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Impacts of land use change on river streamflow and water quality in a semi-arid catchment : assessment of a catchment under rapid and uncontrolled urbanisation

Gossweiler, Benjamin (2021). Impacts of land use change on river streamflow and water quality in a semi-arid catchment : assessment of a catchment under rapid and uncontrolled urbanisation. Diss. (sammanfattning/summary) Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880
ISBN 978-91-7760-805-9
eISBN 978-91-7760-806-6
[Doctoral thesis]

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Abstract

The ongoing degradation of water quality and streamflow in rivers and streams worldwide is mainly due to human action through global land use change, particularly urbanisation. Population growth and economic development are major drivers of urbanisation, which causes environmental problems such as high water demand and solid waste and wastewater generation. This thesis describes the impacts of three decades of unregulated urbanisation and land use change on water quality and streamflow in the semi-arid Rocha River catchment in Bolivia. Remote sensing and geographic information systems (GIS) based on Landsat imagery were used to detect land use change, while an index-based approach was developed to classify and compare river water quality and locate priority source areas (PSAs) of pollution. Correlation analysis was used to examine relationships between different land uses and water quality. The Soil and Water Assessment Tool (SWAT) model was employed to simulate streamflow and total nitrogen and total phosphorus transport in the catchment, based on monthly data. The results showed strong increases in the area of human settlements, forest and cropland, while semi-natural land area generally decreased. Water quality decreased over time and from catchment headwaters to outlet, and human settlements were identified as PSAs of pollution. Human settlements were also associated with decreasing water quality (p<0.01) and pollution from PSAs (p<0.05). SWAT modelling proved good (Kling-Gupta efficiency, KGE) for streamflow, satisfactory for total phosphorus, and poor for total nitrogen. Simulated mean annual streamflow (13.9-23.3 m3 s-1), total nitrogen (270.3-550.7 ton year-1) and total phosphorus (83.1-170.5 ton year-1) loads increased over time, with nutrient transport increasing overall from catchment headwaters to outlet. These deleterious impacts of urbanisation-related land use change in the Rocha River catchment demonstrate the need for effective remedial measures, including continuous monitoring, pollution mitigation and water quality restoration.

Authors/Creators:Gossweiler, Benjamin
Title:Impacts of land use change on river streamflow and water quality in a semi-arid catchment : assessment of a catchment under rapid and uncontrolled urbanisation
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2021
Number:2021:64
Number of Pages:89
Publisher:Department of Soil and Environment, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-7760-805-9
ISBN for electronic version:978-91-7760-806-6
ISSN:1652-6880
Language:English
Publication Type:Doctoral thesis
Article category:Other scientific
Version:Published version
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Geosciences, Multidisciplinary
(A) Swedish standard research categories 2011 > 2 Engineering and Technology > 201 Civil Engineering > Water Engineering
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 405 Other Agricultural Sciences > Environmental Sciences related to Agriculture and Land-use
Keywords:Landsat, maximum likelihood, long-term variations, point and non-point pollution sources, hydrological modelling, nutrient transport, Cochabamba, Bolivia
URN:NBN:urn:nbn:se:slu:epsilon-p-113353
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-113353
ID Code:25255
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Soil and Environment
(S) > Dept. of Soil and Environment
Deposited By: SLUpub Connector
Deposited On:06 Sep 2021 10:25
Metadata Last Modified:10 Sep 2021 08:43

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