Trends in concentrations of solutes in an upland catchment in Scotland

Miller, J. David; Hirst, D.

doi:10.1016/s0048-9697(98)00139-9

Cited by 27 publications

(19 citation statements)

References 16 publications

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“…Using additive models it is possible to examine the variation in water quality due to changes in flow, seasonality and long term trends. Similar approaches have been described elsewhere (Robson and Neal, 1996;Hirst, 1998;Miller and Hirst, 1998). The model used here is a time series model with three components; trend, variable amplitude seasonality and variable slope flow.…”

Section: Trend Analysis Of Water Quality Datamentioning

confidence: 99%

An analysis of the long-term variation in stream water quality for three upland catchments at Loch Dee (Galloway, S.W. Scotland) under contrasting land management

Langan¹,

Hirst

2004

Hydrol. Earth Syst. Sci.

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A long term record of water chemistry, consisting of twenty years of weekly spot samples, from three sub-catchments draining into a loch and the loch outflow in Galloway, S.W. Scotland have been analysed. The analysis undertaken consisted of a three component statistical trend model. The technique allows the identification of long-term, seasonal and short-term trends, as well as differentiation between base flow and high flow responses. The land usage in the three sub-catchments is moorland, forest and forest plus lime. The results show that, since the mid1980s, there has been a gradual decline in stream-water sulphate of the same order as reductions in the deposition of non-marine sulphate. Superimposed on this trend are somewhat random but considerable perturbations to this decline, caused by sea-salt deposition. There is no evidence of changes in surface water nitrate concentrations. The influence of different land management is evident in the sulphate, nitrate and pH data, whilst variations in calcium concentrations are also a product of differences in hydrological routing and the impact of sea-salt episodes.

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Section: Trend Analysis Of Water Quality Datamentioning

confidence: 99%

An analysis of the long-term variation in stream water quality for three upland catchments at Loch Dee (Galloway, S.W. Scotland) under contrasting land management

Langan¹,

Hirst

2004

Hydrol. Earth Syst. Sci.

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“…Littlewood et al (1998) have used such databases for the estimation of UK river mass loads of pollutants. Miller and Hirst (1998) used the hydrochemical databases from an upland catchment in Scotland for a period of five years to assess the annual variation in amounts and concentration of solutes and to examine the variation in stream water quality due to changes in flow, season and long time trend. Ferrier et al (2001) analyzed in detail databases for Scotland and identified temporal changes in water quality over the last 20 years.…”

Section: Introductionmentioning

confidence: 99%

Water quality trend analysis for the Karoon River in Iran

Naddafi

Hamed

Ahmadi

2007

Environ Monit Assess

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The Karoon River basin, with a basin area of 67,000 km(2), is located in the southern part of Iran. Monthly measurements of the discharge and the water quality variables have been monitored at the Gatvand and Khorramshahr stations of the Karoon River on a monthly basis for the period 1967-2005 and 1969-2005 for Gatvand and Khorramshahr stations, respectively. In this paper the time series of monthly values of water quality parameters and the discharge were analyzed using statistical methods and the existence of trends and the evaluation of the best fitted models were performed. The Kolmogorov-Smirnov test was used to select the theoretical distribution which best fitted the data. Simple regression was used to examine the concentration-time relationships. The concentration-time relationships showed better correlation in Khorramshahr station than that of Gatvand station. The exponential model expresses better concentration - time relationships in Khorramshahr station, but in Gatvand station the logarithmic model is more fitted. The correlation coefficients are positive for all of the variables in Khorramshahr station also in Gatvand station all of the variables are positive except magnesium (Mg2+), bicarbonates (HCO3-) and temporary hardness which shows a decreasing relationship. The logarithmic and the exponential models describe better the concentration-time relationships for two stations.

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“…Littlewood et al (1998) have used such databases for estimation of UK river mass loads of pollutants. Miller and Hirst (1998) used the hydrochemical databases from an upland catchment in Scotland for a period of five years to assess the annual variation in amounts and concentration of solutes and to examine the variation in streamwater quality due to changes in flow, season and long time trend. Ferrier et al (2001) analysed in detail databases for Scotland and identified temporal changes in water quality over the last 20 years.…”

Section: Introductionmentioning

confidence: 99%

Statistical and trend analysis of water quality and quantity data for the Strymon River in Greece

Antonopoulos

Papamichail

Mitsiou

2001

Hydrol. Earth Syst. Sci.

117

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Strymon is a transboundary river of Greece, Bulgaria and Former Yugoslav Republic of Macedonia (FYROM) in southeastern Europe. Water quality parameters and the discharge have been monitored each month just 10 km downstream of the river's entry into Greece. The data of nine water quality variables (T, ECw, DO, SO 4 2-, Na + +K + , Mg 2+ , Ca 2+ , NO 3 -, TP) and the discharge for the period 1980-1997 were selected for this analysis. In this paper a) the time series of monthly values of water quality parameters and the discharge were analysed using statistical methods, b) the existence of trends and the evaluation of the best fitted models were performed and c) the relationships between concentration and loads of constituents both with the discharge were also examined. Boxplots for summarising the distribution of a data set were used. The χ 2 -test and the Kolmogorov-Smirnov test were used to select the theoretical distribution which best fitted the data. Simple regression was used to examine the concentration-discharge and the load-discharge relationships. According to the correlation coefficient (r) values the relation between concentrations and discharge is weak (r< 0.592) while the relation between loads and discharge is very strong (r>0.902). Trends were detected using the nonparametric Spearman's criterion upon the data for the variables: Q, ECw, DO, SO 4 2-, Na + +K + and NO 3 -on which temporal trend analysis was performed.

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Trends in concentrations of solutes in an upland catchment in Scotland

Cited by 27 publications

References 16 publications

An analysis of the long-term variation in stream water quality for three upland catchments at Loch Dee (Galloway, S.W. Scotland) under contrasting land management

An analysis of the long-term variation in stream water quality for three upland catchments at Loch Dee (Galloway, S.W. Scotland) under contrasting land management

Water quality trend analysis for the Karoon River in Iran

Statistical and trend analysis of water quality and quantity data for the Strymon River in Greece

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