Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Analysis of Time-Variant Behavior of Water Chemistry.
Author Shar, John V. A. ;
CORP Author Nevada Univ., Reno. Desert Research Inst.
Year Published 1970
Report Number Preprint-66; OWRR-A-017-NEV ;OWRR-A-024-NEV; 00629,; A-017-NEV(3)
Stock Number PB-195 305
Additional Subjects ( Water chemistry ; Time series analysis) ; ( Water quality ; Time series analysis) ; Sampling ; Statistical methods ; Stochastic processes ; Stream flow ; Seasonal variations ;
Library Call Number Additional Info Location Last
NTIS  PB-195 305 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/23/1988
Collation 11p
Time-variant behavior of water chemistry is controlled by internal factors of a hydrologic system and by external stimuli. Periodic sampling of water provides data to compute this variation. The observed time variation can be modeled as a discontinuous time series, composed of time-systematic and stochastic components. The stochastic component is a residual attributed to random fluctuations in the parent water chemistry and in sampling analysis. Nonparametric tests confirm and amplify results of serial correlation. Tests are selected for their discrimination against specific time-variant alternatives to constant behavior. Several examples demonstrate the interplay between serial correlation and nonparametric techniques and some of the interpretative difficulties met in practice. (WRSIC-abstract)