Yazar "Bozdag, Ayla" seçeneğine göre listele
Listeleniyor 1 - 9 / 9
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe AHP and GIS based land suitability analysis for Cihanbeyli (Turkey) County(SPRINGER, 2016) Bozdag, Ayla; Yavuz, Fadim; Gunay, Ash SuhaThis paper offers an integrated approach to contribute to the process of agricultural land suitability analysis using the Analytic Hierarchy Process (AHP) and Geographic Information System (GIS) methods. The paper addresses Cihanbeyli, the largest county in Turkey in terms of area, and focuses on determining sustainable strategies to activate/improve agriculture as a main source of income, thereby improving the economy of the region. The combined AHP and GIS methodology which consists of stages such as structuring AHP hierarchy, describing evaluation criteria, doing pairwise comparisons, and preparing criterion maps and land suitability maps has been applied to identify the areas suitable for irrigated and dry farm agriculture. A comparison of the final land suitability map with current land use has revealed that an area of 294.73 km(2) (7.18 %) is suitable for irrigation and an area of 2323.45 km(2) (56.77 %) is suitable for dry farm agriculture. Additionally, the analysis clearly shows the necessity of a decrease in irrigated agricultural land and an increase in dry farm agricultural land. The applied AHP and GIS based agricultural land suitability analysis is useful in (1) referring agricultural activities to the areas that have good physical and environmental conditions for agriculture, thus achieving maximum agricultural efficiency in countryside, (2) improving non-agricultural uses in the areas that are unsuitable for agriculture and have low efficiency, (3) avoiding the construction and environmental pressures on suitable farmland, so conducing to better land-use planning decisions.Öğe Assessment of the hydrogeochemical characteristics of groundwater in two aquifer systems in Cumra Plain, Central Anatolia(SPRINGER, 2016) Bozdag, AylaLocated in a semi-arid climate, Cumra (Konya) plain is one of the most important agricultural regions in Turkey. Groundwater is the major source for agricultural, domestic, and other water-related activities due to the insufficiency of surface water. As groundwater is the only major source of water in this area, it is important to know the effects of geological formations and anthropogenic activities on groundwater chemistry. This study was carried out with the objective of identifying the hydrogeochemical characteristics and processes controlling the groundwater chemistry in Cumra Plain, Central Anatolia, Turkey. The study area is comprised of two main aquifers which are the semi-confined aquifer of the Neogene age and the unconfined aquifer of the Quaternary age. To identify the hydrogeochemical characteristics of groundwater in two aquifer systems and to understand the major factors and mechanisms controlling the groundwater chemistry, graphical plots, mineral saturations, and multivariate statistical analysis of chemical constituents in the groundwater were used. Study results show that groundwater is generally neutral to slightly alkaline in nature with a pH ranging from 6.67 to 8.10, and the dominance of ions is in the order of Ca2+ > Mg2+ > Na+ > K+ for the Neogene aquifer and HCO3- > SO42- > Cl- > NO3-; Mg2+ > Ca2+ > Na+ > K+ and SO42- > HCO3- > Cl- > NO3- for the Quaternary aquifer. While the chemical composition of groundwater in the Neogene aquifer is mainly controlled by water-rock interaction including dissolution of carbonates and gypsum, calcite precipitation, and dedolomitization, the main geochemical processes in the Quaternary aquifer are reverse ion exchange, evaporation, dissolution of carbonates, gypsum and soil salts, calcite precipitation, and silicate weathering. The mechanism controlling groundwater chemistry in the Neogene aquifer is actually regulated by the geogenic processes (water-rock interaction) rather than by anthropogenic activities. However, the mechanism controlling groundwater chemistry in the Quaternary aquifer is regulated by both geogenic processes and anthropogenic activities. In addition, anthropogenic nitrogen pollution in the study area is currently not serious, but evaporation and leaching of soil salts due to anthropogenic activities increase the concentrations of ions in the Quaternary aquifer.Öğe Evaluation of groundwater quality in the Cihanbeyli basin, Konya, Central Anatolia, Turkey(SPRINGER, 2013) Bozdag, Ayla; Gocmez, GulerThe Cihanbeyli basin is located in the northern part of Konya in the Central Anatolian region, Turkey and is characterized by semi-arid climatic conditions and scarcity in water resources. The suitability of groundwater quality for drinking and agricultural purposes in the Cihanbeyli basin was assessed by measuring physicochemical parameters, including major cation and anion compositions, pH, total dissolved solid, electrical conductivity, and total hardness. For this purpose, 54 samples were collected from different sources viz. deep wells, shallow wells, and springs. Results from hydrochemical analyses reveal that groundwater is mostly affected by salty and gypsiferous lithologies. Evaporite minerals such as gypsum, anhydrite, and chloride salts make high contributions from the recharge areas (west, northwest, and southwest parts) toward the discharge area (central and eastern parts). High values of total dissolved solids in groundwater are associated with high concentrations of all major ions. A comparison of groundwater quality in relation to drinking water standards showed that most of the water samples are not suitable for drinking. Based on sodium absorption ratio values and percent sodium, salinity appears to be responsible for the poor groundwater quality, rendering most of the samples unsuitable for irrigation usage. It is concluded that evaporation and mineral dissolution are the main processes that determine major ion compositions.Öğe HYDROCHEMICAL AND ISOTOPIC CHARACTERISTICS OF WETLANDS IN THE CIHANBEYLI (KONYA) BASIN, CENTRAL ANATOLIA, TURKEY(INT SCIENTIFIC CONFERENCE SGEM, 2011) Bozdag, Ayla; Gocmez, GulerCihanbeyli basin is located in the northern part of Konya in the Central Anatolia, Turkey. This wetland is characterized with four lakes (Salt Lake, Bolluk Lake, Tersakan Lake and Gok Lake). The Salt Lake, Tersakan Lake and Bolluk Lake are so important because of its contribution to country economy and enabling ecosystem services for endangered bird species. In recent years, The Salt, Tersakan and Bolluk Lakes are in danger of completely drying. The main reasons of drying of the lakes are global warming, the lack of precipitation, shallowness of the lakes, excessive evaporation and inadequate recharge sources. The Salt Lake, Tersakan Lake and Bolluk Lake have Na-Cl water type and EC values can be reached 592.670 mu S/cm in rainy season. Research findings point out a thundering rise at SO4 concentration in addition to Cl ion in the Bolluk and Tersakan Lakes. The Gok Lake has Na-HCO3 water type in rainy season, while it has Na-Cl water type in dry season. EC values of the Go Lake range from 1058 to 1573 mu S/cm in both seasons. All of the lakes are alkaline type with 8.15 and 9.46 pH values. Al, As, P and B values in the Salt Lake; As, Se, P and B values in the Tersakan Lake; Se, P, Pb and B values in the Bolluk Lake; As and B values in the Gok Lake are clearly exceed the aqualitic life standards. The reasons of high values of this ions in the lakes are probably due to discharging of sewage, domestic and medical wastes without purification from Konya, Cihanbeyli and the surrounding settlements to the Salt Lake, Bolluk Lake and Tersakan Lake. The delta O-18 and delta H-2 values of the lakes are range between -6.14 parts per thousand and 1.44 parts per thousand, -48.59 parts per thousand and -7.53 parts per thousand, respectively. All of the waters have meteoric origin. The samples collected from all of the lake waters show an evaporation effect. In comparison to the other lake waters, isotopic value of the Gok Lake water is poor than the other lake waters. This position shows a mixing of regional groundwater and the lake water.Öğe Hydrogeochemical and isotopic characteristics of Kayak (Seydisehir-Konya) geothermal field, Turkey(PERGAMON-ELSEVIER SCIENCE LTD, 2016) Bozdag, AylaThe Kayak geothermal field is located 13 km north of Seydisehir town, about 90 km southwest of Konya Province in the Central Anatolia, Turkey. This study was carried out to determine the origin, chemical characteristics, and isotopic composition of Kayak thermal waters. The measured temperatures of thermal and mineral waters range from 21.5 to 26 degrees C with a discharge of 0.8 l/s in springs, and from 30 to 45.8 degrees C with a discharge of 185 l/s in wells. Thermal and/or mineralized spring and well waters are of Ca-Na-HCO3 types with electrical conductivity ranging from 2530 to 4150 mu S/cm while cold groundwater is mainly of Ca-HCO3 and Ca-Mg-HCO3 types with electrical conductivity ranging from 446 to 668 mu S/cm. Kayak thermal waters have not reached complete chemical re-equilibrium possibly as a result of mixing with cold water during upward flow. Assessments from quartz geothermometers and fluid mineral equilibria calculations suggest that reservoir temperature of Kayak geothermal field ranges from 68 to 105 degrees C. Thermal waters are oversaturated at discharge temperatures for calcite, dolomite, and aragonite minerals corresponding to travertine precipitation in the discharge area. Gypsum and anhydrite minerals are undersaturated in all the thermal waters. The delta O-18 and delta H-2 compositions of Kayak thermal and cold waters point to a meteoric origin. Meteoric waters infiltrate the reservoir rocks along faults and fracture zones. After being heated at depth with the high geothermal gradient, they move up to the surface along faults and fractures that act as pathways. Additionally, delta O-18 and delta H-2 values suggest that thermal waters are recharged from higher elevations in comparison with cold waters. Long-term circulation of meteoric waters within the basement rocks is indicated by low tritium (<2 TU) values in the thermal waters, although the fluids do not achieve thermodynamic equilibrium. Based on the delta C-13 values, carbon in thermal waters is considered as originating from a mixture of marine carbonates and CO2 gas of volcanic (mantle) origin. (C) 2016 Elsevier Ltd. All rights reserved.Öğe Hydrogeochemical and Isotopic Study of Groundwater in a Semi-arid Region: Yeniceoba Plain (Cihanbeyli-KONYA), Central Anatolia,Turkey(WILEY, 2016) Bozdag, Ayla; Gocmez, GiilerGroundwater is the most important source of water supply in the Yeniceoba Plain in Central Anatolia, Turkey. An understanding of the geochemical evolution of groundwater is important for the sustainable development of water resources in this region. A hydrogeochemical investigation was conducted in the Plio-Quaternary aquifer system using stable isotopes (delta O-18 and delta D), tritium (H-3), major and minor elements (Ca, Na, K, Mg, Cl, SO4, NO3, HCO3 and Br) in order to identify groundwater chemistry patterns and the processes affecting groundwater mineralization in this system. The chemical data reveal that the chemical composition of groundwater in this aquifer system is mainly controlled by rock/water interactions including dissolution of evaporitic minerals, weathering of silicates, precipitation/dissolution of carbonates, ion exchange, and evaporation. Based on the values of Cl/Br ratio (> 300 mg/l) in the Plio-Quaternary groundwater, dissolution of evaporitic minerals in aquifer contributes significantly to the high mineralization. The stable isotope analyses indicate that the groundwater in the system was influenced by evaporation of rainfall during infiltration. Low tritium values (generally <1 tritium units) of groundwater reflect a minor contribution of recent recharge and groundwater residence times of more than three or four decades.Öğe PRELIMINARY MINERALOGICAL AND CHEMICAL PROPERTIES OF HALITE IN THE SOUTH OF TUZGOLU BASIN (TURKEY)(GEOBALCANICA SOC, 2017) Ercan, Hatice; Karakaya, Muazzez Celik; Karakaya, Necati; Bozdag, Ayla; Delikan, ArifThe study area is located in the southern parts of Tuzgolu basin namely closed Konya basin, which is one of the largest inner/closed basin of Neogene age in the Central Anatolia (Turkey). The basin was mostly filled with the Late Cretaceous-Quaternary aged different types of minerals. The basin, in deep, starts red colored clastic sediments which are formed from thick red clastic unit was deposited in shallow-deep-shallow marine environments. This study was primarily focused on the textural properties of halite mineral in the Miocene units. The textural properties of the halite mineral have been investigated mainly for detection of environmental conditions and origin of halites as primary and secondary halites. Remnant of chevrons structures are most common primary texture preserved in ancient halite deposits. Upward-growing chevrons determined in the halite minerals show that these textures contain rich fluid inclusions and have cloudy or milky appearance. Halite minerals are interlayered with carbonate, sulfate and clay minerals in the studied core samples. The halite layers are generally observed in thick of mm-dm, salt deposits in the dm-m in size precipitated when condition are suitable that huge thickness of shoal water evaporite can accumulate in very short time frames. The thin laminates of halite indicate the fluid chemistry causing the precipitation and changed in a short time interval of the environment condition. The presence of hoper-textures in halite minerals indicated that the first precipitated on the shallow hyper saline brine pools and when they were undisturbed by wind and waves. The secondary marks were commonly observed in the drillings as the nodular structure anhydrite and mosaic texture of halite. The ratios of Cl/Br and Na/Br in the studied halite samples have very high values that are in relation to dissolution and mixing.Öğe SEDIMENTARY CHARACTERISTICS OF THE DIKMENDEDE FORMATION (ANKARA, TURKEY)(INT SCIENTIFIC CONFERENCE SGEM, 2011) Ozkan, Ali Mujdat; Bozdag, AylaThe Maastrichtian aged Dikmendede Formation in the Orhaniye (Kazan-Ankara) area formed in a deep-marine environment. The formation consists of alternating green, grey-coloured turbiditic conglomerate, sandstone, shale, claystone and marl. The unit has typical flysch features and has sedimentary structures such as thin/thick bedding, normal graded bedding, erosional surfaces, flute casts, load structures, ball-and-pillow structures, bounce marks, slump structures and numerous biogenic traces. The conglomerates of turbiditic channel fills display clast imbrication and graded bedding. The sandstones of the Dikmendede Formation are mainly made of quartz, plagioclase, alkali feldspar (orthoclase, microcline, sanidine), sedimentary (carbonate, chert, sandstone, shale), metamorphic (micaschist, quartzschist, calcschist, phyllite, gneiss), volcanic rock clasts, mica (muscovite, biotite), heavy minerals (epidote, opaque minerals, glaucophane, piroksen, rutile, turmaline). The sandstones, texturally and mineralogically immature, are cemented by calcite and iron-oxides, in addition to clayey (illite, smectite, chlorite) and in a lesser amount micritic matrix.Öğe STRUCTURAL PROPERTIES OF THE NEOGENE EVAPORITE DEPOSITS IN THE SOUTH OF TUZGOLU BASIN, TURKEY(GEOBALCANICA SOC, 2017) Delikan, Arif; Bozdag, Ayla; Karakaya, Necati; Ercan, Hatice; Karakaya, Muazzez CelikTuzgolu Basin located at the Central Anatolia is an inner enclosed basin and is bounded by Ankara uplift in the north, the Kirsehir massif from in the east and the Sivrihisar-Bozdag massif from the west. The Salt Lake is bordered by Tuzgolu, Aksehir and Nigde fault zones in NE-GW direction. Typical mechanical and sedimentary structures in the evaporitic sediments are observed in especially gypsum and anhydrite, partially glauberite and halite deposits. The most prominent structures observed in the investigated cores are usually sequential sedimentation or stratification, other primary structures are slump structures, sub-strata traces, mud cracks and flat conglomeratic gravel sediments. Stratification in the evaporites showed changes in the mineralogical and textural properties from the bed to the bed. There are also settlement/load structures, ripple cross lamination and cross stratification were determined. As a result of sedimentation, sedimentation-grade bedding and intercalation of clay or carbonate mud and salted mineral mud have been observed. The lacustrine sediments in the inner zones of the basin consist of Ca-Na-sulphate, Mg-sulphate sediments, claystone, carbonate alternation and partly laminated. Repeating the evaporitic sediments in mm and cm thickness provides a seasonal sedimentation view.
