flooding by high tides is diminished so that the rate of sediment accumulation declines. Marsh98 implements these physical processes by calculating the amount of suspended sediment that deposits during each period of tidal inundation and sums that amount of deposition over the period of record.

Two revisions were made to the Marsh98 model to more accurately represent physical conditions.

MODEL INPUT PARAMETERS: Initial bed elevation, suspended sediment concentration, organic matter, and rate of sea level rise.