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FREQUENCY‐DURATION ANALYSIS OF DISSOLVED‐OXYGEN CONCENTRATIONS IN TWO SOUTHWESTERN WISCONSIN STREAMS 1
Author(s) -
Greb Steven R.,
Graczyk David J.
Publication year - 1995
Publication title -
jawra journal of the american water resources association
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.957
H-Index - 105
eISSN - 1752-1688
pISSN - 1093-474X
DOI - 10.1111/j.1752-1688.1995.tb04031.x
Subject(s) - streams , duration (music) , water quality , environmental science , hydrology (agriculture) , continuous monitoring , statistical analysis , ecology , statistics , geology , mathematics , computer science , biology , engineering , operations management , art , computer network , literature , geotechnical engineering
Historically, dissolved‐oxygen (DO) data have been collected in the same manner as other water‐quality constituents, typically at infrequent intervals as a grab sample or an instantaneous meter reading. Recent years have seen an increase in continuous water‐quality monitoring with electronic dataloggers. This new technique requires new approaches in the statistical analysis of the continuous record. This paper presents an application of frequency‐duration analysis to the continuous DO records of a cold and a warm water stream in rural southwestern Wisconsin. This method offers a quick, concise way to summarize large time‐series data bases in an easily interpretable manner. Even though the two streams had similar mean DO concentrations, frequency‐duration analyses showed distinct differences in their DO‐concentration regime. This type of analysis also may be useful in relating DO concentrations to biological effects and in predicting low DO occurrences.