SIMULATED CHANNEL MIGRATION ( ) NEAR RIVER MILES 197 TO 191 OF THE SACRAMENTO RIVER Eric W. Larsen Dept. of Environmental Design University.

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SIMULATED CHANNEL MIGRATION (2007-2057) NEAR RIVER MILES 197 TO 191 OF THE SACRAMENTO RIVER Eric W. Larsen Dept. of Environmental Design University of California, Davis September 29, 2008

Repeat meander migration modeling Rerun 2004 model of RM 191 to 197 Use 2007 centerline as beginning time 50 year simulations In a conference call of June 19, 2008, it was agreed that Eric Larsen would “rerun the model with the 2007 alignment changes both downstream and upstream of the Rock Toe Project to see how that would affect placement of a new pumping plant.”

Aerial photographs of the channel taken in 2007 were used to digitize the banklines (Nelson 2008, Pers. Com.). From the digitized banklines, a channel centerline was determined.

Summary Two simulations identical except different starting centerlines. On the scale of the modeling, no significant differences. Using 2007 centerline would only give small difference over 50 years of modeling. The main goal of the modeling was to determine if using a 2007 centerline would result in significantly different results in where the channel would migrate in 50 years. The centerline predictions near the area of concern where the pumps are located do not show a significant difference. The conclusions in the previous reports (Larsen and Cui 2004, Larsen 2005b, a. 2006, 2007) would be the same using the new data.