ABSTRACT

Krasovskaïa and Gottschalk (1996) took a different approach, proposing an analytical determination of the hydrological regime by calculating a stability index of occurrence of low and high flow periods. This index is based on the concept of data content and entropy and is calculated as follows:

(10.4)

where H is the entropy of the system and pi is the probability of occurrence of the state i of the system which includes a maximum of n states. From this definition, the authors propose a classification based on an iterative procedure that makes it possible to assign a series of observations from a particular measurement station to a particular regime.