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    HYDROGEOLOGICAL CHARACTERISTICS OF BEYSEHIR LAKE AND ENVIRONS
    (INT SCIENTIFIC CONFERENCE SGEM, 2008) Bozdag, Ali; Bayram, A. Ferhat; Ince, Ismail
    The most important creeks discharging to the Beysehir Lake (Sarisu, Ustunler, Ebulvefa, Eflatun) and their drainage area form the southeast basin of the lake. In this study will be given briefly the rocks in these basins and their hydrochemical relation with surface and subsurface water The Lower - Middle Cambrian Caltepe formation comprises of dolomite, crystallized limestone and nodular limestone, occurs at the basement and, has reservoir rock characteristics. The Upper Cambrian - Lower Ordovician Seydisehir formation overlies conformably the Caltepe formation and comprises of schist, phillite and shale bearing limestone and quartzite lenses in places. The Anamasdagi formation which is the most important reservoir rock in the study area has widespread outcrops around the lake and rest unconformable on the Seydisehir formation. It is composed of conglomerate, marl, sandstone, ferric bauxite, dolomite, limestone and, is Upper Jurassic - Upper Cretaceous in age. The Hoyran complex comprising of serpantinite, pyroxenite, harzburgite, dunite, diabase and chromites emplaced tectonically over the abovementioned units. This unit has outcrops starting from northern part of the Beysehir lake extending approximately in the NNW- SSE direction up to the Yesildag town located at the south of the lake. Besides, the Eocene Buyukkopru formation comes unconformable on these units and, begins at the bottom, with the red marl and continues with mudstone - claystone - turbiditic sandstone. The Toprakli formation is made up of partially consolidated pebble, sand and clay and, covers all the abovementioned units. Karstification and their size in the limestone which are widespread in the basin and which are mostly forming the reservoir rock were interpreted by means of their chemical analysis results. The permeability of alluvial sediments was determined with sieve analysis. The variations in the water level of the lake were interpreted statistically. The chemical analysis results of surface and spring water were evaluated in different diagrams and the possibly of these water as being drinkable and usable were searched.
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    NUMERICAL ANALYSIS OF WATER WELL DRILLING SECTOR OF TURKEY
    (INT SCIENTIFIC CONFERENCE SGEM, 2008) Bayram, A. Ferhat; Ozdemir, Adil; Ucgun, Fatih; Kansun, Gursel
    Performing a numerical analysis of water well drilling sector of Turkey was aimed in this study. Within this purpose, number of the machinery in equipment pool of the institutions and companies which are involved in the water well drilling, yearly drilling quantities, drilling equipment preferences and geological data of 2640 water well drilling boreholes opened in 73 provinces between the years of 1998 - 2006 and the results below have been reached: The Municipalities in Turkey meet 95% of their drinking water needs (70% of the population of Turkey namely 49 million people) from groundwater as 60% from wells, 35% from spring water and 5% (30% of the population of Turkey namely 21 million people) by purifying fro surface water. 98% of the villages meet their drinking water needs from groundwater. Such need is being met as 85% from spring water, 13% of from wells, 2% from rivers, dams, lakes and lagoons. Yearly water well drilling need in Turkey is around 18,100 wells and 1,705,000 m. Water well drilling borcholes are opened in Turkey as 50% at old or new river bed alluvial deposits, 20% at limestone, 15% at volcanic rocks such as basalt, andesite, tuff, agglomerate, 10% at river basins where sandy, gravelly and clayey levels of lake beds are, 5% at rocks such as granite, diabase, serpentine. Water well drillings in Turkey approximately are at the depth of <50 m as 14.4%, 50 100 m as 36.6%, 101 - 149 m as 14.6%, 150 - 199 m as 22.3% 200 - 249 m as 7.1%, 250 - 299 m as 2.3%, 300 - 349 in as 1.2%, > 350 m as 1.5 It is observed that rotary drilling which is one of the water well drilling methods are being used as weighted in Turkey. This is caused by economical situations of drilling companies besides the geological conditions. However, it is observed that water well drilling sector's wish to use air drilling increased in recent years.
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    Sediment permeabilitelerinin hesaplanmasında yapay sinir ağları modeli
    (2004) Bayram, A. Ferhat; Gültekin, S. Sinan; Kansun, Gürsel
    En çok kullanılan altı adet geçirimlilik denklemlerinden üretilen veriler, yapay sinir ağlarına (YSA) uygulanarak, yeni bir geçirimlilik değeri bulunmuştur. Geçirimlilik değişkenleri olarak gözeneklilik (n) ve efektif tane çapı (d_{10}) alınmıştır. Her denklemde bu parametrelere bağlı olarak üretilen geçirimlilik değerleri yapay sinir ağlarının verilerini oluşturmaktadır. Böylece altı değişik denklem YSA da birleştirilerek tek bir geçirimlilik sonucu grafiksel olarak sunulmuştur. Yapay sinir ağında Çok Katmanlı Ağ Yapısı (Multi - Layer Perceptrons) ve öğrenme algoritması olarak Genişletilmiş Delta Bar Delta (GDBD) kullanılmıştır. Yapay sinir ağı modeli kullanılarak çakıl, kum ve şilt için ayrı ayrı elde edilen geçirimlilik sonuçları denklemsel geçirimlilik sonuçlarıyla oldukça iyi uyumluluk göstermektedir.