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Georgakakos, Aristidis P.

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Author: Georgakakos, Aristidis P. × End date: 1999 × Start date: 1995 × Type: Text × search.filters.applied.f.resourcesubtype: Proceedings ×

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A Review of Fish Ecology Models and an Approach for Integrated Reservoir and Ecological Management

1997-03 , Brumbelow, Kelly , Georgakakos, Aristidis P.

Many species of fish have suffered detrimental impacts due to the construction and operation of reservoirs. Life-scientists have utilized three basic methods to attempt to include the needs of riverine ecology in the formulation of reservoir operation policies. (1) Beginning in the 1970's, discharge-based methods used heuristics to determine minimum allowable streamfiows to protect riverine life. (2) Habitat-based models were developed after the shortcomings of minimum allowable streamflow recommendations were realized and as greater knowledge of fish biology and ecology was gained. These models used hydraulic modeling and species- and lifestage-specific habitat preferences to determine quantity and quality of habitat as a function of streamflow. (3) Individual-based models have emerged in the 1990's as further understanding of fish life-processes has accumulated these models track the daily actions and movements of individual organisms. The State of Georgia currently uses a variety of discharge-based methods to determine minimum allowable strearnflows. The opportunity now exists to utilize many new technologies to integrate ecological and other "traditional" objectives in a real-time, operational decision support system. The principal technologies to be exploited include the ELQG algorithm individual-based models, computational fluid dynamics, and geographic information systems.

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Water Resources Management: Challenges and Opportunities

1997-03 , Georgakakos, Aristidis P.

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A Control Model for Hydropower Systems Analysis and Operation

1995-04 , Georgakakos, Aristidis P. , Yao, Huaming , Yu, Yongqing

In North America, hydropower provides a significant portion of the electrical capacity, ranging from about 60 percent in Canada, to more than 30 percent in Mexico, to about 13 percent in the U.S. (North America Hydroelectric Research and Development Forum, 1992). Among the attractive features of hydropower is that it is renewable, clean, efficient, economical., and domestically produced. In the U.S., the amount of hydroelectric production is equivalent to nearly 500 million barrels of oil annually, which, at today's oil prices, have a value of $9 billion. In addition to meeting electricity demands, hydropower facilities play a critical role in water management, helping to provide flood control and water for irrigation, municipal and industrial uses, navigation, recreation, and fish and wildlife preservation. Improving the way projects are operated is a top research need. It is worth noting that a 1 percent increase in the efficiency of existing hydro plants in the U.S. would provide an additional 3 billion kilowatt-hours of electricity annually, saving the equivalent of 1.4 million tons of coal or 4.9 million barrels of oil (North American Hydroelectric Research and Development Forum, 1992). The primary motivations for this research work are (1) to demonstrate that modem optimization methods can effectively optimize the utilization of hydropower facilities and (2) compare the relative performance of optimization and the more traditional simulation models. In this article, we take up the first task and describe the problems addressed, the models developed, and the results obtained. The second task will be the subject of a panel discussion.

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