Determination of recharge, storage and flow characteristics of a karst aquifer using multi-method approaches (Kocaeli, Turkey)

Şener, Ahmet; Yolcubal, İrfan; Sanğu, Ercan

doi:10.1007/s10040-020-02183-1

Cited by 11 publications

(3 citation statements)

References 18 publications

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“…Furthermore, evaporite rocks within the Arab and Jubaila Formations are locally dissolved by groundwater, creating subsidence depressions and sinkholes (Figure 5d); [24]. This process enhances the effective permeability of the aquifer and could allow fast recharge [25]. Recharging of the Arab/Jubaila aquifer significantly reduces the potential surface recharge to the Biyadh aquifer in WS, as any surface runoff arriving from the west has first to pass the Arab/Jubaila outcrops.…”

Section: Hydrogeology and Climate Of The Study Areamentioning

confidence: 99%

Agricultural Impacts on Groundwater Resources in Central Saudi Arabia: Insights from Remote Sensing and Geographic Information Systems

Alharbi

2023

Preprint

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Agricultural activities profoundly affect groundwater levels in Saudi Arabia. The Al Kharj and Wadi Sahba areas, central Saudi Arabia, produce groundwater mainly from the Jurassic Arab/Jubaila aquifer and the overlying Cretaceous Biyadh aquifer. A geographic information system analysis and linear regression analyses show that from 1978 to 2016, significant agricultural overexploitation of the area’s fossil groundwater was associated with groundwater level drops of ~104 m in Al Kharj and ~48 m in Wadi Sahba. The estimated total volume of groundwater withdrawal across both aquifers during this period of wheat and alfalfa irrigation was ~27 billion m3. Landsat image analysis shows that agricultural land use decreased by ~66% over the same period due to overexploitation. The 2016 phase-out of alfalfa farming was associated with increases in groundwater levels: ~26 m in the Arab/Jubaila aquifer and ~3 m in the Biyadh aquifer. This recovery was likely due to lateral flow from surrounding fossil water within the aquifer given the absence of significant surface recharge. Model-based evaluation of surface recharge of the aquifer reveals very low potential for surface infiltration, with almost no recharge into the deep aquifer. Assuming that recovery continues at the present rate, the average groundwater level for the Arab/Jubaila aquifer is expected to reach 98 m below ground level in 2025 and 74 m below ground level in 2030.

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Section: Hydrogeology and Climate Of The Study Areamentioning

confidence: 99%

Agricultural Impacts on Groundwater Resources in Central Saudi Arabia: Insights from Remote Sensing and Geographic Information Systems

Alharbi

2023

Preprint

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“…Due to the strong heterogeneity of the aquifer medium, effectively identifying the hydrogeological characteristics of the karst aquifer system has become one of the difficulties in the current study (Guo et al, 2020; Milanovic, 2007; Peely et al, 2018; Ahmet et al, 2020). The physical process of groundwater flow in the karst aquifer is mainly determined by the characteristics of the complex conduit‐matrix system, and numerous techniques are available for identifying the features of the karst groundwater system, including hydrogeochemical analysis (Adji et al, 2017), tracer tests (Benischke, 2021), and spring hydrograph analyses (Chang et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Rainfall events‐spring flow relationship and karst flow component analysis in a conduit‐matrix coupled system

Li,

Shu,

et al. 2023

Hydrological Processes

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Karst aquifers have complex structures and high heterogeneity, making it difficult to describe their hydrogeological characteristics. An essential tool for comprehending karst hydrogeology and identifying the hydraulic characteristics of the karst system is a quantitative analysis of the recession process of the karst spring hydrograph. The recession process of the spring hydrograph following a rainfall event can be utilized to assess the internal structure of the karst system as it relates to the karst aquifer's response to rainfall events. In this study, a laboratory physical experiment model is built based on typical karst hydrogeological circumstances, and a corresponding combined discrete‐continuum (CDC) numerical model is established, coupling conduit and matrix. The primary goal of this paper is to investigate how the recession process of the spring hydrograph responds to various rainfall events. Different rainfall intensities with the same rainfall duration and various rainfall intensities with the same rain amount are examples of rainfall patterns. The simulation results showed that the pattern of rainfall events affects the recession process of the spring hydrograph, and the recession coefficient of the corresponding recession stage, the proportion of water volume released by conduit and matrix with the different rainfall patterns are calculated and analysed, and the impact of rainfall events on the recession coefficient of spring hydrograph and the spring water composition has been explored. The research results can provide a reference and basis for the management of water resources in karst areas.

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“…Therefore, for the protection and sustainable management of groundwater resources, it is critical to study the recharge-discharge mechanism of a karst aquifer and determine the recharge areas [5]. These aquifers are very complex systems, as each one has its own distinctive characteristics [6,7].…”

Section: Introductionmentioning

confidence: 99%

Karst Recharge Areas Identified by Combined Application of Isotopes and Hydrogeological Budget

Iacurto

Grelle

Filippi

et al. 2021

Water

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The identification of recharge areas in karst aquifers allows us to perform sustainable management of these groundwater resources. Stable isotopes (δ18O and δ2H) have been largely used to provide information about recharge elevation in many mountainous regions. In this paper, an improved version of a recent “isotope-driven model”, for the identification of recharge areas, was applied to Capodacqua di Spigno Spring (south of the Latium region). The model upgrade consists of a preliminary check procedure to estimate the degree of influence of the rainfall’s isotopic variability on the spring water. This additional procedure gives us an indication of the reliability of the model and its applicability conditions. Moreover, the dataset of the spring was updated to analyze the degree of reliability of the isotope-driven model. The purpose of this study was to combine the previously mentioned isotope-driven model with hydrogeological tools. A quantitative study of the basin, based on the estimation of the average monthly infiltration volume, was performed by using the inverse hydrogeological water budget. In this way, the qualitative model for the recharge areas’ estimation was validated by a quantitative hydrogeological tool. Both models show that, for karst mountain basins, the recharge areas decrease as the average recharge elevations increase, including areas at high altitudes.

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Determination of recharge, storage and flow characteristics of a karst aquifer using multi-method approaches (Kocaeli, Turkey)

Cited by 11 publications

References 18 publications

Agricultural Impacts on Groundwater Resources in Central Saudi Arabia: Insights from Remote Sensing and Geographic Information Systems

Agricultural Impacts on Groundwater Resources in Central Saudi Arabia: Insights from Remote Sensing and Geographic Information Systems

Rainfall events‐spring flow relationship and karst flow component analysis in a conduit‐matrix coupled system

Karst Recharge Areas Identified by Combined Application of Isotopes and Hydrogeological Budget

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