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  • 1
    Electronic Resource
    Electronic Resource
    Reservoir operation policies for optimizing energy generation at the Shiroro Dam (1988)
    Springer
    Water resources management 2 (1988), S. 209-219 
    Details
    ISSN: 1573-1650
    Keywords: Hydroelectric power ; operating policy ; optimization ; probabilistic dynamic programming ; Shiroro Dam
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: Abstract Reservoir water release policies are computed for the Shiroro Dam hydroelectric power scheme in Northern Nigeria, using a probabilistic dynamic programming model. The state variable is the reservoir storage volume, while the uncertain nature of the inflow process is accounted for in the model by considering different possible inflow volumes and their inflow probabilities. Simulation of the reservoir operations with the derived policies show that on the average the hydrosystem has acceptable reliability when two units are in use, at 45% design power plant factor. At 70% power plant factor, which is the desired optimum for the power system in Nigeria, system failures are frequent and, in most cases, severe. For normal operation of the Shiroro Dam hydroelectric power system, two or three generating units, running at 40–50% power plant factor is recommended.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00429902
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  • 2
    Electronic Resource
    Electronic Resource
    Multi-objective stochastic groundwater management of nonuniform, homogeneous aquifers (1987)
    Springer
    Water resources management 1 (1987), S. 241-254 
    Details
    ISSN: 1573-1650
    Keywords: Groundwater management ; optimization ; uncertainty analysis ; reliability ; multiple-objective analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: Abstract Like any other resources planning and management, groundwater management is performed in a stochastic environment in which the system itself involves a number of random elements. Consequences as a result of decisions made based on analyses are not certain. This paper presents a management model using the chance-constrained framework which explicitly considers the random nature of aquifer properties. The model enables the derivation of an optimal groundwater management policy that would satisfy required operation performance reliability. Furthermore, the chance-constrained model is extended to the multi-objective optimization framework in which a tradeoff between total water supply pumpage and system performance reliability is explicitly considered. The models are applied to a hypothetical example of a steady, nonuniform, homogeneous confined aquifer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00421878
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  • 3
    Electronic Resource
    Electronic Resource
    An iterative method to optimize the operation of reservoir systems (1987)
    Springer
    Water resources management 1 (1987), S. 255-266 
    Details
    ISSN: 1573-1650
    Keywords: Reservoir operation ; optimization ; dynamic programming ; water resources planning
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: Abstract Optimization of long-term operation of real-world reservoir systems by dynamic programming has been studied. Computer time requirements make it necessary to use iterative methods in the case of multi-reservoir systems. State-incremental dynamic programming provides a reasonable rate of convergence for serial systems when initial policies are suitably chosen. A new method is proposed that combines dynamic programming with successive approximations and state-incremental dynamic programming. Incremental sequential dynamic programming is especially useful for systems of complex configuration which cannot be optimized with other iterative methods due to very slow convergence. Choices of initial policy, state increment, and the number of states to be considered in each iteration are investigated in two case studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00421879
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  • 4
    Electronic Resource
    Electronic Resource
    On the parametric approach to unit hydrograph identification (1989)
    Springer
    Water resources management 3 (1989), S. 107-128 
    Details
    ISSN: 1573-1650
    Keywords: Unit hydrograph ; instantaneous unit hydrograph ; identification ; probability density function ; probability distribution function ; method of moments ; optimization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: Abstract Unit hydrograph identification by the parametric approach is based on the assumption of a proper analytical form for its shape, using a limited number of parameters. This paper presents various suitable analytical forms for the instantaneous unit hydrograph, originated from known probability density functions or transformations of them. Analytical expressions for the moments of area of these form versus their definition parameters are theoretically derived. The relation between moments and specific shape characteristics are also examined. Two different methods of parameter estimation are studied, the first being the well-known method of moments, while the second is based on the minimization of the integral error between derived and recorded flood hydrographs. The above tasks are illustrated with application examples originated from case studies of catchments in Greece.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00872467
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  • 5
    Electronic Resource
    Electronic Resource
    The connection of geodynamics with seismicity patterns (1988)
    Springer
    Natural hazards 1 (1988), S. 5-13 
    Details
    ISSN: 1573-0840
    Keywords: Geodynamics ; seismicity ; earthquake ; geomorphology ; China ; Colombia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract When a study is to be made of seismic risks, the present-day geodynamic conditions are of fundamental importance: Earthquakes do not happen by themselves, they do have a cause. The cause of earthquakes is that the tectonic stresses exceed a critical limit. The build-up of these stresses is conditioned by the geodynamic processes occurring in the region in question. A knowledge of the geodynamics characteristic of a region is therefore fundamental for seismic risk studies. The general methodology for making such a geodynamic study is based on the entire set of manifestations of the plate-tectonic conditions of that region: these include the mechanism of earthquakes, the stresses observed in mines, the orientation of surface joints and even the direction of river valleys. Examples of geodynamic studies and their bearing on seismic risks are shown from various areas of the world, notably from China, India, and Colombia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00168218
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