title: Hasse diagram technique as a tool for water quality assessment.
abstract: The management of the quality large water catchments is a complex problem which requires intelligent data analysis on various levels - analytical, spatial, and temporal. Recently, a successful approach is developed combining advanced multivariate data treatment approaches like self-organizing maps of Kohonen (SOM) and Hasse diagram technique (HDT). In the first step of the environmetric analysis the monitoring data were subject to pre-processing using SOMs to reduce the number of objects and/or water quality parameters. In the next step HDT for partial ranking (both in spatial and temporal aspect) was applied according to the pre-selected set of the water quality parameters. The use of the water quality norms issued by the Bulgarian environmental authorities revealed important details in assessing the Maritsa River water quality. Thus, the relations between different water quality patterns and sampling stations could be used by water management authorities during the period of observation.
authors.affiliation: Group of Chemometrics and Environmetrics, Chair of Analytical Chemistry, Faculty of Chemistry and Pharmacy, University of Sofia St. Kl. Okhridski, Sofia, Bulgaria. voyslavov@abv.bg
authors.forename: Tsvetomil
authors.initials: T
authors.lastname: Voyslavov
authors.forename: Stefan
authors.initials: S
authors.lastname: Tsakovski
authors.forename: Vasil
authors.initials: V
authors.lastname: Simeonov
mesh_terms: D004784:Environmental Monitoring / Q000379:methods*; D015999:Multivariate Analysis; D012680:Sensitivity and Specificity; D014867:Water / Q000737:chemistry*; D060753:Water Quality / Q000592:standards*
chemical_list: D014867:Water