Publications
Evaluation of Acid Rain Impacts Using Geostatistical Analysis and Remotely Sensed Data in Kirkuk City, Iraq
Mar 25, 2024Journal International Journal of Economic and Environmental Geology
Publisher Society of Economic Geologists and Mineral Technologists (SEGMITE)
Issue 3
Volume 14
Estimation of Mean Velocity Upstream and Downstream of a Bridge Model Using Metaheuristic Regression Methods
Sep 22, 2023Journal Water Resources Management
Publisher Springer Netherlands
DOI https://doi.org/10.1007/s11269-023-03618-6
Issue 14
Volume 37
This study compares four data-driven methods, Gaussian process regression (GPR), multivariate adaptive regression spline (MARS), M5 model tree (M5Tree), and multilinear regression (MLR), in estimating mean velocity upstream and downstream of bridges. Data were obtained through multiple experiments in a rectangular laboratory flume with glass walls 9.5 m long, 0.6 m wide, and 0.6 m deep. Four different bridge models were placed at the 6th meter of the channel to determine the average velocities upstream and downstream. Different data-driven models were implemented with different combinations of effective parameters as input. They were evaluated and compared using root mean square error (RMSE), mean absolute relative error (MARE), and Nash–Sutcliffe efficiency (NSE). The results showed that the MARS had the best efficiency in estimating the mean velocity upstream of the bridge model. At the same time, the M5Tree provided the highest performance in estimating the mean velocity downstream. The MARS method improved the estimation accuracy of GPR, M5Tree, and MLR in the test phase by 23.8%, 45.1%, and 47.4% concerning the RMSE at the upstream. The M5Tree provided better RMSE accuracy of 31.8%, 70.4%, and 75.5% at the downstream compared to MARS, GPR, and MLR, respectively. The study recommends the MARS and M5Tree for estimating mean velocities upstream and downstream of the bridge.
Analysis of Reinforced Concrete Beam Elements Impregnated with Ultra-High-Performance Fibers
Jul 26, 2023Journal Texas Journal of Engineering and Technology
Publisher Bumi Publikasi Nusantara
The manner of seismic elements made of Ultra-High Performance Fiber Reinforced Concrete (UHPFRC) differs significantly from conventional concrete. However, limited research exists in the literature on the dynamic manner of UHPFRC seismic members due to their high cost. Limited element programs can reduce the need for experimental studies to develop design procedures for large-scale seismic elements. Validated analytical models can be utilised to investigate the impact of geometric changes, loading schemes, and reinforcement ratios on the seismic behaviour. This research employed a limited element program, specifically ABAQUS, to model a UHPFRC beam subjected to dynamic loading and evaluate the predictive accuracy of the numerical model. The material model parameters were determined based on uniaxial pressure and tensile tests. The findings from the numerical models demonstrate that the analytical model effectively predicts the dynamic behaviour of UHPFRC beams.
GIS-Based Rainfall Analysis using Remotely Sensed Data in Kirkuk Province, Iraq
Dec 25, 2022Journal Tikrit Journal of Engineering Sciences
DOI https://doi.org/10.25130/tjes.29.4.6
Issue 4
Volume 29
This research aims to calculate the rate of rainfall for two consecutive years, 2018 and 2019, to study and analyze the drought periods during these years. The research was conducted in Kirkuk province north of Iraq, by dividing the study area into five regions based on five stations of rainfall records. Two types of data used in investigations; remotely sensed daily precipitations from integrated multi-satellite retrievals and monthly precipitations average rate from NASA power application. The methodology involved the calculation of rainfall rats by three methods; Mean, Thiessen’s polygons, and the Isohyetal technique. Data were analyzed, and final maps were produced using Geographic Information Systems. For the year 2018 the average annual rainfall rate produced by Mean, Thiessen’s polygons, and Isohyetal technique were; 1.376, 1.341, and 1.343 respectively. But, for the year 2019 the average annual rainfall rate produced by Mean, Thiessen’s polygons, and Isohyetal technique were; 0.966, 0.932, and 0.882 respectively. The results showed the scarcity of water and the lack of rainfall during the study years, which has a great impact on the region's exposure to drought, represented by the drying up of rivers.
Experimental and Numerical Investigation of Bridge Configuration Effect on Hydraulic Regime
Apr 10, 2022Journal International Journal of Civil Engineering
Publisher Springer International Publishing
DOI https://doi.org/10.1007/s40999-022-00715-2
Issue 8
Volume 20
The presence of a bridge structure in the river induces changes in the natural geometry of the river cross section by, therefore, altering the hydraulic regime significantly and causing the so-called backwater effect. Nevertheless, the effect of the bridge configuration on the hydraulic regime is barely studied. Therefore, the main objective of this study is to investigate the variations in the water surface profile and flow velocity due to the bridge structure configuration. For this purpose, the water surface profile and flow velocity on the upstream and downstream of the bridge were investigated for five flow discharges and four different bridge spans (M = b/B = 0.58, 0.67, 0.75, 0.83). In addition, the relationships between the bridge’s upstream and downstream average velocities were investigated. The analysis was carried out experimentally and numerically using the HEC-RAS model. The overall average velocity difference upstream of the bridge section was − 92.59%, while downstream of the bridge was determined as − 11.95%. So, the average velocities determined by HEC-RAS were considerably overestimated at the upstream part of the bridge. Linear relationships were identified for the average downstream and upstream measured velocities in the different openings. The correlation coefficients (R2) were significantly high for considered for all tested b/B ratios. Manning roughness coefficient n = 0.01 was found suitable for smooth open channel; nevertheless, a higher n value should be considered non-smooth open channel. The solution-oriented findings from this study might be helpful for engineers by assisting them to reduce uncertainties in the dimensioning of bridges structures.
Green Concrete: Ferrock Applicability and Cost- Benefit Effective Analysis
Sep 1, 2020Journal ASEAN Journal for Science and Engineering in Materials
Publisher Bumi Publikasi Nusantara
Issue 2
Volume 2
الوصف This research aims to assess the viability and suitability of Ferrock as an alternative to concrete for constructing foundations. The study evaluates the performance of Ferrock in foundation applications, compares its costs with traditional concrete, and examines the benefits of using Ferrock for foundations. To achieve these objectives, the utilization of Staad Pro and Foundation software is done to analyze the performance of Ferrock foundations. A cost-benefit analysis, considering factors like material costs, construction techniques, and maintenance requirements to determine the economic feasibility of Ferrock as a substitute for concrete and the potential to reduce carbon emissions, and promote environmentally friendly construction practices is also done. The research findings indicate that Ferrock exhibits promising performance characteristics for building foundations. It demonstrates comparable strength to traditional concrete while offering potential environmental benefits. Although implementing Ferrock may require an initial investment, the long-term advantages of reduced maintenance costs and improved sustainability contribute to its overall value proposition.