Assessment of chemical water types and their spatial variation using multi-stage cluster analysis, Queensland, Australia

McNeil, Vivienne H.; Cox, Malcolm; Preda, Micaela

doi:10.1016/j.jhydrol.2004.12.014

Cited by 91 publications

(74 citation statements)

References 38 publications

(43 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Climate effects on stream EC are complex because they involve rainfall and temperature patterns, and the dynamic interactions between ground and surface water (McNeil et al, 2005). Intense or prolonged wet conditions would flush accumulated salts from the surface and from upper soil horizons, resulting initially in large flows of dilute surface water.…”

Section: Recognition Of Broadscale Decadal Patterns In Stream Salinitmentioning

confidence: 99%

Defining the climatic signal in stream salinity trends using the Interdecadal Pacific Oscillation and its rate of change

McNeil¹,

Cox

2007

Hydrol. Earth Syst. Sci.

View full text Add to dashboard Cite

Abstract. The impact of landuse on stream salinity is currently difficult to separate from the effect of climate, as the decadal scale climatic cycles in groundwater and stream hydrology have similar wavelengths to the landuse pattern. These hydrological cycles determine the stream salinity through accumulation or release of salt in the landscape. Widespread patterns apparent in stream salinity are discussed, and a link is demonstrated between stream salinity, groundwater levels and global climatic indicators. The Interdecadal Pacific Oscillation (IPO) has previously been investigated as a contributory climatic indicator for hydrological and related time series in the Southern Hemisphere. This study presents an approach which explores the rate of change in the IPO, in addition to its value, to define an indicator for the climate component of ambient shallow groundwater levels and corresponding stream salinity. Composite time series of groundwater level and stream salinity are compiled using an extensive but irregular database covering a wide geographical area. These are modelled with respect to the IPO and its rate of change to derive control time series. A example is given of how a stream salinity trend changes when the decadal climatic influence is removed.

show abstract

Section: Recognition Of Broadscale Decadal Patterns In Stream Salinitmentioning

confidence: 99%

Defining the climatic signal in stream salinity trends using the Interdecadal Pacific Oscillation and its rate of change

McNeil¹,

Cox

2007

Hydrol. Earth Syst. Sci.

View full text Add to dashboard Cite

show abstract

“…Assessments of hydrochemical processes in groundwater systems are typically aided by conventional geochemical displays (e.g. histograms, Piper plots) and multivariate statistical methods (Guler et al 2002;Hussein 2004;McNeil et al 2005;Singh et al 2004). While graphical techniques provide valuable and rapidly accessible information, they visualize only a limited number of variables and are not particularly useful to produce distinct groups of samples discriminated by objective means (Guler et al 2002).…”

Section: Introductionmentioning

confidence: 99%

Geochemical characterization of karst groundwater in the cradle of humankind world heritage site, South Africa

Holland

Witthüser

2008

Environ Geol

View full text Add to dashboard Cite

The karst of the Cradle of Humankind World Heritage Site plays a major role in the assimilation or carrying of acid mine drainage, sewage effluent return flow and agricultural run-off. Infiltration of contaminated water has altered the chemical composition of the natural waters of the karst system. A multivariate statistical method in combination with conventional geochemical and spatial analysis was applied on groundwater and surface water quality samples to determine the spatial extent of hydrochemical impacts from different anthropogenic sources. The application of hierarchical cluster analysis of the major ions (148 samples) recognised three distinct hydrochemical regimes. Cluster 1 is moderately mineralized, especially with regard to chloride, nitrate and sulphate, cluster 2 has a low mineralization with all elements well within the recommended drinking water limits of South Africa and cluster 3 represents highly mineralized samples taken in the vicinity of decanting mineshafts. The cluster solution is confirmed by a simple mixing model, indicating varying contributions of three identified end members (acid mine drainage, treated sewage effluents and pristine dolomitic groundwater) to the groundwater quality in the catchment. The combination of statistical, geochemical and spatial methods in conjunction with end-member mixing analysis provides a reliable method to understand the processes responsible for the groundwater quality variations and to assist in the identification of anthropogenic impacts.

show abstract

“…Una valoración multivariante fue adaptada por McNeil et al (2005) para la clasificación de un conjunto de datos grande e irregular, de aproximadamente 34.000 muestras de agua superficial acumuladas por más de 30 años. Un método cluster de K-medias en dos etapas fue diseñado para analizar datos químicos en forma de porcentajes de iones principales; la primera etapa de agrupamiento produjo 347 grupos los cuales fueron entonces reagrupados para generar al final nueve clasificaciones de tipos de agua.…”

Section: Petersen Et Al (2001) Aplicaron La Técnica De Análisis De Cunclassified

“…Los métodos no jerárquicos (o partitivos) se aplican principalmente a grandes conjuntos de datos (McNeil et al, 2005).…”

Section: Análisis Cluster (Ca)unclassified

Modelación unidimensional de la calidad del agua en embalses. Análisis comparativo de modelos y multivariantes.

Gutiérrez¹

View full text Add to dashboard Cite

Assessment of chemical water types and their spatial variation using multi-stage cluster analysis, Queensland, Australia

Cited by 91 publications

References 38 publications

Defining the climatic signal in stream salinity trends using the Interdecadal Pacific Oscillation and its rate of change

Defining the climatic signal in stream salinity trends using the Interdecadal Pacific Oscillation and its rate of change

Geochemical characterization of karst groundwater in the cradle of humankind world heritage site, South Africa

Modelación unidimensional de la calidad del agua en embalses. Análisis comparativo de modelos y multivariantes.

Contact Info

Product

Resources

About