Flood-inundation map and water surface profiles for floods of selected recurrence intervals, Cosumnes River and Deer Creek, Sacramento County, California

Guay, Joel R.; Harmon, Jerry G.; McPherson, Kelly R.

doi:10.3133/ofr98283

Cited by 4 publications

(1 citation statement)

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“…River inflows into the model domain were specified as mean daily flows from the gage at MHB for the Cosumnes River and estimated from a stage discharge relationship and a stage record for Deer Creek. Channel geometries were characterized using 109 cross sections from recent surveys (Guay et al 1998; Constantine 2003). Riverbed K values for each of the 109 river segments were calculated from the arithmetic mean of the vertical K values of the river cells contained within each segment.…”

Section: Methodsmentioning

confidence: 99%

River‐Aquifer Interactions, Geologic Heterogeneity, and Low‐Flow Management

Fleckenstein¹,

2006

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Low river flows are commonly controlled by river-aquifer exchange, the magnitude of which is governed by hydraulic properties of both aquifer and aquitard materials beneath the river. Low flows are often important ecologically. Numerical simulations were used to assess how textural heterogeneity of an alluvial system influences river seepage and low flows. The Cosumnes River in California was used as a test case. Declining fall flows in the Cosumnes River have threatened Chinook salmon runs. A ground water-surface water model for the lower river basin was developed, which incorporates detailed geostatistical simulations of aquifer heterogeneity. Six different realizations of heterogeneity and a homogenous model were run for a 3-year period. Net annual seepage from the river was found to be similar among the models. However, spatial distribution of seepage along the channel, water table configuration and the level of local connection, and disconnection between the river and aquifer showed strong variations among the different heterogeneous models. Most importantly, the heterogeneous models suggest that river seepage losses can be reduced by local reconnections, even when the regional water table remains well below the riverbed. The percentage of river channel responsible for 50% of total river seepage ranged from 10% to 26% in the heterogeneous models as opposed to 23% in the homogeneous model. Differences in seepage between the models resulted in up to 13 d difference in the number of days the river was open for salmon migration during the critical fall months in one given year.

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Section: Methodsmentioning

confidence: 99%