Seasonal variations of the distribution of river water quality

摘要: The probability distributions of different values water quality indices have been shown theoretically to follow a two-parameter lognormal law with season-dependent parameters. obtained distribution was checked against data many-year monitoring in the Moskva R. (at Rublevo Settl.). several hydrochemical and microbiological studied. seasonal dependence parameters cause splitting index predominantly into two branches, one corresponding low-water seasons other floods. Exceptions are turbidity color index: former splits three branches (corresponding periods winter period, summer period moderate rains, floods, high rain floods), while has only branch, embracing all seasons.