İnşaat Mühendisliği Bölümü Yayın Koleksiyonu

Permanent URI for this collectionhttps://hdl.handle.net/20.500.12416/395

Browse

Now showing 1 - 20 of 23

Citation Count: Ak, Mümtaz; Kentel, Elçin; Küçükali, Serhat, "A fuzzy logic tool to evaluate low-head hydropower technologies at the outlet of wastewater treatment plants", Renewable & Sustainable Energy Reviews, Vol.68, pp.727-737, (2017).
A fuzzy logic tool to evaluate low-head hydropower technologies at the outlet of wastewater treatment plants
(Pergamon-Elsevier Science LTD, 2017) Ak, Mümtaz; Kentel, Elçin; Küçükali, Serhat; 20413
This study aims to find the most sustainable mature Low-Head (LH) hydropower technology option to generate hydroelectricity at the outlet of wastewater treatment plants by assessing the relevant economic, technical, and environmental criteria. A total of six criteria are assessed: investment cost, payback period, energy generation performance, construction duration, fish-friendliness, and aeration capacity. The fuzzy logic tool estimates satisfaction of each criterion separately and then aggregates them into an Overall Performance Index. The proposed method is applied to an existing wastewater treatment plant (Tatlar WWTP) in Ankara, Turkey. For the assessment, the real-time operational data of the plant and the technical drawings are employed. According to the multi-criteria analysis tool developed in this study to evaluate the LW technologies' the most appropriate hydropower technology for the outlet of Tatlar WWTP is found to be the Archimedean screw, because of its superior environmental and economic performance.
Citation Count: Dinckal, Cigdem; Toreyin, Bechet Ugur; Kucukali, Serhat (2017). Adaptive decision fusion based framework for short-term wind speed and turbulence intensity forecasting: case study for North West of Turkey, Turkish Journal Of Electrical Engineering And Computer Sciences, 25(4), 2770-2783.
Adaptive decision fusion based framework for short-term wind speed and turbulence intensity forecasting: case study for North West of Turkey
(Tubitak Scientific & Technical Research Council Turkey, 2017) Dinçkal, Çiğdem; Töreyin, Behçet Uğur; Küçükali, Serhat; 20413; 26773
In this paper, an online learning framework called adaptive decision fusion (ADF) is employed for short-term wind speed and turbulence intensity forecasting by use of wind speed data for each season for the city of Izmit, located in the northwest of Turkey. Fixed-weight (FW) linear combination is derived and used for comparison with ADF. Wind speeds and turbulence intensities are predicted from the existing wind speed data and computed turbulence intensities, respectively, using the ADF and FW methods. Simulations are carried out for each season and the results are tested on mean absolute percentage error criterion. It is shown that the proposed model captured the system dynamic behavior and made accurate predictions based on the seasonal wind speed characteristics of the site. The procedure described here can be used to estimate the local velocity and turbulence intensity in a wind power plant during a storm.
Citation Count: Uzuntarla, F.; Kücükali, S.; Uzuntarla, Y. (2020). "An analysis on the relationship between safety awareness and safety behaviors of healthcare professionals, Ankara/Turkey", Journal of Occupational Health, Vol. 62, No. 1.
An analysis on the relationship between safety awareness and safety behaviors of healthcare professionals, Ankara/Turkey
(2020) Uzuntarla, F.; Kücükali, S.; Uzuntarla, Y.; 20413
Objectives: This descriptive study aims to examine the relationship between the safety awareness of healthcare professional and their safety behaviors. Methods: The study was carried out on 418 healthcare professionals working in a training and research hospital in Ankara/Turkey. The survey method was used as data collection tool. The questionnaire consisted of 3 sections and 18 questions. First section consisted of questions on sociodemographic characteristics and, second section consisted of the awareness scale and third section consisted of safety behaviors scale. Results: The safety awareness and safety behaviors are scored on a scale from 1 (completely disagree) to 5 (completely agree). The safety awareness and safety behaviors has an average score of 3.85 ± 0.81 and 3.56 ± 0.82, respectively. The safety awareness and safety behavior levels of healthcare professionals were found to be high. Conclusion: A significant positive correlation was found between safety awareness and safety behaviors and it was concluded that the increase in safety awareness led to an increase in safety behavior. © 2020 The Authors. Journal of Occupational Health published by John Wiley & Sons Australia, Ltd on behalf of The Japan Society for Occupational Health
Citation Count: Kucukali, Serhat, "An experimental investigation of flow resistance and turbulent flow in brush fish pass", Proceedings of the Institution of Civil Engineers-Water Management, Vol. 172, No. 5, pp. 241-256, (2019).
An experimental investigation of flow resistance and turbulent flow in brush fish pass
(Ice Publishing, 2019) Küçükali, Serhat; 20413
The present study aimed to search for chicken abdominal fat deposition-related polymorphisms within RB1 and to provide functional evidence for significantly associated genetic variants. Association analyses showed that 11 single nucleotide polymorphisms (SNPs) in intron 17 of RB1, were significantly associated with both abdominal fat weight (P < 0.05) and abdominal fat percentage (P < 0.05). Functional analysis revealed that the A allele of g.32828A>G repressed the transcriptional efficiency of RB1 in vitro, through binding nuclear factor-kappa B (NF-B-K) and SRY-related HMG box protein 2 (SOX2). Furthermore, RB1 mRNA expression levels in the abdominal fat tissue of individuals with the A/A genotype of g.32828A>G were lower than those of individuals with the G/G genotype. Collectively, we propose that the intronic SNP g.32828A>G of RB1 is an obesity-associated variant that directly affects binding with NF-B-K and SOX2, leading to changes in RB1 expression which in turn may influence chicken abdominal fat deposition.
Citation Count: S. Küçükali. "An investigation of the hydrodynamic and fish behavior characteristics of the brush-type fish passage: Iyidere (Turkey) field study ," Fish Passage 2017: International Conference on Engineering and Ecohydrology for Fish Passage , Oregon, United States Of America, pp.1, 2017.
An investigation of the hydrodynamic and fish behavior characteristics of the brush-type fish passage: Iyidere (Turkey) field study
(2017) Küçükali, Serhat; 20413
Citation Count: Baris, Kemal; Kucukali, Serhat, "Availibility of renewable energy sources in Turkey: Current situation, potential, government policies and the EU perspective", Energy Policy, Vol. 42, pp. 377-391, (2012)
Availibility of Renewable Energy Sources in Turkey: Current Situation, Potential, Government Policies and the Eu Perspective
(Elsevier SCI LTD, 2012) Barış, Kemal; Küçükali, Serhat; 20413
Citation Count: Bölük, g. ;Küçükali, Serhat (2014). "Biogas Energy in Turkey: Current Situation, Sustainability and Policy Implications, Energy Science and Technology," Energy Science and Technology , Vol.7, No.2, pp.1-5.
Biogas Energy in Turkey: Current Situation, Sustainability and Policy Implications, Energy Science and Technology
(2014) Bölük, G.; Küçükali, Serhat; 20413
Citation Count: Küçükali, Serhat (2016). "Brush-baffle fish pass: a continuous migration corridor for fish", HYDRO 2016, Bordeaux, Fransa, 10 - 12 Ekim 2016, ss.1-10.
Brush-baffle fish pass: a continuous migration corridor for fish
(2016) Küçükali, Serhat; 20413
Citation Count: Küçükali, Serhat...et al. Ecological Assessment: Use of Hydropower and Biogas Energy in Waste Water Treatment Plants, in Life Cycle Assessment of Wastewater Treatment,
Ecological Assessment: Use of Hydropower and Biogas Energy in Waste Water Treatment Plants
(CRC Press, 2018) Küçükali, Serhat; Ar, I. İrfan; Ak, Mümtaz; Günal, Asiye; 20413
Citation Count: Kokpinar, Mehmet Ali; Kucukali, Serhat, "Effect of particle size on flip bucket scour", Canadian Journal of Civil Engineering, Vol. 43, No. 8, pp. 759-768, (2016).
Effect of particle size on flip bucket scour
(Canadian Science Publishing, 2016) Kökpinar, Mehmet Ali; Küçükali, Serhat; 20413
This study quantifies the dimensionless maximum scour depth d(s)/D-50 downstream of flip buckets as a function of the square of the densimetric Froude number Fr-d(2), jet Reynolds number Re, lip angle, and sediment non-uniformity constant. The proposed formula is valid for Fr-d = 2.9-29.69, Re = 8.9 x 10(3)-4.2 x 10(5), and We > 32. Moreover, the scour profiles for different sediment sizes (D-50 = 3-17 mm) are presented from the Kigi Dam physical model and the effect of the Reynolds number on scour process is discussed. The prediction capacity of the proposed formula is compared with the existing empirical formulas in the literature and it is shown that the proposed dimensionally homogenous formula made better estimations. The procedure described here has a sound physical basis and it can be used to estimate the maximum scour depth downstream of flip buckets.
Citation Count: Bartan, Ayfer; Kucukali, Serhat; Ar, Irfan (2017). Environmental impact assessment of coal power plants in operation, Conference: International Conference on Advances in Energy Systems and Environmental Engineering (ASEE), International Conference On Advances in Energy Systems And Environmental Engineering (Asee17), 22.
Environmental impact assessment of coal power plants in operation
(E D P Sciences, 2017) Bartan, Ayfer; Küçükali, Serhat; Ar, İrfan; 20413
Coal power plants constitute an important component of the energy mix in many countries. However, coal power plants can cause several environmental risks such as: climate change and biodiversity loss. In this study, a tool has been proposed to calculate the environmental impact of a coal-fired thermal power plant in operation by using multicriteria scoring and fuzzy logic method. We take into account the following environmental parameters in our tool: CO, SO2, NOx, particulate matter, fly ash, bottom ash, the cooling water intake impact on aquatic biota, and the thermal pollution. In the proposed tool, the boundaries of the fuzzy logic membership functions were established taking into account the threshold values of the environmental parameters which were defined in the environmental legislation. Scoring of these environmental parameters were done with the statistical analysis of the environmental monitoring data of the power plant and by using the documented evidences that were obtained during the site visits. The proposed method estimates each environmental impact factor level separately and then aggregates them by calculating the Environmental Impact Score (EIS). The proposed method uses environmental monitoring data and documented evidence instead of using simulation models. The proposed method has been applied to the 4 coal-fired power plants that have been operation in Turkey. The Environmental Impact Score was obtained for each power plant and their environmental performances were compared. It is expected that those environmental impact assessments will contribute to the decision-making process for environmental investments to those plants. The main advantage of the proposed method is its flexibility and ease of use.
Citation Count: Küçükali, Serhat, "Environmental risk assessment of small hydropower (SHP) plants: A case study for Tefen SHP plant on Filyos River" Energy For Sustainable Development, Vol.19, pp.102-110, (2014).
Environmental risk assessment of small hydropower (SHP) plants: A case study for Tefen SHP plant on Filyos River
(Elsevier Science BV, 2014) Küçükali, Serhat; 20413
A multi-criteria scoring tool is used to assess the environmental risk level of small hydropower plants on the basis of documented evidence, measured data, and on-site observations. The assessment is based on evaluating compliance with the standards of the European Bank for Reconstruction and Development (EBRD). The following environmental criteria are assessed: environmental flow, water quality, fish passage and protection, watershed protection, threatened and endangered species. I evaluated the Tefen hydropower plant, which has been in operation on the Filyos River in northwestern Turkey since 2011. The assessment showed that the plant failed all of the EBRD criteria. (C) 2013 International Energy Initiative.
Citation Count: Kucukali, Serhat, "Finding The Most Suitable Existing Hydropower Reservoirs For The Development Of Pumped-Storage Schemes: An Integrated Approach", Renewable & Sustainable Energy Reviews, 37, pp. 502-508, (2014).
Finding The Most Suitable Existing Hydropower Reservoirs For The Development Of Pumped-Storage Schemes: An Integrated Approach
(Pergamon-Elsevier Science LTD, 2014) Küçükali, Serhat; 20413
This study aims to evaluate existing hydropower reservoirs for the development of pumped-storage schemes by using multi-criteria scoring technique. This method enables a screening of existing hydropower reservoirs, in order to assess and rank potential sites for pumped-storage development. This analysis is based on the documented evidence, measured data, and site surveys. The site assessments are categorized in 6 criteria namely geometrical conditions (maximum head, head to water way length ratio, distance to grid connection), geological conditions, environmental, and social conditions. In the context of the study, 7 existing hydropower reservoirs in Turkey, each with a catchment area of more than 50 km(2), are evaluated in order to be utilized as the lower reservoirs of pumped-storage facilities. The overall score of each candidate site is obtained and, their performance is compared. The results indicate that Turkey have suitable existing hydropower reservoirs for the development of pumped-storage facilities. However, the country lacks from legal and market framework for the establishment of pumped-storage power plants. (C) 2014 Elsevier Ltd. All rights reserved.
Citation Count: Küçükali, serhat; Al Bayatı, Omar; Maraş, H. Hakan (2021). "Finding the most suitable existing irrigation dams for small hydropower development in Turkey: A GIS-Fuzzy logic tool", Renewable Energy, Vol. 172, pp. 633-650.
Finding the most suitable existing irrigation dams for small hydropower development in Turkey: A GIS-Fuzzy logic tool
(2021) Küçükali, Serhat; Al Bayatı, Omar; Maraş, H. Hakan; 20413
This paper enables a screening of existing irrigation dams in order to assess and rank potential sites for small hydropower development by using a Geographic Information System (GIS)-fuzzy logic multi-criteria scoring technique. The following criteria are evaluated: dam characteristics (reservoir normal level, reservoir capacity, dam purpose, dam ageing), and grid connection spatial characteristics. The proposed method estimates the suitability degree of each criterion separately and then aggregates them into a Site Suitability Index (SSI). Existing irrigation dams in Turkey are assessed in order to be utilized for hydropower development. The overall score of each candidate site is obtained and, their performance is compared for different strategies. One of the most suitable dams, Karadere, was chosen as a case study. By using the daily continuous monitored data, we showed that flow and head is highly variable during the irrigation season. Accordingly, we evaluated an innovative compact medium-head hydro turbine that can capture those fluctuations with its operational flexibility and minimal civil works. Moreover, an optimal path methodology was applied to find the best grid connection route from the dam to its nearest substation considering the site land use characteristics in order to minimize land expropriation. © 2021 Elsevier Ltd
Citation Count: Küçükali, Serhat...et al (2018). "Flow and turbulence measurements in a diagonal brush fish pass: A field study", 7th IAHR International Symposium on Hydraulic Structures, ISHS 2018, pp. 241-252.
Flow and turbulence measurements in a diagonal brush fish pass: A field study
(2018) Küçükali, Serhat; Hassinger, R.; Verep, B.; Mutlu, T.; Ozelci, D.; 20413
This study aims to investigate flow and turbulence structure of a diagonal brush fish passage which has been constructed at the existing Small Hydropower Plant (SHP) on İyidere River on the East Black Sea Coast of Turkey. The flow and turbulence characteristics of diagonal brush fish pass were investigated in a 1.1 m wide rectangular flume with a bed slope of 10% for Reynolds and Froude numbers ranging between 3.45x104-2.4x105 and 0.15-0.16, respectively. By taking into account dynamic upstream water levels (H=101.20 m to H=102.05 m) of fish pass structure throughout the year, the vertical velocity profiles of different flow regions have been obtained by using Nivus instrument, whereas the turbulence quantities were gathered by measuring the three-dimensional instantaneous velocity fields using Micro acoustic Doppler velocimeter. The flow data was grouped for four different relative submergence of bristles. Thus, the analysis is done based on a physical basis and focus on the most important hydraulic parameters of velocity field, turbulence, and flow depth for fish passage design. The main findings of this study can be summarized as follows: (i) a significant proportion of energy dissipation (>50%) takes place in the brush plates with the vibration and bending of bristles, (ii) turbulent kinetic energy seems to be considerably lower for a same dissipated power in brush fish pass than other conventional fish passes (vertical slot and nature type), (iii) the turbulence intensities in the lateral velocity component were an important contributor to turbulence, and (iv) when the bristles are submerged, the maximum turbulent kinetic energy value is tripled. The flow is quasi-uniform and in subcritical regime which provides different migration corridors with typical hydraulic conditions and, very important for the fish, these corridors continue through the complete fish pass. The results from this study would be useful to fish-pass designers. © 2018 7th IAHR International Symposium on Hydraulic Structures, ISHS. All rights reserved.
Citation Count: Kucukali, Serhat; Hassinger, Reinhard, "Flow and Turbulence Structure in A Baffle-Brush Fish Pass", Proceedings of The Institution of Civil Engineers-Water Management, 171, No. 1, pp. 6-17, (2018).
Flow and Turbulence Structure in A Baffle-Brush Fish Pass
(Ice Publishing, 2018) Küçükali, Serhat; Hassinger, Reinhard; 20413
The flow an d turbulence characteristics of a new baffle-brush type fish pass were investigated experimentally in a 2 m wide rectangular flume with a bed slope of 4% and Reynolds and Froude numbers in the range 5 x 10(4)-2.8 x 10(5) and 0.17-0.23, respectively. The baffle-brush fishway combines the properties of a baffle (Larinier) fish pass with the features of the brush-furnished fishway. The baffle-brush fish pass ensures continuous low-and high-velocity migration corridors for both strong (e.g. salmon) and weak swimming (e.g. river lamprey) fish, with negligible flow accelerations (i.e. quasi-uniform conditions). The turbulent kinetic energy (TKE) takes its maximum value near the centre of the baffle zone and decays towards the brush zone. The effects of the Reynolds number (Re) on the resultant velocity and TKE distributions were also investigated. For Re = 2 x 10(5), the TKE was in the range 0.05-0.21 m(2)/s(2) with an average value of 0.11 m(2)/s(2) in the baffle section, whereas it ranged between 0.007 and 0.04 m(2)/s(2) with an average value of 0.02 m(2)/s(2) in the brush section. In the proposed fish pass there is no need to build resting pools.
Citation Count: Kucukali, Serhat; Hassinger, Reinhard, "Hydraulic Model Test Results Of Baffle-Brush Fish Pass", Proceedings of The Institution Of Civil Engineers-Water Management, 168, No. 4, pp. 189-194, (2015).
Hydraulic Model Test Results Of Baffle-Brush Fish Pass
(Ice Publishing, 2015) Küçükali, Serhat; Hassinger, Reinhard; 20413
The flow characteristics (depth, velocity, energy dissipation) of a new baffle-brush fish pass were investigated experimentally in a 2 m wide rectangular flume which has a bed slope of 4% for discharges of 100-550 l/s. In all the experiments, quasi-uniform and sub-critical flow conditions and Froude numbers between 0.17 and 0.23 were observed. The Darcy-Weisbach friction factor was negatively correlated with the relative submergence of the brush elements. Two different characteristic velocity regions were identified, namely the baffle region and the brush region. The turbulence intensities were in the range 38-79% in the baffle zone and 13-31% in the brush zone. The hydraulic test results showed that this type of fish pass can produce adequate flow depth and favourable local flow velocities for the design discharge of 0.2 m(2)/s (relative submergence of brushes = 1.03), which is suitable for different fish species.
Image Analysis Based Fish Tail Beat Frequency Estimation for Fishway Efficiency
(IEEE Computer Soc, 2018) Yıldırım, Yasin; Töreyin, Behçet Uğur; Küçükali, Serhat; Verep, Bülent; Turan, Davut; Alp, Ahmet; 20413
In this paper, we propose image analysis based methods for estimating fish tail beat frequency, which is an indicator of fish energy consumption at fish passage structures. For this purpose, average magnitude difference and autocorrelation function based periodicity detection techniques are utilized. Actual fish images are acquired using a visible range camera installed in a brush type fish pass in Ikizdere River, near Rize, Turkey, which is very rich in biodiversity. Results show that image analysis based periodicity detection methods can be used for fishway efficiency evaluation purposes. To the best of authors' knowledge, this is the first study that automatically estimates fish tail beat frequency using image analysis. The findings of this study are expected to have implications for fish monitoring and fishway design.
Citation Count: Küçükali, S. (2011). Risk assessment of river-type hydropower plants using fuzzy logic approach. Energy Policy, 93(10), 6683-6688. http://dx.doi.org/10.1016/j.enpol.2011.06.067
Risk assessment of river-type hydropower plants using fuzzy logic approach
(Elsevier Science Ltd, 2011) Küçükali, Serhat; 20413
In this paper, a fuzzy rating tool was developed for river-type hydropower plant projects, and risk assessment and expert judgments were utilized instead of probabilistic reasoning. The methodology is a multi-criteria decision analysis, which provides a flexible and easily understood way to analyze project risks. The external risks, which are partly under the control of companies, were considered in the model. A total of eleven classes of risk factors were determined based on the expert interviews, field studies and literature review as follows: site geology, land use, environmental issues, grid connection, social acceptance, macroeconomic, natural hazards, change of laws and regulations, terrorism, access to infrastructure and revenue. The relative importance of risk factors was determined from the survey results. The survey was conducted with the experts that have experience in the construction of river-type hydropower schemes. The survey results revealed that the site geology and environmental issues were considered as the most important risks. The new risk assessment method enabled a Risk Index (R) value to be calculated, establishing a 4-grade evaluation system. The proposed risk analysis will give investors a more rational basis to make decisions and it can prevent cost and schedule overruns
Citation Count: Kucukali, Serhat, "Risk scorecard concept in wind energy projects: An integrated approach", Renewable & Sustainable Energy Reviews, Vol. 56, pp. 975-987, (2016).
Risk scorecard concept in wind energy projects: An integrated approach
(Pergamon-Elsevier Science LTD, 2016) Küçükali, Serhat; 20413
The proposed risk assessment tool quantifies economic, environmental, political, and societal risks in wind energy projects. The risks are quantified based on the measured data and document evidence. An important component of the proposed methodology includes converting different external risks into a common scale and these scales express the level of risk factors. A survey was conducted with the experts in order to determine the relative importance of external risks. Applicability of the proposed tool is tested on real time wind power plants that are located in Izmir Province on the Aegean coast of Turkey. Change in laws and regulations, environmental issues, local community, grid connection, land use and permits, and erroneous wind resource assessment appeared to be key risk factors. The findings of case studies showed that the perception of inadequate understanding of the potential risks can lead to significant revenue loss. The proposed method estimates each risk factor level separately and then aggregates them by calculating the Project Risk Score (PRS) which is linked to the normalized revenue loss. (C) 2015 Elsevier Ltd. All rights reserved.

Browse

Browsing İnşaat Mühendisliği Bölümü Yayın Koleksiyonu by Author "20413"