TR Dizin İndeksli Yayınlar / TR Dizin Indexed Publications Collection
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Article Citation - WoS: 10Effects of Seismic Activity on Groundwater Level and Geothermal Systems in İzmir, Western Anatolia, Turkey: the Case Study From October 30, 2020 Samos Earthquake(Tubitak Scientific & Technological Research Council Turkey, 2021) Uzelli, Taygun; Bilgic, Esra; Ozturk, Bahadir; Baba, Alper; Sozbilir, Hasan; Tatar, OrhanThe October 30, 2020 Samos earthquake (Mw 6.6) affected the Aegean Sea and environs, caused destruction and loss of life in the city of & Idot;zmir located 70 km away from the earthquake epicenter. Before this earthquake, water resources were monitored in the areas of Bayrakl & imath;, G & uuml;lbah sigma e, and Seferihisar. For this purpose, 10 groundwater monitoring wells were drilled in the Bayrakl & imath; area, where groundwater level, temperature, and electrical conductivity changes were monitored at 1-h intervals in 5 wells. Besides physical parameters such as groundwater levels, temperatures and electrical conductivities, hydrogeochemical cations, and anions measured in the study area. Change in the groundwater levels was observed before, during, and after the Samos earthquake. A trend of rising groundwater level was observed two days before the mainshock, to a height of 10 cm, and the level was maintained till the end of the earthquake. The water levels returned to its original height after about 7 to 10 days of the earthquake. Moreover, electrical conductivity (EC) values were changed because of the interaction with the surrounding rocks and well walls, mixing with different waters during the earthquake shaking. The essential anomalies were observed in the geothermal fields of G & uuml;lbah sigma e and Seferihisar. Due to this earthquake, new geothermal springs emerged along the NE-SW trending G & uuml;lbah sigma e and Tuzla faults, located about 50 to 20 km from the Samos earthquake epicenter, respectively. The new geothermal waters are in Na-Cl composition and similar to other geothermal springs in the region. While the recorded water temperatures in the new geothermal springs vary from 40 to 45 degrees C in Seferihisar, it was measured between 35 and 40 degrees C in G & uuml;lbah sigma e. Due to these anomalies, it is found essential to monitor the effect of the earthquake on the physical and chemical characteristics of the groundwater and its usefulness in earthquake predictions.Article 6 Şubat Kahramanmaraş Depremleri ile Oluşan Kütle Hareketlerine Bir Örnek: Tepehan Heyelanı(2023) Dölek, İskender; Uzelli, Taygun; Ege, İsmail; Çelik, Ömer6 Şubat 2023 tarihinde, Doğu Anadolu Fay Zonu (DAFZ) üzerinde yaklaşık 9 saat ara ile meydana gelen depremler sonucunda can ve mal kayıpları yaşanmış, yollar, köprüler zarar görmüş farklı türde (heyelan, kaya düşmesi, çamur akması) binlerce kütle hareketi meydana gelmiştir. Hatay’ın Altınözü ilçesine bağlı Tepehan köyünde Neojen yaşlı kumtaşı, killi kireçtaşı, kiltaşı ve marnlardan oluşan birim içerisinde gelişen heyelan 12.000 metrekarelik bir alanı etkilerken, 180.000 metreküpten fazla bir malzeme deprem sırasında oluşan heyelanla yer değiştirmiştir. Bu kadar büyük bir kütlenin yer değiştirmesinde depremlerin büyüklüğü yanında insan faaliyetleri de etkili olmuştur. Heyelanın meydana geldiği sahada Drone ile enine ve boyuna %70 bindirmeli sütunlar oluşturacak şekilde dijital görüntüler çekilmiştir. Bu görüntüler Agisoft yazılımında işlenmiş 60cm * 60cm piksel çözünürlükte Dijital Yüzey Modeli (DSM) ve Orto fotolar üretilmiştir. Heyelanın farklı yerlerinden alınan toprak numuneleri analiz edilerek genel toprak özellikleri belirlenmeye çalışılmıştır. Tepehan heyelanı depremlerin kütle hareketlerini (heyelanları) tetiklediği gerçeğinin somut bir örneği olması dışında yerleşim alanlarının doğal tehlikelere karşı (kütle hareketleri) güvenli hale getirilmesinde heyelanların izlenmesi ve haritalanmasının önemini bir kez daha göstermiştir. Depremlerin etkileri değerlendirilirken kütle hareketleri de dikkate alınmalıdır. Bu şekilde daha gerçekçi bir değerlendirme yapılabilir ve koruyucu önlemler daha etkili bir şekilde alınabilir.Article Araklı ve çevresinde (Trabzon) sel ve taşkına neden olan derelerin morfometrik analizlerle taşkın duyarlılıklarının belirlenmesi(Giresun Üniversitesi, 2023) Avci, Vedat; Dölek, İskender; Uzelli, TaygunBu çalışmada, Trabzon iline bağlı Araklı ilçesi ve çevresinde sel ve taşkına yol açan derelerin morfometrik özellikleriyle taşkın duyarlılıklarının belirlenmesi amaçlanmıştır. 18 Haziran 2019 tarihinde Araklı ilçesi Çamlıktepe Mahallesi’nde meydana gelen taşkında 9 kişi hayatını kaybetmiştir. Karadere Çayı Havzası’nda meydana gelen taşkında çok sayıda yapı yıkılmıştır. Çalışmada Karadere Çayı Havzası, komşu Yanbolu Deresi, Küçükdere Çayı, Manahoz Çayı ve Kastel Deresi Havzaları ile morfometrik özellikleri açısından birlikte değerlendirilmiştir. Havzaları kapsayan 10*10 m hücre boyutuna sahip Sayısal Yükselti Modeli (SYM) kullanılarak, havzaların sınırları belirlenmiştir. Belirlenen havzalara Coğrafi Bilgi Sistemleri (CBS) yazılımları kullanılarak drenaj yoğunluğu (Dd), akarsu sıklığı (Fs), havza şekli (Rf), uzama oranı (Re), havza reliefi (Bh), relief oranı (Rh), engebelilik değeri (Rn), akım toplanma zamanı (Tc), hipsometrik integral (Hi) ve eğri (He) indisleri uygulanmıştır. İndis sonuçları kullanılarak derecelendirme yapılmış ve havzaların taşkın duyarlılığı belirlenmiştir. Buna göre; Karadere Çayı ve Kastel Deresi Havzalarında taşkın duyarlılığı yüksek, Manahoz Deresi Havzası’nda orta, Yanbolu Deresi ve Küçükdere Çayı Havzası’nda düşük olarak bulunmuştur. Rölyef özellikleri ve iklim-beşeri özellikleri nedeniyle havzalarda afet boyutunda taşkınların yaşanması muhtemeldir. Havza yönetimi çalışmalarında sel ve taşkınlara yol açan doğal (morfometrik ve jeomorfolojik) ve beşeri tüm faktörlerin dikkate alınması yararlı olacaktır.Article Citation - WoS: 6Citation - Scopus: 8The Potential, Utilization and Development of Geothermal Energy in Türkiye(Maden Tetkik ve Arama Genel Mudurlugu-mta, 2023) Sener, Mehmet Furkan; Uzelli, Taygun; Akkus, Ibrahim; Mertoglu, Orhan; Baba, AlperGeothermal energy is a natural resource that can be utilized directly or by converting to other types of energy. Considering the diversity of the geological structure of Turkiye, the geothermal systems have developed depending on young tectonic and volcanic active rock. Western and Central Anatolia are especially rich in geothermal resources. The geothermal well with the hottest well-bottom temperature was drilled in Central Anatolia, and the well-bottom temperature was measured as 341 degrees C at a depth of 3845 meters. In 2022, Turkiye's electricity generation capacity and the total installed direct heat use reached 1663 MWe and 5113 MWt, respectively. Considering Anatolia's Curie depth and heat flux, the probable thickness of the batholith can be regarded as 10 km. For example, the total granitoid area of Western Anatolia is 4221 km2 and at least 2% of this granitoid can provide approximately 8x107 MWh of electricity by Enhanced Deep Geothermal Systems (EDGS). When all granites in Turkiye are considered, it is expected that the future capacity of Turkiye will be much higher with drilling research and development studies and the discovery of new fields. This capacity will exceed 100.000 MWt levels in the medium term, especially with the addition of EDGSs.Article Citation - WoS: 8Citation - Scopus: 8Structural Controls and Hydrogeochemical Properties of Geothermal Fields in the Varto(TÜBİTAK Scientific & Technological Research Council Turkey, 2021) Uzelli, Taygun; Sener, Mehmet Furkan; Dolek, Iskender; Baba, Alper; Sozbilir, Hasan; Dirik, Ramazan KadirVarto and the surrounding region have important geothermal fields, developing in strike-slip tectonic setting in East Anatolia, which resulted from the collision of the Arabian and Eurasian plates. The main structural elements in the area are the NE-trending sinistral and NW-trending dextral strike-slip fault segments and N-S trending extension zones. In order to determine fault-controlled geothermal circulation, it is very important to fully characterize the structural elements in these complex environments. The widely distributed volcanic rocks have fracture and crack systems that play an important role in surface infiltration, geothermal fluid, and groundwater circulation. Especially in areas where the fault segments intersect, hot springs outlets and natural resources easily come to the surface. In order to understand the flow paths of geothermal fluid along the faults in these geothermal systems, it is necessary to determine the stress state of the faults and to map the distribution of the structural elements. For this reason, we conducted a detailed study on the Varto Fault Zone, which has important geothermal fields in Eastern Anatolia. We present conceptual models of the geothermal fields in the Varto region that show favorable geothermal activity on the intersecting fault segments, fault bends, step-overs, and accompanying fracture-crack sets. As a result, we emphasize that the planes of strike-slip faults in transtensional areas are more favorable for secondary permeability and enhances the geothermal fluid circulation, and this can be supported by hydrogeochemical data.Article Citation - WoS: 4Citation - Scopus: 15Effects of Seismic Activity on Groundwater Level and Geothermal Systems in İzmir, Western Anatolia, Turkey: the Case Study From October 30, 2020 Samos Earthquake(TÜBİTAK - Türkiye Bilimsel ve Teknolojik Araştırma Kurumu, 2021) Uzelli, Taygun; Bilgiç, Esra; Öztürk, Bahadır; Baba, Alper; Sözbilir, Hasan; Tatar, OrhanThe October 30, 2020 Samos earthquake (Mw 6.6) affected the Aegean Sea and environs, caused destruction and loss of life in the city of İzmir located 70 km away from the earthquake epicenter. Before this earthquake, water resources were monitored in the areas of Bayraklı, Gülbahçe, and Seferihisar. For this purpose, 10 groundwater monitoring wells were drilled in the Bayraklı area, where groundwater level, temperature, and electrical conductivity changes were monitored at 1-h intervals in 5 wells. Besides physical parameters such as groundwater levels, temperatures and electrical conductivities, hydrogeochemical cations, and anions measured in the study area. Change in the groundwater levels was observed before, during, and after the Samos earthquake. A trend of rising groundwater level was observed two days before the mainshock, to a height of 10 cm, and the level was maintained till the end of the earthquake. The water levels returned to its original height after about 7 to 10 days of the earthquake. Moreover, electrical conductivity (EC) values were changed because of the interaction with the surrounding rocks and well walls, mixing with different waters during the earthquake shaking. The essential anomalies were observed in the geothermal fields of Gülbahçe and Seferihisar. Due to this earthquake, new geothermal springs emerged along the NE-SW trending Gülbahçe and Tuzla faults, located about 50 to 20 km from the Samos earthquake epicenter, respectively. The new geothermal waters are in Na-Cl composition and similar to other geothermal springs in the region. While the recorded water temperatures in the new geothermal springs vary from 40 to 45 °C in Seferihisar, it was measured between 35 and 40 °C in Gülbahçe. Due to these anomalies, it is found essential to monitor the effect of the earthquake on the physical and chemical characteristics of the groundwater and its usefulness in earthquake predictions.