Jeoloji Mühendisliği Bölümü Koleksiyonu

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https://hdl.handle.net/20.500.12428/2673

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Formation of Holocene paleosols in a relict sand dune sequence at Kıyıköy, Türkiye
(Tubitak Scientific & Technological Research Council Turkey, 2025) Erginal, Ahmet Evren; Bozcu, Mustafa; Yakupoğlu, Nurettin; Akbaş, Abdullah; Kaya, Hakan; Tunç, İsmail Onur
The paleoclimatic indicators from a relict dune and paleosol sequence observed south of Kıyıköy Port, NW Türkiye, provide insights into the variable paleoclimatic conditions in the western Black Sea coastal zone over the last 4700 yrs BP. The relict dune- paleosol sequence consists of reddish-brown coarse sands with abundant shells and overlying paleosol. Radiocarbon dating of Donax trunculus shells collected from the lowest part of the relict dune revealed the onset of sand deposition 4689 ± 123 yrs ago. The dark-colored paleosol layer, with an Rb/Sr ratio of 0.008, yielded an age of 287 ± 32 yrs cal BP. These findings indicate that the paleosol developed around the 1700s, during one of the coldest phases of the Little Ice Age. This layer is followed by a brown-colored buried soil, indicating a short-lived humid and rainy period, as evidenced by an Rb/Sr ratio of 0.42.
The Quaternary fluvial-lacustrine system in the Akarçay Basin (SW Anatolia): depositional environments and paleoclimatic interpretation
(Tubitak Scientific & Technological Research Council Turkey, 2025) Aktürk, Koray; Kapan, Sevinç
The Akarçay Closed Basin, located in southwest Anatolia, contains deformed formations and the drying Akşehir and Eber lakes. This study aimed to interpret the paleoenvironmental and paleoclimatic conditions of the Akşehir and Eber lakes, which are reported to have been connected during the Pleistocene. Based on sedimentological and mineralogical data, three different depositional subenvironments were defined, corresponding to the formation and development stages of the lake. Sedimentary facies analysis of the Pleistocene deposits in the basin revealed the following facies associations, listed from bottom to top: 1) an alluvial fan and fluvial facies association, representing the formation stage of the lake, which developed due to tectonic activity and a humid/wet climate; 2) a lakeshore facies association, corresponding to the expansion stage when the lake spread shallowly, and 3) a lake center facies association, corresponding to the closing stage when the lake began to dry, characterized by limited levels of clastic deposition under very shallow lake conditions. In the lakeshore and lake center facies association, Valvata piscinalis, Dreissena iconica and D. polymorpha species living in shallow waters and streams, as well as Laevicaspia caspia species living in mesohaline environments were identified. X-ray diffraction analysis was performed on the levels that best represented the facies associations in the basin, revealing that the dominant clay minerals in the sequence were illite and kaolinite. Combined evaluation of the sedimentological, mineralogical, and paleontological data suggests that the abundance of Valvata piscinalis and Dreissena iconica—both stream-dwelling species—at levels with increased kaolinite content indicates rainy and humid climatic periods when stream-fed conditions prevailed in the basin. Conversely, the dominance of Laevicaspia caspia and the intervals marked by illite deposition indicate cold and arid climatic periods.
Fractal Characterization of Crack Patterns in Intact Rocks Under Triaxial Compression
(Springer, 2025) Dinç Göğüş, Özge; Avşar, Elif; Çalık, Ayten
Understanding crack development in rocks under varying confining stresses is critical for assessing rock mass stability in engineering projects, such as tunnels, slopes, and underground storage facilities. This study employs fractal dimension (D) analysis to quantify crack complexity in diabase, ignimbrite, and marble subjected to triaxial compression, with implications for predicting environmental impacts of rock failure. Crack patterns were evaluated using digital image processing and the box-counting method. Results demonstrate that both confining stress and mineralogical composition significantly influence crack morphology and failure modes. Diabase exhibits highly branched cracks (higher D values) due to its interlocking grain texture, while marble produces simpler cracks (lower D values). The cracking behavior of ignimbrite lies between that of marble and diabase, characterized by curved cracks influenced by its weak matrix. Increasing confinement reduces D values, reflecting smoother cracks and transitions from tensile to shear-dominated failure. These findings highlight the utility of fractal analysis in geomechanics, offering quantitative insights into stress-induced damage evolution and its relevance to sustainable engineering applications.
The superiority of using the ESR dating method in mollusc shells compared to 14C and 230Th/234U: A case study at the eastern part of Konya closed basin, central Turkiye
(Pergamon-Elsevier Science Ltd, 2025) Ekici, Gamze; Akpınar Sayın, Ülkü; Delikan, Arif; Kapan, Sevinç; Bıyık, Recep; Demir, Ahmet; Işık, Mesut
The Konya Closed Basin in central Anatolia preserves Quaternary lacustrine sediments, providing critical evidence for regional paleoclimatic reconstructions. Accurate dating of these is essential for understanding Quaternary climate evolution in the area. In this study, fossil mollusc shells systematically collected from the eastern part of the basin were dated for the first time using ESR spectroscopy. Prior to dating analyses, comprehensive geological investigations and paleontological classifications were conducted. ESR spectra recorded at room temperature on both natural and gamma-irradiated samples revealed freely rotated CO2- radical signals at g = 2.0007. Kinetic studies confirmed the long-term stability of the CO2- radical, with high activation energies (similar to 1.3 eV) and thermal lifetimes exceeding similar to 10(6) years, reconfirming its reliability as a dating signal throughout the Quaternary period. Most ESR ages were derived from the 2.0007 signal, while the signal of the orthorhombic CO2- radical at g = 1.9973 was utilized for a few samples. Dose-response curves were best fitted to a single exponential saturation function and equivalent doses were calculated accordingly. ESR ages ranged from 138 to 6 ka, showing stratigraphic consistency with the sedimentary record. Comparative dating using C-14 AMS and Th-230/U-234 techniques demonstrated general agreement with ESR ages, although minor discrepancies were observed due to the open-system behavior of mollusc shells. Overall, the results support the chronological reconstruction of Holocene to Middle Pleistocene paleoenvironmental events in the Konya Closed Basin.
Simultaneous Adsorption of Arsenate and Chromate by Goethite: Effect of Humic Acid, Kaolinite, and Calcite
(Asce-Amer Soc Civil Engineers, 2025) Alidokht, Leila; Karaca, Öznur; Ulugergerli, Emin Uğur
This study designed laboratory-scale experiments to investigate the efficiency of the simultaneous adsorption of AsV and CrVI onto goethite nanorods (GN) and to evaluate the influence of humic acid (HA), calcite, and kaolinite, three selected geochemical components, on the adsorption efficiency and reaction mechanisms. The findings revealed that kaolinite, HA, and calcite were ineffective in adsorbing AsV from the solution. In contrast, GN exhibited a 66% adsorption efficiency for As. For CrVI, GN demonstrated the highest removal efficiency (90.8%), while HA showed the lowest performance (60%). The presence of CrVI in the solution did not significantly impact AsV adsorption by the adsorbents. However, HA, kaolinite, and calcite notably reduced the adsorption efficiency of GN toward AsV. Conversely, the adsorption of CrVI by all adsorbents was negatively influenced by the presence of AsV in the solution. X-ray photoelectron spectroscopy analysis supported the batch experiment results, confirming that no oxidation or reduction reactions occurred during the adsorption process, as the valence states of As and Cr remained unchanged from their initial states in the solution. The simultaneous adsorption of As and Cr by GN in mixed solutions, particularly in the presence of geochemical components, proved to be a complex process. Across all experiments, Cr adsorption was consistently hindered by the presence of As. These results provide valuable insights for designing remediation strategies for water contaminated with both chromate and arsenate. Tailoring the approach to the specific geochemical composition of the affected area can enhance the effectiveness of surface and groundwater remediation.
Enhanced Electrokinetic Remediation of Agricultural Soil: Assessment of Chromium (VI) Removal and Soil Property Alterations
(Taylor & Francis Inc, 2025) Mehta, Anjali; Kathuria, Tanisha; Taneja, Sonam; Kumar, Sudesh; Karaca, Öznur; Haritash, Anil Kumar
This study evaluated the efficiency of enhanced electrokinetics (EKR) in removing hexavalent chromium Cr (VI) from agricultural soil using three potent electrolyte solutions: citric acid (CA), EDTA, and Tween 80. Distilled water was used as a control experiment. Further, to understand the influence of the applied current across the soil column and the targeted areas, a length-wise as well as depth-wise distribution of Cr (VI) was analyzed. Additionally, the key properties of agricultural soil, such as organic matter, carbonate content and sulfate ions, were investigated to study both the effect of soil properties on the efficiency of EKR, and the alterations in soil properties due to the EKR treatment. The findings revealed that CA was the most effective enhancing agent in removing Cr (VI), with 37.5% removal, followed by EDTA (33.4%), distilled water (23.8%), and Tween 80 (22.8%). The chromate ions, Cr-EDTA complexes, and Cr-Cit complexes migrated toward the anode through electro-migration, resulting in higher Cr (VI) in analytes and S1 and S2 soil sections. The surfactant could not form a metal complex but caused the mobilization of organic matter and soil colloids, resulting in relatively lower removal rates. The depth-wise Cr (VI) distribution indicated higher Cr (VI) retention at the bottom and middle sections due to gravitational leaching and compact soil arrangement. EKR was effective in eliminating excess sulfate ions from the soil, while improving the availability of essential nutrients through organic matter mobilization. The application of CA-enhanced EKR over Cr (VI)-contaminated agricultural field can give promising remediation with minimum disturbance to the soil properties.
Removal of salinity from soil using the electrokinetic treatment method
(Emerald Group Publishing Ltd, 2025) Özentürk, Buse; Karaca, Öznur; Ulugergerli, Emin Uğur; Cameselle, Claudio
The effectiveness of electrokinetic remediation (EKR) in mitigating soil salinity was investigated using soil samples collected from Kavak Delta (Türkiye) to fulfil the purpose of desalinisation in coastal regions, maintain the ecological balance, and ensure long-term agricultural sustainability. The soil samples exhibited an average pH of 6.84, salinity of 9.33% (NaCl equivalent), and an electrical conductivity (EC) of 15.96 mS/cm, with a total dissolved solids (TDS) concentration of 10 214 ppm. Cation concentrations (Ca2+, Mg2+, K+, and Na+) were quantified by inductively coupled plasma atomic emission spectrometry, while anions were analysed through gravimetric (Cl−) and colorimetric/spectrophotometric methods (NO3− and SO42−). During EKR, a constant potential difference of 1 V/cm was applied across the electrodes for 23 days. Following the EKR, a noticeable decrease in salinity and EC was observed in the anode region (AR). The salinity was 8.9% around the cathode region (CR), similar to the initial value, but in the AR decreased to 3.7%. The average EC values were 4.01 and 17.23 mS/cm in the vicinity of AR and CR, respectively. The TDS value did not improve in the CR but reached 2570 ppm in the AR. These findings demonstrate the effectiveness of EKR in mobilising and redistributing salts towards the cathode, thereby reducing soil salinity in targeted areas.
Late Cenozoic stress states in the Datça and Bozburun Peninsulas, SE Aegean, Turkey
(Slovak Acad Sciences, Earth Science Inst, 2025) Demirci, Alper; Özden, Süha; Över, Semir; Gündoğdu, Erdem
The Datpa and Bozburun are E-W-oriented peninsulas located near the Pliny-Strabo Trench Zone and considered to be eastern continuations of the seismically-active Hellenic Subduction Zone. Although no catastrophic earthquakes were recorded on the peninsulas in the previous century, two large earthquakes of a magnitude of 6.6 (Mw) occurred in the Gulf of G & ouml;kova in the north, in 2017, and a magnitude of 7.1 (Mw) in the Gulf of Fethiye in the south was recorded in 1957. Therefore, the necessity to pay close attention and issue warnings regarding potential earthquakes in and around the peninsulas has been increasing. Inversion of fault slip vectors affecting both the Plio-Quaternary and Paleozoic units in the Datpa and Bozburun Peninsulas yields N-S, NE-SW, and NW-SE extensional stress states. The NW-SE trending Datpa Basin formed during the Plio-Quaternary under the NE-SW extensional regime. The inversion of the focal mechanisms for shallow earthquakes in the Datpa and Bozburun Peninsulas provides N-S and NW-SE extensional stress states. Extensional stress tensors obtained from both the fault planes measured, as well as the focal mechanisms of the shallow earthquakes, are related to the roll-back process of the African slab along the Hellenic Subduction Zone.
Citric Acid-Assisted Electrokinetic Remediation of Arsenic and Metal-Rich Acidic Mine Pond Sediments
(Mdpi, 2025) Karaca, Öznur
Mining activities in the study area have led to the formation of irregular depressions where rainwater accumulates, creating acidic mine ponds. The water in these ponds becomes contaminated through contact with mine wastes and bottom sediments, leading to the dispersion of toxic metals and metalloids into the surrounding environment and food chain. This study investigates electrokinetic remediation (EKR) of highly contaminated acidic mine pond sediments and evaluates the role of citric acid (CA) as a biodegradable and environmentally friendly chelating agent. The sediment was highly acidic (pH 3.35) and contained elevated concentrations of Al, Fe, Mn, and As. Laboratory-scale EKR experiments were conducted for 27 days under a constant potential gradient of 1 V/cm, using 0.1 M CA as the electrolyte. The results obtained from this study were compared with those obtained using deionised water (DIW) as the electrolyte. The results demonstrated that CA significantly enhanced metal mobility, leading to higher removal efficiencies for Al (82.4%), As (51.1%), Mn (32.9%), and Fe (29.5%) compared to DIW. The pH near the cathode remained more balanced, and metal precipitation was minimised. Furthermore, total energy consumption decreased by about 53% (from 551 to 262 kWh/m3), indicating improved process efficiency. These results reveal that CA-assisted EKR can be an effective and sustainable method for the remediation of highly acidic mine pond sediments.
Technological Optimization, Health Risk Reduction, and Economic Analysis of Electrokinetic Remediation of Cadmium-contaminated Soil
(Springer Int Publ Ag, 2025) Taneja, Sonam; Karaca, Öznur; Haritash, Anil Kumar
The electrokinetic remediation (EKR) technique was employed for cadmium (Cd)-contaminated soil to study the cross-effect of voltage gradient and electrolyte concentration on removal efficiency. Response Surface Methodology over Central Composite Design (CCD) was used to design the experiments. In addition, the effect of electrode material on EKR was investigated using two different electrodes, graphite, and stainless steel. The distribution and migration behavior of Cd in soil was explored through chemical speciation and sequential extraction procedure. The findings revealed that the voltage gradient and EDTA concentration were positively correlated with the removal efficiency at the optimized conditions of 2.5 V/cm and 0.15 M EDTA to achieve 27.8% removal in 10 h. The voltage gradient had a more profound effect on the removal efficiency as compared to EDTA concentration. The EKR treatment effectively reduced the bioavailability of Cd by removing water-soluble and exchangeable fractions and rendering the transformation of Cd to reducible and residual fractions. The Human Health Risk Assessment study was performed which revealed that EKR was successful in reducing the non-carcinogenic adverse effects by 29% and total carcinogenic risks from one in a thousand to one in a hundred thousand in adults, while children still exposed to high potential non-carcinogenic effects. The economic evaluation of all experiments concluded that the stainless steel electrode was more suited for Cd removal as compared to the graphite electrode with better removal (30%) and low specific cost (5.8 US$/g Cd). The study shows that EKR is successful in reducing the overall toxicity of Cd in soil and humans at a relatively low cost and less treatment time.
Author Correction: The role of mineralogical and textural complexity in the damage evolution of brittle rocks
(Nature Portfolio, 2025) Göğüş, Özge Dinç; Avşar, Elif; Develi, Kayhan; Çalık, Ayten
[No abstract available]
Soil remediation at coastal plains with the help of DC Resistivity Method
(Maden Tetkik Ve Arama Genel Müdürlüğü-MTA, 2025) Özentürk, Buse; Karaca, Öznur; Ulugergerli, Emin Uğur
The coastline of the Dardanos, a district of & Ccedil;anakkale, T & uuml;rkiye, suffers from saltwater intrusion due to excessive extraction of groundwater for domestic usage and also agricultural activities. Thus, the salinity level increased, and much of the land became unusable. The electrokinetic remediation method was employed to reduce the salinity level in the soil samples in laboratory conditions. The sample used in remediation is silty agricultural soil, with pH value and electrical conductivity (EC) of which are 8.33 and 1282 mu S/cm respectively. In the lab-scale experiments, three different types of electrodes, aluminum, copper, and galvanized steel, were used in the tests. For each type of metal, electrode pairs were placed in the soil that was filled in a plastic container. Current variation was monitored while 1 VDC/cm was applied to electrodes. Average electrical conductivity reduces to 13.5%. As a side effect, all electrodes suffered from heavy corrosion which may be prevented by using anti-corrosion additives to reduce damage for future applications.
Beyşehir Göl Havzası Çevresindeki Çökellerin Kuvaterner Stratigrafisi, Gastropoda Faunası ile Paleoiklimi ve Paleoekolojisi
(Tmmob Jeoloji Mühendisleri Odası, 2025) Demir, Ahmet; Kapan, Sevinç
Bu çalışmada, Beyşehir Göl havzası çevresindeki çökellerin gastropoda faunası ile, paleoekolojik ve paleoiklim özelliklerinin ortaya çıkarılması amaçlanmıştır. Eski Beyşehir Gölü’nün tortullarından alınan örneklerin incelenmesi sonucunda Mollusk dalının Gastropoda sınıfına ait; 13 cins, 15 tür tanımlanmıştır. Fauna sayısal bolluk açısından değerlendirildiğinde tipik hakim türlerin akarsularda yaşayan Valvata pulchella ve sığ tatlı sularda yaşayan Bithynia leachii olduğu tespit edilmiştir. Bithynia leachii ve Valvata pulchella türünün birlikte bulunduğu seviyelerin çökeldiği zaman aralığında gölün akarsularla beslenen bir tatlı su ortamını yansıttığı düşünülmektedir. Valvata pulchella ve Bithynia leachii türlerinin azaldığı, Planorbis planorbis, Anisus vortex, Gyraulus parvus gibi bataklık ve durgun su ortamlarında yaşayan türlerin sayısal olarak arttığı seviyelerin çökeldiği zaman aralığında ise ortam koşulları ılıman, çok sığ, kapalı göl şartlarını işaret etmektedir. Eski Beyşehir gölünün endemik türü olan, akarsularla beslenen tatlı su ortamını yansıtan Valvata beysehirensis havzanın bir çok seviyesinde gözlenmiştir. Literatürde geç Pleyistosen yaşı verilen V. beysehirensis türünün Pleyistosen süresince varlığı bu çalışma ile ortaya çıkarılmıştır. ESR tarihlendirme sonuçları, diğer araştırmacıların belirlediği yaşlar ve tanımlanan faunanın paleoekolojik özellikleri birlikte değerlendirildiğinde, Pleyistosen boyunca inceleme alanında 7 kurak ve 6 yağışlı iklimsel dönemin etkili olduğu anlaşılmıştır. İnceleme alanındaki iklimsel şartların son 659 bin yıllık dönemde, küresel deniz seviyesi değişimlerini ifade eden MIS 16 -MIS 2 evreleri arasındaki paleoiklimsel değişimlerle uyumlu olduğu görülmüştür.
Integrated Analysis of Mineralogical and Textural Factors on Stress-Induced Fractal Rock Damage: A Multiscale Analysis
(Institute of Physics, 2025) Dinç Göğüş, Ö.; Avşar, E.; Develi, K.; Çalık, Ayten
This study explores the influence of textural properties and mineralogical composition on micro and mesoscale mechanical behaviors of three different rock types. Employing laboratory experiments, discrete element modeling (DEM), mineralogical examinations, and fractal analysis, we quantitatively assess rock damage evolution. Fractal dimension (DB) calculations on crack patterns, identified on thin sections prepared parallel and perpendicular to the uniaxial compressive loading direction at critical stress thresholds (σci, σcd, σpeak), provide insights. Our findings indicate that post-critical stress (σcd) highlights textural properties as primary factors determining rock damage extent, with mesoscale fractures aligning in response to mineralogical composition. © Published under licence by IOP Publishing Ltd.
Electrokinetic Remediation of Metal-Contaminated Soils: Influence of Operating Variables
(American Society of Civil Engineers (ASCE), 2025) Taneja, Sonam; Karaca, Öznur; Haritash, A.K.
Soil pollution is a global concern due to its direct influence on agriculture and food security which needs immediate attention. Electrokinetic Remediation (EKR) is one of the emerging technologies for contaminant removal from soil with the application of direct current electricity. This study investigated the effect of operating variables of EKR, including voltage, electrolyte solution, and electrode material on artificially contaminated soils with Hexavalent Chromium [Cr (VI)] and Lead [Pb (II)]. Results of the study indicated that applied voltage had a profound effect on the removal efficiency of EKR with a maximum removal of 55% and 64% for Cr (VI) and Pb, respectively, at 2.5 V/cm. However, with ethylenediaminetetraacetic acid (EDTA), the removal rate for Cr (VI) (77%) was higher as compared to Pb (65%). Similarly, the behavior of electrode material exhibited contrasting results, with graphite more suited for Cr (VI), while stainless steel for Pb removal. The findings suggested that the operating conditions vary with the type of metal contaminant present. © ASCE.
Late Quaternary paleoclimatic and paleoenvironmental changes in the Konya Closed Basin (Konya, Turkey) recorded by geochemical proxies from lacustrine sediments
(Springer Science and Business Media Deutschland GmbH, 2021) Orhan, Hükmü; Delikan, Arif; Demir, Ahmet; Kapan, Sevinç; Olgun, Kemal
The Konya Closed Basin is an important basin in central Turkey, in terms of its geographic position, Quaternary infills, and well-preserved archeological sites. It comprises Quaternary lake marls and other, mainly fine grained, sediments with locally in excess of 400 m. Geochemical data for samples taken from the 7-m-deep Adakale trench from the late Quaternary lacustrine sediments in the Konya Closed Basin are presented and have been used as proxies to elucidate the past climatic changes, weathering regime, redox conditions, and productivity. Climate changes observed in the studied samples for last 50,000 years were represented by oscillations in weathering processes, detrital input, redox conditions, water levels, and paleoproductivity. Geochemical data show that three periods of high detrital input (high Si+Al+K+Ti+Fe, high Ti/Al, Rb/Sr, low Ca and low Si/Ti), four periods of anoxic conditions (low Mn and Th/U and high Ni/Co, Mo/Al and V/Cr), and four periods of higher productivity (high Cu/Al, Ni/Al, Ca/Al, Ba/Al Si/Ti and Ca/Ti) were effective in the study area. These periods are corresponding to climatic changes during last glacial periods, the warm climate of Dansgaard-Oeschger (D/O) events (D/O 2-12) and the cold climate of Heinrich events (H 2-5).
Unveiling Nature's Resilience: Exploring Vegetation Dynamics during the COVID-19 Era in Jharkhand, India, with the Google Earth Engine
(Mdpi, 2023) Ahmad, Tauseef; Gupta, Saurabh Kumar; Singh, Suraj Kumar; Meraj, Gowhar; Kumar, Pankaj; Kanga, Shruti
The Severe Acute Respiratory Syndrome Coronavirus Disease 2019 (COVID-19) pandemic has presented unprecedented challenges to global health and economic stability. Intriguingly, the necessary lockdown measures, while disruptive to human society, inadvertently led to environmental rejuvenation, particularly noticeable in decreased air pollution and improved vegetation health. This study investigates the lockdown's impact on vegetation health in Jharkhand, India, employing the Google Earth Engine for cloud-based data analysis. MODIS-NDVI data were analyzed using spatio-temporal NDVI analyses and time-series models. These analyses revealed a notable increase in maximum vegetation greenery of 19% from April 2019 to 2020, with subsequent increases of 13% and 3% observed in March and May of the same year, respectively. A longer-term analysis from 2000 to 2020 displayed an overall 16.7% rise in vegetation greenness. While the maximum value remained relatively constant, it demonstrated a slight increment during the dry season. The Landsat data Mann-Kendall trend test reinforced these findings, displaying a significant shift from a negative NDVI trend (1984-2019) to a positive 17.7% trend (1984-2021) in Jharkhand's north-west region. The precipitation (using NASA power and Merra2 data) and NDVI correlation were also studied during the pre- and lockdown periods. Maximum precipitation (350-400 mm) was observed in June, while July typically experienced around 300 mm precipitation, covering nearly 85% of Jharkhand. Interestingly, August 2020 saw up to 550 mm precipitation, primarily in Jharkhand's southern region, compared to 400 mm in the same month in 2019. Peak changes in NDVI value during this period ranged between 0.6-0.76 and 0.76-1, observed throughout the state. Although the decrease in air pollution led to improved vegetation health, these benefits began to diminish post-lockdown. This observation underscores the need for immediate attention and intervention from scientists and researchers. Understanding lockdown-induced environmental changes and their impact on vegetation health can facilitate the development of proactive environmental management strategies, paving the way towards a sustainable and resilient future.
Determining the geochemical characteristics of geothermal resources and generating a geothermal information system of thermal waters in Biga Peninsula, NW Turkey
(Amer Chemical Soc, 2013) Şanlıyüksel Yücel, Deniz; Yücel, Ali Mehmet; Karaca, Zeki; Çetiner, Ziya S.; Erenoğlu, Ramazan Cüneyt; Akçay, Özgün; Kamacı, Celal; Çalışkan, Hidayet
[Abstract Not Available]
CORRECTION AND DENSIFICATION OF UAS-BASED PHOTOGRAMMETRIC THERMAL POINT CLOUD
(Copernicus Gesellschaft Mbh, 2016) Akçay, Özgün; Erenoğlu, Ramazan Cüneyt; Erenoğlu, Oya
Photogrammetric processing algorithms can suffer problems due to either the initial image quality (noise, low radiometric quality, shadows and so on) or to certain surface materials (shiny or textureless objects). This can result in noisy point clouds and/or difficulties in feature extraction. Specifically, dense point clouds which are generated with photogrammetric method using a lightweight thermal camera, are more noisy and sparse than the point clouds of high-resolution digital camera images. In this paper, new method which produces more reliable and dense thermal point cloud using the sparse thermal point cloud and high resolution digital point cloud was considered. Both thermal and digital images were obtained with UAS (Unmanned Aerial System) based lightweight Optris PI 450 and Canon EOS 605D camera images. Thermal and digital point clouds, and orthophotos were produced using photogrammetric methods. Problematic thermal point cloud was transformed to a high density thermal point cloud using image processing methods such as rasterizing, registering, interpolation and filling. The results showed that the obtained thermal point cloud - up to chosen processing parameters - was 87% more densify than the original point cloud. The second improvement was gained at the height accuracy of the thermal point cloud. New densified point cloud has more consistent elevation model while the original thermal point cloud shows serious deviations from the expected surface model.
Electrokinetic remediation: Past experiences and future roadmap for sustainable remediation of metal-contaminated soils
(Elsevier, 2024) Taneja, Sonam; Karaca, Öznur; Haritash, Anil Kumar
Soil pollution due to heavy metals has become a serious environmental concern in the past decade, adversely affecting soil conditions and global food security. Due to this, considerable attention has been given to developing suitable remediation technologies, particularly for heavy metals. Among them, Electrokinetic Remediation (EKR) is a promising developing technique due to its great efficiency for fine-grained soils. The use of an electric field to remove contaminants from soil is effective on a wide range of matrices irrespective of the heterogeneity. In this context, the present study provides a detailed discussion on the design and operational considerations of EKR, mainly, power, electrode, and electrolyte characteristics. The major limitations of EKR, innovative modifications of EKR operations to overcome the limitations, and EKR-integrated technologies have been addressed. The optimization of regulating parameters ensures maximum efficiency towards removal of contaminants at minimum cost of treatment, thus, highlighting the engineering aspect of electrokinetics at field scale. The sustainability concerns arising from EKR and its possible alternative solutions have been discussed, to provide useful information and prospects to researchers in the field.

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