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JRB Muddy Waters A Discussion of Recent Turbidity measurements in the Delta J.R. Burau 10/10/2010 OCAP Workshop 2010
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JRB
Muddy WatersA Discussion of Recent Turbidity
measurements in the Delta
J.R. Burau
10/10/2010
OCAP Workshop 2010
(1)What we did (installation of new sites)
(2)What we learned a) Peaks in discharge and turbidity
are not coincident during first flush
c) Flooded Islands act as settling basins
d) Turbidity field is complex
(3) Data Products (web based)a) Time series package
b) Scalar field interpolations
Outline
What we did:
Installed about 12
turbidity stations
Field Team
Jim George
Jim DeRose
Jon Yokomizo
Curt
Battenfeld Brad
Sullivan
Liz
Beaulieu
JRB
Peaks in river discharge and turbidity
are not coincident during first flush
Time-Series Data – Flow and Turbidity
January-February, 2010
o~~~~~_J_~~~~~ 0 5 10 15 20 25 30 35 40 45 50
DAYS FROM JANUARY 1, 2010 JRB
Operable gates in Georgiana and in the DCC
Control turbidities in central/south Delta
through
Management Implications?
If DCC were open even bigger impact (at least double)
Effect on Western Delta net Flows from Closing Georgiana Slough?
11000 10000
"' 9000 u. 8000 " w 7000 CJ 6000 a: <( :i: 5000
" "' 4000
i5 3000 2000 1000
0
70000
60000
"' u. 50000 " w 40000 CJ a: <( 30000 :i:
" "' 20000
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Net Flows
- Georgiana Open - Geogiana Closed
A Georgiana Slough (net discharge
B Sacramento River @ Rio Vista San Joaquin River @ Jersey Pt.1 -
I
I
+6.Q(geo)
,... ..... ..... .... .... - - ..... / J
-10000 ._ __ ._ __ ._ __ ..__ __ ..__ __ ..__ __ _._ __ _._ __ _,_ __ _,_ __ _,_ __ _,_ __ _,
0 5 10 15 20 25 30 35 40 45 50 55 60 DAYS FROM JANUARY 1, 2010
(1) Need to construct gate in Georgiana
(2) DCC gates are currently closed to protect salmon
(3) Need to alter DCC closure requirement
@ Sac flows that exceed 25k cfs
Challenges to operating gates in DCC and Georgiana
to alter
Turbidity fields and Western delta hydrodynamics
Flooded Islands act like settling basins
JRB
Turbidities drop dramatically across Franks Tract
Turbidities in tlhe Franks Tract Region 400 rA~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Source: Sac R. @ Freeport Zr=
~ 300
c iii 200 a: r=
100
0 '-'-~~~-'-~~~~-'-~~~---1~~~~-'-~~~~'--~~~-'-~~~--'
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~ 50
~ 40
~ 30 ....
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20
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0 20 Q.
"' c z §; 10
Travis Air force Base
20 25
Fluvlal event
30 35 40 45 so DAYS FROM JANUARY 1, 2010
JRB: 2/19/2010
Turbidities drop dramatically across Franks Tract
::> ....
400 A
z 300
~ 0 iii 200 a: I=
100
Turbidi t ies in the Franks Tract Region (Tidally Averaged)
Source: Sac R. @ Freeport
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5or,8;-;:::====:::::ic::::====:;---.~~~---,~~~~--.---;:;:::-~---,========:::r:::=====----i
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10
- 32 NTU drop
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Travis Air orce Base
o~~~~~~~~~~~~~~~~~~
15 20 25 30 35 DAYS FROM JANUARY 1, 2010
40 45 50
Franks Tract – Tracer Dye
Conservative – numerical model
Franks Tract – Jets
Enhance mixing with ambient water - settling
Compare drop in turbidity
(a) Across channel without flooded Island (Old River)
against a ….
(b) Channel with flooded island (Middle River -Mildred Island)
Turbidity variability - Middle River
Big drop across Mildred Island
Turbidity variability - Old River
Steady decline in turbidity – no big drop
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Web Based data analysis tools
JRB
Collaboration: John Donovan (USGS), Dave Osti (34north)
Data are available in real-time
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Graph
<More> 2010/09/21 23: 00 ' 7006. 00000 Zoom I X Unlocked
Discovery RAV
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Interpolated Scalar Fields (Turbidity) Fields
Collaboration: John DeGeorge (RMA) , Dave Osti (34north)
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Turbidity (NTU)
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Next Steps in the Field
(1) Collect SSC boundary condition data
(2) Collect Acoustic Backscatter data
More reliable (less fouling), more representative
Acoustic Doppler Current Profilers (ADCP)
Ultrasonic Velocity Meter (UVM)
Flow Measurement Technologies
(2) Collect Acoustic Backscatter data
E.XPLANATl ON • Flow Sl,!il i('ln.$ wid) Son«:k AOCP·~
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Location of USGS·operated flow station sites in the Oeha Area of California.
111"15'
Questions?
