Assessing groundwater pollution hazard changes under different socio-economic and environmental scenarios in an agricultural watershed

Lima, María Lourdes; Romanelli, Asunción; Massone, Héctor

doi:10.1016/j.scitotenv.2015.05.026

Cited by 21 publications

(8 citation statements)

References 26 publications

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“…In recent years, numerical modeling has been increasingly applied to deal with a wide range of hydrogeological issues, concerning mainly groundwater flow and contaminant movement in aquifers [29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Morphogenesis of a Floodplain as a Criterion for Assessing the Susceptibility to Water Pollution in an Agriculturally Rich Valley of a Lowland River

Sieczka

Bujakowski

Falkowski

et al. 2018

Water

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This study presents the results of the influence of the specific geological landforms occurring in a lowland river floodplain on the recharge and drainage conditions in an agricultural area. Particular attention has been paid to the presence of the buried erosional channels of flood waters, which may constitute the preferential paths for migration of agricultural contaminants. Moreover, the changes of effective infiltration which affect the hydrogeological regime of the tested area were analyzed. Priority was also given to the use of laboratory techniques in order to determine the parameters influencing the contaminant migration in the soil-water environment for the purpose of hydrogeological modeling. Laboratory tests, based on a column experiment, were performed in a Trautwein apparatus with reference to the constant head procedure, using conservative and reactive markers. The parameters of advection, dispersion, and sorption, obtained in the laboratory experiment were then used as the input data for the hydrodynamic model of groundwater flow and contaminant migration in the research area. Based on the created digital model of groundwater flow, the multi-variant analysis of the effect of specific geological features on the conditions of contaminant transport in a valley was performed. The presented tools and methods contributed to a significant increase in the accuracy of recognizing zones susceptible to water pollution and should be adopted in other valley areas exposed to contamination.

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Section: Introductionmentioning

confidence: 99%

Morphogenesis of a Floodplain as a Criterion for Assessing the Susceptibility to Water Pollution in an Agriculturally Rich Valley of a Lowland River

Sieczka

Bujakowski

Falkowski

et al. 2018

Water

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“…The land-use requirements module is used to calculate future area demands, which is a key parameter affecting the iterations of the CLUE-S model. It can be estimated by a statistical model [52,53,[69][70][71][72], a system dynamics model [73,74], a professional model [75,76] and so forth. In this study, linear regression and scenario analysis were used to predict the future area demands for 2022-2037, as described in Section 3.3.…”

Section: Clue-s Modelmentioning

confidence: 99%

Spatio-Temporal Simulation of Mangrove Forests under Different Scenarios: A Case Study of Mangrove Protected Areas, Hainan Island, China

2021

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Mangrove forests are important woody plant communities that grow in the intertidal zone between land and sea. They provide important social, ecological and economic services to coastal areas. In recent years, the growth environment of mangrove forests has been threatened. Mangrove forests have become one of the most endangered ecosystems in the world. To better protect mangrove forests, effective monitoring methods are essential. In this study, a spatio-temporal simulation method for mangrove forests was proposed in the mangrove protected areas of Hainan Island, China. This method compared the simulation accuracy of different models in terms of spatial characteristics, evaluated the applicability of driving factors in mangrove simulation and predicted the future spatio-temporal distribution and change trends of mangrove forests under different scenarios. The simulation results of different models showed that AutoRF (random forest with spatial autocorrelation) performs best in spatial characteristic simulation. Driving factors such as the Enhanced Vegetation Index (EVI), various location indices and the spatial autocorrelation factor can significantly improve the accuracy of mangrove simulations. The prediction results for Hainan Island showed that the mangrove area increased slowly under a natural growth scenario (NGS), decreased significantly under an economic development scenario (EDS) and increased significantly under a mangrove protection scenario (MPS) with 4460, 2704 and 5456 ha respectively by 2037. The contraction of mangrove forests is closely related to the expansion of aquaculture ponds, building land and cultivated land. Mangrove contraction is more severe in marginal or fragmented areas. The expansion of mangrove forests is due to the contraction of aquaculture ponds, cultivated land and other forests. The areas around existing mangrove forests and on both sides of the riverbank are typical areas prone to mangrove expansion. The MPS should be the most suitable development direction for the future, as it can reasonably balance economic development with mangrove protection.

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“…The flow was assumed to be at a constant rate and continuous. Because of the complexity of pollutants, nitrogen concentrations are often used as indicators of groundwater quality risk [23,32,33] The influence of gas and the effect of temperature gradient were not considered during the movement of water. The two-dimensional flow motion in an unsaturated medium can be described by the Richards equation [24]:…”

Section: Study-area Generalizationmentioning

confidence: 99%

“…Thus, the unsaturated zones have important delaying and degradation effects on pollutants entering the aquifer, and provide significant groundwater protection [22]. Lima et al [23] argued that the soil conditions of the unsaturated zone should be considered when constructing a decision system for groundwater-pollution management. Rebolledo et al [24] reported that soil texture above aquifers plays an important role in the attenuation of nitrogen.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Trinitrogen Migration and Transformation in the Unsaturated Zone at a Desert Contaminant Site (NW China) Using HYDRUS-2D

Zheng

Zhai

Xia

et al. 2018

Water

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The protection of an unsaturated zone is essential for groundwater-quality security. Neglecting pollutant changes in the saturated zone can affect the accuracy of groundwater-quality assessments. Unlike water sampling, the nonreproducibility of soil sampling complicates the observation of contaminant changes at different times in the same location. The HYDRUS-2D model, coupled with the Richards equation and the convection-dispersion equation, was applied to simulate the migration and transformation of high ammonia concentrations in wastewater in an unsaturated zone. Long-term field observations were carried out for trinitrogen (NH4+, NO2−, and NO3−) from 2015 to 2018 at a wastewater discharge site located in a desert area in northwest China. Samples were collected twice a month. The model was calibrated and validated using statistics and observation data. Variations in trinitrogen concentrations were simulated using the model and fitted well with the measured values. Simulation results for trinitrogen migration and transformation demonstrated that there was no enrichment on the ground surface. Contaminants attenuated rapidly in the unsaturated zone after wastewater discharge stopped. NH4+ was oxidized to NO2− and NO3− under nitrification, except in the anoxic subclay lenses. Subclay lenses were not considered in previous research. These lenses had high enrichment with contaminants and prevented secondary nitrification, which might have led to extremely low NO3− concentrations. The removal rate of contaminants by the unsaturated zone in natural conditions is as high as 76%, and contaminants could be degraded to acceptable levels within 10 years (3650 days) without artificial interventions. This indicates that the unsaturated zone can delay migration and degrade contaminants, and should be taken into consideration in groundwater-quality assessments.

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Assessing groundwater pollution hazard changes under different socio-economic and environmental scenarios in an agricultural watershed

Cited by 21 publications

References 26 publications

Morphogenesis of a Floodplain as a Criterion for Assessing the Susceptibility to Water Pollution in an Agriculturally Rich Valley of a Lowland River

Morphogenesis of a Floodplain as a Criterion for Assessing the Susceptibility to Water Pollution in an Agriculturally Rich Valley of a Lowland River

Spatio-Temporal Simulation of Mangrove Forests under Different Scenarios: A Case Study of Mangrove Protected Areas, Hainan Island, China

Simulation of Trinitrogen Migration and Transformation in the Unsaturated Zone at a Desert Contaminant Site (NW China) Using HYDRUS-2D

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