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Open AccessArticle

Impact of Land Use Change on Non-Point Source Pollution in a Semi-Arid Catchment under Rapid Urbanisation in Bolivia

1
Center for Aerospace Surveys and Geographic Information Systems Applications for the Sustainable Development of Natural Resources, San Simon University, P.O. Box 5294, Cochabamba, Bolivia
2
Department of Soil and Environment, Swedish University of Agricultural Sciences, P.O. Box 7014, SE-750 07 Uppsala, Sweden
3
Laboratorio de Hidráulica, San Simon University, P.O. Box 1832, Cochabamba, Bolivia
*
Author to whom correspondence should be addressed.
Academic Editor: Carla Sofia Santos Ferreira
Water 2021, 13(4), 410; https://doi.org/10.3390/w13040410
Received: 15 December 2020 / Revised: 29 January 2021 / Accepted: 1 February 2021 / Published: 4 February 2021
(This article belongs to the Special Issue Impact of Land-Use Changes on Surface Hydrology and Water Quality)
Changes in pollution pressure exerted on the Rocha River in Bolivia from diffuse sources were assessed using potential non-point pollution indexes (PNPI) for 1997 and 2017. PNPI is a simple, low-effort, time- and resource-saving method suitable for data-scarce regions, as it works at catchment level with commonly available geographical data. Land use type (obtained by Landsat imagery classification), runoff (determined by runoff coefficient characterisation) and distance to river network (calculated at perpendicular distance) were each transformed into corresponding indicators to determine their relative importance in generating pollution. Weighted sum, a multi-criteria analysis tool in the GIS environment, was used to combine indicators with weighting values. Different weighting values were assigned to each of the indicators resulting in a set of six equations. The results showed that higher PNPI values corresponded to human settlements with high population density, higher runoff values and shorter distance to river network, while lower PNPI values corresponded to semi-natural land use type, lower runoff coefficient and longer distances to river. PNPI values were positively correlated with measured nitrate and phosphate concentrations at six sub-catchment outlets. The correlation was statistical significant for phosphate in 2017. Maps were produced to identify priority source areas that are more likely to generate pollution, which is important information for future management. View Full-Text
Keywords: potential non-point pollution index; Rocha River; water quality degradation; urbanisation; land use indicator; runoff indicator; distance indicator potential non-point pollution index; Rocha River; water quality degradation; urbanisation; land use indicator; runoff indicator; distance indicator
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MDPI and ACS Style

Gossweiler, B.; Wesström, I.; Messing, I.; Villazón, M.; Joel, A. Impact of Land Use Change on Non-Point Source Pollution in a Semi-Arid Catchment under Rapid Urbanisation in Bolivia. Water 2021, 13, 410. https://doi.org/10.3390/w13040410

AMA Style

Gossweiler B, Wesström I, Messing I, Villazón M, Joel A. Impact of Land Use Change on Non-Point Source Pollution in a Semi-Arid Catchment under Rapid Urbanisation in Bolivia. Water. 2021; 13(4):410. https://doi.org/10.3390/w13040410

Chicago/Turabian Style

Gossweiler, Benjamin; Wesström, Ingrid; Messing, Ingmar; Villazón, Mauricio; Joel, Abraham. 2021. "Impact of Land Use Change on Non-Point Source Pollution in a Semi-Arid Catchment under Rapid Urbanisation in Bolivia" Water 13, no. 4: 410. https://doi.org/10.3390/w13040410

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