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Mehmet Ali Kokpinar

Mehmet Ali Kokpinar
TEDU · Civil Engineering

Doctor of Engineering

About

19
Publications
13,141
Reads
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280
Citations
Citations since 2016
4 Research Items
163 Citations
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20162017201820192020202120220102030
20162017201820192020202120220102030
20162017201820192020202120220102030
Additional affiliations
January 1997 - January 2016
Independent Researcher
Independent Researcher
Position
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Publications

Publications (19)
Article
A detailed investigation has been conducted to study the shift location of the point of the maximum scour depth for both bridge abutment-collar and pier-collar arrangements. In the present study, an experimental program has been conducted for abutment-collar arrangements and additionally, the data obtained from the literature for the pier-collar ar...
Article
en Discharge measurement and control structures are widely employed in hydraulic engineering applications. The objective of this study is to numerically investigate the modelling of two different structures, namely sharp‐crested weirs as Problem 1 and combined weir and gate systems as Problem 2. The research methodology herein is based on the compa...
Article
This study quantifies the dimensionless maximum scour depth ds/D50 downstream of flip buckets as a function of the square of the densimetric Froude number Frd², jet Reynolds number Re, lip angle, and sediment non-uniformity constant. The proposed formula is valid for Frd = 2.9–29.69, Re = 8.9 × 10³–4.2 × 10⁵, and We > 32. Moreover, the scour profil...
Article
Full-text available
This paper compares the analyses of data from reservoir surveys and from sediment rating curves to predict sediment yield in three large reservoir watershed areas in Turkey. Sediment yield data were derived from reservoir sedimentation rates and suspended sediment measurements at gauging stations. The survey data were analysed to provide the volume...
Article
Full-text available
The cause of local scour around a bridge abutment is mainly the presence of spiraling vortex flow structure called the principal vortex. A rigid surface around an abutment with a collar can arrest the growth of the vortex, and therefore, reduces the scour depths around the abutment compared to the case without a collar. This paper presents an exper...
Conference Paper
Circular dropshafts, commonly used in urban storm water systems for energy dissipation and flow control, are characterized by significant flow aeration. In the laboratory, a series of experiments were performed in a circular dropshaft having two identical horizontal inflow and outflow circular channels having diameters of d=0.12 m, and a circular d...
Article
Simultaneous flow over weirs and below gates for free flow condition is experimentally investigated. Combination of a sharp-crested rectangular weir and rectangular gate is considered as a flow measurement structure which is named as H-weirs. H-weirs are defined by the width of the weir and gate openings, the height of the gate opening and the vert...
Conference Paper
The Hirfanlı Dam Reservoir is located on the Kızılırmak River in the central part of Turkey and has a storage capacity of 5.98x109 m3 at Normal Water Surface Elevation. Construction of the dam was started in 1953 and completed in 1959. In the present study, reservoir sedimentation in the Hirfanlı Dam was assessed by two ways; firstly comparison was...
Article
The characteristics of high-speed air-entrained jet flow over a spillway aerator were investigated using experimental data. Three different ramp designs (as well as the case of no ramp) were tested in a channel where the bed slope was adjusted to 0, 0.17, and 0.57, respectively. The effects of aerator geometry and flow condition on the air-entrainm...
Article
High-speed two-phase flows over a 30° stepped flume were experimentally investigated using macro-roughness elements. The roughness elements included combinations of steps and horizontal strips. Local values of air concentration, air bubble frequency, and mean chord lengths were measured by a fiber-optical instrumentation system in the air–water flo...
Article
Full-text available
This study investigated the reduction of scour around a vertical-wall bridge abutment using rectangular collars for clear-water flow conditions over uniform sediment particles in a laboratory flume. Collars of different sizes and at different elevations were tested to determine the temporal variation of scour depth around the bridge abutment. The d...
Conference Paper
The Demirköprü Reservoir is located on the Gediz River in West Central Turkey and has a storage capacity of 1.32x109 m3 at Normal Water Surface Elevation. Construction of the dam was started in 1954 and completed in 1960. Sediment accumulation within the Demirköprü Reservoir influences the operation life of the dam. In the present study, reservoir...
Article
The sediment budget of the Kizilirmak River has been disturbed during the last decade because of the flow regulation structures constructed on the river. This disruption has led to coastal erosion at the river mouth and its environs. With the effect of erosion within this period, the Black Sea shoreline has eroded approximately 1.0 km toward the Ba...
Article
In this study, fall velocities of 174 regularly shaped angular particles—namely cylindrical, cubic, wedge-shaped prisms, and box-shaped prisms—made of five different materials were measured in calm water conditions in a cylindrical settling column. Reynolds numbers based on particle fall velocity and characteristic length were varied, in the range...
Article
Full-text available
A new empirical equation is proposed for predicting critical flow velocity in slurry-transporting horizontal pipelines. An analysis of the settling velocity of solid particles, including the effect of solid particle concentration, is undertaken because of this parameter's importance. This study builds on a previous study carried out to consider the...

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