Sensitivity analysis and field testing of the RISK-N model in the Central Valley of Chile

Oyarzún, L Ricardo; Arumí, José Luis; Salgado, Luis; Mariňo, Miguel A.

doi:10.1016/j.agwat.2006.07.008

Cited by 31 publications

(21 citation statements)

References 27 publications

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“…validated using monitoring water data can properly describe the characteristics of water quantity and quality processes in this area. Sensitivity analysis can test the overall responsiveness of the model to change of certain input parameters (Oyarzun et al, 2007), thus pointing out the critical parameters that need to be carefully investigated through data gathering and field studies for reliable modelling outputs. Additionally, sensitivity analysis can be used as a way of understanding the general behaviour of a model in evaluating its confidence and in interpreting results during the calibration phase (Kleijnen, 2005).…”

Section: Calibration Validation and Sensitivity Analysismentioning

confidence: 99%

A Review of Modelling Tools for Implementation of the EU Water Framework Directive in Handling Diffuse Water Pollution

Yang

Wang

2009

Water Resour Manage

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A numerical catchment-scale model capable of simulating diffuse water pollution is necessary in sustainable environmental management for better implementation of the EU Water Framework Directive. This paper provides critical reviews of most popular and free models for diffuse water modelling, with detailed sources and application potential. Based upon these reviews, further work of selecting and testing the HSPF model was carried out, with a case study in the Upper Bann Catchment, NorthernIreland. The calibrated and validated HSPF model can well represent the characteristics of surface water quantity and quality. Climate change scenario evaluation in five years showed that when the annual mean temperature increase 3°C the mean yearly total runoff volume will decrease by 11.1% and the mean daily river flow 11.4%. If 20% crop and pasture land is converted into forest land in the study area, the mean river concentration of nitrate, nitrite, NH 4 and PO 4 in five years will decrease by 19.4%, 33.3%, 31.3% and 31.3% respectively. When applying filter strip method in 80% crop and pasture land in the area, the reduction of the mean concentration of nitrate, nitrite, NH 4 and PO 4 in five years will be 15.3%, 33.3%, 31.3%, and 5.6% respectively. This Software availabilitySoftware name/source: all reviewed software are mentioned in the text.

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Section: Calibration Validation and Sensitivity Analysismentioning

confidence: 99%

A Review of Modelling Tools for Implementation of the EU Water Framework Directive in Handling Diffuse Water Pollution

Yang

Wang

2009

Water Resour Manage

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“…In spite of efficient nutrient management practices, agricultural activities, such as application methods and storage, are probably the most significant anthropogenic sources of NO 3 -N contamination in groundwater (Oyarzun et al, 2007). Current agricultural practices (application methods, application rates and storage) while achieving high nutrient efficiency and nutrient management cannot avoid some nutrient losses to surface and groundwater.…”

Section: Introductionmentioning

confidence: 99%

Factors affecting nitrate distribution in shallow groundwater under a beef farm in South Eastern Ireland

Fenton

Richards

Kirwan

et al. 2009

Journal of Environmental Management

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a b s t r a c tGroundwater contamination was characterised using a methodology which combines shallow groundwater geochemistry data from 17 piezometers over a 2 yr period in a statistical framework and hydrogeological techniques. Nitrate-N (NO 3 -N) contaminant mass flux was calculated across three control planes (rows of piezometers) in six isolated plots. Results showed natural attenuation occurs on site although the method does not directly differentiate between dilution and denitrification. It was further investigated whether NO 3 -N concentration in shallow groundwater (<5 m below ground level) generated from an agricultural point source on a 4.2 ha site on a beef farm in SE Ireland could be predicted from saturated hydraulic conductivity (K sat ) measurements, ground elevation (m Above Ordnance Datum), elevation of groundwater sampling (screen opening interval) (m AOD) and distance from a dirty water point pollution source. Tobit regression, using a background concentration threshold of 2.6 mg NO 3 -N L À1 showed, when assessed individually in a step wise procedure, K sat was significantly related to groundwater NO 3 -N concentration. Distance of the point dirty water pollution source becomes significant when included with K sat in the model. The model relationships show areas with higher K sat values have less time for denitrification to occur, whereas lower K sat values allow denitrification to occur. Areas with higher permeability transport greater NO 3 -N fluxes to ground and surface waters. When the distribution of Cl À was examined by the model, K sat and ground elevation had the most explanatory power but K sat was not significant pointing to dilution having an effect. Areas with low NO 3 concentration and unaffected Cl À concentration points to denitrification, low NO 3 concentration and low Cl À chloride concentration points to dilution and combining these findings allows areas of denitrification and dilution to be inferred. The effect of denitrification is further supported as mean groundwater NO 3 -N was significantly (P < 0.05) related to groundwater N 2 /Ar ratio, redox potential (Eh), dissolved O 2 and N 2 and was close to being significant with N 2 O (P ¼ 0.08). Calculating contaminant mass flux across more than one control plane is a useful tool to monitor natural attenuation. This tool allows the identification of hot spot areas where intervention other than natural attenuation may be needed to protect receptors.

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“…Rainfed quinoa and quinoa with irrigation restricted to flowering and early grain filling were studied during the 2005-2006 and 2006-2007 growing seasons. Results showed that irrigation of quinoa with saline water and/or capillary rise from a saline shallow water table could result in significant salt accumulation in the root zone after just 1 year (Geerts et al, 2008) In Chile, effects were reported of agricultural activities on water pollution. A sensitivity analysis and a preliminary short-term, site-scale performance assessment of analytical soil and groundwater nitrate transport were carried out (Oyarzun et al, 2007). Both the nitrate flux from the vadose zone and nitrate groundwater concentration are mainly influenced by the initial soil nitrogen levels, water input, and soil porosity.…”

Section: Water and Soil Quality In Arid And Semi-arid Regions In Latimentioning

confidence: 99%

Environmental Effects of Irrigation in Arid and Semi-Arid Regions

Fernández-Cirelli

Arumí²,

Rivera³

et al. 2009

Chilean J. Agric. Res.

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This article reviews the state of the art with respect to the environmental effects of irrigated agriculture on water and soil quality in arid and semi-arid regions on a field scale. Information is scarce and fragmentary. Examples in selected areas of other arid and semi-arid regions in the world clearly show the importance of studying the environmental impact of irrigation practices on water and soil quality. Studies mainly refer to waterlogging and salinization. As regards agrochemicals, fertilizers have been taken into account through nitrate leaching. The impact of micropollutants such as pesticides and heavy metals on water and soil quality is studied mainly by modeling. Pharmaceutical compounds emerge as pollutants when wastewater is used for irrigation without any previous treatment, situation which is now the object of new studies. There is an obvious need to study in-depth knowledge related to appropriate technologies for the use, treatment, and reuse of wastewater which is a valuable resource in arid and semi-arid regions.

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Sensitivity analysis and field testing of the RISK-N model in the Central Valley of Chile

Cited by 31 publications

References 27 publications

A Review of Modelling Tools for Implementation of the EU Water Framework Directive in Handling Diffuse Water Pollution

A Review of Modelling Tools for Implementation of the EU Water Framework Directive in Handling Diffuse Water Pollution

Factors affecting nitrate distribution in shallow groundwater under a beef farm in South Eastern Ireland

Environmental Effects of Irrigation in Arid and Semi-Arid Regions

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