upstream boundary (section v.1). 1. delta boundary, daily inflow 2. extend upstream channel by 45...
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Upstream Boundary
(Section V.1)
1. Delta boundary, daily inflow
2. Extend upstream channel by 45 miles, daily inflow
3. Hourly inflow at Freeport boundary
Walnut Grove
Sacramento
Rio Vista
Figure IV.1.1. Simulated stage at the upstream model boundary from three different formulations. Results are from Fischer Delta Model simulations of historical hydrology
3
5
7
9
11
13
15
17
8/4 8/19 9/3 9/18 10/3 10/18 11/2 11/17 12/2 12/17 1/11999
Sta
ge (
ft)
Case 1. Delta
Case 2. Delta extended 45 miles upstream
Case 3. Inflow BC at Frpt
Figure V.1-2. Simulated flow in Sacramento River at Freeport.
-7,500
-5,000
-2,500
0
2,500
5,000
7,500
10,000
12,500
15,000
17,500
10/24 10/25 10/26 10/27 10/28 10/29 10/30 10/31 11/1 11/2 11/3 11/4 11/5 11/6 11/71999
Flo
w (
cfs)
-6,000
-4,000
-2,000
0
2,000
4,000
6,000
8,000
10,000
12,000
14,000
Case 1. DeltaCase 3. Inflow BC at FrptDifference between Case 2. Delta extended 45 miles upstream and Case 1. DeltaDifference between Case 3. Inflow BC at Frpt and Case 1. Delta
a.
b.
a.
Difference (cfs)
b.
Figure V.1-5. Simulated combined flow into Delta Cross Channel and Georgiana Slough.
-10,000
-7,500
-5,000
-2,500
0
2,500
5,000
7,500
10,000
12,500
10/24 10/25 10/26 10/27 10/28 10/29 10/30 10/31 11/1 11/2 11/3 11/4 11/5 11/6 11/71999
Flo
w (
cfs)
-2,500
-1,250
0
1,250
2,500
3,750
5,000
6,250
7,500
8,750
Case 1. DeltaDifference between Case 2. Delta extended 45 miles upstream and Case 1. DeltaDifference between Case 3. Inflow BC at Frpt and Case 1. Delta
a.b.
a.
Difference (cfs)
b.
Positive flow is away from Sacramento River.
Observations – Upstream Boundary
• Current formulation may have significant stage error at Walnut Grove
• A 45 mile extension matches flow at Freeport reasonably well, even if only daily inflow is used