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HEC-ResSim Enhancements

HEC-ResSim Enhancements. Better Tools to Simulate the Operation of California Reservoirs. Joan Klipsch CWEMF Annual Meeting February 2007. Outline. HEC-ResSim Basics Development Objectives The System Schematic Rule-Base Operations Definition New Features in Version 3.0

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HEC-ResSim Enhancements

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  1. HEC-ResSimEnhancements Better Tools to Simulate the Operation of California Reservoirs Joan Klipsch CWEMF Annual Meeting February 2007

  2. Outline • 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

  3. 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

  4. The Physical System • Graphical System Schematic • Reservoirs • Reaches • Junctions • Diversions • Diverted Outlets • Hierarchical Multiple Outlet Structure • Controlled and Uncontrolled Outlets • Power Plants • Pumps • Outlet Groups

  5. System Schematic

  6. 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.

  7. 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

  8. Zone-Based Prioritized Rule Set

  9. Allowable range of releases (cfs) 15,000 1 2 3 10,000 0: Physical Capacity 1: IROC - 3000 cfs 2: Max Release - 10,000 cfs 3: Min Release – 700 cfs Allowable Range: 700-8000 cfs 5,000 0 Basic Decision Logic • Determine the… Allowable Range of Releases • Physical Capacity defines the initial range • Rules narrow the range • Determine the… Desired Guide Curve Release • How much the reservoir should store or release to get back to guide curve in this timestep

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

  11. Other Important Operations 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

  12. Tandem & Parallel System Operations • Tandem • El Vado to Abiquiu • Abiquiu to Cochiti • Parallel • Cochiti & Jemez

  13. System Balance Definition

  14. Conditional Rule Use Atwood & Leesville “watch” Dover – Not true Tandem

  15. Conditional Rule UseIf-then-else blocks

  16. 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

  17. 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

  18. Trials • Simulation ‘copies’ of an alternative • Provides extended “what-if” analysis

  19. 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…

  20. 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

  21. 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

  22. 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.

  23. Identified 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

  24. 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…

  25. MOA with HEC • Yuba County Water Agency • 1+ year in development • Effort failed over liability issues • NWS • 3-6 months in development • Success!

  26. Additional Requirements • NWS-RFS integration • Hot-start Feature • Headless Operation • Port to Linux

  27. Downstream Ops & Rate-of-Change - Current

  28. Downstream Ops & Rate-of-Change - New

  29. 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.

  30. Contingency Factor

  31. New - Inflow Multipliers

  32. Hydrologic Engineering Center 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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