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Open water area Franks Tract - PowerPoint PPT Presentation


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Open water area Franks Tract. Problem statement. Model assumes uniform and instantaneous mixing over entire open water area Significant salinity gradient within Recent field measurements allow the possibility of estimating potential error.

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Presentation Transcript
slide1

Open water area

Franks Tract

problem statement
Problem statement
  • Model assumes uniform and instantaneous mixing over entire open water area
  • Significant salinity gradient within
  • Recent field measurements allow the possibility of estimating potential error
slide3

Figure III.3-1. US Geological Survey monitoring stations in and surrounding Franks Tract, April to August 2002.

Old River at San Joaquin River

Fisherman’s Cut

False River

Franks Tract West, FRW

Old River at Mandeville Island

Taylor Slough

Franks Tract East, FRE

Sand Mound Slough

Holland Cut

first estimate of error in salt flux calculation
First estimate of error in salt flux calculation:

Compare salt fluxes based on measured flows and salinity of:

  • Average of FRE and FRW
  • Actual salinity measured in channels
  • Caveats:
  • Modeled salinity could be different
  • Volume between salinity stations in channel and perimeter of Franks Tract.
slide6

Figure III.3.i-9. Tidally-averaged salt flux.

b. Sum of Old River at Mandeville Island and Holland Cut

Godin-filtered and in units of acre-feet • PSU

slide7

Figure III.3.i-9. Tidally-averaged salt flux.

c. False River

Godin-filtered and in units of acre-feet • PSU

observations
Observations

Possible large percentage error in salt flux estimates

Other sources of inaccuracies:

  • uniform water level
  • vertical stratification
  • gate-type formulation

Alternate formulations

  • as wide channels
  • as multiple basins