Yazar "Ozcakal, Emrah" seçeneğine göre listele

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    AGRICULTURAL DROUGHT ANALYSIS IN AEGEAN REGION, TURKEY
    (Parlar Scientific Publications (P S P), 2020) Mengu, Gulay Pamuk; Ozcakal, Emrah; Akkuzu, Erhan
    The aim of this study was to determine the climatological precipitation deficit index (PD), one of the indices used in monitoring agricultural drought, using monthly climatic data from the period 1975-2014 in the Aegean region, Turkey. Temporal variations in the index were examined by Mann-Kendall trend analysis. The long term average precipitation in the region is 624 mm, the reference evapotranspiration calculated by the Penman-Monteith method is 1208 mm. The average precipitation deficit values (PD) of station in the region varied between 70 and 934 mm. As a result of trend analysis conducted for the precipitation deficit parameter, statistically significant increasing trends were found at eight of the 31 stations in the study area, and a decreasing trend at one station. There was an increasing trend at 15 of the remaining stations, but this was found not to be statistically significant. The increasing trends determined within the study period varied between 5.228 and 7.974 mm/year.
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    Optimization of Irrigation Programming for Different Water Allocation Strategies at Network Level: Method and Application
    (Springer, 2024) Kilic, Murat; Ozcakal, Emrah
    Optimum irrigation programming at network level is important not only for maximum yield and benefit from the system but also for sustainable use of constrained resources. The subject of this investigation is to devise a method which enables optimum water allocation in irrigation networks, to apply it to a real system, and to analyze the results. In the first step, the irrigation district was divided into the most suitable water allocation zones considering the hydraulic properties of the canals. Next, alternative system rotation periods were defined in accordance with the properties of the research area, the hydraulic infrastructure of the irrigation network and the crop pattern. In this process, the model was run for five different water allocation strategies. The model was applied to the command area of Sar & imath;k & imath;z Irrigation Association in the Ahmetli Regulator Right Bank Irrigation System in the Gediz Basin. Therefore, irrigation programs were prepared for the crop pattern, which receives water from 45 tertiary canals of the Y9 secondary. The irrigation time allocated to each tertiary canal and the amount of irrigation water were evaluated, together with the water shortage levels which occurred in these tertiary canals. The results indicated that the model defined the optimum system rotation period, the borders and the sizes of the most suitable water allocation zones, and the most suitable irrigation programs under the prevailing conditions. The proposed model can provide an insight for decision makers as a decision support tool.
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    Production of biodiesel from safflower plant cultivated using membrane bioreactor (MBR) effluent discharged from wastewater treatment plant
    (Wiley, 2020) Falizi, Nasim Jalilnejad; Madenoglu, Tulay Gungoren; Kurttas, Yasemin Kukul; Meric, Kamil; Gurgulu, Hatice; Ozcakal, Emrah; Kabay, Nalan
    BACKGROUND Increased water demand caused by population growth has forced the reuse of wastewater after treatment. Safflower is a salt-tolerant plant that can be irrigated with moderately saline water. Cultivation of safflower plant can be achieved by irrigation with membrane bioreactor (MBR)-treated wastewater and further utilized in oil and then biodiesel production according to standard (TS EN 14214). Irrigation water quality can impact oil and biodiesel yield and content. RESULTS in this study, safflower plants were cultivated using different irrigation strategies in a field next to a wastewater treatment plant in Menderes-Izmir, Turkey. These strategies were: irrigation weekly with MBR-treated wastewater or with tap water; with MBR-treated wastewater just three times during phenological periods; and without irrigation. Oil yields for seeds of the plants irrigated by these strategies were 103.8, 98.7, 63.7 and 57.4 (kg oil daa(-1)), respectively. Oil yield was found to be highest following weekly irrigation with MBR-treated wastewater that has a high salinity of 4 mS cm(-1). Safflower oil methyl ester (SOME) contents of biodiesel were 94.6 and 94.5% (g SOME:g biodiesel), and ester yields of biodiesel were 71.3 and 81.4% (g biodiesel:g oil(-1)) for safflower irrigated weekly with MBR-treated wastewater and tap water, respectively. CONCLUSION It is concluded that SOME yields and contents of safflowers irrigated with MBR-treated wastewater and tap water weekly are so close. (c) 2019 Society of Chemical Industry
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    Temporal Change of Climatological Precipitation Deficit Index in the Buyuk Menderes Basin, Turkey
    (Amer Soc Agronomy, 2019) Mengu, Gulay Pamuk; Yildirim, Tugba; Ozcakal, Emrah; Akkuzu, Erhan
    Climatological precipitation deficit index (PD) is one the indices used to monitor agricultural drought by examining the difference between precipitation and evapotranspiration. In this study, the meteorological stations located in the Buyuk Menderes Basin, which has an important agricultural potential for Turkey, are used to determine the PD and its temporal variation by Mann-Kendall trend analysis using the monthly climate data of the period 1975 to 2014. The long-term average rainfall in the Buyuk Menderes Basin is 574 mm, the reference evapotranspiration is 1225 mm, and the average PD value is 651 mm. It was observed that the value of the precipitation deficit in the basin varies considerably in the long term. The trend analysis showed five of the six stations in the basin to have an increasing trend, which in three of these five stations was statistically significant. It was concluded that the increasing trend determined in the precipitation deficit derived more from the increases determined in the ET0 values than from the decrease in precipitation.
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    Use of geothermal fluid for agricultural irrigation: preliminary studies in Balcova-Narlidere Geothermal Field (Turkey)
    (Scientific Technical Research Council Turkey-Tubitak, 2021) Meric, Mehmet Kamil; Kukul, Yasemin Senem; Ozcakal, Emrah; Barlas, Neriman Tuba; Cakici, Ilakan; Jarma, Yakubu Abdullahi; Kabay, Nalan
    Balcova-Narlidere Geothermal Field (BNGF) hosts the largest geothermal district heating system of Turkey and several geothermal wells used for district heating and thermal tourism activities. This study assesses the use of BNGF geothermal fluid for agricultural activities. The spent geothermal brine was treated using nanofiltration and reverse osmosis membranes on a pilot-scale membrane test system. The qualities of the product were evaluated in terms of agricultural irrigation integrated with the implemented innovative wireless sensor network. It is important to use geothermal fluid, which is consists of valuable minerals, for irrigation. But when using geothermal fluid in irrigation, the chemical composition of the water must be carefully monitored to prevent damage to the plants. Nevertheless, the first result shows that the use of geothermal fluid to irrigate is proving to be a promising and economically viable option in BNGF.
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    Utilization of membrane separation processes for reclamation and reuse of geothermal water in agricultural irrigation of tomato plants-pilot membrane tests and economic analysis
    (Elsevier, 2022) Jarma, Yakubu A.; Karaoglu, Asli; Senan, Islam Rashad Ahmed; Meric, Mehmet Kamil; Kukul, Yasemin Senem; Ozcakal, Emrah; Barlas, Neriman Tuba
    The quality of irrigation water is critical for enhancing agricultural productivity. As a result, this research was carried out with the aim of treating spent geothermal water before it is used for agricultural irrigation. While doing that, cost analysis of the system was taken into consideration as well. The product water was targeted to suit irrigation water standards for tomato plants. Two commercially available pressure driven membranes (NF8040-70 as NF membrane and TM720D-400 as RO membrane) were employed for this task. A constant applied pressure of 15 bar and 60% of water recovery were kept constant during the product water production while mode of operation for the membrane system was continuous. According to Turkish Ministry of Environment and Urbanization irrigation water standards and the results obtained from this study, it was clearly seen that both NF and RO product waters meet the quality I class irrigation water standards with respect total dissolved substances (TDS), electrical conductivity (EC), concentrations of Na+ and Cl- ions. Quality 1 means that the produced water will not cause any environmental effect when employed for irrigation purpose. Nevertheless, the produced water was found not to obey the irrigation standards with respect to sodium adsorption ratio (SAR) and boron concentration (quality III class). Quality III explains that the water will cause soil infiltration problems when employed for irrigation purpose. Since most of the minerals needed for plant growth were rejected by NF and RO membranes, an appropriate mixing ratio of the product water with well water for remineralization was determined. Mixing 50 and 60% of well water with the product waters of NF (50%) and RO (40%) membranes, respectively was found to be the optimum mixing ratios to produce the requested water quality for tomato irrigation. Quality II class irrigation water which can be applied with caution was targeted in terms of SAR as well as boron concentration (2-4 and 4-6 mg/L) while determining the mixing ratios. The cost of the product water was found as 0.76 and 1.56$/m(3) for NF and RO processes, respectively.