Understanding processes governing water quality in catchments using principal component scores

Selle, Benny; Schwientek, Marc; Lischeid, Gunnar

doi:10.1016/j.jhydrol.2013.01.030

Cited by 61 publications

(29 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These indicators commonly identify processes related to human disturbances such as farming, erosion, and movement of suspended materials and contaminants into rivers [46]. In our analysis, the changes in EC, TDS, and salinity ( Figure 2) to high spikes at sites 13,14,15,29,36 correspond to zones of increased pollutant discharge into river system from adjoining land activities. At sites 13 and 14, snowpea farming by SSHORT intensive farmers was observed, often occurring on stream edges.…”

Section: Electrical Conductivity (Ec) Total Dissolved Solids (Tds) mentioning

confidence: 87%

See 1 more Smart Citation

Understanding the Impact of Intensive Horticulture Land-Use Practices on Surface Water Quality in Central Kenya

Muriithi

2015

Environments

View full text Add to dashboard Cite

Rapid expansion of commercial horticulture production and related activities contribute to declining surface water quality. The study sought to understand the impacts on select rivers in Laikipia and Meru, production hotspots. The specific aims were (1) to identify prevailing surface water quality by examining variations of 14 physico-chemical parameters, and (2) to categorize measured surface water quality parameters into land use types highlighting potential pollutant source processes. Water samples were collected in July and August 2013 along 14 rivers in the study area. The data were analyzed using principal component analysis (PCA) and discriminant analysis (DA). Principal components (PCs) explained 70% of the observed total variability of water quality, indicating a prevalence of heavy metal traces (cadmium, phosphate, and zinc). These were linked to the rigorous use of phosphate fertilizers and copper-based agrochemicals in intensive farming. DA provided four significant (p < 0.05) discriminant functions, with 89.5% correct assignment enabling the association of land use with observed water quality. Concentrations of dissolved solids, electro-conductivity, and salinity spiked at locations with intensive small-scale and large-scale horticulture. Understanding the impacts of intensive commercial horticulture and land use practices on water quality is critical to formulating ecologically sound watershed management and pollution abatement plans.

show abstract

Section: Electrical Conductivity (Ec) Total Dissolved Solids (Tds) mentioning

confidence: 87%

“…These techniques not only facilitate the analysis and interpretation of intricate water quality data [25,28,29], but also allow for an in-depth understanding of the prevailing surface water quality and the detection of source processes influencing water systems.…”

Section: Introductionmentioning

confidence: 99%

Understanding the Impact of Intensive Horticulture Land-Use Practices on Surface Water Quality in Central Kenya

Muriithi

2015

Environments

View full text Add to dashboard Cite

show abstract

“…The two analytical data sets of both kettle holes were merged by averaging the μXRF data (RG 1 , KR 1 ) within the respective 1-cm layers. Merging data from different sites is quite common in hydrology and geochemistry (Selle et al 2013) and results in adding information compared to performing a separate analysis for each data set, thus better disentangling the site-specific peculiarities. To achieve equal weighting of the different variables irrespective of the different ranges and variances of values, the data were normalized to zero mean and unit variance for each variable.…”

Section: Principal Component Analysismentioning

confidence: 99%

Sediment cores from kettle holes in NE Germany reveal recent impacts of agriculture

Kleeberg

Neyen

Schkade

et al. 2015

Environ Sci Pollut Res

Self Cite

View full text Add to dashboard Cite

Glacial kettle holes in young moraine regions receive abundant terrigenous material from their closed catchments. Core chronology and sediment accumulation were determined for two semi-permanent kettle holes, designated RG and KR, on arable land close to the villages of Rittgarten and Kraatz, respectively, in Uckermark, NE Germany. Core dating ((210)Pb, (137)Cs) revealed variable sediment accretion rates through time (RG 0.4-23.1 mm a(-1); KR 0.2-35.5 mm a(-1)), with periods of high accumulation corresponding to periods of intensive agricultural activity and consequent erosional inputs from catchments. Sediment composition (C, N, P, S, K, Ca, Fe, Mn, Zn, Cu, Mo, Pb, Cd, Zr) was used to determine sediment source and input processes. At RG, annual P input increased from 0.65 kg ha(-1) in the early nineteenth century to 1.67 kg ha(-1) by 2013. At KR, P input increased from 0.6 to 4.1 kg ha(-1) over the last century. There was a concurrent increase in Fe input in both water bodies. Thus, Fe/P ratios showed no temporal trend and did not differ between RG (18.5) and KR (18.4), indicating similar P mobility. At RG, the S/Fe ratio increased from 0.4 to 2.3, indicating more iron sulphides and thus higher P availability, coinciding with high coverage of duckweed (Spirodela polyrhiza (L.)) and soft hornwort (Ceratophyllum submersum L.). At KR, however, this ratio remained low and relatively unchanged (0.3 ± 0.4), indicating more efficient Fe-P binding and lower hydrophyte productivity. Trends in sediment composition indicate a shift towards eutrophication in both kettle holes, but with differences in timing and magnitude. Other morphologically similar kettle holes in NE Germany that are prone to erosion could have been similarly impacted but may differ in the extent of sediment infilling and degradation of their ecological functions.

show abstract

“…Muschelkalk limestone formation which forms the main karstified aquifer (Selle et al, 2013). In this catchment, annual precipitation is 700-800 mm.…”

Section: Study Areamentioning

confidence: 98%

Contributions of Catchment and In-Stream Processes to Suspended Sediment Transport in a Dominantly Groundwater-Fed Catchment

Liu¹,

Zarfl²,

Basu³

et al. 2018

Preprint

Self Cite

View full text Add to dashboard Cite

Abstract. Suspended sediments impact stream water quality by increasing the turbidity and acting as a vector for strongly sorbing pollutants. Understanding their sources is of great importance to develop appropriate river management strategies. In this study, we present an integrated sediment transport model composed of a catchment-scale hydrological model to predict river discharge, a river-hydraulics model to obtain shear stresses in the channel, a sediment-generating model, and a river 10 sediment-transport model. We use this framework to investigate the sediment contributions from catchment and in-stream hotspots and hot moments of bed erosion for the main stem of the Ammer River. The results suggest that the contributions of suspended-sediment loads from urban areas and in-stream processes are higher in the summer months, while deposition has small variations with a slight increase in summer months. The catchment input, bed erosion, and bank erosion increase with an increase in flow rates. Bed erosion and bank erosion are negligible when flow is smaller than the corresponding thresholds of 1.5 m 3 s -1 and 2.5 m 3 s -1 , respectively. The bed-erosion rate is higher during the summer months and varies 20 along the main stem. Over the simulated time period, net sediment trapping is observed in the Ammer River. The present work is the basis to study particle-facilitated transport of pollutants in the system, helping to understand fate and transport of sediments and sediment-bound pollutants.

show abstract

Understanding processes governing water quality in catchments using principal component scores

Cited by 61 publications

References 12 publications

Understanding the Impact of Intensive Horticulture Land-Use Practices on Surface Water Quality in Central Kenya

Understanding the Impact of Intensive Horticulture Land-Use Practices on Surface Water Quality in Central Kenya

Sediment cores from kettle holes in NE Germany reveal recent impacts of agriculture

Contributions of Catchment and In-Stream Processes to Suspended Sediment Transport in a Dominantly Groundwater-Fed Catchment

Contact Info

Product

Resources

About