Mojtaba Saneie

Mojtaba Saneie
Soil conservation and watershed management Research Institute · River and coastal engineering

PhD in Hydraulic Structures Engineering

About

79
Publications
11,954
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318
Citations
Additional affiliations
July 1988 - present
Soil conservation and watershed management  Research Institute
Position
  • Scientific Board
Education
September 1995 - May 2000

Publications

Publications (79)
Article
Full-text available
Scour around bridge piers and abutments are among the most important causes of bridge destruction worldwide. The present laboratory study aims to evaluate the scour around bridge piers in presence of abutment and vegetation cover in floodplain. The experiments were performed in a rectangular channel with a composite section with the width and lengt...
Article
Full-text available
The present study aims to experimentally evaluate the hydraulic characteristics of a B-type triangular piano key weir (PKW). Equations are proposed for estimating the discharge coefficient (Cd) of type B triangular PKW. Nine PKW models were tested, and the discharge coefficients were obtained. To determine the PKW efficiency, in each flow condition...
Article
Full-text available
Bedload transport due to approved complexity and challenges has been the subject of different modeling approaches. Due to imprecise of the empirical equations, the potencies of the intelligent techniques in developing more accurate bedload predictive models have been highlighted. In this paper, an optimum hybridized artificial neural network (ANN)...
Article
Full-text available
Piano key weirs are a new type of weir designed to enhance the discharge capacity of dams. The present study is aimed at experimentally evaluating the hydraulic characteristics of a D-type triangular piano key weir. The purpose of these experiments was to study the flow regime, the stage-discharge relationship, and the effect of h/P ratio on the di...
Article
In general, the side weirs are the structures installed along a channel or river. When the flow depth rises above the weir crest, the overflow passes through these weirs and enters the lateral canal. Nowadays, piano key weirs are considered as an important alternative to labyrinth weirs to modify the weirs encountering with difficulty to pass the m...
Article
Full-text available
A new type of Long-crested weirs is Piano Key weir that allows the reservoir to run at a higher level. The use of a Piano Key weir as side weir allows for more drainage, due to the geometric shape of the channel and the impact of centrifugal force on the flow, in a channel having longitudinal curvature. This research, examine the Changing of flow p...
Article
Full-text available
Parallel skimming walls are regarded as one of the more efficient methods for controlling inlet sediment to a lateral intake. The present study attempts to experimentally scrutinize the impact of the angles of parallel skimming walls (θ), the corresponding distance (b), and the discharge variations of the main channel of the inlet sediment for the...
Article
The amount of transported sediment load by streams is a vital but high nonlinear dynamic process in water resources management. In the current paper, two optimum predictive models subjected to artificial neural network (ANN) were developed. The employed inputs were then prioritized using diverse sensitivity analysis (SA) methods to address new upda...
Article
The parallel skimming walls are regarded as one of most applicable methods for gaining decline in the amount of sediment entering the lateral intake. The parallel skimming walls are installed on the main channel, in front of the intake span, creating a rotational flow and divert the sediments from intake span, as a result the reduction in the amoun...
Article
Full-text available
Side weirs are hydraulic structures used for flow diversion in irrigation and drainage systems. Piano-key side weirs (PKSW) were investigated since 2017. For the specific width of a diversion channel, the discharge coefficient of PKSWs is far greater than that of classic rectangular side-weirs (CRSWs). In this study, the discharge coefficient of va...
Article
Full-text available
Rivers are considered as beneficial sources to provide gravel and sand for projects but it creates many negative hydraulic, physical and environmental effects. As the amount of infilling and appropriate location for better pit filling play important roles in scheduling the mining program and returning of the river to its stable condition, in this r...
Article
Side weirs deflect the approaching flow to the side channel with a specific angle. Considering this angled flow, the oblique shape of side weirs would improve the flow discharge efficiency. In this paper, a Piano Key Side Weir (PKSW) with oblique keys is proposed. Sixteen PKSWs with different key angles were studied in the laboratory, as well as tw...
Article
Full-text available
Channel junctions and lateral intakes are always caused turbulence in the passing flow. In this research, an experimental study was carried out to explore a possible method for sediment control for a series of skimming walls and a single spur dike, simultaneously. In order to direct the flow into the diversion channel and increase the skimming wall...
Article
Side weirs are hydraulic structures usually used for flow diversion in irrigation, drainage and sewer networks. The piano key weir (PKW) is the newest form of labyrinth weir. It is more efficient and needs less reinforcing steel. PKW can be used as a side weir. The aim of this research is to study the geometric and hydraulic parameters of type-A tr...
Article
Side weir is placed at the channel bank as a head regulator or a diversion device. Flow over a side weir has been the subject of many research studies considering its three dimensional and complicated characteristics. However, the labyrinth side weirs warrant further research due to their higher efficiency compared to linear side weirs. In this pap...
Article
Full-text available
A spillway is a hydraulic structure used to provide the controlled release of surplus waters and floods from a dam into a downstream area. A side weir is a multipurpose hydraulic structure which is constructed in water conveyance systems with a height lower than that of the canal wall. When the water surface level goes up, the side weir regulates t...
Article
Converging ogee spillway is employed as an emergency spillway constructed to control natural disasters such as instant floods. This paper presents an experimental study and artificial intelligence-based modeling of the discharge coefficient (Cd) of the converging ogee spillway (with a curve axis). The ogee spillway structure was tested in both symm...
Article
Ogee spillways with converging training walls are applied to lower the hazard of accidental flooding in locations with limited construction operations due to their unique structure. Hence, this type of structure is proposed as an emergency spillway. The present study aimed at experimental and machine learning-based modeling of the submerged dischar...
Article
Piano-key weirs can be used instead of classic rectangular side-weirs (CRSWs) to increase the discharge capacity of side weirs. So far, no research has been done on trapezoidal piano-key side weirs (TPKSWs) in a curved channel. This study examines the effect of using one or two cycles in TPKSWs on discharge capacity, having the same total width and...
Article
Side weir has many applications in water distribution and regulation in irrigation and flood control. For a constant opening length, weir crest can be design as labyrinth or piano key shape to increase the developed length and discharge coefficient. Another way to increase the side weir efficiency is oblique design, which make the weir crest aligne...
Article
River bed sand and gravel are utilized more than mountain materials due to their availability and closeness to the transit roads and sites of usage. Excessive and non-technical extraction of gravel and sand bring a kind of interference in them, leading to many negative consequences. Therefore, presenting solutions to reduce these impacts and infill...
Article
Side weirs are widely used to divert a part of the discharge in irrigation channels and sewer systems. To increase the discharge capacity of linear side weirs at constant length in a channel bank, the application of folded plan forms such as the labyrinth and piano key in a side configuration warrants further research. In this experimental study, n...
Article
Full-text available
Burrowing-type suction pipe method is a siphon dredging technique which removes sediment. This innovative technique attracted the attention of many researchers, recently, because of main advantages such as preventing water loss and conserving downstream environmental sustainability of dams. This study investigates the influence of geometrical and m...
Article
Many researchers by modifying different kinds of collar or combination of the collar and other local scour countermeasures try to weaken local scour mechanisms and reduce the scour depth or delay it. In present study a new kind of collar i.e. ridged collar, was employed as a local scour countermeasure to disrupt down-flow and horseshoe vortex agent...
Article
Many researchers by modifying different kinds of collar or combination of the collar and other local scour countermeasures try to weaken local scour mechanisms and reduce the scour depth or delay it. In present study a new kind of collar i.e. ridged collar, was employed as a local scour countermeasure to disrupt down-flow and horseshoe vortex agent...
Article
Full-text available
Downstream plunge pools of dams have been exposed to erosion caused by falling jets of the hydraulic structure’s outlets. This damages the foundation and body of the dam and its constituent structures. Therefore, investigating the scouring phenomenon of plunge pools is one of the important issues in hydraulic engineering. The present research inves...
Conference Paper
Full-text available
One obstacle of in imbibition of dam's reservoir in time of Floodwater is the Existence of Suspended sediment in floodwater. On the other hand because the lack of water resources in arid regions, providing of water is dependent on imbibition of dams. Thus existence of Suspended sediment in reservoir's water can malfunction in the imbibition program...
Article
Full-text available
A piano key side weir (PKSW) is a non-linear weir that discharge exceeds linear weirs by increasing the length in width. PKSW can be used in side weirs with space limitation. As side weirs are extensively used in flood control, water level control in rivers, and water supply channels, it is necessary to use PKSW as side weirs. This research discuss...
Article
Rivers are one of the most important borrow aggregates and sand and gravel mining in rivers due to the morphologic, hydraulic and sediment transport characteristics and methods of extraction create many negative effects in them. In this research, the influence of distance and shape of consequent bed material mining pits is investigated in order to...
Article
Full-text available
Piano key weir has a higher effective length in comparison with other weir types. Piano key weir Lateral weirs can be employed in irrigation and drainage networks, flood control systems and water & waste-water systems instead of common side weirs. Keeping in view that discharge coefficient evaluation of the weirs is mandatory in channels having lon...
Article
Full-text available
Sharp-crested weirs are widely used for the purposes of flow measurement, flow diversion and water level control in hydraulics, irrigation, and environmental projects. Discharge coefficient at these weirs is a function of head to weir height ratio (H/P). In a constant head, flow increases by increasing the length of weir in the plan. One of these w...
Article
Full-text available
Most of weirs create a region with relatively static water in upstream, which can be the place of sediments and wastes deposition in water. Sediments accumulation in upstream changes flow conditions. In this case, combined weir and gate can be propounded as a useful solution. In the present paper, Flow3D was used to numerically simulate temporal ch...
Article
Full-text available
Contrary to the single pier, due to the complexity of scour mechanism around pile groups, empirical methods do not give a satisfactory prediction for the scour depth around pier with multiple piles. It was shown recently that artificial neural networks have better prediction performance than empirical methods. In order to exploit the full potential...
Article
Stepped spillway is an effective approach to remove the potential occurrences of cavitation in chute of spillways and also to significantly reduce the size of energy dissipators at the toe of dam. In this study, to predict the energy dissipation ratio of flow over stepped spillways, artificial neural network, support vector machine, genetic program...
Article
Full-text available
Background and objectives: Sharp crested weirs are used for the purpose of flow measurement, flow diversion and water level control in hydraulics, irrigation and environmental projects. So exploring the features and characteristics of the hydraulic properties are an important issue in the design of these structures. Various studies have been done a...
Article
Sediment entering lateral intakes depends on flow pattern in intake entrance. Using a structure in front of intake entrance can changes this pattern and as a result the entering sediment. One of the effective methods to change pattern and manage sediment entering lateral intake is using skimming wall. By removing the sediments, in deed will not exi...
Article
Settlement of sediments behind weirs and accumulation of materials floating on water behind gates decreases the performance of these structures. Weir-gate is a combination of weir and gate structures which solves them Infirmities. Proposing a circular shape for crest of weirs to improve their performance, investigators have proposed cylindrical sha...
Conference Paper
Due to spur-dike construction along the river direction and reducing flow width, a shear distribution change may occur from upstream to downstream side of structure. So, this may lead to formation of wake vortices around spur-dike which results in extension of scour hole and may increase the risk of structure failure as well. In the present study,...
Article
Full-text available
In this paper, considering the accumulation of the sediments on the floor of the vortex settling basin during sediment extracting, curvature submerge vanes were used on the floor of the vortex basin and the effect of the size of the orifice was studied on the performance of the curvature submerge vanes for sediment leaching of the floor of the basi...
Article
Abstract: The present research investigate experimental the head loss of flow energy throw the semi cylindrical wire-gates. The effective parameters on the studied system in forms of dimensionless parameters obtained by using Buckingham’s theory. The experiments were conducted in a rectangular flume with the length of 8m, width of 0.282m and height...
Conference Paper
Full-text available
Construction of spur dike structures or bridge abutments in river streams may decrease the channel width and lead to a shear distribution change from upstream to downstream and result in bed erosion. The stability of Spur dike structures in rivers may be decreased due to a significant amount of local scour around them. High intensity turbulence flo...
Conference Paper
Full-text available
The spur-dike structures may be constructed along river streams to protect river banks from erosion or other purposes. Stability of these spur-dikes may be decreased due to formation of scour hole around their foundations. Due to spur-dike construction along the river direction and reducing the flow width, a shear distribution change may occur from...
Article
The combined weir-gate are one of the structures which can be substituted in channels instead of weirs and gates. Curvature of the semi cylindrical weir- gate structures lead to hold the water snap to the structures body and in comparison with sharp crested weir- gate structures were caused by increasing the amount of coefficient discharge. So in c...
Article
Full-text available
Abstract: The present research investigate the head loss of flow energy throw the semi cylindrical wire-gates. The effective parameters on the studied system in forms of dimensionless parameters obtained by using Buckingham’s theory. The experiments were conducted in a rectangular flume with the length of 8m, width of 0.282m and height of 0.3m in S...
Article
In this research the hydraulics property of flow on and under the semi-cylindrical gate with 180 degree of rotation around the main axis of gate has been studied in a way that the structure can act as both wire and gate-wire. The Experiments has been done in a horizontal channel with a length of 8 m and width of 0.282m through using PVC pipes with...
Conference Paper
Full-text available
در این پژوهش به بررسی خصوصیات جریان عبوری از دریچه نیم¬استوانه¬ای وقتی که سازه حول مرکز نیم استوانه می¬چرخد پرداخته شده است. آزمایشات در کانالی افقی به طول 8 متر و عرض 282/0 متر انجام شد. در این آزمایش از لوله¬های PVC با قطرهای 70، 120و 160 میلی متر به عنوان دریچه استفاده گردید. نتایج آزمایشات نشان داد که براي تمام زوایا با افزایش پارامتر بی¬بعد H/...
Conference Paper
این پژوهش به بررسی و مقایسه¬ی آزمایشگاهی رابطه دبی اشل و ضریب دبی در چرخش 360 درجه¬ای سازه نیم¬استوانه¬ای و تأثیر آن بر هیدرولیک جریان می¬پردازد، آزمایش¬ها در کانالی افقی به طول 8 متر و عرض 282/0 متر با استفاده از لوله¬های PVC با قطرهای 70، 120 و 160 میلی¬متر به عنوان سرریز و سرریز- دریچه انجام شد. نتایج پژوهش نشان می¬دهد در تمام زوایای قرارگیری سا...
Conference Paper
Full-text available
در این پژوهش به بررسی چرخش دریچه نیم¬استوانه¬اي بر افت انرژی از زوایاي 0 تا 90 درجه نسبت به افق در دو حالت انحنای نیم-استوانه به سمت بالادست و پایین¬دست پرداخته شده است. آزمایش¬ها در کانالی افقی به طول 8 متر و عرض 282/0 متر انجام شد. در این آزمایش از لوله¬های PVC با قطرهای 70، 120و 160 میلی¬متر به عنوان دریچه استفاده گردید. نتایج آزمایش¬ها نشان داد...
Conference Paper
Full-text available
One of the most important cause of bridges failure in river streams is local scour around their abutments. Due to abutment construction along the river direction and reducing the flow width, a hydrostatic pressure change may be occurred from upstream to downstream side of abutment. So, this may lead to formation of wake vortices and turbulence flow...
Article
Full-text available
Application of the vortex settling basins is one of the methods for controlling suspended sediments in the water structures. In this paper, considering the accumulation of the sediments at the floor of the vortex settling basin during sediment extracting, curvature submerged vanes in 90o radial section were used at the floor of the vortex basin and...
Article
Full-text available
In this century due to population growth, the use of river water has become more complicated. Since most rivers pass across loose and erodible areas, they always act as the most important factor of transferring eroded materials from the solid crust of the earth. Vortex basins are among the solutions known for the high-speed separation of solids fro...
Article
High gradient streams are characterised by steep slopes, coarse bed material with non-uniform size distribution, flash floods and flow depths of magnitude comparable to the bed material size. Another characteristic of high gradient streams is development of armor layers with cobbles and boulders. In these streams, it is often difficult to measure w...
Article
Full-text available
One of the sediment controlling methods in the hydraulics structures is application of the vortex settling basin. Such basins represent the higher speed in sediment separation in comparison with other usual settling structures. One of the problems of such settling structure is the settlement of a portion of the sediments on the basin floor as a res...
Article
Full-text available
Many bridges in the world every year for Failure to consider in the design of hydraulic elements are destroyed. During the spring floods of 1987, 17 bridges in New York and New England were damaged or destroyed by scour. In 1985, 73 bridges were destroyed by floods in Pennsylvania, Virginia, and West Virginia. In the present study investigate effec...
Conference Paper
Full-text available
Spillway is a structure that conveys the stream correctly and securely downside to ensure the stability and the permittivity of the dam during the flood. If topographic conditions are limited, the ogee spillway with curvature in the plan may be used. In this study, an experimental model of the Garmi-Chay Miane dam spillway was made in scale 1:50. T...
Article
Full-text available
The spillways are used in civil engineering works. In some cases to ensure that the water passes over the spillway on a smooth surface, the approach channel is used. In this study, an experimental model of the ogee spillway to arched plan and convergent sidewalls is examined. And to evaluate the effect of the approach channels, some channels with w...
Article
Full-text available
One of the ways to control the sediments in hydraulic structures is to use vortex settling basin. Vortex basins are among the solutions known for the high-speed separation of solids from liquids (filtration). One of the problems of such basins is the settling of sediments in their floor which necessitates the performance of required investigations...
Article
River banks are exposed to bank erosion and destruction. The undesirable effect of erosion is included muddy water and erosion increasing, river bank destruction and problem of sediment accumulation in shallow. A River utility for human requirements and decreasing the river's dangers are one of the river engineering goals. Expansion and risk of thi...
Conference Paper
Intake of river is done for different purposes such as irrigation, urban water supply, industry, electricity, etc. Side intakes are used for ongoing river to the flat lands. One of the issues that faced by designers of water structures is the design of sediment control facilities in the place of drainage and irrigation networks inlet. In this resea...
Conference Paper
Full-text available
Due to abutment construction along the flow line, the hydrostatic pressure from upstream to downstream change which cause turbulent flow and eddy flow around the abutment. The main mechanism of local scour is the eddy flow which not only causing scour in the front noise of abutment in long term but also make the possibility of construction failure...
Article
Scour is the main damage cause of abutments, piers, spur dykes and the hydraulic structures built in the river bed. By examining flow around the vertical wall abutment, it was observed that before the formation of scour hole, the streamlines at upstream of the abutment were deflected towards the noise abutment and the down flow in upstream face of...
Article
Full-text available
Bridge in flood plains can be damaged by the flood. The main problem of the structural can be the damage accountability to local scour. Phenomenon of local scour at the nose due to constriction of the flow and vortex would be caused strong. Use of numerical methods is difficult due to the complexity of the phenomenon and the influence of parameters...
Article
Full-text available
The maximum depth of scouring around spur dikes plays an important role in the hydraulic design process. There have been many studies on the maximum depth of scouring, but there is little information available on the time variation of scour depth. In this paper, the time variation of scouring around the first spur dike in a series was investigated...
Article
Scouring around the bridge piers causes a great deal of damage every year around the globe. Local scour is caused due to the large-scale eddy structures or a system of vortices, which are developed near the obstructions. To control this, a number of different methods have been proposed. One of the engineering methods of encountering to local scouri...
Article
One of the important issues in hydraulic engineering is inspection of local scour depth around bridge pier. Using piles is one of the ways for confronting local scour and erosion. In this study, the experiments were conducted in an 8m long, 0.5m deep and 0.25m wide flume. And the effect of using piles and number of them observed on the amount of sc...
Article
Full-text available
Vegetation roughness coefficients are the main parameters used to determine river flow characteristics and are known to depend on the flow condition (depth and velocity) as well as vegetation condition (type and density). Flume experiments were conducted to investigate the variation of roughness coefficients with flow conditions and vegetation dens...