Transcript Introducing HEC-ResSim

HEC-ResSim
Enhancements
Better Tools to Simulate the Operation
of California Reservoirs
Joan Klipsch
CWEMF Annual Meeting
February 2007
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Outline
• HEC-ResSim Basics
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Development Objectives
The System Schematic
Rule-Base Operations Definition
New Features in Version 3.0
• The Yuba-Feather F-CO Study
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Participants
Objective
MOA
Requested Enhancements for Version 3.1
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ResSim Development Goals
• Represent the physical system as realistically
as possible.
• Reproduce the decision making process that
reservoir operators use to set releases.
• Support Multi-Purpose Operation Schemes
– Represent both Flood Control Constraints &
Conservation Goals
– Support low flow & drought operation
– Support environmental restoration investigations
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The Physical System
• Graphical System Schematic
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Reservoirs
Reaches
Junctions
Diversions
Diverted Outlets
• Hierarchical Multiple Outlet Structure
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Controlled and Uncontrolled Outlets
Power Plants
Pumps
Outlet Groups
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System Schematic
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Rule-Based Reservoir
Operations
• Guide-Curve
– The seasonally-variable Desired Pool Elevation
– Basic Guide Curve Operation:
“Release or store to get back to guide curve.”
• Zones
– Zones partition reservoir storage among different
purposes.
– A prioritized set of rules within each zone limits or
overrides basic guide curve operation.
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Rule-Based Reservoir
Operations
• Rules
A rule is an objective for, or constraint on, the
operation of a reservoir or system of reservoirs.
Rule Types:
– Flexible Local & Downstream Flow Objectives
– Release or Pool Elevation Rates of Change
– Emergency Gate Regulation & Induced Surcharge
– Local and System Hydropower Requirements
– Tandem Operation
– Pump-back Schedule
– User-scripted rules
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Zone-Based Prioritized Rule Set
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1. Determine the…
Allowable Range of Releases
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Physical Capacity defines the
initial range
Rules narrow the range
2. Determine the…
Desired Guide Curve Release
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How much the reservoir
should store or release to get
back to guide curve in this
timestep
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Allowable range of
releases (cfs)
Basic Decision Logic
15,000
10,000
5,000
0
1 2 3
0: Physical Capacity
1: IROC - 3000 cfs
2: Max Release - 10,000 cfs
3: Min Release – 700 cfs
Allowable Range: 700-8000 cfs
Basic Decision Logic, Cont’d.
3. Decide !
?
Is the Desired GuideCurve release within
the allowable range?
Yes Make the Desired GC
release
No
Make the allowable release that is
closest to the Desired GC release.
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Other Important
Operations Features
• Tandem and Parallel System Operations
– With variable storage balancing definition
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Conditional (If-then-else) Rule Activation
Release Allocation – Outlet Prioritization
User Scripted Rules & State Variables
Outlet Outages & Capacity Overrides
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Tandem & Parallel
System Operations
• Tandem
–El Vado to Abiquiu
–Abiquiu to Cochiti
• Parallel
–Cochiti & Jemez
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System Balance Definition
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Conditional Rule Use
Atwood & Leesville “watch” Dover –
Not true Tandem
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Conditional Rule Use
If-then-else blocks
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Release Allocation
• To provide control over how the releases
are allocated to the available outlets
• Two methods
– Balanced
• Even Balance (default)
• Un-even Balance – e.g. 60-40 split
– Sequential
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Storage Integration Scheme
• Solution to the problem that occurs
when a reservoir has:
– Small storage
– Large outlet capacity
– More inflow than can be stored during a
time-step
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Trials
• Simulation ‘copies’ of
an alternative
• Provides extended
“what-if” analysis
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New Development – FY07
• R&D Funded
– Routing Enhancement for Downstream Ops
– Tailwater-Dependent Outlet Capacity
– Technical Reference Manual
• Project Funded
– LCRA
• Projected Pool Operation
– Yuba-Feather F-CO Study…
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Forecast-Coordinated Operations
• Yuba-Feather Watershed
– Oroville
- Operated by CA DWR
– New Bullards Bar - Operated by Yuba County
Water Agency
• Study Objectives
– Develop a way to coordinate flood control
releases from the two reservoirs, at the same
time maintaining channel flow at or below the
channel capacity at Marysville
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Forecast-Coordinated Operations
• Study Team
– Yuba County Water Agency
– California Dept. of Water Resources
– NWS CA-NV River Forecasting Center
– Advisory: Sacramento District, USACE
• Funding
– (new) Prop 13 Grant
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Yuba-Feather F-CO
• SPK Water Management was consulted
on existing models for the basin.
• Study team chose ResSim for the
operations modeling tool.
• SPK & Study Team identified some
modifications that would be needed to
effectively represent the watershed.
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Identified Enhancements
• Phase 1
– Downstream operation must respect rate-ofchange constraints
– Improve Induced Surcharge operation algorithm
to remove oscillations
– Induced Surcharge function inadequate to
represent ESRD operations.
• Provide option to enter ESRD curves directly
• Add a “Hold the Gate” option for falling pool operation
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Identified Enhancements
• Phase 1, cont’d.
– Add a variable contingency factor to the
downstream control rule to represent uncertainty
in the inflow forecast
– Add a inflow factor editor to facilitate
development of “what-if” inflow scenarios
• Phase 2
– Add ensemble management to alternative
development
– Add ability to impact operations based on
probability…
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MOA with HEC
• Yuba County Water Agency
– 1+ year in development
– Effort failed over liability issues
• NWS
– 3-6 months in development
– Success!
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Additional Requirements
• NWS-RFS integration
– Hot-start Feature
– Headless Operation
– Port to Linux
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Downstream Ops &
Rate-of-Change - Current
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Downstream Ops &
Rate-of-Change - New
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New - Contingency Factor
• Effective space at the
downstream control location
is computed as the difference
between the downstream limit
modified by the contingency
percentage and the
cumulative local flow.
• For a downstream maximum
flow rule, the downstream
limit is multiplied by (1 –
contingency percentage/100),
resulting in a reduced
maximum limit.
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Flow Contingency for Downstream Operation
Constant Contingency Percentage (%)
Contingency Percentage as a function of Cumulative Local
Flow
Cum. Local Flow (cfs)
Contingency %
OK
Cancel
Contingency Factor
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New - Inflow Multipliers
Inflow Multipliers
The Inflow Mulitplier(s) will be applied to each inflow time series to
increase or decrease the entering flows.
Global Multiplier
1
Multipliers by Location
Junction
Bethesda
Crazy Mt. Inflow JCT
Greenfield
River Pointe
Rockville
Villanova
Restore Defaults
Show Product
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Local Flow Name
Bethesda Local Inflow
Crazy Mt. Local Inflow
Greenfield Local Inflow
River Pointe Local Inflow
Rockville Local Inflow
Villanova Local Inflow
Ok
Apply
Multiplier
1
2
1
1
1
1
Cancel
More Info…
• Version 3.0, Release
March 2007 !!!
• HEC’s Web Site:
www.hec.usace.army.mil
• HEC’s ResSim Point of Contact:
Joan D. Klipsch
Hydrologic Engineering Center
Hydrologic Engineering Center