dsm2 analysis of water level and water quality in the south delta presented to california water and...
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DSM2 Analysis of Water Level and Water Quality in the South Delta
Presented toCalifornia Water and Environmental
Modeling Forum February 26, 2007
Fingerprinting and Particle Tracking
Analysis
Background
• Concerns with water levels and low flow conditions in the South Delta in current SDIP studies
• Previously demonstrated that modified barrier operations could alleviate low water level and stagnation events
• Current investigation focuses on more stringent definition of flow concern in Old River and use of fingerprinting and visualization tools
Compliance Locations
Flow onlyFlow only
Flow / WLFlow / WL
Definition of Violations
• Water Level Violation – Daily minimum stage < 0 ft MSL
• Flow Violation – 3 day average flow – < 50 cfs in MR and GLC– < 100 cfs in OR
Plan C Gate Operations and Circulation Patterns at Low Flow (<2500 cfs)
Net Flow
Flood Flow
Ebb Flow
Revised Circulation Patterns at Low Flow, (when Plan C Ops result in flow violations)[TO 5]
Net Flow
Flood Flow
Ebb Flow
Summary of Changes to Plan C Barrier Operations
15 Min Flows South Delta July 1985
-6,000
-5,000
-4,000
-3,000
-2,000
-1,000
0
1,000
2,000
3,000
4,000
07/06/85 00:00 07/07/85 00:00 07/08/85 00:00 07/09/85 00:00
OR
and
MR
Flo
ws
(cfs
)
GLC_W_DS_BAR
MIDR_DS_BAR
OLDRT_DS_BAR
Under CH2M HILL revisions, GLC is closed to downstream flow (7/7/85) in order to shift water
to Old River and Middle River.
Standard SDIP gate operation lets flood tide enter Middle River and Old River, but does not
let ebb tide out (net flow is upstream).
Violations Summary (April to November only)
RUN Days with Water Level Violations
Low Flow Violations Total Violations
Grant Line Canal Up-stream of East Barrier (206)
Middle River at Mowry (126)
Old River at Tracy Road Bridge (71)
Grant Line Canal Down-stream of West Barrier (213)
Grant Line Canal Up-stream of East Barrier (206)
Middle River at Mowry (126)
Middle River Up-stream Barrier (133)
Old River near Tracy Up-stream of Barrier (79)
Old River at Tracy Road Bridge (71)
Step 1 (Base Line)
17 18 82 10 2 256 160 0 27 572
50 cfs OR
Trigger[TO2]
0 0 0 1 1 0 2 0 2 6
100 cfs OR
Trigger [TO5]
0 1 0 0 0 4 0 5 1 11
* In TO2, 50 cfs rule was applied even in OR
Fingerprinting Analysis
• Two planning simulations:– Temporary Barriers– CH2M HILL Modified Plan C
• Volumetric and Constituent Analysis– Volumetric Analysis provides origin of water at
any point through time on a fractional basis– Constituent Analysis provides origin of salt (EC)
at any point through time on a fractional basis
Volumetric Fingerprinting Analysis:Old River
Fingerprint at Old River near Tracy downstream of Barrier Permanent Barriers (CH)
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
O-8
7
J-88
A-8
8
J-88
O-8
8
J-89
A-8
9
J-89
O-8
9
J-90
A-9
0
J-90
O-9
0
J-91
A-9
1
J-91
Perc
ent o
f Wat
er b
y So
urce
DICU Mtz Sac SJR
Fingerprint at Old River near Tracy downstream of Barrier Temporary Barriers
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
O-8
7
J-88
A-8
8
J-88
O-8
8
J-89
A-8
9
J-89
O-8
9
J-90
A-9
0
J-90
O-9
0
J-91
A-9
1
J-91
Perc
ent o
f Wat
er b
y So
urce
DICU Mtz Sac SJR
Volumetric Fingerprinting Analysis:Middle River
Fingerprint at Middle River Downstream of BarrierTemporary Barriers
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
O-8
7
J-88
A-8
8
J-88
O-8
8
J-89
A-8
9
J-89
O-8
9
J-90
A-9
0
J-90
O-9
0
J-91
A-9
1
J-91
Perc
ent o
f Wat
er b
y So
urce
DICU Mtz Sac SJR
Fingerprint at Middle River Downstream of BarrierPermanent Barriers (CH)
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
O-8
7
J-88
A-8
8
J-88
O-8
8
J-89
A-8
9
J-89
O-8
9
J-90
A-9
0
J-90
O-9
0
J-91
A-9
1
J-91
Perc
ent o
f Wat
er b
y So
urce
DICU Mtz Sac SJR
Summary of Period-Averaged Contribution from Various Sources
Sacramento River (%)
San Joaquin River (%)
Delta Islands (%)
Location Temporary Barriers
Permanent Gates
Temporary Barriers
Permanent Gates
Temporary Barriers
Permanent Gates
MR DS Barrier 29 39 56 51 14 9
OR Tracy 21 46 67 43 12 10
GLC DS Barrier 16 21 79 71 5 7
Banks PP 58 57 32 34 8 8
Tracy PP 42 44 50 48 7 8
Summary of EC Results:DICU Influence in Middle River
Monthly Avg EC Source Comparison at Middle River DS
of the barrier
-40
-20
0
20
40
60
80
100
Oct-75 Oct-76 Oct-77 Oct-78 Oct-79 Oct-80 Oct-81 Oct-82 Oct-83 Oct-84 Oct-85 Oct-86 Oct-87 Oct-88 Oct-89 Oct-90
Date
Perc
ent E
C (%
)TempBarriers DICU
PermBarriers DICU
DICU Difference (PermBarriers - TempBarriers)
Particle Tracking Analysis
• Three simulation periods:– July/August 1985 – consistent with DWR Delta
Modeling analysis– April/May 1987 – VAMP period– June/July 1988 – Extremely low SJR, exports
• Three DSM2 Simulations:– Temporary Barriers– CH2M HILL Modified Plan C– DWR Modified Plan C – (All runs have consistent BCs with updated SJR flows)
Cumulative Flows: Old River
Old River Flows - July 1985
-400,000
-300,000
-200,000
-100,000
0
100,000
200,000
300,000
400,000
7/1/
85
7/2/
85
7/3/
85
7/4/
85
7/5/
85
7/6/
85
7/7/
85
7/8/
85
7/9/
85
7/10
/85
7/11
/85
7/12
/85
7/13
/85
7/14
/85
7/15
/85
7/16
/85
7/17
/85
7/18
/85
7/19
/85
7/20
/85
7/21
/85
7/22
/85
7/23
/85
7/24
/85
7/25
/85
7/26
/85
7/27
/85
7/28
/85
7/29
/85
7/30
/85
7/31
/85
Flow
(cfs
)Temp Barriers;Cumulative flow
SDIP; Cumulative FlowCH SDIP;Cumulative Flow
CH-SDIP Gate Changes:July 7th, 10th, 13th,
22nd, and 25th
Conclusions
• Flexible SDIP gates shown to effectively manage water level and flow
• Sacramento River influence in South Delta Channels is significantly increased with Permanent Barriers
• Particle Tracking simulations demonstrate the potential of flushing flows in Middle and Old River
• Results indicate that one-day flushing flows are not likely to traverse entire length of Middle or Old River; sustained flows are required
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