On the extreme streamflow drought analysis
2002
Zelenhasic, E.
A procedure, based on the distribution of the largest streamflow drought deficit and on the composite hydrograph recession curve, is proposed for the derivation of the n-year streamflow drought, for the cases for which the assumption of identical deficit and duration frequencies is not valid, for a given river at a given location. The present article is a continuation of the previous work of Zelenhasic on the extremes of low flows. The previous streamflow drought stochastic model dealt with the situation where their exists the equality of probability of occurrence of extreme drought deficit and extreme drought duration, i.e. the assumption of identical deficit and duration frequencies. In practice, the condition of identical frequencies is often mitigated by the less stringent condition of approximate frequencies. The present article analyzes the situation in which there is no equality of probability of occurrence of extreme drought deficit and extreme drought duration. Or, to be more specific, this method has no constraints such as the assumption of identical deficit and duration frequencies. The earlier theoretical explanations of the individual streamflow drought components of the method of streamflow drought stochastic process are completely valid in this paper, as well. The method has been applied in this paper to data from gaging stations on the Sava River at Srem. Mitrovica, the Drava River at D. Miholjac and the Danube River at Bezdan. The application of the procedure has shown that the method is simple, reliable and efficient.
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