Groundwater problems in the karstic aquifers of the Dobrich region, northeastern Bulgaria

Pulido−Bosch, A.; López-Chicano, M.; Calaforra, J. M.; Vache, M. L. Cal; Machkova, M.; Dimitrov, Dimitar; Velikov, Borislav; Pentchev, P.

doi:10.1080/02626669909492289

Cited by 8 publications

(3 citation statements)

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“…It is obvious that the development of the HEPP influenced the smoothing down of the ACF. In both the cases, the autocorrelation coefficients reach a value of 0·2 in 32 days, which can be explained by the existence of the memory effect of the aquifer (Mangin, 1984; Larocque et al , 1998), and by the influence of the base flow component (Padilla et al , 1994: Cerón et al , 1999; Pulido‐Bosch et al , 1999).…”

Section: Detailed Data Presentationmentioning

confidence: 92%

A Sensitive and Selective Fluorescent Probe for Cysteine Based on a New Response‐Assisted Electrostatic Attraction Strategy: The Role of Spatial Charge Configuration

Zhou

Jin

Sun

et al. 2013

Chemistry A European J

101

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A new strategy for fast fluorescent detection of cysteine (Cys), based on a response-assisted electrostatic attraction, is demonstrated. By utilizing this strategy, we designed and synthesized three fluorescent probes for the specific detection of Cys under actual physiological conditions. The probe m-CP, a coumarin fluorophore conjugated with a substituted methyl pyridinium group through an unsaturated ketone unit, showed highly selective and sensitive detection for cysteine (Cys) over homocysteine (Hcy) and glutathione (GSH). The kinetic analysis indicated that the sensing process was highly accelerated (a response time less than 1 min) by the response-assisted electrostatic attraction. More importantly, control experiments with isomeric probes first demonstrated that the spatial charge configuration of the probe played an important role in Cys-preferred selectivity and kinetic rate acceleration. Furthermore, the practical utility of the probe m-CP in the fluorescent labeling of Cys residues within proteins was demonstrated. Finally, these probes were employed in living cell imaging with HeLa cells, in which it displayed satisfactory cell permeability and enabled us to distinguish active thiols in the cytoplasm, nucleus, and mitochondria.

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Section: Detailed Data Presentationmentioning

confidence: 92%

A Sensitive and Selective Fluorescent Probe for Cysteine Based on a New Response‐Assisted Electrostatic Attraction Strategy: The Role of Spatial Charge Configuration

Zhou

Jin

Sun

et al. 2013

Chemistry A European J

101

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“…One of the most important aquifer systems in Romania is the deep groundwater body coded RODL06 (international designation EB088), which is hosted in a Late Jurassic-Early Cretaceous (J 3 -K 1 ) carbonate complex of the karstic-fractured type [10][11][12][13][14][15][16][17][18]. This transboundary complex of Oxfordian-Barremian limestones and dolomites is developed in the southern and southeastern parts of Romania (the Wallachian and South Dobrogea sectors of the Moesian Platform) and in the entire northern part of Bulgaria.…”

Section: Introductionmentioning

confidence: 99%

“…The exploited groundwater is used for domestic purposes/the drinking water supply, industry, and agriculture. South of the study area, in northeastern Bulgaria (Dobrich district), the J 3 -K 1 aquifer has a geothermal character, with temperatures of 32-41 • C in Balchik, Cape Kaliakra, and Shabla areas, reaching even 45-52 • C in the Varna region and providing thermal energy for coastal resorts [13,14]. This groundwater body has a total area of 24,374 km 2 , out of which 11,340 km 2 are within the Romanian territory, with approximately 4500 km 2 in the South Dobrogea sector [12].…”

Section: Introductionmentioning

confidence: 99%

Groundwater Exploration in Carbonate Reservoirs Using Borehole Investigations: A Case Study from South Dobrogea, Romania

Niculescu,

Bucur,

Talmaciu

2024

Energies

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The Late Jurassic–Early Cretaceous (J3–K1) transboundary aquifer is the most important groundwater body in southern–southeastern Romania, shared with Bulgaria and hosted in karstic–fractured carbonates. We conducted an integrated evaluation of this aquifer by analyzing three 700 m deep groundwater exploration–exploitation boreholes, which intercepted it in the Cernavodă area (South Dobrogea region). The evaluation was based on geophysical wireline logging, drilling information, and borehole production tests. A K-means clustering of the logging data was performed for lithology typing, formation boundaries identification, and the delineation of probable producing intervals associated with secondary porosity development. Petrophysical interpretation was carried out via depth-constrained (zonal) inversion, using multimineral models, the estimated formation boundaries, and variable uncertainties for the main input logs. The optimal interpretation models were correlated with borehole testing results to gain insight into the hydrogeological properties of the aquifer complex. The fractured–vuggy interval with the highest water-producing potential was identified in the lower section of the J3-age Rasova Formation (639–700 m depth), comprising mainly undolomitized limestones. A southeast-to-northwest trend of increasing productivity of the boreholes, correlated with an increasing lateral dolomitization intensity within the Rasova Formation, suggests a highly heterogeneous character of the aquifer. The differences in productivity are due not only to local porosity variations but also to various degrees of pore space connectivity that are related to the amount of fracturing or karstification. The novel findings of this study have important practical implications for the optimal placement, design, and drilling program of future groundwater exploitation boreholes in the Cernavodă area and neighboring sectors.

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Groundwater problems in the karstic aquifers of the Dobrich region, northeastern Bulgaria

Cited by 8 publications

References 1 publication

A Sensitive and Selective Fluorescent Probe for Cysteine Based on a New Response‐Assisted Electrostatic Attraction Strategy: The Role of Spatial Charge Configuration

A Sensitive and Selective Fluorescent Probe for Cysteine Based on a New Response‐Assisted Electrostatic Attraction Strategy: The Role of Spatial Charge Configuration

Groundwater Exploration in Carbonate Reservoirs Using Borehole Investigations: A Case Study from South Dobrogea, Romania

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