Modelling groundwater arsenic contamination in China with the Groundwater Assessment Platform (GAP)

Ruth, Arnheiter

doi:10.21256/zhaw-2150

Please use this identifier to cite or link to this item: https://doi.org/10.21256/zhaw-2150

Publication type:	Bachelor thesis
Title:	Modelling groundwater arsenic contamination in China with the Groundwater Assessment Platform (GAP)
Authors:	Ruth, Arnheiter
Advisors / Reviewers:	Podgorski, Joel Baier, Urs
DOI:	10.21256/zhaw-2150
Extent:	41
Issue Date:	2017
Publisher / Ed. Institution:	ZHAW Zürcher Hochschule für Angewandte Wissenschaften
Publisher / Ed. Institution:	Winterthur
Language:	English
Subject (DDC):	363: Environmental and security problems
Abstract:	Natural arsenic contamination in groundwater threatens the health of millions of people worldwide. Arsenic prediction models can help policy makers better identify areas of risk. In this study, the GIS-based Groundwater Assessment Platform (GAP, gapmaps.org) was used to produce a prediction model of China, which was compared to the hazard map of Lado et al. published in 2013. Both studies are based on logistic regression using the WHO guideline for arsenic in drinking water of 10 μg L-1, and the same 2668 arsenic measurement data and environmental variables. Lado et al. used eight environmental variables in 100 stepwise logistic regressions that were then aggregated to produce a prediction model. Using a subsample of four of Lado et al.’s variables GAP was used to produce one logistic regression for creating a map of high risk areas. Comparison of the results showed that GAP can produce results as accurate as those of Lado et al. The two maps are highly correlated and show only minor differences when binary coded. A sensitivity analysis showed that the measurement data could be reduced to less than 40% of the initial measurement data and still produces reasonably accurate results, given sufficient variability in the prediction variables used. Some technical limitations and missing information in GAP, such as the number of allowed prediction variables and what criterion is evaluated in the stepwise logistic regression, should be improved to help policymakers better assess the risk of arsenic pollution in groundwater with GAP.
URI:	https://digitalcollection.zhaw.ch/handle/11475/10893
License (according to publishing contract):	Licence according to publishing contract
Departement:	Life Sciences and Facility Management
Appears in collections:	Bachelorarbeiten Umweltingenieurwesen

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Ruth, A. (2017). Modelling groundwater arsenic contamination in China with the Groundwater Assessment Platform (GAP) [Bachelor’s thesis, ZHAW Zürcher Hochschule für Angewandte Wissenschaften]. https://doi.org/10.21256/zhaw-2150

Ruth, A. (2017) Modelling groundwater arsenic contamination in China with the Groundwater Assessment Platform (GAP). Bachelor’s thesis. ZHAW Zürcher Hochschule für Angewandte Wissenschaften. Available at: https://doi.org/10.21256/zhaw-2150.

A. Ruth, “Modelling groundwater arsenic contamination in China with the Groundwater Assessment Platform (GAP),” Bachelor’s thesis, ZHAW Zürcher Hochschule für Angewandte Wissenschaften, Winterthur, 2017. doi: 10.21256/zhaw-2150.

RUTH, Arnheiter, 2017. Modelling groundwater arsenic contamination in China with the Groundwater Assessment Platform (GAP). Bachelor’s thesis. Winterthur: ZHAW Zürcher Hochschule für Angewandte Wissenschaften

Ruth, Arnheiter. 2017. “Modelling Groundwater Arsenic Contamination in China with the Groundwater Assessment Platform (GAP).” Bachelor’s thesis, Winterthur: ZHAW Zürcher Hochschule für Angewandte Wissenschaften. https://doi.org/10.21256/zhaw-2150.

Ruth, Arnheiter. Modelling Groundwater Arsenic Contamination in China with the Groundwater Assessment Platform (GAP). ZHAW Zürcher Hochschule für Angewandte Wissenschaften, 2017, https://doi.org/10.21256/zhaw-2150.