Güney, Mehmet Şükrü
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Guney, M. Sukru
Guney, Mehmet Sukru
Guney, M. S.
Guney, Mehmet Sukru
Guney, M. S.
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sukru.guney@ieu.edu.tr
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05.03. Civil Engineering
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| Journal | Count |
|---|---|
| Dokuz Eylül Üniversitesi Mühendislik Fakültesi Fen ve Mühendislik Dergisi | 2 |
| Turkish Journal of Civil Engineering | 2 |
| Bulletin of Engineering Geology and the Environment | 1 |
| Cıvıl Engıneerıng Journal-Tehran | 1 |
| Dicle Üniversitesi Mühendislik Fakültesi Mühendislik Dergisi | 1 |
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Article Barajın Kısmi ve Ani Yıkılması Durumlarında Oluşan Taşkın Dalgalarının Çarpıtılmış Fiziksel Model ile Deneysel Olarak Araştırılması(2020) Arkış, Tanıl; Güney, Mehmet ŞükrüBarajlar su temini, sulama, enerji üretimi ve taşkın kontrolü gibi faydalı işlevleri olan önemli suyapılarıdır. Çok büyük can ve mal kaybına sebep olan baraj yıkılması deneysel ve sayısal olarak uzunyıllardan beri araştırılmaktadır. Barajın yıkılması durumunda oluşan taşkın dalgalarının yayılmasıDokuz Eylül Üniversitesi Hidrolik Laboratuvarı açık alanında inşa edilmiş olan Ürkmez Barajı vemansap bölgesinin çarpıtılmış fiziksel modeli yardımıyla deneysel olarak araştırılmıştır. Model ilkyazarın burslu doktora öğrencisi olarak görev aldığı TÜBİTAK 110M240 nolu proje kapsamındatasarlanmış ve inşa edilmiştir. Yatay ölçeği 1/150 ve düşey ölçeği 1/30 olan bu fiziksel model barajgölünü ve baraj mansabında denize kadar olan yerleşim yerini de içermektedir. Modelin geometrikparametreleri mevcut haritalar ve benzeşim kanunları kullanılarak belirlenmiştir. Bu bağlamda 300m2’lik alanda inşa edilmiş olan modelde baraj gölü yaklaşık olarak 11 m3, baraj uzunluğu 2,84 m veyüksekliği 1,07 m’dir. Ürkmez Barajı fiziksel model için makul boyutlara sahip olduğu ve yerleşimyerine yakın olduğu için seçilmiştir. Evler ve karayolu gibi hususlar da modelde yerleştirilmiştir. Suderinlikleri e+ WATER L seviye ölçerleri kullanılarak ölçülmüştür. Hızlar Ultrasonic Velocity Profiler(UVP) algılayıcıları ile belirlenmiştir. Taşkın dalgasının yayılması kamera vasıtasıyla kaydedilmiştir.Elde edilen deneysel bulgular değerlendirilmekte ve bunların prototipte karşılık gelen değerleriyorumlanmaktadır.Article Citation - WoS: 4Citation - Scopus: 4Experimental Investigation of Scour Hole Characteristics for Different Shapes of Piers Caused by Flood Hydrograph Succeeding Steady Flow(Turkish Chamber Civil Engineers, 2021) Güney, Mehmet ŞükrüIn this study, the scour depth and dimensions of the scour hole around different shaped piers for the cases of hydrographs succeeding steady flow were studied experimentally. The experiments were carried out by using circular, square, rectangular, lenticular and rectangular with trapezoidal nose to compare the various scour hole geometries at the same flow conditions. Numerous experiments were conducted in a rectangular flume (18.6 m long, 0.80 m wide and 0.75 m deep) with different triangular shaped hydrographs. The flume bed of 26 cm thickness consists of uniform graded material with D-50 = 1.68 mm. The experiments were carried out in clear water conditions. 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 piers were also measured. Regression analysis was performed in order to derive empirical relations to predict temporal variations of the scour depth in the case of unsteady flow. The shape factor values were also investigated based on the experimental findings and the obtained values were compared to those available in literature. The performance of the obtained empirical relation for circular pier was tested by using limited experimental data available in the literature. The smallest scour hole was observed for the rectangular with trapezoidal noses pier. The increase in the scour hole dimensions for other cross-sections was in the following order: rectangular with circular noses, circular, square and rectangular piers.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 Experimental Investigation of the Partial Vegetation Effect on the Flood Wave Propagation Resulted From Dam Failure in Urkmez Residential Area by Means of Distorted Physical Model(2021) Güney, Mehmet Şükrü; Sevinç, EmrahThe purpose of this study is to investigate the effect of partial vegetation on the wave propagationresulted from sudden dam failure in a residential area. Temporal variations of water depths and floodwave propagation velocities were determined and compared with those obtained from theexperiments performed without vegetation. The experiments were performed on the distortedphysical model of Urkmez Dam and its downstream region. The distorted physical model withhorizontal scale of 1/150 and vertical scale of 1/30 contains the dam reservoir, the dam body, theresidential area of Urkmez coastal town until the sea and the partial vegetation. In the model, thereservoir has an active volume of 11.222 m3, the dam body has a length of 2.84 m and a height of 1.07m, and the downstream area is nearly 200 m2. Water depths were measured by e+ WATER L levelsensors placed at various locations of the downstream region. Velocities were measured by ultrasonicvelocity profilers (UVP) located near the level sensors. Flood wave propagation was recorded by thehigh definition digital camera. Experimental findings obtained from the physical model wereconverted to the prototype values, in nature. The changes in water depths and elapsed times, also thechanges in velocities and their occurrence times were determined for different zones of thedownstream area in the presence of vegetation. The experimental results revealed that in such a damfailure, the flood arrives at the sea in 6 s in the absence of vegetation, while in 10 s in the presence ofvegetation. These values correspond to 2.74 min and 4.57 min, respectively in the prototype. Theexistence of vegetation resulted in decrease in flood propagation velocities mainly in the denseresidential area, as expected. It was observed that the maximum water depths were increased at theleft bank and decreased at the right bank, except at level sensor S6 which is very close to the creek. Itwas observed that the maximum depth averaged velocities were decreased in the sparse and denseresidential areas. The existence of the vegetation changed considerably the local velocities duringrising and recession stages of the water depth. It was found that the order of magnitude of theprototype velocities was high and such velocities can cause serious damage mainly in the buildingsclose to the dam body. Because the presence of vegetation caused a decrease in flood propagationvelocities in the sparse and dense residential areas, it would reduce the damages on the buildings inthese areas.Article Temiz Su Koşulları Altında Dairesel Köprü Ayaklarının Etrafındaki Nihai Oyulma Derinliklerinin Deneysel Araştırılması(2019) Güney, Mehmet Şükrü; Gümgüm, Fırat; Aksoy, Ayşegül Ö.Bu deneysel çalışmada, TÜBİTAK 109M637 projesi kapsamında inşa edilen hareketli tabanlı doğrusal kanaldakararlı akım şartlarında dairesel kesitli köprü ayakları etrafındaki nihai temiz su oyulması incelenmiştir. Deneyselçalışmada 4 farklı boyutlu dairesel köprü ayağı ve 3,47 mm ortalama tane çapına sahip üniform taban malzemesikullanılmıştır. Ultrasonik hız profilleyicisi yardımıyla ölçülen oyulma derinlikleri, literatürdeki mevcutbağıntılardan elde edilen oyulma derinlikleri ile karşılaştırılmış ve oyulma derinliği ile ilişkili bazı parametrelerinoyulma derinliğine olan etkisi incelenmiştir. Çeşitli regresyon analizleri sonucu nihai temiz su oyulma derinliğinitahmin eden bir bağıntı önerilmiş ve istatistiksel olarak anlamlı parametreler elde edilmiştir. En yüksek oyulmaderinliğinin ayağın memba bölgesinde meydana geldiği gözlenmiştir. Akım şiddeti, yoğunluk farkı esaslı daneFroude sayısı ve köprü ayak çapı arttıkça oyulma derinliğinin arttığı tespit edilmiştir.Article Citation - WoS: 6Citation - Scopus: 5Experimental and Numerical Investigation of the Flood Waves Due To Partial Dam Break(Springer Int Publ Ag, 2022) Aksoy, Aysegul Ozgenc; Dogan, Mustafa; Guven, Semire Oguzhan; Tanir, Gorkem; Guney, Mehmet SukruThe potential destruction of dams is a serious danger for the settlements. Dam break events cause serious loss of life and property in the region, regardless of the reason. The time required to give warn the people of the region is very short since floods develop suddenly during dam breaks. For this reason, the investigation of the flood wave propagation that will occur at the time of possible collapse is important for the emergency action plans to be prepared. In this study, the dam break experiments were carried out in the distorted physical model of the Urkmez Dam and at its downstream part also involving the vegetation. The horizontal and vertical scales are 1/150 and 1/30, respectively. The water depths and local velocities were measured by means of elaborated devices, and the propagation of the flood wave was recorded by high-precision cameras. In addition, numerical analysis was achieved by using the FLOW-3D program. According to the results, it is concluded that as the water level decreases, the time to reach the measurement points of the flood increases and the spatial distribution is delayed. The computed values obtained from the numerical model simulated by using the dam reservoir are in better agreement with those obtained from experiments than those calculated by using the outlet hydrograph.Article Citation - WoS: 3Citation - Scopus: 3Effect of Sediment Feeding on Live-Bed Scour Around Circular Bridge Piers(C Ej Publishing Group, 2021) Gumgum, Firat; Guney, Mehmet SukruThe effect of sediment feeding was investigated in the case of live-bed scour around circular bridge piers under flood waves to provide contributions for future experimental procedures. Circular piers of three different diameters were tested in a long rectangular flume containing uniform sediment layer 25 cm thick, by generating 7 different triangular hydrographs with different durations ranging between 6 and 20 minutes and the peak discharges varying from 18 L/s to 38 L/s. Experiments were first conducted without sediment feeding and total load was collected at predetermined time intervals. Then the same experiments were performed by feeding with the same amount of collected sediment. Time dependent scour depths were measured using UVP. Bed degradation was also determined by using an empirical equation existing in the literature. It was found that feeding with the rates equal to the transported ones did not significantly change the scour depth and total sediment load within the limits of the experiments. No significant bed degradation was observed, except at the upstream end. It was revealed that the sediment feeding may not be required in the experiments where temporal evolution of the scour depth is studied in a sufficiently long flume containing sufficient sediment.Article Citation - WoS: 17Citation - Scopus: 17Experimental Investigation of the Equilibrium Scour Depth Below Submerged Pipes Both in Live-Bed and Clear-Water Regimes Under the Wave Effect(Elsevier Sci Ltd, 2018) Dogan, Mustafa; Aksoy, Aysegul Ozgenc; Arisoy, Yalcin; Guney, Mehmet Sukru; Abdi, VahidPipelines are the key structures to carry fluids such as oil, petroleum, gas and water; any inadequate design induces bottom stability problems causing unintended consequences. In the present study, the equilibrium scour depth below submerged pipes due to regular waves was investigated experimentally. During the experiments various pipe diameters, bed material grain sizes and wave characteristics were used. The novelty of the study is that the experiments were performed both in live-bed and clear-water regime conditions. The analysis of the experimental data showed that the equilibrium scour was correlated with Shields parameter as well as Keulegan-Carpenter number, especially for live-bed scour condition. However, in the case of clear-water scour, the Keulegan-Carpenter number was found as a unique non-dimensional parameter that dominates the scour phenomenon. New empirical relations were also proposed for clear-water and live-bed scour separately.Article Numerical Study of Breaching at Upper Parts of Homogenous Earthen Dams(Springer Heidelberg, 2025) Dumlu, Emre; Guney, Mehmet Sukru; Okan, Merve; Ozden, Guerkan; Tayfur, GokmenIn this study, time-dependent finite element analyses of the breaching process in two homogenous earth-fill dams were performed using the finite element method. Breaching was initiated at the middle and corner sections of the upper part of the dam bodies. The numerical results were compared with the findings of the experiments realized on dams 60 cm high, 2 m wide at bottom, 20 cm wide at crest with 1 V:1.5H side slopes at upstream and downstream faces. This numerical study combines time-dependent hydraulic gradient distributions and groundwater flows to assess breach areas, velocities, and flow rates. A Python algorithm was integrated with the Jupyter console, allowing the simulation of the breach mechanism in multiple runs to determine breach parameters. Both numerical and experimental analyses revealed that the dams were exposed to backward erosion, starting at the downstream side of the dam and progressing inward. The compatibility between experimental and numerical results was sought by means of the parameters RMSE, MAE and the statistical performance of the numerical approach was evaluated by using RSR, NSE, and PBIAS. A fairly good agreement was obtained between the experimental and numerical results.Conference Object Comparison of the Evolutions of Internal Erosion When Seepage Is at Top, Bottom or Middle Part of the Homogeneous Earth-Fill Dam Built With Fine Sand and Clay Mixture(International Association for Hydro-Environment Engineering and Research (IAHR), 2024) Güney, M.S.; Dumlu, E.; Okan, M.; Kalyoncu, Y.One of the most prominent failure reasons for earth-fill dams is internal erosion resulting from piping. This failure mode may cause irreversible weakened structural integrity, loss of properties, and even loss of lives. Therefore, it is important to understand the breaching process due to piping by providing reliable data for the decision-makers in case of emergency. This study was supported by the Scientific and Technological Research Council of Turkey with project number 119M609 and involves experimental investigation on piping under three different weak zone scenarios to examine the breach process and provide the data for more realistic numerical evaluations. The experiments were conducted in the hydraulic laboratory of Izmir University of Economics and Dokuz Eylul University. The initiation of piping was triggered from seepage in weak layers at the bottom, middle, and upper parts, along the centerline of homogenous earth-fill dams in a rectangular flume. As a result of the experiments, the magnitude of the peak discharges and their durations as well as the eroded breach areas were found to be affected by the locations of the seepage and initial water heads acting on the weak zones. Also, in the experiments, at the beginning of the breaching, initial cascading surface flow resulted in sheet and rill erosion. © 2024 ISHS. All Rights Reserved.
