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A new trend function-based regression kriging for spatial modeling of groundwater hydraulic heads under the sparse distribution of measurement sites

  • Research Article - Hydrology
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Abstract

Discrete groundwater level datasets are interpolated often using kriging group of models to produce a spatially continuous groundwater level map. There is always some level of uncertainty associated with different interpolation methods. Therefore, we developed a new trend function with the mean groundwater level as a drift variable in the regression kriging approach to predict the groundwater levels at the unvisited locations. Groundwater level data for 29 observation wells in Adyar River Basin were used to assess the performance of the developed regression kriging models. The cross-validation results shows that the proposed regression kriging method in the spatial domain outperforms other physical and kriging-based methods with R2 values of 0.96 and 0.98 during pre-monsoon and post-monsoon seasons, respectively.

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Data availability statement

MATLAB scripts used for kriging and IDW models are available in the following GitHub repository: https://github.com/mohanasundaram1986/kriging

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Acknowledgement

We would like to acknowledge the State Ground and Surface Water Resources Data Centre (SGSWRDC), Institute of Water Studies (IWS), Taramani, for sharing the groundwater hydraulic head datasets for this research. We would also like to acknowledge and thank the departmental computer facility, department of civil engineering, IIT Madras, India, and Water Engineering and Management, Asian Institute of Technology, Pathum Thani, Thailand, for providing the high-end computer facility to carry out this research. We also would like to acknowledge the authors of this manuscript for technical suggestions and grammatical editing contributions.

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Correspondence to S. Mohanasundaram.

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Mohanasundaram, S., Udmale, P., Shrestha, S. et al. A new trend function-based regression kriging for spatial modeling of groundwater hydraulic heads under the sparse distribution of measurement sites. Acta Geophys. 68, 751–772 (2020). https://doi.org/10.1007/s11600-020-00427-y

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  • DOI: https://doi.org/10.1007/s11600-020-00427-y

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