FACTORS INFLUENCING KARST AQUIFER RECHARGE AS EVIDENCED THROUGH VADOSE DYE TRACING

Karst aquifers are indispensable, yet vulnerable, resources; therefore, they require a comprehensive protection strategy. Since springs are the terminal points of the karst flow systems, knowledge of their distribution is a key element for the better understanding of groundwater flow, availability and vulnerability. The present study aims to introduce a data-driven analysis by the application of a spatial statistical technique (Weights of Evidence (WofE)) for the evaluation of factors influencing spring distribution in karst areas. A workflow was developed for investigating two questions: where will the springs locate, and where will the permanent springs evolve? This workflow has the potential for application to unconfined karst areas. This enhanced approach was applied to an unconfined transboundary aquifer, the Gömör–Torna Karst (HU and SK). The roles of five factors was statistically investigated: terrain elevation, distance to faults, distance of the carbonate–non-carbonate rock contact, distance to sinkholes, and precipitation distribution. The validation procedures confirmed the effectiveness of the approach. The resulting predictive maps are useful for decision-makers to delineate areas holding potential karst springs and to address water availability problems and protection measures. In addition, the WofE technique improved the comprehension of the geological conditions favourable for the formation of the springs.

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Numerical long-term assessment of managed aquifer recharge from a reservoir into a karst aquifer in Jordan

Journal of Hydrology ◽

10.1016/j.jhydrol.2016.06.058 ◽

2016 ◽

Vol 540 ◽

pp. 603-614 ◽

Cited By ~ 11

Author(s):

Julian Xanke ◽

Hervé Jourde ◽

Tanja Liesch ◽

Nico Goldscheider

Keyword(s):

Karst Aquifer ◽

Managed Aquifer Recharge ◽

Aquifer Recharge

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Migration characteristics of atrazine in porous media during managed aquifer recharge

Water Science & Technology Water Supply ◽

10.2166/ws.2021.204 ◽

2021 ◽

Author(s):

Xiuxiu Sun ◽

Weiping Wang ◽

Weidong Zhao ◽

Shisong Qu ◽

Qingyang Zheng

Keyword(s):

Yellow River ◽

Karst Aquifer ◽

Peak Time ◽

Aquifer Recharge ◽

Groundwater Velocity ◽

Sand Column ◽

Flow Rates ◽

Gravel Layer ◽

Sand And Gravel ◽

Adsorption Desorption

Abstract To study the influences of sand and gravel layer and groundwater velocity of Yufuhe River on atrazine migration, adsorption-desorption and sand column experiments were carried out. Results show that the adsorption capacity of montmorillonite, raw sand and washed sand to atrazine sequentially weakens. In different media, the time for atrazine concentrations to peak in washed sand with motomorillonite (WSM), raw sand and washed sand is 60, 135 and 105 minutes respectively, and the peak concentration accounts for 84, 90 and 95% of the initial concentrations. Under different flow rates, the peak time in washed sand at flow rates of 100, 150 and 200 mL/min is 135, 105 and 75 minutes, and the peak time in WSM is 90, 60 and 45 minutes, respectively. Results from this study indicate that increasing flow velocity and suspended colloids concentrations can promote the migration of atrazine in aquifers, while the presence of clay minerals in sand and gravel layer can reduce atrazine migration. Thus, during Yellow River water recharging, the sand and gravel layer of Yufuhe River is helpful to protect the aquifer, but the colloids-associated migration of atrazine can contaminate groundwater in underlying karst aquifer.

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Historical analysis of a karst aquifer: recharge, water extraction, and consumption dynamics on a tourist island (Cozumel, Mexico)

Annales de Limnologie - International Journal of Limnology ◽

10.1051/limn/2021013 ◽

2021 ◽

Vol 57 ◽

pp. 16

Author(s):

Gerardo Hernández-Flores ◽

Martha Angélica Gutiérrez-Aguirre ◽

Adrián Cervantes-Martínez ◽

Ana Elizabeth Marín-Celestino

Keyword(s):

Catchment Area ◽

Water Resource Management ◽

Karst Aquifer ◽

Historical Analysis ◽

Water Extraction ◽

Groundwater Extraction ◽

Aquifer Recharge ◽

Monthly Data ◽

Cozumel Island ◽

Increasing Trends

On Cozumel Island, access to freshwater depends on the extraction of the resource from the aquifer located north of the island (catchment area). Water resource management on the island must be based on updated knowledge of the indicator dynamics related to the recharge of the aquifer, groundwater extraction and the distribution of the resource. In this study, trends, variations and time series of 30 years of monthly data for precipitation, temperature, evapotranspiration, and estimated aquifer recharge were calculated for the catchment area. Additionally, groundwater extraction, water consumption for the main uses over a 13-year period (monthly data), and the 5-year status of wells were considered. The results show decreasing trends in precipitation and estimated recharge volumes in the catchment area, in addition to increasing trends in mean air temperature, evapotranspiration, water extraction volumes and consumption by the commercial sector for the considered time periods. Additionally, an increase in dejected (77%) and reposed (38%) wells within the catchment area was observed. Evidence from this study suggests a dynamic behaviour of the analysed indicators over time that increases pressure on karstic, Caribbean aquifers for which monthly monitoring and data analysis are encouraged as the basis for adequate management.

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QUANTIFYING ALLUVIUM EFFECTS ON KARST AQUIFER RECHARGE: SHALLOW GROUNDWATER AND SURFACE WATER EXCHANGE IN THE UPPER NUECES RIVER, TEXAS

10.1130/abs/2017am-304808 ◽

2017 ◽

Author(s):

Caroline Croft Hackett ◽

◽

Marcus O. Gary ◽

Daniella M. Rempe

Keyword(s):

Surface Water ◽

Water Exchange ◽

Karst Aquifer ◽

Shallow Groundwater ◽

Aquifer Recharge ◽

Nueces River

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Options for managed aquifer recharge of karst aquifer of Vis island (Croatia)

10.5194/egusphere-egu21-12195 ◽

2021 ◽

Author(s):

Staša Borović ◽

Matko Patekar ◽

Josip Terzić ◽

Marco Pola ◽

Marina Filipović ◽

...

Keyword(s):

Karst Aquifer ◽

Seismic Refraction ◽

Geophysical Methods ◽

Managed Aquifer Recharge ◽

Water Levels ◽

Karst Region ◽

Karst Aquifers ◽

Aquifer Recharge ◽

Drinking Water Resources ◽

Karst Landforms

Vis, a small remote island in the Adriatic Sea, inhabited since the time of ancient Greeks and Romans, exhibits a unique historical and natural environment. With an area of 89.7 km2, the island is mostly composed of karstified carbonate rocks and belongs to Dinaric karst region, locus typicus for karst landforms. Its distance from the mainland is around 50 km from the city of Split, 147 km from the Italian coastline and 18 km from neighbouring Hvar island. The climate on the island is Mediterranean with dry and hot summer and mild, rainy and humid winter (Csa). Vis island, due to its remote location, is not connected to the mainland by submarine water pipeline so it has autonomous water supply due to favourable geological and hydrological conditions which enabled the formation of excellent karst aquifers. The majority of water is abstracted from drilled wells in the central part of the island (Korita extraction site), around 40 l/s, while additional quantities are obtained from coastal spring of Pizdica. Although predominantly of good quality, existing groundwater quantities on Vis are extremely vulnerable to the effects of climate change, namely increase in temperature, quantitative and temporal variability in precipitation trends as well as seawater intrusion. Moreover, Vis island is an attractive location for summer bathing tourism which causes the highest pressure on drinking water resources precisely during the hydrological minimum. An idea to apply artificial recharge of karst aquifer on Vis emerged during the 1970s, however, only on the theoretical level.Through the scope of the DEEPWATER-CE project, funded by Interreg Central Europe Programme, the aim is to develop implementation frame for managed aquifer recharge (MAR) solutions. Simplified, MAR is a process by which excess surface water is directed into the ground &#8212; either by spreading on the surface, by using recharge wells, or by altering natural conditions to increase infiltration to replenish an aquifer (DILLON et al., 2019). Globally, various designs of MAR schemes have successfully been implemented in unconsolidated aquifers, but there is little experience with artificially recharging karst aquifers (ROLF, 2017). A particular challenge for the technical implementation and operation of MAR is posed by strong hydraulic anisotropy and heterogeneity of karst aquifers and by their high vulnerability to contamination (XANKE, 2017). To investigate whether a MAR operation is feasible and suitable for karst aquifer on Vis, a detailed field and laboratory investigations were carried out. Field investigations included in-situ measurements of physicochemical parameters on water samples from springs and boreholes, groundwater monitoring (conductivity, temperature and water levels), geophysical methods (ERT, magnetotellurics, and seismic refraction) and structural measurements. Laboratory analyses included measurements of stabile water isotopes, and principal cations and anions. Hence, by conducting extensive investigations, coupled with historical data and previous research, a foundation for implementing efficient and sustainable management of karst aquifer through MAR on Vis island will be provided.&#160;

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