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Modelling effects of spatial variability of saturated hydraulic conductivity on autocorrelated overland flow data: linear mixed model approach

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Abstract

The mixed linear model approach was introduced and applied in studying the effects of spatial variation of the saturated hydraulic conductivity (K s ) on the variation of the overland flow. Analysis was carried out with 2,000 rainfall-runoff events, all generated through transformation of real, observed rainfall events and different spatially variable K s fields in a small (12 ha) agricultural catchment. The parameters accounting for the variation in the generation method were the coefficient of variation (cv) and correlation length (L x L y ) of K s both having two levels of values obtained from field measurements of other studies. The analysis showed that the combinations with both parameters having the smaller or bigger value during flow peaks only caused different response in the overland flow. However, the parameters were statistically significant only at the 10% level. Most of the flow variation was explained by the event dynamics. The mixed models were able to model the structure of the data efficiently with less restrictive assumptions than for example the analysis of variance, hence producing more reliable results. The method was able to take into account autocorrelation of the test series, correlation between the factors and unequal variances. The usefulness of the method was supported by the fact that the conclusions drawn by it were confirmed by simple, conventional methods of a previous study, added with statistical criteria and confidence levels for each calculation moment. The findings of the study can be utilized in practise for example when designing the field sampling experiments.

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Acknowledgments

The first author gratefully acknowledges the financial support of the Centre for Water Resources Research at UCD, the EU Copernicus programme, UCD, Academy of Finland, Center for International Mobility (CIMO), Sven Hallinin tutkimussäätiö, Antti ja Jenny Wihurin rahasto, Maa- ja Vesitekniikan tuki ry., Maj ja Tor Nesslingin säätiö, Ella ja Georg Ehrnroothin säätiö, Oskar Öflunds Stiftelse, Teknillisen korkakoulun tukisäätiö and Suomalainen Tiedeakatemia (Vilho, Yrjö ja Kalle Väisälän rahasto). The authors are also thankful to Dr Seppo Rekolainen (Finnish Environment Institute) for providing the data of the Hovi catchment.

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Taskinen, A., Sirviö, H. & Bruen, M. Modelling effects of spatial variability of saturated hydraulic conductivity on autocorrelated overland flow data: linear mixed model approach. Stoch Environ Res Risk Assess 22, 67–82 (2008). https://doi.org/10.1007/s00477-006-0099-5

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