Groundwater characteristics within loessic deposits: the coastal springs of Los Acantilados, Mar del Plata, Argentina

Isla, Federico Ignacio; Londoño, Orlando Mauricio Quiroz; Cortizo, Luis Camilo

doi:10.1007/s12665-018-7766-y

Cited by 7 publications

(3 citation statements)

References 36 publications

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“…Additionally, in many cases, unconfined groundwater systems are located under or within of the loess deposits (el Etreiby & Laudelout, 1988). Numerous studies have investigated the possible impact of intensive agricultural cultivation on water quality of the loess groundwater systems (Baran, et al., 2007; el Etreiby & Laudelout, 1988; Huang et al., 2013; Isla et al., 2018; Keller et al., 2008; Wagner & Roberts, 1998).…”

Section: Methodsmentioning

confidence: 99%

A Comparative Study of Conceptual Model Complexity to Describe Water Flow and Nitrate Transport in Deep Unsaturated Loess

Turkeltaub

Jia

Zhu

et al. 2021

Water Resources Research

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Understanding nitrate migration through the deep vadose zone is essential for aquifer vulnerability assessments. The effect of variability of physical properties of the deep vadose zone on nitrate transport has been scarcely explored. Recently, deep nitrate storage profiles were determined in the vadose zone of the Loess Plateau of China. Using these observations along with measured soil properties, this study investigates the effect of loess vertical heterogeneity on water movement and nitrate transport through the deep vadose zone. Models of different complexity were established and calibrated. First, a simple piston flow and nitrate mass balance approach was calibrated to the observed nitrate storage. The results indicate that the total nitrate storage is estimated well, while the estimation of the distribution of nitrate is relatively poor. Subsequently, Richards' equation and the Advection‐Dispersion equation were evaluated. Three different conceptualizations of the numerical models were calibrated against deep vadose zone nitrate and water content observations: (1) one‐layer model assuming homogenous loess vadose zone; (2) a model that considers a hydraulic conductivity (Ks) decay function and (3) a model where the Miller‐Miller scaling factors are prescribed to account for changes of the hydraulic functions with depth. Accounting for the vertical Ks decay in the numerical models improved water flow performances. The study reveals the adequacy of implementing water flow and nitrate transport numerical models together with a simple representation of the vertical loess variability, for simulating nitrate migration in loess deep vadose zone environments.

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Section: Methodsmentioning

confidence: 99%

A Comparative Study of Conceptual Model Complexity to Describe Water Flow and Nitrate Transport in Deep Unsaturated Loess

Turkeltaub

Jia

Zhu

et al. 2021

Water Resources Research

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“…Ancient neighbourhoods as Los Acantilados and Los Lobos ourished again due to nancial supports but without planning and services. Domestic wells and septic sewages multiplied without a strategic assessment plan (Isla et al 2018).…”

Section: The Urbanization Of the Corrientes Shallow Lakementioning

confidence: 99%

The urbanization of coastal wetlands in Buenos Aires, Argentina

Isla

2023

Preprint

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Different coastal wetlands of Buenos Aires Province (Argentina) were already urbanised notwithstanding initiatives for a National Law declaring them as natural reserves subject to conservation. Coastal urban sprawls either at the Parana Delta or at coastal barriers demanded the drainage of these wetlands. At the delta, several isolated neighbourhoods were constructed, some of them without authorisation. The lottery proposed along the marshes of the Mar Chiquita coastal lagoon was forbidden in the past due to the floods of 1980 (Country Costa del Sol). Today, a new initiative (Lagos de Mar) has been temporarily cancelled within a trial that lasted several years. The Alfar neighbourhood was conceived during the middle of the XX century occupying another wetland (Corrientes lagoon) that was overfilled with sand dredged from the coastal dunes. The Reta coastal lagoon is becoming progressively flooded due to channels dredged at the watershed (Los Gauchos creek). Today, the neighbourhood Balneario Reta is growing at the flooding surroundings of this lagoon that receives marine water in occasion of episodic storms or exceptional high tides. Some of these villages are frequently flooded and these processes will be worse considering forecasted climatic trends.

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“…Therefore, the loess is also an important recharge source for most of these groundwater resources. Intensive agricultural cultivation of the loess sediments has raised concern about degradation of groundwater quality due to nitrate and other agrochemical sources in different parts of the world (Baran, Richert, & Mouvet, 2007;El Etreiby & Laudelout, 1988;Huang, Pang, & Yuan, 2013;Isla, Londoño, & Cortizo, 2018;Keller, Butcher, Smith, & Allen-King, 2008;Wagner & Roberts, 1998).…”

Section: The Loess Deposit and The Lpcmentioning

confidence: 99%

Prediction of regional‐scale groundwater recharge and nitrate storage in the vadose zone: A comparison between a global model and a regional model

Turkeltaub

Ascott

Gooddy

et al. 2020

Hydrological Processes

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Extensive nitrogen loads at the soil surface exceed plant uptake and soil biochemical capacity, and therefore lead to nitrogen accumulation in the deep vadose zone. Studies have shown that stored nitrogen in the vadose zone can eventually reach the water table and affect the quality of groundwater resources. Recently, global scale models have been implemented to quantify nitrate storage and nitrate travel time in the vadose zone. These global models are simplistic and relatively easy to implement and therefore facilitate analysis of the considered transport processes at a regional scale with no further requirements. However, the suitability of applying these models at a regional scale has not been tested. Here, we evaluate, for the first time, the performance and utility of global scale models at the regional scale. Applied to the Loess Plateau of China, we compare estimates of groundwater recharge and nitrate storage derived from global scale models with results from a regional scale approach utilizing the Richards and advection‐dispersion equations. The estimated nitrate storage was compared to nitrate observations collected in the deep vadose zone (>50 m) at five sites across the Loess Plateau. Although both models predict similar spatial patterns of nitrate storage, the recharge fluxes were three times smaller and the nitrate storage was two times higher compared with the regional model. The results suggest that global scale models are a potentially useful screening tool, but require refinement for local scale applications.

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Groundwater characteristics within loessic deposits: the coastal springs of Los Acantilados, Mar del Plata, Argentina

Cited by 7 publications

References 36 publications

A Comparative Study of Conceptual Model Complexity to Describe Water Flow and Nitrate Transport in Deep Unsaturated Loess

A Comparative Study of Conceptual Model Complexity to Describe Water Flow and Nitrate Transport in Deep Unsaturated Loess

The urbanization of coastal wetlands in Buenos Aires, Argentina

Prediction of regional‐scale groundwater recharge and nitrate storage in the vadose zone: A comparison between a global model and a regional model

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