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<br />ODG327 <br /> <br />The Resident Power and Reservoir System Model (PRSYM) <br /> <br />· thermal power plant support (flow, water temperature) <br />· recreation <br />· water quality <br />· water supply(including irrigation) <br /> <br />The model must be capable of expressing these multi-objectives through functions, <br />constraints, or operating rules. The handling of constraint sets and operating policy is <br />discussed in more detail in a subsequent section. <br /> <br />1 <br />,J Simulated Processes <br /> <br />" <br /> <br />!: <br /> <br />~ <br />r <br /> <br />PRSYM must be able to simulate the following physical processes: <br /> <br />, <br />J <br />.:.:~ <br />.}~ <br /> <br />Conservation of Mass <br /> <br />The model's simulation of the reservoir system must conserve mass at each time step. <br /> <br />River and Reservoir Routing <br /> <br />PRSYM must be able to operate at a variable time step including daily, weekly, and <br />monthly. To accommodate a daily time step, the simulation module must include a <br />mechanism for routing unsteady flows. The use of simplified routing methods (e.g., <br />linear reservoir routing), as well as application of the general dynamic equation for <br />gradually varied flow (i.e., full Saint-Venant equations), should be explored. <br />Although use of the full Saint- Venant equations is preferred, the most cost-effective <br />methodology which yields adequate results should be initially implemented. <br /> <br />I <br />,. <br /> <br />River/Reservoir Volume-Elevation-Area <br /> <br />d <br /> <br />. , <br /> <br />~J <br /> <br />Within the simulation module, a fundamental computation is the conversion from <br />reservoir elevation to reservoir volume (or storage), and vice versa. Evaporation <br />computations will require surface area information in addition to elevation-volume <br />conversions. Volume-elevation-surface area tables (or curves) will be used to <br />approximate the relationship between reservoir elevation and reservoir storage (or <br />surface area). For weekly or monthly time steps, it can be assu'med that reservoir <br />pools are 'flat' and that the reservoir storage/surface area is a function of headwater <br />elevation. <br /> <br />When a daily time step is employed and flow routing is required, it may become <br />necessary to define reaches within the reservoirs. The user must supply the <br />appropriate geometric information (elevation/volume/surface area/cross-sectional area) <br />to support these computations. The routing computations should provide elevations <br />and storage at selected intermediate points. <br /> <br />3-5 <br />