Bor Türkben, Aslı
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TURKBEN, Asli BOR
Türkben, Aslı Bor
Bor,Asli
Bor Turkben, Asli
Turkben, A. Bor
Bor,A.
Bor, Aslı
Türkben, Aslı Bor
Bor,Asli
Bor Turkben, Asli
Turkben, A. Bor
Bor,A.
Bor, Aslı
Job Title
Email Address
asli.turkben@ieu.edu.tr
Main Affiliation
05.03. Civil Engineering
Status
Current Staff
Website
ORCID ID
Scopus Author ID
Turkish CoHE Profile ID
Google Scholar ID
WoS Researcher ID
Sustainable Development Goals
5
GENDER EQUALITY
0
Research Products
9
INDUSTRY, INNOVATION AND INFRASTRUCTURE
1
Research Products
13
CLIMATE ACTION
2
Research Products
8
DECENT WORK AND ECONOMIC GROWTH
2
Research Products
14
LIFE BELOW WATER
0
Research Products
17
PARTNERSHIPS FOR THE GOALS
0
Research Products
1
NO POVERTY
0
Research Products
2
ZERO HUNGER
0
Research Products
4
QUALITY EDUCATION
0
Research Products
11
SUSTAINABLE CITIES AND COMMUNITIES
1
Research Products
16
PEACE, JUSTICE AND STRONG INSTITUTIONS
0
Research Products
3
GOOD HEALTH AND WELL-BEING
0
Research Products
6
CLEAN WATER AND SANITATION
2
Research Products
12
RESPONSIBLE CONSUMPTION AND PRODUCTION
2
Research Products
10
REDUCED INEQUALITIES
0
Research Products
15
LIFE ON LAND
0
Research Products
7
AFFORDABLE AND CLEAN ENERGY
2
Research Products
Documents
20
Citations
152
h-index
6
Documents
21
Citations
144
Scholarly Output
21
Articles
15
Views / Downloads
7/604
Supervised MSc Theses
1
Supervised PhD Theses
0
WoS Citation Count
61
Scopus Citation Count
80
WoS h-index
5
Scopus h-index
6
Patents
0
Projects
2
WoS Citations per Publication
2.90
Scopus Citations per Publication
3.81
Open Access Source
12
Supervised Theses
1
| Journal | Count |
|---|---|
| Water | 5 |
| Proceedings of the IAHR World Congress | 2 |
| Canadıan Journal of Cıvıl Engıneerıng | 1 |
| Dokuz Eylül Üniversitesi Mühendislik Fakültesi Fen ve Mühendislik Dergisi | 1 |
| Energies | 1 |
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21 results
Scholarly Output Search Results
Now showing 1 - 10 of 21
Article Citation - Scopus: 1Exploring Hydrological Response To Land Use/Land Cover Change Using the SWAT Plus Model in the İznik Lake Watershed, Türkiye(MDPI, 2025) Tezel, Anil Caliskan; Akpinar, Adem; Bor,Asli; Alfredsen, Knut ToreLand use/land cover (LULC) changes significantly affect hydrological processes in watersheds. In this study, the Soil and Water Assessment Tool (SWAT+) model was employed to investigate the hydrological response to LULC changes in the & Idot;znik Lake Watershed, a region of significant environmental and social importance in the Marmara Region of T & uuml;rkiye. This study provides a novel understanding of water balance dynamics of the & Idot;znik Lake Watershed through hydrological modeling. The SWAT+ model was calibrated and validated against observed monthly flow data from two gauging stations using three objective functions: Nash-Sutcliffe efficiency (NSE), Kling-Gupta efficiency (KGE), and the percent bias (PBIAS). The model was utilized to evaluate the impacts of LULC change on water balance components such as surface runoff, percolation, lateral flow, water yield, and evapotranspiration. The results revealed that the expansion of urban areas and reduction in forest land have led to an increase in surface runoff and a decrease in lateral flow and percolation, which in turn have impacted the overall water yield of the watershed. The findings of this study can inform land use planning and management decisions to mitigate the negative impacts of LULC changes on water resources in the & Idot;znik Lake Watershed and similar regions.Article Citation - WoS: 4Citation - Scopus: 5Experimental Investigation of 90 Degrees Intake Flow Patterns With and Without Submerged Vanes Under Sediment Feeding Conditions(Canadian Science Publishing, 2022) Bor Türkben, AslıIn this study, two experiments were conducted ina 90 degrees water intake to study 3D flow patterns and sediment distribution using submerged vanes under sediment feeding and live-bed conditions. One column three vanes were installed at a 20 degrees angle maintaining for a water discharge ratio of qr = 0.1. Three-dimensional mean and turbulent velocity components of flow ina 90 degrees channel intake were measured using acoustic Doppler velocimetry (ADV). Flow characteristics of the intake structure area with no vanes were compared with these conditions. Results showed that three vanes with a single column reduced the amount of sediment by 20% during intake diversion. In the downstream corner of the intake, high velocities were measured where scouring occurred. The vanes affected the intensity of secondary flow, turbulence energy, flow separation, and moved sediment deposition downstream of the main channel.Article Citation - WoS: 3Citation - Scopus: 4Experimental and Numerical Investigation of Local Scour Around Square Bridge Pier(Taylors Univ Sdn Bhd, 2022) Bor Türkben, Aslı; Güney, Mehmet ŞükrüThis study examines, local scour around square pier under unsteady flow conditions, caused by five different hydrographs. The experiments were conducted in the rectangular flume of 18.6 m length, 0.80 m width and 0.75 m depth, with uniform sediment bed material D-50 = 1.68 mm. Five experiment series were conducted with a plexiglass square pier b = 8.5 cm. The unsteady flow was generated by means of triangular hydrographs. The temporal variations of the equilibrium scour depths in front of the pier and the scour hole dimensions were recorded by two different cameras. The equilibrium scour depths at lateral sides and downstream of the pier were also measured. The hydrograph peak flow rates were found to be much more effective compared to hydrograph durations. The numerical solution was realized by using the software ANSYS FLUENT with RNG k-epsilon turbulence model. The numerical and experimental values were compared and interpreted, and acceptable accordance was observed between them. The calculated lengths and widths of the scour hole were found close to the measured ones. A comparison of the final elevations (t = 15 min.) for experimental and numerical results revealed that; the values of RMSE, MAE errors, and the determination coefficient R-2 were 0.53 cm, 0.48 cm, and 0.94 respectively. The R-2 values are 0.98 and 0.95 for the measured and calculated scour hole length (L) and width (W), respectively.Article Denizli Buldan Barajı Sarıgöl Sulaması İsale Hattı Su Darbesi Analizleri(2021) Bor Türkben, AslıSulama iletim hatlarında, suyun aniden açılması veya aniden kesilmesi durumları hat içerisinde anibasınç değişimlerine neden olabilir. Su darbesi denilen bu olay, akışkan koşullarınınmomentumundaki ani değişiklikler veya değişikliklerle ilişkili olarak iletim hattındaki basınçdalgalarının üretilmesini, yayılmasını ve yansımasını tanımlar. İletim hattındaki kontrolsüz bir sudarbesi hattın hasar görmesine neden olabilir, ekipmanlara zarar verebilir ve hatta can kaybına nedenolabilir. Hatların proje aşamasında su darbesinin modellenmesi ve gerekli önlemlerin alınmasıönemlidir. Bu çalışma kapsamında, Denizli Buldan Barajı Sarıgöl Sulaması İsale hattının su darbesianalizleri yapılmıştır. Buldan barajı ile regülatör arasındaki yaklaşık 3400 m’lik iletim kısmı, 2740 ha(brüt), 1870 ha (net) saha alanına sulama hizmeti verecek olan Sarıgöl isale hattı, yoğun olarakmansap deresine karışan sediment ve bunun sonucunda sulamayı olumsuz olarak etkilemesinedeniyle kapalı borulu olarak yapılması tasarlanmıştır. Bu amaçla, basınçlı sistemlerde yaygın olarakkullanılan karakteristikler metodu adı verilen matematiksel yöntem kullanılarak, zamanla değişenakım şartları altında analizler yapılmıştır. Su darbesini kütle korunum diferansiyel denklemlerininkarakteristik metodu için oluşturulan algoritmayı içeren bilgisayar kodu yazılmıştır. Bu programkullanılarak, bir rezervuar boru vana için su darbesi analizi yapılmıştır ve iletim hattının, su darbelerinedeniyle meydana gelen basınç değişimleri hesaplanmıştır. Bu analizler sonucunda hattayerleştirilmesi gereken enerji kırıcı vanaların yerleri ve vana kapanma süreleri önerilmiştir.Article Citation - WoS: 3Citation - Scopus: 3Investigation of Improved Energy Dissipation in Stepped Spillways Applying Bubble Image Velocimetry(MDPI, 2024) Mikalsen, Lars Marius; Thorsen, Kasper Haugaard; Bor, Asli; Lia, LeifThis study investigates skimming flow regimes, two-phase air-water flow conditions, and simple measures to improve energy dissipation in stepped spillways. Experiments were conducted using two different scale physical models, 1:50 and 1:17, within separate rectangular flumes to define scale effects. Flow patterns were analyzed using the Bubble Image Velocimetry (BIV) technique, which tracks air bubbles. The introduction of splitters resulted in a 7% increase in relative energy dissipation. Additionally, the length of inception was reduced to Li/ks = 10, thereby decreasing the potential for subsequent cavitation. Beyond the BIV experiments, two experiments were conducted on the large-scale model using Acoustic Doppler Velocimetry (ADV), with and without splitters, to examine the impact of splitters on the velocity profile above the crest. In the experiment with splitters, the vertical velocity vector (v) contributed to turbulence by changing direction, thereby reducing average velocities both in front of and behind the ogee crest. This led to a reduction in energy on the downstream side of the spillway. Although the small-scale model appears unsuitable for studying two-phase flow, the change in relative energy dissipation from the baseline to the splitter configuration was practically identical for both scale models, thereby supporting the findings of the large-scale model.Conference Object Citation - WoS: 5Citation - Scopus: 6Experimental Study of Submerged Vanes in Intakes Under Sediment Feeding Conditions(E D P Sciences, 2018) Bor Türkben, AslıSediment is transported along the river flow and deposited in the mouth of the intake structure over time and reducing the water intake capacity. Nowadays, many water intake structures lose their function and are closed to operation. To deal with this problem, recently, submerged vane application has offered a practical and economical solution. The aim of this study was to evaluate the efficiency of three vane installations under sediment feeding conditions by comparing the bed topography before and after vanes were installed. For that purpose, experiments were carried out in a laboratory channel running for 90-degree intake angle. Three vanes were installed in one column at near the intake entrance. The vanes dimensions were equal to; 3cm height, 12cm long, 10 mm thick, and aligned with alpha = 20 angle to flow direction. The tests were run until equilibrium was reached, i.e. when the outgoing solid discharge was equal or larger than 90% of the incoming. Once the bed topography remained stable, bed and water level surfaces were measured. tests were carried out by feeding sediment from upstream of the main channel.Conference Object Citation - Scopus: 1Application of Artificial Neural Network for Predicting Peak Discharge from Breached Embankment Dam(International Association for Hydro-Environment Engineering and Research (IAHR), 2024) Okan, M.; Bor, A.; Tayfur, G.Estimation of peak discharge is a key parameter for risk assessment in case of dam failure, and has attracted great attention from researchers in recent years. Many formulas are available in the literature, but these cannot cover all experimental scenarios. Existing models are typically inadequate to address the complexities of dam breaches. This research attempted to predict the peak discharge in the breached embankments with an artificial neural network (ANN) model, which is effective in nonlinear problems, using datasets obtained from various dam breaches cited in the literature. The ANN model is useful in the preparation of emergency action plans since it enables prediction of peak discharge. Multilayer Perceptron (MLP) with Levenberg-Marquardt (LM) and Bayesian Regularization (BR) algorithms was used to predict peak discharges from breached embankments. The dataset was divided into three: 56% for training, 20% for validation and 24% for testing. Different scenarios were created using different input combinations. Performance evaluation was based on the root-mean squared error (RMSE), percent bias (PBIAS), determination of coefficient (R2), Nash-Sutcliffe efficiency (NSE) and RMSE-observations standard deviation ratio (RSR). A comparison of training algorithms revealed that LM showed the best performance when the best ANN was selected from 1000 networks. Volume of water above the breach bottom (Vw) had a greater effect on model performance than the depth of water above the breach bottom (Hw). The best performance was obtained when both Vw and Hw were used as input. © 2024 ISHS. All Rights Reserved.Article Citation - WoS: 4Destratification of Thermally Stratified Water Columns by Air Diffusers(Elsevier, 2023) Elci, Sebnem; Hazar, Oguz; Bahadiroglu, Nisa; Karakaya, Derya; Bor Türkben, 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-omega 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.Article Citation - WoS: 9Citation - Scopus: 13Numerical Analysis of Three Vertical Axis Turbine Designs for Improved Water Energy Efficiency(MDPI, 2024) Karakaya, Derya; Bor Türkben, Aslı; Elçi, SebnemA hydrokinetic turbine with a vertical axis is specifically designed to harvest the kinetic energy from moving water. In this study, three vertical axis water turbines, namely Gorlov, Darrieus, and Savonius turbines, were compared for their efficiency via numerical modeling for steady-state conditions via the ANSYS 2022 R2 Fluent model. The Semi-Implicit Method for Pressure-Linked Equations (SIMPLE) was implemented with an SST k-omega turbulence model. The dynamic mesh technique, which allows modeling according to changes in angular velocity at each time step, was used to simulate flow around the turbines for six different velocities (from 0.5 to 3 m/s). The efficiency of the turbines was compared and the results were analyzed. The pressure, velocity, and turbulence kinetic energy distributions around the rotor were measured at different rotational angles and results indicated a wider operating range for the Darrieus and Gorlov turbines compared to the Savonius turbine. The highest power coefficient of 0.293 was achieved in the model featuring a Darrieus turbine, corresponding to a TSR value of 1.34, compared to 0.208 for the Gorlov and 0.257 for the Savonius turbine, at TSR values of 1.3 and 1.06, respectively. Numerical modeling results pointed to a significantly higher self-starting capacity for the Savonius turbine compared to the others.Article Citation - WoS: 1Citation - Scopus: 6Investigation of the Hydroelectric Development Potential of Nonpowered Dams: a Case Study of the Buyuk Menderes River Basin(Mdpi, 2023) Okang, Quentin Adjetey; Bakken, Tor Haakon; Bor Türkben, AslıThe adaptation of nonpowered dams (NPDs) to dams with hydroelectric generation units requires only minor interventions compared with the construction of a completely new dam and power plant. Thus, it is both more economical and has a minimal environmental impact, especially during construction. The aim of this study was to determine the environmental, technical, and economic feasibility of hydroelectric retrofitting projects in the Buyuk Menderes basin in Turkey. For this purpose, the economic feasibility and retrofitting potential of 11 NPDs in the basin were investigated using Water Evaluation and Planning (WEAP) software. The results from the energy simulation revealed that the annual average hydropower generation potential and installed capacity for the selected 11 NPDs are 38.7 GWh/year and 4.4 MW, respectively. The total estimated capital investment cost of the 11 retrofit projects was found to be $7.9 million with a total NPV of $25.6 million. In addition, in this study, the leveled electricity cost for each retrofitting project was established and compared with the LCOE values of other renewable energy sources. The findings show that retrofitting NPDs may represent an as yet untapped opportunity to support the global energy transition by providing a cheaper and more environmentally friendly option to pioneer rural electrification.
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