Article
Computer Science, Artificial Intelligence
Alberto Rey, Bernardino Arcay, Alfonso Castro
Summary: This study presents a CAD system for lung nodule detection using a hybrid strategy of medical image analysis techniques and soft computing. The system achieves detection automation, reduces false positives in ROIs, and improves location detection.
EXPERT SYSTEMS WITH APPLICATIONS
(2021)
Article
Engineering, Marine
Xuguang Chen, Xixi Liu, Hui Li, Fengpeng Zhang, Xian Zhang, Kehu Li
Summary: This study experimentally investigates the influence of different seabed geotechnical properties on the scour depth of piles, and establishes the scour mechanism and prediction equation. The results show that the scour depth decreases with an increase in relative densities of sand. The sand friction angle plays a dominant role in the scour mechanism, and seabed stress is positively correlated with relative density of sand. The seepage force of the sand has little effect on the scour depth of piles.
Article
Energy & Fuels
Haiyang Dong, Zhilin Sun, Shibiao Fang, Enshang Yang, Yun Pan
Summary: Accurate prediction of local scour depth is crucial for bridge safety. A series of experiments were conducted to obtain the prediction formula of local scour depth around pile groups. The results demonstrate that the scouring depth decreases in the flow direction, with the deepest scouring occurring in the first row of the upstream surface. The introduced calculation coefficient for pile group scour depth shows good agreement with measured values, indicating its rationality.
Article
Engineering, Marine
Shengtao Du, Guoxiang Wu, David Z. Zhu, Risheng Wang, Youxiang Lu, Bingchen Liang
Summary: Scour around submerged square piles in combined waves and current is a rarely studied phenomenon. This study conducted experimental tests in current-only conditions with different pile height-to-width ratios and fixed flow intensity. Results showed that the pile height-to-width ratio had a significant effect on scour depth, and the sediment scour rate was controlled by flow intensity in the initial scouring stage. In wave-current scour, the time needed to reach equilibrium scouring depth was much shorter than in current-only conditions due to sediment backfilling induced by sand ripples.
Article
Engineering, Marine
Youxiang Lu, Bingchen Liang, Zegao Yin, Xinying Pan, Jun Wang, Shengtao Du
Summary: This study focuses on the importance of pile groups in long-term scour processes and how to predict them. Through flume experiments and data collection from literatures, an improved time factor is proposed, as well as another time factor for interpolation.
Article
Engineering, Multidisciplinary
Lihua Wang
Summary: This paper presents a FEM-ALEM coupling approach to study the dynamic interaction between a pile group and layered soils under scour condition. The effects of scour type, scour depth, scour width, and layered property of soil on the dynamic behaviors of the pile group are discussed through numerical analysis.
APPLIED MATHEMATICAL MODELLING
(2022)
Article
Engineering, Ocean
Xuguang Chen, Jinzhong Liu
Summary: This study investigates the effects of scour on rigid piles through scour tests under steady current and static lateral load tests. A three-dimensional scour hole model and its analytical expression suitable for engineering reality are proposed based on the results of scour tests. The results of load tests show that scour reduces the ultimate lateral capacity of foundations, with the reduction percentage related to the current direction but not affected by load eccentricity. Finally, a preliminary formula for evaluating the ultimate lateral capacity of rigid piles after scour is presented, providing a convenient and quick method to determine the upper and lower limits of scour effects.
APPLIED OCEAN RESEARCH
(2022)
Article
Engineering, Marine
Xiangfeng Lin, Jisheng Zhang, Dawei Guan, Jinhai Zheng, Hailong Wang, Bo Liu
Summary: Experimental research has shown that the scour depth of tidal stream turbines under bi-directional flow conditions changes with the reverse of flow direction. The scour pattern is similar to that of a monopile foundation, but with a faster rate and a deeper scour depth. The impacts of flow intensity and tip clearance on the scour depth are examined and linear and quadratic relationships are obtained, respectively. Finally, an equation for predicting the scour depth of a tidal stream turbine under bi-directional flow is proposed and shows good agreement with experimental results.
Article
Agronomy
Pankaj Das, Girish Kumar Jha, Achal Lama, Rajender Parsad
Summary: This paper introduces a novel hybrid approach, combining machine learning algorithms with feature selection, for efficient modelling and forecasting of complex phenomenon governed by multifactorial and nonlinear behaviours, such as crop yield. The proposed MARS-based hybrid models outperformed individual models such as MARS, SVR and ANN. This is largely due to the enhanced feature extraction capability of the MARS model coupled with the nonlinear adaptive learning ability of ANN and SVR.
Article
Engineering, Marine
Yalcin Yuksel, Yesim Celikoglu, Elif Sen
Summary: This study experimentally investigated scouring formation around pile groups with different configurations exposed to a ship's main propeller jet flow. The equilibrium scour depth of the pile groups depends on the space between piles, densimetric Froude number, and position of the propeller. The maximum scour depths around pile groups were found to be larger than those around single piles under the same flow conditions.
Article
Computer Science, Interdisciplinary Applications
Wenyu Jiang, Cheng Lin
Summary: This study proposes a practical method to analyze the lateral responses of pile groups in soft clays affected by local scour. The proposed method was verified and parametric analyses were conducted. The importance of hydraulic group effect in the evaluation of lateral behavior of scoured pile groups was highlighted.
COMPUTERS AND GEOTECHNICS
(2022)
Article
Engineering, Marine
Wenyu Jiang, Cheng Lin
Summary: This study proposed an improved analytical method for analyzing the lateral responses of scour-affected pile groups, conducted parametric analyses to investigate the effects of various factors on post-scour vertical effective stresses and lateral responses of pile groups, and developed a practical design approach called the influence depth method. The feasibility of applying the standard methods for the scoured pile groups was evaluated by comparing them with 3D FE analyses and the proposed methods.
Review
Computer Science, Interdisciplinary Applications
Ahmad Sharafati, Masoud Haghbin, Davide Motta, Zaher Mundher Yaseen
Summary: This article explores the prediction of scouring characteristics in hydraulic and hydrology engineering, comparing and evaluating several Soft Computing (SC) models used for simulating scouring depth. It also identifies some research gaps and proposes future research directions.
ARCHIVES OF COMPUTATIONAL METHODS IN ENGINEERING
(2021)
Article
Engineering, Marine
Haiyang Cheng, Yongzhou Cheng, Xiaoguang Wang, Bo Xia, Xing Lyu, Yuwei Zheng, Jing Zhang
Summary: Compared to vertical piles, the position relationship between the inclined pile and seabed has some extra effects on the surrounding wave-current interaction and sediment transporting mechanism. The magnitude relationship of relative scour depth (S/D) between the inclined and vertical piles will change visibly when the sand transporting capacity under wave-current action reaches a certain level.
Article
Chemistry, Multidisciplinary
N. Taoufik, W. Boumya, R. Elmoubarki, A. Elhalil, M. Achak, M. Abdennouri, N. Barka
Summary: This study comparatively investigated the sorption of caffeine on fresh and calcined Cu-Al layered double hydroxide, developing reliable models through data mining methods. Various characterization techniques were used to analyze the characteristics of HDL, revealing its structural and functional features. The proposed machine learning models proved to be reliable computer methods for monitoring and simulating the adsorption of pollutants by Cu-Al-LDH from aqueous solutions.
MATERIALS TODAY CHEMISTRY
(2022)
Article
Computer Science, Interdisciplinary Applications
Shabnam Hosseinzadeh, Amir Etemad-Shahidi, Ali Koosheh
Summary: This study evaluates the capabilities of two kernel-based methods (GPR and support vector regression) in predicting the mean wave overtopping rate at sloped breakwaters, showing their superiority over artificial neural networks and empirical formulas. By testing different parameter combinations, the optimal input combination was proposed, demonstrating the reliability of kernel-based models in terms of physical representation of the overtopping phenomenon.
JOURNAL OF HYDROINFORMATICS
(2021)
Editorial Material
Engineering, Civil
Saeed Shaeri, Amir Etemad-Shahidi, Rodger Tomlinson
JOURNAL OF WATERWAY PORT COASTAL AND OCEAN ENGINEERING
(2021)
Article
Engineering, Civil
Mohammed Al-Ogaili, Amir Etemad-Shahidi, Nick Cartwright, Sigurdur Sigurdarson
Summary: The study highlighted the importance of berm recession in the design and assessment of berm breakwaters, with different recession formulas showing varying performances. The stability number was found to be the significant parameter influencing recession, but there was inconsistency regarding the influence of T0 on recession amongst the formulas. Some formulas performed better in predicting recession, such as Sigurdarson and Van der Meer (2013) formula, showing better accuracy in this case.
COASTAL ENGINEERING
(2022)
Article
Engineering, Civil
Ali Koosheh, Amir Etemad-Shahidi, Nick Cartwright, Rodger Tomlinson, Marcel R. A. van Gent
Summary: This study investigates the wave overtopping rate at rubble mound seawalls through physical model tests and proposes a new formula which significantly improves prediction accuracy compared to existing empirical formulae.
COASTAL ENGINEERING
(2022)
Article
Engineering, Civil
Amin Reza Zarifsanayei, Jose A. A. Antolinez, Amir Etemad-Shahidi, Nick Cartwright, Darrell Strauss
Summary: This paper investigates the uncertainty of longshore sediment transport (LST) rates along a non-straight coastline using an ensemble modeling framework. The results show that the uncertainty of LST rates is higher for open coasts compared to semi-sheltered coasts, with the choice of wave transformation methods being a major factor in the annual uncertainty.
COASTAL ENGINEERING
(2022)
Article
Environmental Sciences
Amin Reza Zarifsanayei, Jose A. A. Antolinez, Amir Etemad-Shahidi, Nick Cartwright, Darrell Strauss, Gil Lemos
Summary: This study quantifies uncertainties in potential longshore sediment transport (LST) rate changes along a non-straight coastline. The study addresses four main sources of uncertainty, including emission scenarios, Global Circulation Model-driven offshore wave datasets, LST models, and their interactions. Two ensemble modelling frameworks are used to analyze these uncertainties. The results show that bias correction can reduce the range of uncertainty in LST projections. However, no robust projected changes in LST rates on annual and seasonal scales were found.
FRONTIERS IN MARINE SCIENCE
(2022)
Correction
Engineering, Civil
Amir Etemad-Shahidi, Meysam Bali, Marcel R. A. van Gent
COASTAL ENGINEERING
(2022)
Article
Engineering, Environmental
Mohammad Hassan Ranjbar, David P. Hamilton, Amir Etemad-Shahidi, Fernanda Helfer
Summary: This study investigates the impact of atmospheric stilling on the distribution of Microcystis blooms. The results highlight the importance of considering dynamic variations in colony size for accurate prediction of cyanobacterial bloom development and decay. The findings suggest that atmospheric stilling needs to be included in projections of changes in the frequency, distribution and magnitude of blooms of buoyant, colony-forming cyanobacteria under climate change.
Article
Engineering, Civil
Amir Etemad-Shahidi, Ali Koosheh, Marcel R. A. van Gent
Summary: This study focuses on improving the formula for the mean overtopping discharge in rubble mound structures by considering the physics of the process. A simple and superior formula was developed, evaluated against existing ones, and design guidelines were provided for practitioners.
COASTAL ENGINEERING
(2022)
Article
Engineering, Civil
Ali Koosheh, Amir Etemad-Shahidi, Nick Cartwright, Rodger Tomlinson, Marcel R. A. van Gent
Summary: This study contributes to the knowledge of individual overtopping volumes and the estimation of maximum volume (Vmax) in rubble mound seawalls. Through small-scale physical model tests and statistical analysis, weighted methods were found to be superior in estimating Vmax, reducing scatter index values by 23% and 17% compared to existing methods. Additionally, a simple empirical formula was developed for Vmax estimation, outperforming distribution-based methods and existing formulas.
COASTAL ENGINEERING
(2022)
Correction
Engineering, Civil
Saeed Shaeri, Amir Etemad-Shahidi
COASTAL ENGINEERING
(2022)
Review
Energy & Fuels
Shabnam Hosseinzadeh, Amir Etemad-Shahidi, Rodney A. Stewart
Summary: Growing energy demand worldwide has led to increased interest in offshore renewable energy exploitation. Combining wind and wave energy can result in stable power output at a lower cost. Identifying optimal locations for offshore renewable energy farms is crucial.
Article
Engineering, Marine
Mohammad Hossein Kazeminezhad, Farrokh Alavian Ghavanini
Summary: An operational wave forecasting system using GFS winds for the Arabian Sea was presented and evaluated. The WAVEWATCH III (WWIII) model was used for wave forecasting with different input-dissipation parameterizations. The performance of the forecasting system was evaluated by comparing the forecasted significant wave heights (Hs) with measured data. The results showed that the forecasted data from different source term packages were well adapted to the measured data during the southwest monsoon, with ST3 and ST4 packages outperforming the others.
Article
Engineering, Marine
Meysam Bali, Amir Etemad-Shahidi, Marcel R. A. van Gent
Summary: Slope stability formulae for rubble mound structures are usually developed for head-on conditions. The effect of oblique waves is often neglected, but it can result in a reduction in required armour size. This study aims to develop a suitable wave obliquity reduction factor for the stability formula and demonstrates an improved stability prediction using this factor.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Environmental Sciences
Amin Reza Zarifsanayei, Jose A. A. Antolinez, Nick Cartwright, Amir Etemad-Shahidi, Darrell Strauss, Gil Lemos, Alvaro Semedo, Rajesh Kumar, Mikhail Dobrynin, Adem Akpinar
Summary: Four experiments were conducted to investigate uncertainty in future longshore sediment transport (LST) projections, including working with continuous or sliced time series of waves, different wave-model-parametrization pairs, and the inclusion/exclusion of sea level rise (SLR) for wave transformation. The results showed that the uncertainty in LST projections depends on model selection, climate variability, wave parameterization schemes, and the inclusion of SLR. The study also found that CMIP6 and CMIP5 driven wave climatology yield similar outcomes, and that the variability of LST rates is influenced by the parameterization schemes of the wave simulations.
FRONTIERS IN MARINE SCIENCE
(2023)