Groundwater dependent ecosystems in coastal Mediterranean regions: Characterization, challenges and management for their protection

Erostate, Mélanie; Huneau, Frédéric; Garel, Émilie; Ghiotti, Stéphane; Vystavna, Yuliya; Garrido, Marie; Pasqualini, Vanina

doi:10.1016/j.watres.2019.115461

Cited by 89 publications

(41 citation statements)

References 144 publications

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“…The Almonte-Marismas aquifer's complex sedimentary origins, ecological richness and groundwater over-exploitation are three challenging factors for groundwater resource management decisions [27,29]. The combined effect of agricultural activities, industry and tourism have added to climate change and led to a general decrease of GWL, changing the hydrodynamics in the area [22]. As a result, several groundwater-dependent temporal ponds have disappeared [30].…”

Section: Study Sitementioning

confidence: 99%

“…The over-exploitation of the area is attributed to uncontrolled, unsustainable and, in many cases, illegal growth of intensively irrigated agriculture over recent decades [21]. Unregulated and illegal pumping must be taken into account in groundwater management evaluations [22]. When long GWL time series are available, one way to evaluate the agricultural expansion effect on the aquifer dynamics is a deep study of the GWL by using clustering tools.…”

Section: Introductionmentioning

confidence: 99%

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Clustering Groundwater Level Time Series of the Exploited Almonte-Marismas Aquifer in Southwest Spain

Naranjo‐Fernández

Guardiola‐Albert

Aguilera

et al. 2020

Water

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Groundwater resources are regularly the principal water supply in semiarid and arid climate areas. However, groundwater levels (GWL) in semiarid aquifers are suffering a general decrease because of anthropic exploitation of aquifers and the repercussions of climate change. Effective groundwater management strategies require a deep characterization of GWL fluctuations, in order to identify individual behaviors and triggering factors. In September 2019, the Guadalquivir River Basin Authority (CHG) declared that there was over-exploitation in three of the five groundwater bodies of the Almonte-Marismas aquifer, Southwest Spain. For that reason, it is critical to understand GWL dynamics in this aquifer before the new Spanish Water Resources Management Plans (2021–2027) are developed. The application of GWL series clustering in hydrogeology has grown over the past few years, as it is an extraordinary tool that promptly provides a GWL classification; each group can be related to different responses of a complex aquifer under any external change. In this work, GWL time series from 160 piezometers were analyzed for the period 1975 to 2016 and, after data pre-processing, 24 piezometers were selected for clustering with k-means (static) and time series (dynamic) clustering techniques. Six and seven groups (k) were chosen to apply k-means. Six characterized types of hydrodynamic behaviors were obtained with time series clustering (TSC). Number of clusters were related to diverse affections of water exploitation depending on soil uses and hydrogeological spatial distribution parameters. TSC enabled us to distinguish local areas with high hydrodynamic disturbance and to highlight a quantitative drop of GWL during the studied period.

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Section: Study Sitementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Clustering Groundwater Level Time Series of the Exploited Almonte-Marismas Aquifer in Southwest Spain

Naranjo‐Fernández

Guardiola‐Albert

Aguilera

et al. 2020

Water

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“…The high spatial variability of SGD fluxes results on locally important fluxes in specific areas [15]. The supply of solutes to coastal waters through SGD directly impact the productivity of coastal ecosystems [42][43][44]. SGD can also supply dissolved contaminants to the coastal ocean derived from anthropogenic sources (e.g., agriculture, industrial, mining activities, domestic wastewaters) (e.g., [45,46]), which can endanger the coastal ecosystems and the well-being of local population living around them.…”

Section: Discussionmentioning

confidence: 99%

Thermal-Based Remote Sensing Solution for Identifying Coastal Zones with Potential Groundwater Discharge

Londoño-Londoño

Melo

Nascimento

et al. 2022

JMSE

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Submarine Groundwater Discharge (SGD) is an essential process of the hydrological cycle by hydraulically connecting the land and sea. However, the occurrence, importance and effects of SGD remain largely underexplored. Here, we developed and validated a straightforward tool for mapping potential SGD areas in coastal ecosystems of Portugal. Our approach was based on the premise that relatively cooler groundwater discharging to warmer coastal waters manifests in the thermal band of satellite imagery acquired during the summer months. We then used Landsat 8 thermal infrared imagery (TIR) to derive sea surface temperature and standardized temperature anomalies maps. The results confirmed the capacity of TIR remote sensing for identifying SGD areas. The thermal analysis enabled us to acquire a useful visual-spatial correlation between the location of thermal anomalies and potentiometric surfaces of coastal aquifers. This way, over 20 potential SGD areas were identified. Our study makes an important contribute to our current SGD research status by developing a cost-efficient tool which can be used as a first level approach for large areas. Further investigation is needed to quantify the SGD and its potential effect in the receiving ecosystems, especially those located within environmentally protected areas.

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“…In fact, GDEs are often located in flat coastal areas (e.g., wetlands, swamps, riverine plains, etc.) that are also ideal environments for agricultural activities [170]. This combination makes most of these habitats prone to adverse effects of water pollution induced by human activities.…”

Section: Future Trends In the Application Of Groundwater Vulnerabilit...mentioning

confidence: 99%

Denitrification in Intrinsic and Specific Groundwater Vulnerability Assessment: A Review

2021

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Several groundwater vulnerability methodologies have been implemented throughout the years to face the increasing worldwide groundwater pollution, ranging from simple rating methodologies to complex numerical, statistical, and hybrid methods. Most of these methods have been used to evaluate groundwater vulnerability to nitrate, which is considered the major groundwater contaminant worldwide. Together with dilution, the degradation of nitrate via denitrification has been acknowledged as a process that can reduce reactive nitrogen mass loading rates in both deep and shallow aquifers. Thus, denitrification should be included in groundwater vulnerability studies and integrated into the various methodologies. This work reviewed the way in which denitrification has been considered within the vulnerability assessment methods and how it could increase the reliability of the overall results. Rating and statistical methods often disregard or indirectly incorporate denitrification, while numerical models make use of kinetic reactions that are able to quantify the spatial and temporal variations of denitrification rates. Nevertheless, the rating methods are still the most utilized, due to their linear structures, especially in watershed studies. More efforts should be paid in future studies to implement, calibrate, and validate user-friendly vulnerability assessment methods that are able to deal with denitrification capacity and rates at large spatial and temporal scales.

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Groundwater dependent ecosystems in coastal Mediterranean regions: Characterization, challenges and management for their protection

Cited by 89 publications

References 144 publications

Clustering Groundwater Level Time Series of the Exploited Almonte-Marismas Aquifer in Southwest Spain

Clustering Groundwater Level Time Series of the Exploited Almonte-Marismas Aquifer in Southwest Spain

Thermal-Based Remote Sensing Solution for Identifying Coastal Zones with Potential Groundwater Discharge

Denitrification in Intrinsic and Specific Groundwater Vulnerability Assessment: A Review

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