Programme  Poster session 3  abstract 761

Multi-objective Optimization of Water Resource Systems using HEC- ResPRM

Author(s): Beth Faber, Julien Harou, Sara O’Connell
US Army Corps of Engineers, Institute for Water Resources, Hydrologic Engineering Center, CEIWR-HEC, 609 Second Street, Davis, California, USA 95616.

Keyword(s): multi-objective optimization, reservoir systems, systems analysis, water resource planning and management, HEC-PRM, HEC-ResPRM, network flow optimization

Poster: abs761_poster.pdf
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Session: Poster session 3
AbstractHEC-PRM (“Prescriptive Reservoir Model”) is a

generalized computer program that performs deterministic network-flow optimization of reservoir system operations.

PRM “prescribes” optimal values of flow and storage over time that minimize penalty functions at selected locations

in the water resource network. Penalty functions associate a penalty or reward (negative penalty) with levels of flow

or storage. For environmental restoration, flow and storage levels that deviate widely from natural levels can be

penalized, thus suggesting system operations closer to the natural regime. Optimization with a Network Flow with

Gains algorithm enables relatively fast run times for large systems but restricts constraints to capacity limits and flow

continuity at nodes. PRM has been applied to several large multi-reservoir systems in the U.S. such as the Columbia

River System, the Missouri River System, the Mississippi Headwaters, and the state-wide water resource network

of California.

HEC-ResPRM is a new software environment for PRM designed to facilitate modeling for

data-intensive single or multi-objective reservoir system operation studies. The environment is in large part shared

with HEC-ResSim – a reservoir system simulation tool. The integration of PRM into the HEC-Res modeling

platform was made to enable the joint development and use of simulation and optimization models. Central to the

software’s graphical user interface is a network display of the water system underlain by an optional map or image of

the area. Properties of system elements can be edited directly in the network display and time series of results

plotted for any network element. The multi-objective nature of water resource problems is addressed by allowing

any number of penalty functions (including those with differing units) to be added at any network location. A penalty

weights editor facilitates development of trade-off curves between competing objectives by allowing the user to

easily change the multiplier on an objective for all locations. Features of the software are demonstrated with a simple

hypothetical system and with real application to the Mississippi Headwaters Reservoir System is briefly described.

HEC-ResPRM is free for download on the internet.

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