transport processes: time scale correlation between flow and scalar concentration

Transport processes:Time scale correlation between flow and scalar concentration

Chris EnrightCWEMF DSM2 Workshop

February 6, 2007

Or, how Geometry “filters” estuarine drivers (tides, river input)

Chris EnrightCWEMF DSM2 Workshop

February 6, 2007

Transport processes

• For modeling purposes, validate that DSM2 transports salt etc. for the right reason…

• Reasons: Advection and dispersion

Advective Transport

• Correlation between net flow and net scalar concentration

• Mostly from river input and spring-neap estuary fill-drain cycle

• Advective Flux = <Qt><Ct>

Dispersive Transport

• Correlation between tidal flow and tidal scalar concentration

• Driven by tide• Dispersive Flux = <Q’t*C’t>

Total Flux

• Superposition of advective and dispersive flux.

• Total Flux = advection + disperion <Qt*Ct> = <Qt><Ct> + <Q’t*C’t>• Compute with model output and field data

and compare.

Suisun Marsh and BaySuisun Marsh and Bay

First Mallard First Mallard BranchBranch

Sheldrake Sheldrake SloughSlough

First Mallard BranchFirst Mallard BranchSheldrake SloughSheldrake Slough

Suisun Slough

Suisun Slough

Comparing Comparing Sheldrake Sl. and First Mallard BranchSheldrake Sl. and First Mallard Branch

• Similar tidal prismSimilar tidal prism• Similar source waterSimilar source water• Different adjacent land useDifferent adjacent land use

First Mallard BranchFirst Mallard Branch

Suisun Slough

Suisun Slough


No LeveesNo Levees

Suisun Slough

Suisun Slough


No LeveesNo Levees

Marsh plain Marsh plain elevation iselevation is~ MHHW~ MHHW

Suisun Slough

Suisun Slough


No LeveesNo LeveesEdge of Marsh Plain is Edge of Marsh Plain is ~ 6.7 feet NAVD88~ 6.7 feet NAVD88


Suisun Slough

Suisun Slough


ADCPADCP

SondeSonde

No LeveesNo Levees


Edge of Marsh Plain is Edge of Marsh Plain is ~ 6.7 feet NAVD88~ 6.7 feet NAVD88

Suisun Slough

Suisun Slough

Sheldrake SloughSheldrake Slough

Suisun SloughSuisun Slough


Completely dikedCompletely diked



Diversion/Drain CulvertsDiversion/Drain Culverts






Moderately subsidedModerately subsidedmarsh plain dependingmarsh plain dependingon land use practiceon land use practice



ADCPADCP

SondeSonde



Moderately subsidedModerately subsidedmarsh plain dependingmarsh plain dependingon land use practiceon land use practice


MHHW

MSL

MLLW

Borrow Ditch

ManagedPond

~ Sheldrake ~ Sheldrake SloughSlough

Comparing Typical Cross-section Hypsography

Mean Sea LevelMean Sea Level

Levee

MHHW

MSL

MLLW

MHHW

MSL

MLLW

Borrow Ditch

ManagedPond

Marsh plain

~ Sheldrake ~ Sheldrake SloughSlough

~ First Mallard~ First MallardBranchBranch


Mean Sea LevelMean Sea Level

Levee

MHHW

MSL

MLLW

MHHW

MSL

MLLW

ManagedPond

Marsh plain

~ Sheldrake Sheldrake SloughSlough

~ First Mallard~ First MallardBranchBranch


Spring High TideSpring High Tide

Levee Borrow Ditch

First Mallard BranchFirst Mallard BranchSheldrake SloughSheldrake Slough

Suisun Slough

Suisun Slough

Data is flow, temperature, chlorophyll,Data is flow, temperature, chlorophyll,salt and DO flux at these locations:salt and DO flux at these locations:

Comparing Hydrodynamics

-1000

-800

-600

-400

-200

0

200

400

600 First Mallard Branch

-1000

-800

-600

-400

-200

0

200

400

600 Sheldrake Slough

15 22 29 6 13 20 27 3 10 17 24 1 8 15 22 29 5

Suisun Marsh Planning (DRAFT) Mon Oct 23 12:15:12 PDT 2006

FLO

W (c

fs)

FLO

W (c

fs)

April 2004 | May | June | July | August

Tidal FlowTidal Flow

Tidal Flow0

0

EBB (out)

EBB (out)

FLOOD (in)

FLOOD (in)

-1000

-800

-600

-400

-200

0

200

400

600 First Mallard Branch

-1000

-800

-600

-400

-200

0

200

400

600 Sheldrake Slough

15 22 29 6 13 20 27 3 10 17 24 1 8 15 22 29 5

Suisun Marsh Planning (DRAFT) Mon Oct 23 12:19:43 PDT 2006

FLO

W (c

fs)

FLO

W (c

fs)

Tidal and Net FlowTidal and Net Flow

Tidal FlowResidual “Net” Flow 0

0

EBB (out)

EBB (out)

FLOOD (in)

FLOOD (in)


Flux

(kg/

s)Fl

ux (k

g/s)

Salt FluxSalt Flux Total = Advective + Dispersive Flux Flux Flux (Spring-Neap) (Tides)

<Qt*Ct> = <Qt><Ct> + <Q’t*C’t>

EBB (out)

EBB (out)

FLOOD (in)

FLOOD (in)


Flux

(g/s

)Fl

ux (g

/s)

DO FluxDO FluxEBB (out)

EBB (out)

FLOOD (in)

FLOOD (in)


Total = Advective + Dispersive Flux Flux Flux (Spring-Neap) (Tides)


-40

-30

-20

-10

0

10

First Mallard Branch

15 22 29 6 13 20 27 3 10 17 24 1 8 15 22 29 5

-40

-30

-20

-10

0

10

Sheldrake Slough

Temperature FluxTemperature Flux


Tem

pera

ture

Flu

x (C

*m /s

)Te

mpe

ratu

re F

lux

(C*m

/s)

33

EBB (out)

EBB (out)

FLOOD (in)

FLOOD (in)

Total = Advective + Dispersive Flux Flux Flux (Spring Neap) (Tides)


Spring TideSpring TideAdvectiveAdvective FluxFlux

Flux

(g/s

)Fl

ux (g

/s)

Chlorophyll FluxChlorophyll Flux


EBB (out)

EBB (out)

FLOOD (in)

FLOOD (in)



Neap TideNeap TideAdvectiveAdvective FluxFlux

Flux

(g/s

)Fl

ux (g

/s)



EBB (out)

EBB (out)

FLOOD (in)

FLOOD (in)



Spring TideSpring TideDispersive FluxDispersive Flux

Flux

(g/s

)Fl

ux (g

/s)



EBB (out)

EBB (out)

FLOOD (in)

FLOOD (in)



Neap TideNeap TideDispersive FluxDispersive Flux

Flux

(g/s

)Fl

ux (g

/s)



EBB (out)

EBB (out)

FLOOD (in)

FLOOD (in)



Drivers(forcing mechanisms)

Outcomes(Chemical/BiologicalHabitat Characteristics)

Conceptual Model

Linkages (hydrodynamic

processes)


Outcomes(Chemical/BiologicalHabitat Characteristics)• Meteorology

• Tides

• River inputs

• Exports/ Diversions/ Drainages

Conceptual Model


processes)



• Advection

• Dispersion - network - velocity shear - tidal trapping

• Gravitational Circulation

• Meteorology

• Tides

• River inputs


Conceptual Model


processes)



Gradients of• Residence time• Salinity• Temperature• Sediment• Biota• Toxics• etc.

• Meteorology

• Tides

• River inputs


Conceptual Model


processes)

• Advection





GeometryGeometry(Like a(Like a Filter)Filter)


• Meteorology

• Tides

• River inputs


Conceptual Model


processes)

• Advection




• Meteorology

• Tides

• River inputs





Conceptual Model


processes)

• Advection







• Meteorology

• Tides

• River inputs



Conceptual Model


processes)

• Advection







Conceptual Model


• Meteorology

• Tides

• River inputs



processes)

• Advection





• Meteorology

• Tides

• River inputs





Conceptual Model


processes)

• Advection



Thank you

transport processes: time scale correlation between flow and scalar concentration

Documents

temperature flux

tidedispersive flux

cycleadvective flux

augustflux kgssalt flux

mhhwedge of marsh plain

springneap estuary

net scalar concentrationmostly

hydrodynamics flow cfs