Delft3D Flexible Mesh

in the San Francisco Bay Delta

system, California

Deltares: Arthur van Dam, Sander van der Pijl, Herman Kernkamp,

Hans Los, Valesca Harezlak, Tineke Troost, Julia Vroom

UNESCO-IHE Fernanda Achete, Ali Dastgheib, Johan Reyns, Dano

Roelvink, Mick van der Wegen,

USGS Lisa Lucas, Noah Knowles, Jan Thompson, Marissa Wulff,

Larry Brown, Bruce Jaffe and others

UCSD John Helly, Rose Martyr

500 km

California

San Francisco

Los Angeles

Sacramento

Courtesy J. Cloern

California

Delta

2

Sierra Nevada

Pacific Ocean

Courtesy J. Cloern

Characteristic river discharge

San Joaquin

Sacramento river

Bay

Water export:

- Agriculture

- Los Angeles

60 km long tunnel

10 m diameter

200 m3/s

January 13, 2014

CASCaDE project

1.3 M USD

Financed by USGS and DWR California

Scientific approach to

study climate change impact on water

quality dynamics in the Bay Delta System

Central place for Delft3D Flexible Mesh

CASCaDE II project

“…extend modeling capabilities to assess Delta ecosystem response

to changes in climate and physical configuration”

Development of Delft3D Bay Delta model for calculations with

- Water levels

- Salinity

- Sediment

- Temperature

- Fish habitat

- Phytoplankton dynamics

- Island flooding

January 13, 2014

Courtesy Mick van der Wegen

Courtesy Mick van der Wegen

Courtesy Mick van der Wegen

Bathymetry grid

In progress: Seamless Bathy-Topo (LIDAR) grid

Courtesy Mick van der Wegen

Mesh: about 200.000 grid cells

Detailed calibration

www.d3d-baydelta.com

January 13, 2014

Discharge at Rio Vista

Courtesy: Roseanne Martyr

January 13, 2014

Salinity profile in Carquinez Straight

Courtesy: Roseanne Martyr

Sacramento river water tracer

Coupling with DELWAQ

Courtesy: Hans Los & Valesca Harezlak

A DELWAQ-model was run (offline) on the same flexible mesh.

Sediment dynamics

January 13, 2014

Input

22/16

Water

Level

Mokelumne

Sacramento

San Joaquin

23/16

Calibration Stations

24/16

Calibration Stations

Calibration Stations

Unit: Thousand metric ton

(~10e8 kg per year)

Data – Sediment Flux

Model – Sediment Flux

27/16

Unit: Thousand metric ton

(~10e8 kg per year)

- 309Kt

150 Kt

15 Kt

60Kt

876

Kt

832

Kt 261 Kt

150 Kt

205 Kt

190 Kt

20 Kt

100 Kt

33 Kt

30 Kt

--

30 Kt

654

Kt

617

Kt

-

126 Kt

23%

234Kt

32%

311Kt 65%

370Kt

42%

200Kt

1,132 Kt

1,096 Kt

490 Kt

498 Kt

50%

609Kt 50%

150Kt

90Kt

60%

Data – Sediment Flux

Model – Sediment Flux

Adding heat flux model

Heat flux model input:

- Humidity (%)

- Air temperature (degree Celsius)

- Cloudiness (% blockage of solar radiation)

Started with spatially uniform HAC field, seems ok because delta

stations Sacramento and Stockton look similar (Stockton is used in

model)

10 november 2014

10 november 2014

Model set-up

- Using existing grid and water level calibration for water year 2011

(1 Oct 2010 – 1 Oct 2011)

- Replacing spatial wind fields by uniform wind measured at

Stockton (spatial field didn’t work)

- Including salinity

- Note: all temperatures are in degrees Celsius!

Temperature:

1. Adding heat flux model, modeling heat exchange between water

and air

2. Adding temperature boundaries

3. 3D modeling

Observed water temperature

10 november 2014

January 13, 2014

Results

Run10 (June, Jul, Aug)

- incl. heat flux

- temperature at boundaries (sea, Sacramento R, San Joaquin R):

5 deg C

- 2D

Heat flux model works!

Delta region is strongly affected

by temperature prescribed at

upstream boundaries.

10 november 2014

10 november 2014

10 november 2014

in my mesh

10 november 2014

in my mesh

10 november 2014

in my mesh

10 november 2014

10 november 2014

Summary

• Delft3D Flexible Mesh, which includes the new

D-Flow Flexible Mesh engine, is central model

in CASCaDE project

• Promising calibration on tidal water levels,

discharge, salinity, sediment concentration and

temperature

• Upcoming applications in phytoplankton

modeling and HABITAT

January 13, 2014

Community model : concept

January 13, 2014

Detailed calibration

www.d3d-baydelta.com

January 13, 2014

Ongoing work: the Community model

Community model : concept

January 13, 2014