Elçi, Şebnem
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Elci, Sebnem
Elçi, Ş.
Elci, S
Elci, S.
Elçi, Ş
Elçi, Ş.
Elci, S
Elci, S.
Elçi, Ş
Job Title
Email Address
sebnemelci@iyte.edu.tr
Main Affiliation
03.03. Department of Civil Engineering
Status
Current Staff
ORCID ID
Scopus Author ID
Turkish CoHE Profile ID
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WoS Researcher ID
Sustainable Development Goals
1NO POVERTY
0
Research Products
2ZERO HUNGER
3
Research Products
3GOOD HEALTH AND WELL-BEING
2
Research Products
4QUALITY EDUCATION
1
Research Products
5GENDER EQUALITY
0
Research Products
6CLEAN WATER AND SANITATION
16
Research Products
7AFFORDABLE AND CLEAN ENERGY
12
Research Products
8DECENT WORK AND ECONOMIC GROWTH
3
Research Products
9INDUSTRY, INNOVATION AND INFRASTRUCTURE
7
Research Products
10REDUCED INEQUALITIES
0
Research Products
11SUSTAINABLE CITIES AND COMMUNITIES
6
Research Products
12RESPONSIBLE CONSUMPTION AND PRODUCTION
5
Research Products
13CLIMATE ACTION
7
Research Products
14LIFE BELOW WATER
6
Research Products
15LIFE ON LAND
3
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16PEACE, JUSTICE AND STRONG INSTITUTIONS
0
Research Products
17PARTNERSHIPS FOR THE GOALS
1
Research Products
Documents
36
Citations
697
h-index
11
Documents
36
Citations
650
Scholarly Output
49
Articles
29
Views / Downloads
105784/18656
Supervised MSc Theses
9
Supervised PhD Theses
2
WoS Citation Count
644
Scopus Citation Count
756
Patents
1
Projects
10
WoS Citations per Publication
13.14
Scopus Citations per Publication
15.43
Open Access Source
32
Supervised Theses
11
| Journal | Count |
|---|---|
| 40th IAHR World Congress -- AUG 21-25, 2023 -- Vienna, AUSTRIA | 3 |
| Journal of Hydraulic Engineering | 3 |
| Water Environment Research | 2 |
| Water Resources Management | 2 |
| Encyclopedia of Earth Sciences Series | 1 |
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49 results
Scholarly Output Search Results
Now showing 1 - 10 of 49
Article Citation - WoS: 4Citation - Scopus: 4Destratification of Thermally Stratified Water Columns by Air Diffusers(Elsevier, 2023) Elçi, Şebnem; Hazar, Oğuz; Bahadıroğlu, Nisa; Karakaya, Derya; Bor, AslıThis study aims at improving the understanding in order to optimise an aeration system for artificial destratification to control cyanobacteria growth in the reservoirs. Previous applications for artificial destratification in reservoirs were based on installations based on computational methods, where neither the effect of air bubble size and configuration nor the effect of air density in the bubble plume could be investigated. This study seeks for an optimized design with the help of experimental and numerical analyses. In order to perform experimental studies, a novel water tank enabling the heating/cooling of the water column as desired and a diffuser system were manufactured. During the experimental studies, effect of bubble size, bubble slip velocity, and other parameters of air diffuser on destratification efficiency were investigated. Based on the nondimensional parameters, a new destratification efficiency formula is obtained by the Genetic Algorithm (GA) approach. Additionaly, the hydrodynamics of the water tank during the mixing process by air diffuser was simulated via 3D numerical model and validated with experimental results. The Eulerian multiphase model with the ‘degassing’ boundary condition and k-ω turbulence model are found to be suitable for the purposes of the study. Based on the error analysis of comparisons of the model and observations, the best configuration of air diffuser is proposed, and the numerical model is found to be successful in simulating the destratification of thermally stratified water columns by air diffuser.Conference Object Citation - Scopus: 1Morphological Analysis of Büyük Menderes River Over the Years Using Satellite Imagery(IAHR-Int Assoc Hydro-Environment Engineering Research, 2023) Bor, Asli; Hazar, Oguz; Elci, SebnemBoth bank erosion and sediment deposition on the inner margins are important watershed management problems for streams. Bank erosion not only causes the loss of agricultural lands, but also leads to the narrowing of the cross sections of the streams with the accumulation of sediment in the interior, resulting in floods, damage to the cultivated areas, reduction in dam reservoir lifespan and thus, serious damage to a country's economy. In this study, the morphological analysis of the B. Menderes River, which is one of the most important rivers of Turkey and a residential and intensive agriculture region, for the thirty-year period between 1990-2020 is made via utilization of QGIS for the analysis of Landsat satellite images. This study is thought to be a preliminary study to quantify the morphological changes in B.Menderes River and is expected to be a basis for linking these changes to the changes in the hydrological regime in the basin. During this analysis, the shoreline of the main river, approximately 570 km long, was divided into 10 segments and the sinuosity index values, which are fold parameters, were calculated for each segment. According to the study, it is found that the curvature of the meanders of the B. Menderes River varies between 1.5 and 2.5 in most places.Article Citation - WoS: 5Citation - Scopus: 5Developing Predictive Equations for Water Capturing Performance and Sediment Release Efficiency for Coanda Intakes Using Artificial Intelligence Methods(MDPI, 2022) Hazar, Oğuz; Tayfur, Gökmen; Elçi, Şebnem; Singh, Vijay P.Estimation of withdrawal water and filtered sediment amounts are important to obtain maximum efficiency from an intake structure. The purpose of this study is to develop empirical equations to predict Water Capturing Performance (WCP) and Sediment Release Efficiency (SRE) for Coanda type intakes. These equations were developed using 216 sets of experimental data. Intakes were tested under six different slopes, six screens, and three water discharges. In SRE experiments, sediment concentration was kept constant. Dimensionless parameters were first developed and then subjected to multicollinearity analysis. Then, nonlinear equations were proposed whose exponents and coefficients were obtained using the Genetic Algorithm method. The equations were calibrated and validated with 70 and 30% of the data, respectively. The validation results revealed that the empirical equations produced low MAE and RMSE and high R2 values for both the WCP and the SRE. Results showed outperformance of the empirical equations against those of MNLR. Sensitivity analysis carried out by the ANNs revealed that the geometric parameters of the intake were comparably more sensitive than the flow characteristics.Article Citation - WoS: 184Citation - Scopus: 233Effects of Thermal Stratification and Mixing on Reservoir Water Quality(Springer Verlag, 2008) Elçi, ŞebnemIn this study, the effect of thermal stratification on water quality in a reservoir has been investigated by field observations and statistical analysis. During the summer period, when stratification is evident, field observations indicate that the observed dissolved oxygen concentrations drop well below the standard limit of 5 mg l-1 at the thermocline, leading to the development of anoxia. The reasons for variations in the dissolved oxygen concentrations were investigated. Variations of air temperature and other meteorological factors and lateral flows from side arms of the lake were found to be responsible for the increase of dissolved oxygen concentrations. It was also observed that turbidity peaked mostly in the thermocline region, closely related to the location of the maximum density gradient and thus low turbulence stabilizing the sediments in the vertical water column. Relatively cold sediment-laden water flowing into the lake after rain events also resulted in increased turbidity at the bottom of the lake. Nondimensional analysis widely used in the literature was used to identify the strength of the stratification, but this analysis alone was found insufficient to describe the evolution of dissolved oxygen and turbidity in the water column. Thus correlation of these parameters was investigated by multivariate analysis. Fall (partial mixing), summer (no mixing), and winter (well mixed) models describe the correlation structures between the independent variables (meteorological parameters) and the dependent variables (water-quality parameters). Statistical analysis results indicate that air temperature, one day lagged wind speed, and low humidity affected variation of water-quality parameters. © The Japanese Society of Limnology 2008.Conference Object 14th of the International Conference on Hydroscience and Engineering, Iche 2022: Proceeding Book(Izmir Institute of Technology, 2022) Elçi, Şebnem; Bombar, Gökçen14th of the International Conference on Hydroscience & Engineering, ICHE 2022 will be held in Izmir, Turkey on 26-27 May, 2022. The International Conference on Hydroscience & Engineering began in Washington DC in 1993, and followed by Beijing hosted ICHE in 1995, Cottbus (1998), Seoul (2000), Warsaw (2002), Brisbane (2004), Philadelphia (2006), Nagoya (2008), Chennai (2010), Orlando (2012), Hamburg (2014) Tainan (2016) and Chongqing (2018). These conferences provided a common ground researchers and engineers to report and discuss the latest scientific advancements and practitioner’s solutions in hydroscience and engineering. ICHE 2022 conference aims to bring together researchers and practicing engineers to share the latest scientific and technological advancements in hydroscience and engineering, and will provide networking opportunities for future activities. Participants will be able to hear experts in the field discuss the latest achievements in issues relevant to Hydro-Engineering for Sustainable Development.Master Thesis Simulation of Water Resources of Tahtalı-Seferihisar Sub-Basin Based on Weap Model(Izmir Institute of Technology, 2021) Karahan, Sait Mutlu; Elçi, ŞebnemWater is a vital resource for humanity and nature, and the lack of water affects life in all areas. Today, problems such as the inability to protect the status of existing water resources and excessive water withdrawal cause the amount of water to decrease day by day. In addition, conditions such as urbanization and industrialization and the resulting population increase, deterioration of water quality due to chemicals used in agricultural activities, and climate change affect the availability of water resources negatively. In this study, a basin-based water management study was carried out by applying the "Integrated Water Resources Management" approach to the Tahtalı-Seferihisar Sub-Basin located in Turkey, where it is expected to experience water stress in the future. The hydrological (precipitation, flow, evaporation) data of the water resources that are important for the basin and İzmir (Tahtalı, Seferihisar, Ürkmez, and Kavakdere Dams) were used to predict the availability of water resources in the future using the WEAP (Water Evaluation and Planning System) program, and several possible scenarios for water demands/supplies were analyzed. Under these situations, the water budget balances expected to occur 2050 have been estimated. Basically, seven different scenarios were created to transfer possible future possibilities to the program: Reference Scenario, Best Case Scenario, Worst Case Scenario, Report Consumption Scenario, Return Flow Scenario, Population Projection Scenario and Various Forecast Scenario. The water balances that can be obtained under different conditions in each scenario were calculated and compared with each other.Conference Object Design of an Artificial Destratification System To Control Cyanobacteria Growth in Reservoirs(Iahr-int Assoc Hydro-environment Engineering Research, 2022) Hazar, Oguz; Bahadiroglu, Nisa; Karakaya, Derya; Elci, SebnemThis study aims at designing an artificial destratification system to control cyanobacteria growth in the reservoirs. Previous applications for artificial destratification in reservoirs were based on trial and error on site, where neither the effect of air bubble size and configuration nor the effect of air density in the bubble plume could be investigated. This study seeks for the optimized design. We have tackled this task at four steps. Firstly, we setup an experimental system that mimics a thermally stratified reservoir experiencing hypoxia and oxygenate/mix the water column. We maintain a stable stratification by a novel setup designed for this study enabling to form consistent and desired stratified layers along the water column. Next, we investigate the effects of bubble size, bubble slip velocity and other parameters on destratification efficiency. Nondimensional numbers involving bubble diameter, bubble diffusing area, air rate and stratification rates are used to quantify destratification efficiency for the best design of aeration systems. Then, we simulate the hydrodynamics during the mixing of thermally stratified water columns by air diffusers via a 3-D numerical model. The Eulerian multiphase model and k-. turbulence model are found to be suitable for the purposes of the study. In the final part, the numerical model is validated with the experiments. Based on the error analysis of comparisons of the model and observations, the best configuration of air diffuser is proposed, and the numerical model is found to be successful in simulating the destratification of thermally stratified water columns by air diffuser.Article Citation - WoS: 7Citation - Scopus: 9Calculation of the Time-Varying Mean Velocity by Different Methods and Determination of the Turbulence Intensities(Academic Journals, 2010) Bombar, Gökçen; Güney, Mehmet Şükrü; Tayfur, Gökmen; Elçi, ŞebnemThe raw velocity data for both stream-wise and transversal directions in unsteady flows, which are formed by generating input hydrograph, are obtained by using a flow tracker. The same hydrograph is generated 15 times and the mean values are found by calculating the average of all hydrographs. The time varying mean is obtained by using FFT, moving average, wavelet and EMD methods. The best time varying mean is selected according to prescribed criteria. Then, the 15 time series are processed and the stream-wise and transversal turbulence intensities are obtained. The mean of the product of fluctuations is also determined. © 2010 Academic Journals.Conference Object Assessment of Sediment Capture Performances of Coanda and Tyrolean Intakes by Experiments(International Association for Hydro-Environment Engineering and Research, 2019) Elçi,S.; Hazar,O.Intake structures on channels or in reservoirs are frequently used to divert/withdraw a certain amount of water discharge for various purposes of use such as irrigation, potable water supply and generation of hydroelectric power. Hydrologic, geotechnical, topographic and climatic factors directly affect the type of the intake structures which will be constructed. Factors such as excessive rain or snow melt and greater river bed slope which can be cause of high flow rate make impossible to use of the frontal and lateral intake structures. When water has to be diverted from a turbid source having great amount of suspended materials in it, bottom intakes structure such as Coanda and Tyrolean types are preferred. To perform this task, diverted water is captured by a transversal rack and a gallery located in the control crest is utilized. With a proper design of the intake, the quality of the diverted water can be increased by screening out most of the sediments in the flow. Previous studies on the bottom intake structures, presented empirical equations based on experiments relating the diverted water amount per unit width to hydraulic head, discharge coefficient and void ratio of the bar clearance to the total length. Most studies focused on the discharge coefficient and the parameters affecting this coefficient such as hydraulic and rack characteristics. Presented study focused on the sediment capture performances of these two specific type intake structures though experimental work. A novel sediment feeding system designed specifically for this study is utilized in the experiments. Study results pointed out a new parameter including sediment characteristics, as well as rack and hydraulic characteristics should be considered for a proper design of Tyrolean and Coanda type intakes. © 2019, IAHR.Article Citation - WoS: 1Citation - Scopus: 1Enhancement of Savonius Wind Turbine Performance Through Blade Optimization(Isfahan Univ Technology, 2025) Hazar, O.; Dirgenali, M.; Kacar, K.; Elci, S.The objective of this study is to create an innovative blade design that enhances the power efficiency of the Savonius rotors. This is achieved by optimizing the blade shape of the traditional Savonius rotor using the ANSYS Adjoint solver program. The results of the analysis revealed that the total pressure exerted on the optimized shape was 16 times greater than that of the traditional Savonius rotor. To compare performance metrics, the rotor with the optimized blade structure was numerically modeled alongside the traditional and Banesh-type Savonius rotors using the ANSYS Fluent program. The Dynamic Mesh 6DOF method is used in the model domain in order to simulate rotation of the rotor. The rotors were then analyzed in two different configurations: as a single-stage rotor with a phase angle of 0o, and as a three-stage rotor with a phase angle of 60o between each stage while keeping rotor height constant. The optimized blade rotor with 3 stages demonstrated superior performance with a power coefficient of 0.44, outperforming both the Banesh and traditional Savonius rotors, while also displaying power coefficient values 18.9% and 37.5% higher than the Banesh-type Savonius and traditional Savonius rotors, respectively.