Hydrologic Engineering Center HEC-ResSim Enhancements Better Tools to Simulate the Operation of...

Hydrologic Engineering Center

HEC-ResSimHEC-ResSimEnhancementsEnhancements

Better Tools to Simulate the Operation Better Tools to Simulate the Operation of California Reservoirsof California Reservoirs

Joan KlipschCWEMF Annual Meeting

February 2007


OutlineOutline

• HEC-ResSim Basics– Development Objectives– The System Schematic– Rule-Base Operations Definition– New Features in Version 3.0

• The Yuba-Feather F-CO Study– Participants– Objective– MOA– Requested Enhancements for Version 3.1


ResSim Development GoalsResSim 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


The Physical SystemThe Physical System

• Graphical System Schematic– Reservoirs– Reaches– Junctions– Diversions – Diverted Outlets

• Hierarchical Multiple Outlet Structure– Controlled and Uncontrolled Outlets– Power Plants– Pumps– Outlet Groups


System SchematicSystem Schematic


Rule-Based Reservoir Rule-Based Reservoir OperationsOperations

• 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.


Rule-Based Reservoir Rule-Based Reservoir OperationsOperations

• RulesA 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


Zone-Based Prioritized Rule SetZone-Based Prioritized Rule Set


Basic Decision LogicBasic Decision Logic

1. Determine the… Allowable Range of Releases

– Physical Capacity defines the initial range

– Rules narrow the range

2. Determine the… Desired Guide Curve Release

– How much the reservoir should store or release to get back to guide curve in this timestep

Allo

wable

range o

f re

lease

s (c

fs)

0

15,000

10,000

5,000

1 2 30: Physical Capacity1: IROC - 3000 cfs2: Max Release - 10,000 cfs 3: Min Release – 700 cfsAllowable Range: 700-8000 Allowable Range: 700-8000 cfscfs


Basic Decision Logic, Cont’d.Basic Decision Logic, Cont’d.

3. Decide !

?Is the Desired Guide-Curve release within the allowable range?

Yes Make the Desired GC release

No Make the allowable release that is closest to the Desired GC release.


OtherOther Important Important Operations FeaturesOperations Features

• Tandem and Parallel System Operations– With variable storage balancing definition

• Conditional (If-then-else) Rule Activation• Release Allocation – Outlet Prioritization• User Scripted Rules & State Variables• Outlet Outages & Capacity Overrides


Tandem & Parallel Tandem & Parallel System OperationsSystem Operations

• Tandem–El Vado to Abiquiu–Abiquiu to Cochiti

• Parallel–Cochiti & Jemez


System Balance DefinitionSystem Balance Definition


Conditional Rule Use Conditional Rule Use Atwood & Leesville “watch” Dover – Atwood & Leesville “watch” Dover –

Not true TandemNot true Tandem


Conditional Rule UseConditional Rule UseIf-then-else blocksIf-then-else blocks


Release AllocationRelease 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


Storage Integration SchemeStorage 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


TrialsTrials

• Simulation ‘copies’ of an alternative

• Provides extended “what-if” analysis


New Development – FY07New 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…


Forecast-Coordinated OperationsForecast-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


Forecast-Coordinated OperationsForecast-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


Yuba-Feather F-COYuba-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.


Identified EnhancementsIdentified Enhancements

• Phase 1– Downstream operation must respect rate-of-

change 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


Identified EnhancementsIdentified 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…


MOA with HECMOA with HEC

• Yuba County Water Agency– 1+ year in development– Effort failed over liability issues

• NWS– 3-6 months in development– Success!


Additional RequirementsAdditional Requirements

• NWS-RFS integration– Hot-start Feature– Headless Operation – Port to Linux


Downstream Ops & Downstream Ops & Rate-of-Change - CurrentRate-of-Change - Current


Downstream Ops & Downstream Ops & Rate-of-Change - NewRate-of-Change - New


Flow Contingency for Downstream Operation

Contingency %Cum. Local Flow (cfs)

CancelOK

Constant Contingency Percentage (%)

Contingency Percentage as a function of Cumulative LocalFlow

New - Contingency FactorNew - 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.


Contingency FactorContingency Factor


New - Inflow MultipliersNew - Inflow Multipliers

Inflow MultipliersInflow Multipliers

CancelApplyOk

Global Multiplier

Multipliers by Location

1

The Inflow Mulitplier(s) will be applied to each inflow time series to increase or decrease the entering flows.

VillanovaRockville

River PointeGreenfield

Crazy Mt. Inflow JCTBethesdaJunction

Villanova Local InflowRockville Local Inflow

River Pointe Local InflowGreenfield Local InflowCrazy Mt. Local InflowBethesda Local Inflow

Local Flow Name

111121

Multiplier

Restore Defaults Show Product


More Info…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


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Hydrologic Engineering Center HEC-ResSim Enhancements Better Tools to Simulate the Operation of...

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