Profile URL: https://hdl.handle.net/20.500.13091/11869
Job Title:Doç. Dr.
Email Address:ayarar@ktun.edu.tr
Main Affiliation:02.02. Department of Civil Engineering
Status: Current Staff
ORCID:
0000-0002-0354-1633
0000-0002-0354-1633Scopus ID:
25959808400
25959808400YÖK Akademik: 81FBD6F0D5DFC4C9
Google Scholar:
U5SqIPIAAAAJ
U5SqIPIAAAAJName Variants:
Yarar, A.
18 results
Scholarly Output Search Results
Now showing 1 - 10 of 18
Article Flow Measurement Around Different Types of Bridge Piers Using Acoustic Doppler Velocimeter (ADV)(Konya Teknik University, 2025-12-01) Kayhanlar, Goknur Elif Yarbasi; Yarar, Alpaslan; Yarbaşı, Göknur ElifThe effective management of water resources is a critical global objective, necessitating the construction of hydraulic structures to mitigate the adverse effects of water and ensure its efficient use. Among these, bridges are prominent engineering solutions. The presence of bridge piers, however, inherently alters the natural flow structure, creating complex hydrodynamic interactions. Consequently, a central challenge in hydraulic engineering is to determine the most suitable pier type and configuration that minimizes these disturbances for a given stream regime. To address this challenge, the present study conducts a systematic investigation through controlled laboratory experiments, comparing bridge piers of varying geometries and sizes under consistent hydraulic conditions. The results demonstrate that both the geometry and configuration of the piers significantly influence the flow structure, even when the net flow passage width is held constant.Publication Investigation of Service Bridge Piers Located on Spillway and Effects on Discharge(2019) Yarar, Alpaslan; Martı, Ali İhsan; Yıldız, Ali; Kocaer, ÖznurThe piers can be placed on the spillway crest to hold the sluice gate for controlling the flow or support a service bridge. In addition, these piers to be placed on spillway body provide air entry to prevent negative pressure on the crest and eliminate the risk of cavitation. However, piers and abutments reduce the flow section area and it may cause increasing in reservoir water level. This contraction in the section varies depending on the thickness of the piers besides shape of the cross section. There are some theoretical methods in literature to calculate reduce in effective length of crest. In this study, experimental studies have been done on circular and square section bridge legs in laboratory environment. The results obtained from the studies showed that there are serious differences between experimental and theoretical calculations.Doctoral Thesis Farklı tipteki köprü ayaklarının akım üzerine etkisinin deneysel ve nümerik olarak incelenmesi(2026) Kayhanlar, Göknur Elif Yarbaşı; Yarar, AlpaslanBridges are not only critical components of transportation networks but also engineering structures that alter the flow regime and can lead to hydraulic problems due to the cross-sectional constriction they create in riverbeds. Flow separation, turbulence, and velocity increases occurring around bridge piers threaten structural safety by causing water level changes and bed scour. In this thesis study, the effects of bridge piers with different configurations on flow velocity are investigated comparatively using experimental and numerical methods. Experimental studies were conducted in a laboratory open channel under four different discharge conditions, maintaining a constant net flow width (Lnet), and velocity data were measured using an Acoustic Doppler Velocimeter (ADV). Computational Fluid Dynamics (CFD) based ANSYS-Fluent software was utilized to support and elaborate on the experimental findings. In addition to experimental and numerical analyses, the backwater rise generated upstream of the bridge piers was theoretically examined using the empirical Yarnell Equation, which is widely used in the literature. Within the scope of the study, four different pier geometries—square, circular, streamlined round-nosed, and round-nosed—were analyzed under a total of 16 model scenarios in different layout arrangements. As a result of the study, it was determined that the ANSYS-Fluent software models open channel flow with high accuracy, and that bridge pier geometry and layout arrangement are influential on the hydraulic performance of the flow.Article Ogee Tipi Yan Savakların Savak Kapasitesinin Deneysel Olarak İncelenmesi(Elsevier Ltd, 2025-12-01) Kula, Halil; Yarar, AlpaslanYan savaklar, kanallardaki taşkınların önüne geçebilmek amacıyla fazla suyun yan kanallarla deşarj edilmesi, suyun belli bir miktarının başka bir yere yönlendirilmesi, ana kanallardaki suyun seviyesinin ve debinin kontrol edilmesi amacıyla ana kanala paralel veya belirli açılarla yerleştirilen yapılardır. Ogee tipi savak yapıları biriktirme yapılarının en önemli kısımları arasındadır. Herhangi bir olası taşkın durumunda yapının güvenliğini sağlamak, taşkın sularını kontrollü veya kontrolsüz bir şekilde aktarabilmek için savak yapıları gereklidir. Bu çalışmada biriktirme yapılarının güvenliğini sağlamak için dolusavak olarak kullanılan Ogee tipi savakların yan savak olarak kullanılması durumunda savaklama kapasitesinin deneysel olarak araştırılması amaçlanmıştır. Ayrıca Ogee profiline sahip yan savak için bir debi katsayısı denklemi elde edilmiş ve bu denklem sonucunda hesaplanan değerler ile ölçüm sonuçları karşılaştırılarak denklemin geçerliliği irdelenmiştir. Elde edilen sonuçlara göre Ogee tipi yan savakların keskin kenarlı savaklara göre daha iyi bir savaklama performansına sahip olduğu ve elde edilen savak katsayısı ile savaklanan debilerin hesabının oldukça güvenilir sonuçlar verdiği görülmüştür.Article Modeling of Broad Crested Weirs by Using Dynamic Similarity and Cfd(2020-10-14) Yıldız, Ali; Yarbaşı, Elif Göknur; Yarar, Alpaslan; Martı, Ali İhsanBroad crested weirs and steps are used to regulate the flow in the channel, increase the water level at the upstream side, and measure the discharge. The construction of the broad crested weirs is more practical and also they are more stable compared with the other types of weirs. To serve in accordance with the purpose of their construction, broad crested weirs should be designed and built by considering certain criteria. Before the hydraulic structures are built, model experimental setups are constructed in the laboratory and problems to be encountered are tried to be determined. However, there may be differences between the structure to be built in real life (prototype) and model due to scale effect. These possible differences must be determined and necessary measures must be taken. In this study, the model and prototype of the broad crested weir are constructed in two different open channel systems by using Froude similarity. The geometric similarity between model and prototype is determined as Lr = 4. 44 experimental data were collected from model and prototype. The results obtained from the model and prototype are compared according to hydraulic similarity rules. In addition to the physical experimental setups, numerical models were created using the ANSYS Fluent for the model and prototype separately. By comparing the numerical model and physical experimental setups, optimum mesh size is tried to be determined. According to the results obtained from experimental setups, differences were observed in the position of critical flow depths and downstream water levels due to scale effects.Article Experimental and Numerical Modeling of Bridge Piers Having a Different Numbers of Axis(2023) Kayhanlar, Göknur Elif Yarbaşi; Yarar, AlpaslanThe interaction of bridge piers and currents with each other is mutual. As a result of this interaction, it has been determined that one of the main causes of damage to bridges is the scouring of bridge piers. One of the factors on which the scouring procedure depends is the flow velocity. For this reason, in this study, the velocity distributions that occur before the bridge piers, which are positioned as single axis and double axis, were examined physically and numerically. In experimental studies, the reading values obtained by using ADV were compared with the results obtained from the ANSYS-Fluent package program used in numerical modeling. The performance of the model used and the effects of placing the piers as single axis and double axis were evaluated. As a result of the study, it was determined that the ANSYS used in determining the flow velocity area was very compatible with the experimental results and that the flow velocity acting in the system obtained by placing the bridge piers as a single axis is larger.Article Experimental and Numerical Modeling of Head Over Broad Crested Weirs(Konya Technical University, 2020) Yıldız, Murat Can; Yarar, AlpaslanThe cross section of an open channel is closed by a barrier, in order to measure and control to the flow. Weirs are one of the hydraulic structures, constructed fort his aim. Flow pass over the weir to the downstream. Weirs can be classified as sharped crested weirs, broad crested weirs and ogee spillways. Crest width of the broad crested weir is designed according to flow conditions on upstream, so, critical flow can be obtained throughout the crest. In this study, the effect of the broad crested weirs models, having different slopes, on the flow conditions, by experimental. Three different broad crested weirs were made and 41 head were measured for different discharge on each model. Numerical models, having the same conditions with the experimental models, were also done by ANSYS-FLUENT, computational fluid dynamics (CFD) software. Results of the experimental and numerical models were compared and it was seen that the results are consistent with each other.Master Thesis Experimental Investigation of Discharge Capacity of Ogee Side Weirs(2025) Kula, Halil; Yarar, AlpaslanYan savaklar, kanallardaki taşkınların önüne geçebilmek amacıyla fazla suyun yan kanallarla deşarj edilmesi, suyun belli bir miktarının başka bir yere yönlendirilmesi, ana kanallardaki suyun seviyesinin ve debinin kontrol edilmesi amacıyla ana kanala paralel veya belirli açılarla yerleştirilen yapılardır. Ogee tipi savak yapıları biriktirme yapılarının en önemli kısımları arasındadır. Herhangi bir olası taşkın durumunda yapının güvenliğini sağlamak, taşkın sularını kontrollü veya kontrolsüz bir şekilde aktarabilmek için savak yapıları gereklidir. Bu çalışmada biriktirme yapılarının güvenliğini sağlamak için dolusavak olarak kullanılan Ogee tipi savakların yan savak olarak kullanılması durumunda savaklama kapasitesinin deneysel olarak araştırılması amaçlanmıştır. Ayrıca Ogee profiline sahip yan savak için bir debi katsayısı denklemi elde edilmiş ve bu denklem sonucunda hesaplanan değerler ile ölçüm sonuçları karşılaştırılarak denklemin geçerliliği irdelenmiştir. Elde edilen sonuçlara göre Ogee tipi yan savakların keskin kenarlı savaklara göre daha iyi bir savaklama performansına sahip olduğu ve elde edilen savak katsayısı ile savaklanan debilerin hesabının oldukça güvenilir sonuçlar verdiği görülmüştür.Article Determination of Position of Hydraulic Jump in a Flume by Using Cfd and Comparison With Experiential Results(2020) Yıldız, Ali; Martı, Ali İhsan; Yarar, Alpaslan; Yılmaz, VolkanDams and hydraulic structures are used for the supply and control of water, which have great importance on human life. The sluice gate is one of the hydraulic control structures. Sluice gates release excess water from the reservoir to the downstream side in a controlled manner with a certain discharge for controlling the level of the reservoir. A hydraulic jump is created to dissipate the energy of flow coming from under the gates. A hydraulic jump occurs when the flow regime is changed from subcritical to supercritical. However, the position of the hydraulic jump in the channel should be known exactly to prevent damage to surrounding structures. In this study, an open channel system with a sluice gate is used to produce a hydraulic jump. Experiments are conducted for two different gate openings (a1=1.5 cm and a2=2 cm) and 16 discharge values. For each case, the position of the hydraulic jump is determined. In addition, flow depths at 5 different points were measured including before and after the hydraulic jump. The results obtained from the experimental study were compared with the numerical model in terms of the position of hydraulic jump and flow depths. According to the results obtained, the numerical model and the physical model showed between 80 and 91% consistency.Master Thesis Ogee Tipi Dolu Savaklar Üzerindeki Akımların Deneysel ve Nümerik Modellenmesi(Konya Teknik Üniversitesi, 2019) Kocaer, Öznur; Yarar, AlpaslanOgee tipi dolusavak, fonksiyonel uygunluğu ve yüksek güvenlik faktörü nedeniyle en çok tercih edilen savak tiplerinden biridir. Rezervuardaki debilerin ve su seviyelerinin kontrol edilmesi için acil durumlarda su seviyesinin düşürülmesi, normal nehir fonksiyonlarının sürdürülmesi ve fazla suyun tahliyesi gibi birçok kullanımı vardır. Bu çalışmanın temel amacı, ogee tipi dolusavağın laboratuvar ortamlarında açık kanal içinde deneyleri yapılarak üzerindeki akışın araştırılması ve sayısal model ile simüle edilmesidir. Fiziksel modelin birebir aynı boyutlardaki sayısal modeli açık kaynak kodlu ve ticari paket program olmak üzere iki farklı programla modellenmiştir. Modellerin belirlenen dört noktada akış derinlikleri ölçülmüştür. Sayısal analizde K-? ve K-? SST türbülans modelleri kullanılmıştır. Elde edilen sonuçlara göre, akış derinliklerini ve su yüzey profillerini simüle etmek için sayısal araçların yeterince gelişmiş olduğu kanıtlanmıştır.
Research Topics
Domains
Physical Sciences
Fields
EngineeringEnvironmental Science
Subfields
Civil and Structural EngineeringEcologyWater Science and TechnologyEnvironmental EngineeringGlobal and Planetary Change
Specific Research Areas
Hydraulic flow and structures
Hydrology and Sediment Transport Processes
Hydrology and Watershed Management Studies
Hydrological Forecasting Using AI
Flood Risk Assessment and Management
Sustainable Development Goals
11SUSTAINABLE CITIES AND COMMUNITIES
3
Research Products
6CLEAN WATER AND SANITATION
2
Research Products
Documents
12
Citations
200
h-index
5
This researcher does not have a WoS ID.
Publication Collaboration
| Affiliation Name | Count |
|---|---|
| Selçuk University | 9 |
| Konya Technical University | 9 |
| Necmettin Erbakan University | 2 |
| Bartin University | 1 |
| Konya Food and Agriculture University | 1 |
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Data obtained from OpenAlex
| Journal | Count |
|---|---|
| Romanian Journal of Ecology & Environmental Chemistry | 3 |
| Flow Measurement and Instrumentation | 1 |
| International Symposium The Environmental and The Industry | 1 |
| Journal of Computational Applied Mechanics | 1 |
| Konya Journal of Engineering Sciences | 1 |
Current Page: 1 / 2
Scholarly Output
18
Articles
10
Views / Downloads
36/116
Supervised MSc Theses
3
Supervised PhD Theses
1
WoS Citation Count
20
Scopus Citation Count
34
Patents
0
Projects
0
WoS Citations per Publication
1.11
Scopus Citations per Publication
1.89
Open Access Source
13
Supervised Theses
4
Scopus Quartile Distribution
Competency Cloud
