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Working with D-Flow Flexible Mesh in the San Francisco Estuary

Gerben de Boer, Arthur van Dam, Ali Dastgheib, Edwin Elias, Bruce Jaffe, Bert Jagers, Noah Knowles, Herman Kernkamp,

Hans Los, Lisa Lucas, Dano Roelvink, Mick van der Wegen and others

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500 km

California

San Francisco

Los Angeles

Sacramento

Courtesy J. Cloern

California

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Delta

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San F

ranci

sco B

ay

Sacramento R. San Joaquin R.

Sierra Nevada

Pacific Ocean

Courtesy J. Cloern

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San Joaquin

Sacramento river

Bay

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Characteristic river discharge

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Water export

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San Francisco Estuary

in the 1980s

• Area: ~1200 km2 • Average depth: 7 m• Median depth: 3 - 4 m• Deepest point: ~120 m (Golden Gate)

San Pablo Bay

Central Bay

Suisun Bay

South BayJaffe 2009

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San Pablo Bay

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Cascade project

• 1.3 M USD• Financed by USGS and DWR California• Scientific approach to

study climate change impact on water quality dynamics

• Central place for D-Flow Flexible Mesh

12 12October 12, 2010

Flexibility: Orthogonal curvilinear grids + triangles + pentagons+…

13 13October 12, 2010

Flexibility: Orthogonal curvilinear grids + triangles + pentagons+…

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High Qr

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High Qr Low Qr P

umpi

ng

N

o pu

mpi

ng

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Calibration periods

• Dec 16 1999 - Mar 16 2000 (high Q)

• Jul 16 2001 – Oct 16 2001 (low Q)

Water level plots at GGT

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WL Amplitudes

South bayNorth bay up to Sacramento

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Phases

South bayNorth bay up to Sacramento

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D region

A region

B region

C regionE region

F region

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landward

Water level amplitudes Deltamodel measurement

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Modeling Scenarios CasCade 2

Impact of • Changing river flow (100 years)• Sea level rise (100 years)• Anthropogenic acts (10 years)

on• SSC and morphodynamics• Selenium contamination• Valve distribution and contamination• Phytoplankton growth

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California water system moves water north to

south

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Biological Opinions Restrict Southerly Flows

SWP PumpsCVP Pumps

Stockton

Sacramento

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System Vulnerabilities

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Below Sea Level-8 -6 -3 -1 m

Land SubsidenceDue to Farming & Peat Soil Oxidation

-6.1 M (- 20 ft.)

-1.5 M (- 5 ft.)

- 4.6 M (- 15 ft.)

- 7.6 M (- 25 ft.)

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SJ River

SJ RiverSWP PumpsSWP PumpsCVP PumpsCVP Pumps

Sac RiverSac River

StocktonStockton

SacramentoSacramento

Bay Delta Conservation PlanConveyance options

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East Canal ~ $8 billion *

West Canal ~ $9 - 11 billion *

All Tunnel ~ $10 -12 billion *

BDCP New Delta Conveyance Cost Analysis

Bay-Delta Conservation Plan

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Preliminary Subject to RevisionThanx to Peter Wijsman (Arcadis) for slides

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Fin