Yazar "Firat, M." seçeneğine göre listele

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    Analyzing the effect of the unreported leakages in service connections of water distribution networks on non-revenue water
    (Springer, 2019) Boztas, F.; Ozdemir, O.; Durmuscelebi, F. M.; Firat, M.
    In water distribution systems, depending on various factors, the failures and leakages occur in service connections, main pipes, and fittings. A significant part of these leakages are not visible at surface, occur underground, and are expressed as unreported leakages. The aim of this study was to investigate and analyze the effect of the unreported leakages occurring on service connections to water loss volume by applying a water loss model based on the minimum night flow and the active leakage control methods. For this aim, a total of 14 district metered areas in Malatya water distribution system were selected as study area. For the water loss model, the minimum night flows were monitored at the lowest consumption times, and the potential leakages points were detected by applying active leakage control method. As a result of this method, a high rate of 77.4% of the identified leakages was observed in service connections. After repairing the leakages detected in the district metered areas, it was determined that a total reduction of approximately 148.9l/s was achieved at minimum night flow. In the study, it was determined that the water loss model developed on the basis of minimum night flow and active leakage control methods provided important contributions to the monitoring, detection and control of the unreported leakages. Furthermore, according to the developed water loss model, it has been determined that a significant portion of the unreported leakages are caused by leakages that occur in the service connections and cause significant water loss.
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    Economic Analysis and Economic Leakage Level in Water Loss Management and Paths for Future Evaluation: A Review
    (Univ Tehran, Coll Engineering, 2022) Firat, M.; Ates, A.; Yilmaz, S.; Ozdemir, O.
    Operational and investment costs increase due to aging of the network, increasing the failure rate, leakage and the water demand, new investments and energy consumption. Several methods and tools with different initial investment and operating costs are proposed for reducing water losses in the related literature. The aim of this study is to make detailed evaluations within the framework of economic components for effective and sustainable water loss management and provide a reference for further studies. The most important advantage is that there has not been a detailed assessment and discussion in this context within the framework of economic analysis and the economic leakage level. The methods and tools for reducing the water losses such as district metered areas, passive leakage control, active leakage control, pressure management, pipe management and network renewal methods, were evaluated economically and discussed. The most important issues in water loss management are the definition of the economic leakage level and the cost components that are the maintenance and break repair, methods applied to detect and control the leaks and automation systems for monitoring, control and data transfer. Moreover, the priority, suitability, applicability and economic impact of the methods should be considered to decide the methods for more efficient use of resources.
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    Identification of homogeneous regions and regional frequency analysis for Turkey
    (Sharif Univ Technology, 2014) Firat, M.; Koc, A. C.; Dikbas, F.; Gungor, M.
    Ward's hierarchical clustering method is applied to classify the annual floods and identify the hydrologic homogeneous regions in Turkey. For this aim, the annual flood data obtained at the 117 gauging stations having data records of 31 years operated by the general directorate of electrical power resources survey and development administration (EIE) throughout Turkey are considered. Discordancy and regional homogeneity measures are applied to test homogeneity of regions identified by Ward's cluster method. Flood frequency analyses for seven sub-groups defined by Ward's clustering method are carried out using various frequency distributions based on index flood and L-moments approaches. The best fit distributions for all sub-regions are identified based on L-moments goodness of fit statistic. The accuracy of results of quantile estimates are evaluated by using relative RMSE% and relative BIAS% through the use of Monte Carlo simulation. (C) 2014 Sharif University of Technology. All rights reserved.