Search Results - "Kiyoumars Roushangar"

Hydraulic Performance of PK Weirs Based on Experimental Study and Kernel-based Modeling by Roushangar, Kiyoumars, Majedi Asl, Mahdi, Shahnazi, Saman

“…A piano key weir (PK weir) is a non-linear, labyrinth-type weir that benefits of a high discharge capacity, and is well suited for low head dams. Determination…”
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Daily lake-level time series spectral analysis using EMD, VMD, EWT, and EFD by Alizadeh, Farhad, Roushangar, Kiyoumars

“…ABSTRACT This study investigates the dynamics of daily Urmia Lake level (ULL) changes using spectral analysis tools to discover fluctuating patterns in the ULL…”
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Insights into the prediction capability of roughness coefficient in current ripple bedforms under varied hydraulic conditions by Roushangar, Kiyoumars, Shahnazi, Saman

“…Abstract Ubiquitous flow bedforms such as ripples in rivers and coastal environments can affect transport conditions as they constitute the bed roughness…”
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Spatiotemporal Analysis of Droughts Over Different Climate Regions Using Hybrid Clustering Method by Roushangar, Kiyoumars, Ghasempour, Roghayeh, Nourani, Vahid

“…Assessment of spatiotemporal variations of drought is an efficient method for implementing drought mitigation strategies and reducing its negative impacts…”
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Uncertainty Assessment of the Integrated Hybrid Data Processing Techniques for Short to Long Term Drought Forecasting in Different Climate Regions by Roushangar, Kiyoumars, Ghasempour, Roghayeh, Alizadeh, Farhad

“…Accurate prediction of drought indices is a useful method to reduce its undesirable consequences. In this study, the workability of newly integrated hybrid…”
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EEMD- and VMD-based hybrid GPR models for river streamflow point and interval predictions by Ghasempour, Roghayeh, Azamathulla, Hazi Mohammad, Roushangar, Kiyoumars

“…Abstract Reliable river streamflow (RSF) forecasting is an important issue due to its impact on planning and operation of the water resources system. In this…”
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Estimation of bedload discharge in sewer pipes with different boundary conditions using an evolutionary algorithm by Roushangar, Kiyoumars, Ghasempour, Roghayeh

“…Sediment transport is a complex phenomenon due to the nonlinearity and uncertainties of the process.The present study applies Gene Expression Programming (GEP)…”
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Determination of influential parameters for prediction of total sediment loads in mountain rivers using kernel-based approaches by Roushangar, Kiyoumars, Shahnazi, Saman

“…It is important to have a reasonable estimation of sediment transport rate with respect to its significant role in the planning and management of water…”
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Correction to: Spatiotemporal Analysis of Droughts Over Different Climate Regions Using Hybrid Clustering Method by Roushangar, Kiyoumars, Ghasempour, Roghayeh, Nourani, Vahid

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Novel application of robust GWO-KELM model in predicting discharge coefficient of radial gates: a field data-based analysis by Roushangar, Kiyoumars, Alirezazadeh Sadaghiani, Arman, Shahnazi, Saman

“…Abstract Accurate determination of discharge capacity in radial gates as commonly designed check structures is of great importance in hydraulic engineering…”
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An inverse problem for modeling open channel flow with movable bed by Roushangar, Kiyoumars, Ghasempour, Roghayeh, Azamathulla, Hazi Mohammad

“…Abstract In this research, an explicit finite difference two steps scheme developed by Richtmyer is presented for simulation of 1D steady/unsteady flow and bed…”
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Suspended sediment load prediction in consecutive stations of river based on ensemble pre-post-processing kernel based approaches by Ghasempour, Roghayeh, Roushangar, Kiyoumars, Sihag, Parveen

“…Abstract Sediment transportation and accurate estimation of its rate is a significant issue for river engineers and researchers. In this study, the capability…”
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MODWT and wavelet coherence-based analysis of groundwater levels changes detection by Roushangar, Kiyoumars, Dolatshahi, Mehri, Alizadeh, Farhad

“…This study used a model to capture trends and dominant periods in groundwater level (GWL), streamflow, and precipitation (GSP) data over the Azarshahr plain,…”
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The potential of ensemble WT-EEMD-kernel extreme learning machine techniques for prediction suspended sediment concentration in successive points of a river by Roushangar, Kiyoumars, Aghajani, Nasrin, Ghasempour, Roghayeh, Alizadeh, Farhad

“…Abstract Sediment transport is one of the most important issues in river engineering. In this study, the capability of the Kernel Extreme Learning Machine…”
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A multiscale time-space approach to analyze and categorize the precipitation fluctuation based on the wavelet transform and information theory concept by Roushangar, Kiyoumars, Nourani, Vahid, Alizadeh, Farhad

“…Abstract The present study proposed a time-space framework using discrete wavelet transform-based multiscale entropy (DWE) approach to analyze and spatially…”
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Prediction Characteristics of Free and Submerged Hydraulic Jumps on Horizontal and Sloping Beds using SVM Method by Roushangar, Kiyoumars, Homayounfar, Farzin

“…Doubtlessly hydraulic jump is a useful phenomenon in open channel flow such as rivers and spillways. As the most important characteristics of hydraulic jump,…”
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Towards design of compound channels with minimum overall cost through grey wolf optimization algorithm by Roushangar, Kiyoumars, Nouri, Aida, Shahnazi, Saman, Azamathulla, Hazi Md

“…Abstract The significant role of open channels in agriculture include supplying drinking water, industry, irrigation and flood control, making these hydraulic…”
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Hybrid models for drought forecasting: Integration of multi pre-processing-data driven approaches and non-linear GARCH time series model by Ghasempour, Roghayeh, Roushangar, Kiyoumars, Alizadeh, Farhad

“…This study introduces two integrated methods to model the short- to long-term droughts in terms of the Standardized Precipitation Index (SPI). In this regard,…”
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The effect of triangular prismatic elements on the hydraulic performance of stepped spillways in the skimming flow regime: an experimental study and numerical modeling by Roushangar, Kiyoumars, Akhgar, Samira, Shahnazi, Saman

“…Abstract The stepped spillway is a cost-effective hydraulic structure to dissipate the energy of large water flow over the spillway of a dam. In this study,…”
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Uncertainty analysis regarding evaluating effective parameters on the hydraulic jump characteristics of different shape channels by Roushangar, Kiyoumars, Homayounfar, Farzin, Ghasempour, Roghayeh

“…Abstract The hydraulic jump phenomenon is a beneficial tool in open channels for dissipating the extra energy of the flow. The sequent depth ratio and…”
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