American Society of Civil Engineers

Large River Diversion Optimization Considering the Uncertainties Involved

by M. H. Afshar, A. Afshar, and H. Parvazian

pp. 4347-4352

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Document type: Conference Proceeding Paper
Part of: North American Water and Environment Congress & Destructive Water
Abstract: Temporary river diversion during major construction (i.e., large dams) is a challenging job. Selection of diversion system capacity and the dimension of the system components are subject to socio-economic and technical consideration. In the small reservoirs created by the upstream cofferdam the effect of flood routing is insignificant and need not be considered. Whereas in large reservoirs, it should not be disregarded. Therefore, the flood routing process along with quantification of hydraulic and hydrologic uncertainties must be included in an optimal design procedure. This paper must be included in an optimal design procedure. This paper attempts to integrate the uncertainties in flood magnitude estimator, hydraulic uncertainties, and flood routing process in a river diversion optimization model. Statistical parameters of routed flood through the reservoir were estimated for a wide range of possible design parameters and used as input to the risk.based optimum design model. For hydraulic uncertainties a first “order second” moment analysis was carried out. To examine its application data from Karkheh dam in Iran was employed. Results show considerable improvement and time saving in diversion system design.

ASCE Subject Headings:
Diversion structures
Flood routing
Hydraulic properties
Hydrologic aspects
Rivers and streams
Uncertainty principles