A Geostatistical Comparison between Routine and Event-based Water Quality Sampling

Jason Scott Lessels, Thomas Bishop

Research output: Chapter in Book/Report/Conference proceedingPublished conference contribution


Water quality sampling occurs throughout Australia to monitor the health of catchments. Due to Australia's variable climate event-based water quality sampling has become widespread. This research examines the two dominant sampling schemes used in Australia; routine (monthly) and event-based sampling. A linear model of co-regionalisation (LMCR) was used to model auto and cross-correlated discharge and total phosphorus data, from this both variables were co-simulated. From the simulations, different sampling schemes were applied. Estimations of total load were made using a linear mixed model (LMM) which models the relationship between discharge and concentration while accounting for the auto-correlation. Threshold exceedance was also used to compare the two sampling techniques. Further comparisons were made between model estimates and raw sample analysis. The results show that the event-based sampling is more accurate than routine sampling for load estimation. However both sampling schemes are limited in the accuracy of their estimates.
Original languageEnglish
Title of host publicationProceedings of the 34th World Congress of the International Association for Hydro- Environment Research and Engineering
Subtitle of host publication33rd Hydrology and Water Resources Symposium and 10th Conference on Hydraulics in Water Engineering
EditorsE M Valentine, C J Apelt, J Ball, H Chanson, R Cox, R Ettema, G Kuczera, M Lambert, B W Melville, J E Sargison
Place of PublicationAustralia
Publisher Barton, A.C.T. : Engineers
Number of pages8
ISBN (Print)9780858258686 , 0858258684
Publication statusPublished - 2011


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