Suisun Marsh Salinity Control Gate: Purpose, Operation, and Hydrodynamics/Salinity Transport Effect
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1 Suisun Marsh Salinity Control Gate: Purpose, Operation, and Hydrodynamics/Salinity Transport Effect CWEMF February 28, 2008 Chris Enright DWR
2 Summary SMSCG purpose, components, operation Suisun Marsh/Bay hydrodynamics SMSCG effect on Marsh/Bay salinity & X2 Frequency of SMSCG operation
3 Suisun Marsh and Bay Suisun Marsh Salinity Control Gate (SMSCG) Wetlands and Water Resources- S. Siegel
4 SMSCG Purpose Guiding Conceptual Model: Reduced outflow increases salinity. Increased salinity reduces waterfowl food plant abundance and diversity. SMSCG Purpose: Reduce salinity in Suisun Marsh to help mitigate the impacts of the water projects Wetlands and Water Resources- S. Siegel
5 SMCSG: Tidal pump induces a net downstream flow (~2,800 cfs). Opens on ebb tide Closes on flood tide Wetlands and Water Resources- S. Siegel
6 SMSCG Components Downstream Roaring River Roaring River fish screen 3 Radial Gates (108 ) 36 Stop logs (120 ) Boat lock (20 )
7 Salinity Standard Compliance Locations Both regulatory and contractual
8 Looking Upstream (southeast) Gates Open Stop Logs Out
9 Looking ~Upstream (east) Gates Open Stop Logs Installed
10 Acoustic Velocity Meter Used to trigger gate closure at -0.1 fps velocity AVM Piles
11 SMSCG Boat Lock (looking downstream - flood tide)
12 SMSCG Boat Lock (looking upstream - flood tide)
13 Suisun Marsh Salinity Control Gate Configurations June September SMSCG Not Operating Lock Open October May (when needed to meet standards) SMSCG Operating
14 Downstream SMSCG Side View Gates Open In operation: Closes on flood tide when current > -0.1 fps Open on ebb tide when upstream water level is 0.3 ft > downstream water level
15 Downstream SMSCG Side View Ebb Gates Closing
16 Downstream SMSCG Side View Gates Closing
17 Downstream SMSCG Side View Gates Closing
18 Downstream SMSCG Side View Slack Tide Gates Closing
19 Downstream SMSCG Side View 0.1 fps Slack Tide Gates Closing
20 Downstream SMSCG Side View Flood Gates Closed
21 Downstream SMSCG Side View Flood Gates Closed
22 Downstream SMSCG Side View Flood Gates Closed
23 Downstream SMSCG Side View End of Flood Gates Opening
24 Downstream SMSCG Side View Gates Opening
25 Downstream SMSCG Side View Gates Opening
26 Downstream SMSCG Side View Gates Open
27 Downstream SMSCG Side View
28 Downstream SMSCG Side View
29 Downstream SMSCG Side View
30 Downstream SMSCG Side View
31 Downstream SMSCG Side View
32 Tidal Time Scale Flows 400,000 cfs 200,000 cfs
33 Tidal Time Scale Flows Suisun Slough +/-10,500 cfs Montezuma Slough +/-63,000 cfs Montezuma Slough +-5,500 cfs 400,000 cfs 200,000 cfs
34 Tidal Time Scale Flows Hill Slough cfs Sheldrake Sl cfs First Mallard Branch cfs Suisun Slough +/-10,500 cfs Montezuma Slough +/-63,000 cfs Nurse Slough +-12,000 cfs Montezuma Slough +-5,500 cfs 400,000 cfs 200,000 cfs
35 Tidal Time Scale Excursion 1 mile Release Drifter (slack after flood) End (slack after ebb) Ebb Tide Drifter Tracks (one ~6 hour ebb tide) 400,000 cfs 200,000 cfs
36 200 6 Ebb Tidal Time Scale Flows Tidal Flow Net Flow TCFS Flood SMSCG operating Measured here (Oltmann 1998)
37 Sub-tidal Time Scale ( Net( Net ) ) Flows Typical Fall conditions (low outflow) ~2-8,000 cfs Delta Outflow Index
38 Sub-tidal Time Scale ( Net( Net ) ) Flows Typical Fall conditions (low outflow) Suisun Marsh sloughs have small net flow Suisun Slough ~ 0 cfs Montezuma Slough ~ 0 cfs Montezuma Slough ~ 0 cfs (SMSCG open) ~2-8,000 cfs Delta Outflow Index
39 Sub-tidal Time Scale ( Net( Net ) ) Flows Typical Fall conditions (low outflow) Suisun Marsh sloughs have small net flow SMSCG induces net downstream flow of ~ 2,800 cfs Suisun Slough ~ 0 cfs Montezuma Slough ~ 0 cfs Montezuma Slough +2,800 cfs (SMSCG operating) ~2-8,000 cfs Delta Outflow Index
40 Sub-tidal Time Scale ( Net( Net ) ) Flows Typical Fall conditions (low outflow) Suisun Marsh sloughs have small net flow SMSCG induces net downstream flow of ~ 2,800 cfs SMSCG affects Marsh and Bay salinity field Suisun Slough ~ 0 cfs Montezuma Slough ~ 0 cfs Montezuma Slough +2,800 cfs (SMSCG operating) ~2-8,000 cfs Delta Outflow Index
41 Salinity Response to SMSCG Operation S64 15 SMSCG SC (mmhos/cm) SC (mmhos/cm) Gates Open Gates Operating S49 Beldons Landing Gates Open S42 S21 S
42 19 17 A96 SMSCG effect on Montezuma Slough Average salinity gradient one day before SMSCG operation S54 S49 Beldons Landing N SC mmhos/cm S54 Outflow Index Before Op After Op yr S49 Average salinity gradient 10 days after SMSCG Operation Salinity transect depicted in plot Suisun Marsh S71 SMSCG C Kilometers upstream from A96 (western Suisun Bay) A96 S64 S71 S64 C2
43 30 Martinez SMSCG effect on Suisun Bay N 25 Average salinity gradient one 10 days after SMSCG operation Suisun Marsh Suisun Marsh 20 SC mmhos/cm Outflow Index Before Op After Op Port Chicago Martinez Chipps Is Average salinity gradient 1 day before SMSCG Operation Pt Chicago SMSCG Salinity transect depicted in plot Collinsville Chipps Is Collinsville Antioch yr Kilometers upstream from Martinez Antioch Shift in X2
44 SMSCG Open SMSCG Operating (Spring) SMSCG Operating (Fall-Winter) Courtesy Wim Kimmerer
45 SMSCG Operation Frequency Versus Outflow Number of Gate Operation Days Drought Years Salmon Passage Study Years Post NOAA Fisheries Agreement Average OCT-NOV-DEC Outflow
46 Number of Gate Operation Days SMSCG Operation Frequency Versus Outflow Drought Years Post NOAA Fisheries Agreement Average Jan through May Outflow
47 Thank You Paul Massera Jim Sung Kate Le Brad Tom
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