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Journal Article

Investigation of scarce input data augmentation for modelling nitrogenous compounds in South African rivers

Authors

Mahlathi,  Christopher Dumisani
External Organizations;

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Wilms,  Josefine
1.2 Global Geomonitoring and Gravity Field, 1.0 Geodesy, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Brink,  Isobel
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5014423.pdf
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Citation

Mahlathi, C. D., Wilms, J., Brink, I. (2022): Investigation of scarce input data augmentation for modelling nitrogenous compounds in South African rivers. - Water Practice and Technology, 17, 12, 2499-2515.
https://doi.org/10.2166/wpt.2022.146


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5014423
Abstract
In this study, basic interpolation and machine learning data augmentation were applied to scarce data used in Water Quality Analysis Simulation Programme (WASP) and Continuous Stirred Tank Reactor (CSTR) that were applied to nitrogenous compound degradation modelling in a river reach. Model outputs were assessed for statistically significant differences. Furthermore, artificial data gaps were introduced into the input data to study the limitations of each augmentation method. The Python Data Analysis Library (Pandas) was used to perform the deterministic interpolation. In addition, the effect of missing data at local maxima was investigated. The results showed little statistical difference between deterministic interpolation methods for data augmentation but larger differences when the input data were infilled specifically at locations where extrema occurred.