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Öğe An Assessment of The Water Quality of Erdemli? (Mersi? n) Coastal Aquifer(TMMOB Chamber of Geological Engineers, 2023) Karakuş, Fatma Ece; Kurt, Mehmet Ali; Yildirim, Ümit; Güler, Cüneyt; Güven, OnurThe water quality and quantity of coastal aquifers are increasingly adversly affected due to changing climate conditions and increasing anthropogenic activities. This study was conducted to determine the water quality and pollutants of the Erdemli Coastal Aquifer (ECA). In this study, groundwater sampling was carried out in August 2020 to determine the physical and chemical properties of the water. The obtained results were evaluated according to the World Health Organization (WHO) drinking water standards. It was found that the electrical conductivity values were quite high in samples taken from certain points near the Mediterranean coast of ECA. These samples also exhibited high sodium (Na+) and chloride (Cl?) concentrations, exceeding the recommended WHO limits. Another significant problem in the ECA is nitrate (NO3?) pollution. The nitrate concentrations in the August 2020 samples ranged from 2.17 to 131.51 mg/L, with 15 samples exceeding the limit value (50 mg/L). Some samples also exceeded the WHO-established limit values for trace element concentrations (Al, Fe and Ni). When assessing the groundwater in the study area for agricultural irrigation water quality, it was determined that waters in areas with active seawater intrusion were not suitable for irrigation purposes. The study area and its vicinity have been witnessing the opening of new agricultural areas on a daily basis. This situation further exacerbates the pressure on the declining water resources in the ECA. As a result, the implementation of sustainable integrated water management in ECA is urgently needed. © 2023, TMMOB Chamber of Geological Engineers. All rights reserved.Öğe An Investigation into the Causes of Salinization in the Tarsus Coastal Aquifer (Mersin)(TMMOB Chamber of Geological Engineers, 2022) Güven, Onur; Güler, Cüneyt; Kurt, Mehmet Ali; Yildirim, ÜmitThis study investigated the causes of the salinization occurring in the Tarsus Coastal Aquifer (Mersin) located in the Eastern Mediterranean region of Turkey. Groundwater salinization, which is a critical problem, especially in the Mediterranean basin, occurs as a result of processes and mechanisms such as seawater intrusion, climate change, geogenic effects and anthropogenic activities (pollution and hydrological interventions). In this context, samples were collected from 87 groundwater wells and seawater (Mediterranean) during a field study conducted in September 2020. The temperature, electrical conductivity, pH, salinity, reduction-oxidation (redox) potential, dissolved oxygen, and total dissolved solid values of collected water samples were measured in the field. The major ion and trace element contents (Ca+2, Mg+2, Na+, K+, HCO-3, CO-23, Cl-, SO-24, NO-3, NO-2, B, Br, Sr ve Li) of the water samples were analyzed in a laboratory by spectrometric (ICP-MS), spectrophotometric, and volumetric (titration) methods. Thematic distribution maps of the analyzed parameters were created using a Geographic Information System (GIS) software. The hydrochemical facies of the water samples were determined using Piper and HFE diagrams. In order to explain the salinization mechanisms occurring in the region, binary (x-y) graphs were created using the ratios of various major ions and/or trace elements. According to the results obtained, it was revealed that the salinization phenomenon affecting the Tarsus Coastal Aquifer occurred as a result of seawater intrusion, the dissolution of Messinian evaporites (anhydrite, gypsum and halite) and anthropogenic (agricultural and industrial) activities. © 2022, TMMOB Chamber of Geological Engineers. All rights reserved.Öğe Modelling of the discharge response to climate change under RCP8.5 scenario in the Alata river basin (Mersin, SE Turkey)(MDPI AG, 2021) Yıldırım, Ümit; Güler, Cüneyt; Önol, Barış; Rode, Michael; Jomaa, SeifeddineThis study investigates the impacts of climate change on the hydrological response of a Mediterranean mesoscale catchment using a hydrological model. The effect of climate change on the discharge of the Alata River Basin in Mersin province (Turkey) was assessed under the worstcase climate change scenario (i.e., RCP8.5), using the semi-distributed, process-based hydrological model Hydrological Predictions for the Environment (HYPE). First, the model was evaluated temporally and spatially and has been shown to reproduce the measured discharge consistently. Second, the discharge was predicted under climate projections in three distinct future periods (i.e., 2021–2040, 2046–2065 and 2081–2100, reflecting the beginning, middle and end of the century, respectively). Climate change projections showed that the annual mean temperature in the Alata River Basin rises for the beginning, middle and end of the century, with about 1.35, 2.13 and 4.11 °C, respectively. Besides, the highest discharge timing seems to occur one month earlier (February instead of March) compared to the baseline period (2000–2011) in the beginning and middle of the century. The results show a decrease in precipitation and an increase in temperature in all future projections, resulting in more snowmelt and higher discharge generation in the beginning and middle of the century scenarios. However, at the end of the century, the discharge significantly decreased due to increased evapotranspiration and reduced snow depth in the upstream area. The findings of this study can help develop efficient climate change adaptation options in the Levant’s coastal areas. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.Öğe Sivas havzasındaki Eosen volkanizmasından kaynaklanan arsenik kirliliği:Yalıncak köyü (Hafik, Sivas) eski içme suyu kaynağı(2021) Biçgel, Birsen F.; Kurt, Mehmet A.; Yıldırm, Ümit; Güler, Cüneyt; Güven, OnurBu çalışmanın amacı, Yalıncak köyü (Hafik, Sivas) eskiiçme suyu kaynağındaki yüksek arsenik (As) derişiminin(1512 ?g/L) kökeninin araştırılmasıdır. Bu amaçla, içmesuyu kaynağının beslenim alanında yüzeyleyenkayaçlardan 48 adet örnek alınmıştır. Kayaç örneklerininana oksit içerikleri XRF yöntemiyle, mineralojikbileşimleri polarizan mikroskop ve XRD yöntemleriyle,minerallerin As derişimleri ise SEM-EDS yöntemikullanılarak belirlenmiştir. Yapılan analizler sonucunda,sulardaki arseniğin kaynağının, piroksen ve plajiyoklazmineralleri ile birlikte değişik köken ve boyuta sahipvolkanik cam parçaları içeren tüfit birimi olduğu tespitedilmiştir. Kayaç örneklerindeki arsenik oksit (As2O3)derişimleri %0.01 ve %0.14 arasında değişmekte olup bazıminerallerde %14’e varan As mevcuttur. Çalışmasonucunda, bölgedeki yüzey ve yeraltı sularındaki arsenikkirliliğinin Sivas Havzası’ndaki Eosen yaşlı Bozbelformasyonu içindeki tüfitlerde bulunan FeAsS (arsenopirit)ve BAsO4 (borarsenat) minerallerinin çözünmesinden (su- kaya reaksiyonu yoluyla) kaynaklandığı belirlenmiştir.
