ID:
publications-4232
Type:
article
Year:
2008
Authors:
McKenna, Sean A. and Wilson, Mark and Wilson, M. and Wilson, M. and Klise, Katherine A.
Title:
Detecting Changes in Water Quality Data
Venue/Journal:
Journal American Water Works Association
DOI:
10.1002/j.1551-8833.2008.tb08131.x
Research type:
Water System:
Technical Focus:
Abstract:
Timely deployment of contaminant warning systems requires onβ€line sensors and advancement of data analysis and decision support systems to accurately detect water quality changes. As a demonstration of event detection in water quality data, three water quality changeβ€detection algorithms were developed and used to detect changes in water quality observed at four locations within a distribution system. Each data set was β€_x009c_spikedβ€_x009d_ with simulated anomalous water quality values of 1 h duration and 10 levels of spike strength. The receiver operating characteristic (ROC) curve is proposed as an objective means of assessing and comparing water quality changeβ€detection algorithm results that is also able to provide the tradeoff between missed detections and false alarms on a single plot. The area under the ROC curve provides a measure of the sensitivity and specificity of each algorithm for each spike strength and location. Resulting areas under the ROC curve range from 0.46 for spike strengths of 1.0 (background) to 0.98 for strengths of 3.5 standard deviations from the mean, where an ROC curve area of 1.0 indicates perfect detection.
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