|Models to minimize monitoring|
Radford, P.J.; West, J. (1986). Models to minimize monitoring. Wat. Res. 20(8): 1059-1066
In: Water Research. Elsevier: Oxford; New York. ISSN 0043-1354, more
Cadmium; Control charts; Cumulative sum charts; Models; Monitoring; Pollution; Salinity; Simulation; Marine; Brackish water
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Attempts to monitor changes in the mean concentration of pollutants in estuaries are hampered by the inherent and large seasonal variance induced by the annual pattern of river run-off. Simple models can predict this dilution effect leaving a much smaller variance against which to test for pollution events or gradual changes. An efficient method based on control charts may then be used to test for significant departures from historical performances so enabling a relatively rapid response to be made to undesirable changes. Cumulative sum techniques may also be used to test for inconsistencies between model and calibration data leading to better prediction and therefore more sensitive control of estuarine pollution. These techniques are illustrated using salinity and dissolved cadmium data for the Severn Estuary.