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Multi-Dimensional SurfaceWater Quality Analyses in the Manawatu River Catchment, New Zealand

Tenebe, I.T. and Julian, Jason P. and Emenike, PraiseGod C and Dede-Bamfo, Nathaniel and Omeje, Maxwell and Sanni, Samuel Eshorame and Babatunde, Eunice and Alves, Darlan D. (2023) Multi-Dimensional SurfaceWater Quality Analyses in the Manawatu River Catchment, New Zealand. Water, 15. pp. 1-24.

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Land Use and Land Cover (LULC) properties give vital information about pollution signatures in rivers, and they help develop best management practices (BMPs) for effective water resource management. This work employs multivariate statistical methods, receptor modeling, connectivity analysis, and univariate trend analysis to investigate pollution sources across spatiotemporal scales in the Manawatu River, New Zealand. A positive matrix factorization (PMF) method was applied to interpret possible contamination sources. A 25-year dataset (1989–2014) comprising 12 water quality variables from three sites was used. Runoff connectivity analyses identified high-producing grassland (HG) as the most dominant pollution class in all sub-catchments. Univariate analyses revealed that nutrients and sediments were higher than in the initial monitoring years. The PMF analysis found possible pollutants causing impairment, which required attention from waste managers. PMF also showed that point, natural, and agricultural sources significantly contributed to pollution downstream of the river. In the midstream, the erosion, point, and agricultural sources were significant contributing factors. Agricultural pollution and soil erosion were the main contributors to the upstream sub-catchment area. This study suggests that BMPs with a high retention capacity are needed in specific locations in the catchment area to filter high concentrations of pollutants generated.

Item Type: Article
Uncontrolled Keywords: pollution status; river water quality; source apportionment; agricultural pollution; LULC
Subjects: Q Science > QC Physics
T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TP Chemical technology
Divisions: Faculty of Engineering, Science and Mathematics > School of Physics
Depositing User: nwokealisi
Date Deposited: 21 May 2024 15:25
Last Modified: 21 May 2024 15:25

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