Pub Date : 2026-03-01Epub Date: 2026-01-02DOI: 10.1016/j.dynatmoce.2025.101640
Layal Jradi , Jean-Claude Dupla , Bassel Seif El Dine , Jean Canou , Noreen Sher Akbar
This paper presents the results of the undrained cyclic behavior of sand-fines mixtures in terms of liquefaction susceptibility. The cyclic shear resistance CSR curves for sand-fines mixtures (plastic/non-plastic) were established for various fines content that range between 0 % and 5 %. The results show that the presence of non-plastic fines tend to increase liquefaction resistance of sands, whereas plastic fines lead to a decrease in the latter. The analysis of the CSR curves reveals a non-linear relationship described by a power function of the form CSR=a.Nb where parameters ‘a’ and ‘b’ were quantified. Parameter ‘b’ was found to be constant whereas ‘a’ varies systematically with fines content. This has led to the development of a predictive criterion that allows the estimation of the CSR curve of mixtures based on the CSR of the clean sand. A comparison was made between the predicted curves and results found in the literature which was found to be acceptable.
本文从液化敏感性的角度对砂粉混合物的不排水循环特性进行了研究。在细粒含量为0 % ~ 5 %范围内，建立了砂-细粒混合物（塑性/非塑性）的循环抗剪CSR曲线。结果表明：非塑性细粒的存在有增加砂土液化阻力的趋势，而塑性细粒的存在则会降低砂土液化阻力。CSR曲线的分析揭示了一种由CSR=a形式的幂函数描述的非线性关系。Nb，其中参数a和b被量化。参数‘ b ’是恒定的，而‘ a ’随着细粒含量的变化而系统地变化。这导致了一种预测标准的发展，该标准可以根据清洁砂的CSR来估计混合物的CSR曲线。将预测曲线与文献结果进行比较，认为是可以接受的。
{"title":"Cyclic shear resistance of sand–fines mixtures using clean sand as baseline","authors":"Layal Jradi , Jean-Claude Dupla , Bassel Seif El Dine , Jean Canou , Noreen Sher Akbar","doi":"10.1016/j.dynatmoce.2025.101640","DOIUrl":"10.1016/j.dynatmoce.2025.101640","url":null,"abstract":"<div><div>This paper presents the results of the undrained cyclic behavior of sand-fines mixtures in terms of liquefaction susceptibility. The cyclic shear resistance CSR curves for sand-fines mixtures (plastic/non-plastic) were established for various fines content that range between 0 % and 5 %. The results show that the presence of non-plastic fines tend to increase liquefaction resistance of sands, whereas plastic fines lead to a decrease in the latter. The analysis of the CSR curves reveals a non-linear relationship described by a power function of the form CSR=a.N<sup>b</sup> where parameters ‘a’ and ‘b’ were quantified. Parameter ‘b’ was found to be constant whereas ‘a’ varies systematically with fines content. This has led to the development of a predictive criterion that allows the estimation of the CSR curve of mixtures based on the CSR of the clean sand. A comparison was made between the predicted curves and results found in the literature which was found to be acceptable.</div></div>","PeriodicalId":50563,"journal":{"name":"Dynamics of Atmospheres and Oceans","volume":"113 ","pages":"Article 101640"},"PeriodicalIF":2.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145925473","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-03-01Epub Date: 2025-12-20DOI: 10.1016/j.dynatmoce.2025.101634
P.S. Swathy Krishna , M. Ramesh , C.T. Tejavath , N. Sreejith , Vijay Kumar Vishnu , L. Sheela Nair
This study analyzes two significant swell events along the southwest coast of India during March and April of 2020, characterized by multi-directional swells originating from an extensive swell generation area spanning the Indian Atlantic Southern Ocean (IASO) interface to western Australia. The research reveals the critical role of Cut off Low (CoL) formations and Southern Ocean current systems in modulating storm propagation and enhancing swell impact. In this study, through sophisticated spectral analysis, we show the presence of diverse long-distance swell systems in nearshore environments, demonstrating complex wave propagation mechanisms. Intricate swell-to-swell interactions and short-span eddy formations were observed to redirect swell patterns towards the Arabian Sea, significantly altering wave dynamics. The coastal state was predominantly influenced by swell, with total water levels increasing by ∼33 % and ∼34 % during the flooding events, predominantly attributable to wave dynamics rather than the tidal influences. The substantial rise in swell-induced flooding events along the southern southwest coast of India presents a critical environmental concern. Consequently, this study proposes developing a comprehensive metadata collection system for early warning mechanisms and provides nuanced insights into surface circulation within the Southwest Indian Ocean during the Austral autumn. By elucidating the complex interactions of eddy formations in the SEIO, the study offers crucial predictive potential for oceanic weather and climatic events in the Indian Ocean, with significant implications for future regional engineering activities.
{"title":"Multidirectional swell dynamics in the Indian ocean during the austral autumn and coastal flooding implications for the southwest coast of India","authors":"P.S. Swathy Krishna , M. Ramesh , C.T. Tejavath , N. Sreejith , Vijay Kumar Vishnu , L. Sheela Nair","doi":"10.1016/j.dynatmoce.2025.101634","DOIUrl":"10.1016/j.dynatmoce.2025.101634","url":null,"abstract":"<div><div>This study analyzes two significant swell events along the southwest coast of India during March and April of 2020, characterized by multi-directional swells originating from an extensive swell generation area spanning the Indian Atlantic Southern Ocean (IASO) interface to western Australia. The research reveals the critical role of Cut off Low (CoL) formations and Southern Ocean current systems in modulating storm propagation and enhancing swell impact. In this study, through sophisticated spectral analysis, we show the presence of diverse long-distance swell systems in nearshore environments, demonstrating complex wave propagation mechanisms. Intricate swell-to-swell interactions and short-span eddy formations were observed to redirect swell patterns towards the Arabian Sea, significantly altering wave dynamics. The coastal state was predominantly influenced by swell, with total water levels increasing by ∼33 % and ∼34 % during the flooding events, predominantly attributable to wave dynamics rather than the tidal influences. The substantial rise in swell-induced flooding events along the southern southwest coast of India presents a critical environmental concern. Consequently, this study proposes developing a comprehensive metadata collection system for early warning mechanisms and provides nuanced insights into surface circulation within the Southwest Indian Ocean during the Austral autumn. By elucidating the complex interactions of eddy formations in the SEIO, the study offers crucial predictive potential for oceanic weather and climatic events in the Indian Ocean, with significant implications for future regional engineering activities.</div></div>","PeriodicalId":50563,"journal":{"name":"Dynamics of Atmospheres and Oceans","volume":"113 ","pages":"Article 101634"},"PeriodicalIF":2.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145840695","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The present work examines the behavior of immiscible couple stress fluid flow between two homogeneous porous beds with different permeability in which a couple stress nanofluid flows in region-1 and a couple stress micropolar fluid flows in region-2. This study aims to analyze the influence of couple stress on immiscible fluids flow with various Reynolds numbers and porous beds of different permeability. The fluid motion within the specified region is induced by a constant pressure gradient along the direction of flow, and Beavers–Joseph slip boundary conditions are imposed on the porous and fluid interface. Linear Differential Equation is being used to solve the mathematical model. The expressions for fluid linear velocity, slip velocity, microrotational velocity, flow rate, and wall shear stress are achieved within the confines of a structured form. The graphical representations demonstrate the impact of various physical parameters associated with the proposed model on velocity and flow rate. The significant finding of this study is that the maximum flow rate obtained at the highest Reynolds number, while an increase in couple stress parameters enhances the linear velocities of both immiscible fluids. Furthermore, the findings of this investigation are in agreement with the results reported in previous studies, thereby validating the precision of the present analysis. The design of present work holds immense potential for advancing oil recovery techniques in the petroleum industry by assessment of drag reduction and flow control due to couple-stress and micropolar effects, enhancing the understanding of fluid flow within reservoir rocks, and contributing to innovative applications in biomedical engineering used for flow of biofluids with microstructure (e.g., blood exhibiting micropolar behavior) through porous tissues or engineered scaffolds.
{"title":"Investigation of immiscible couple stress nanofluid and micropolar fluid flow through porous beds with different permeability","authors":"Alpana Srivastava , Ajit Kumar , Akhilesh Chandra Pandey","doi":"10.1016/j.dynatmoce.2025.101638","DOIUrl":"10.1016/j.dynatmoce.2025.101638","url":null,"abstract":"<div><div>The present work examines the behavior of immiscible couple stress fluid flow between two homogeneous porous beds with different permeability in which a couple stress nanofluid flows in region-1 and a couple stress micropolar fluid flows in region-2. This study aims to analyze the influence of couple stress on immiscible fluids flow with various Reynolds numbers and porous beds of different permeability. The fluid motion within the specified region is induced by a constant pressure gradient along the direction of flow, and Beavers–Joseph slip boundary conditions are imposed on the porous and fluid interface. Linear Differential Equation is being used to solve the mathematical model. The expressions for fluid linear velocity, slip velocity, microrotational velocity, flow rate, and wall shear stress are achieved within the confines of a structured form. The graphical representations demonstrate the impact of various physical parameters associated with the proposed model on velocity and flow rate. The significant finding of this study is that the maximum flow rate obtained at the highest Reynolds number, while an increase in couple stress parameters enhances the linear velocities of both immiscible fluids. Furthermore, the findings of this investigation are in agreement with the results reported in previous studies, thereby validating the precision of the present analysis. The design of present work holds immense potential for advancing oil recovery techniques in the petroleum industry by assessment of drag reduction and flow control due to couple-stress and micropolar effects, enhancing the understanding of fluid flow within reservoir rocks, and contributing to innovative applications in biomedical engineering used for flow of biofluids with microstructure (e.g., blood exhibiting micropolar behavior) through porous tissues or engineered scaffolds.</div></div>","PeriodicalId":50563,"journal":{"name":"Dynamics of Atmospheres and Oceans","volume":"113 ","pages":"Article 101638"},"PeriodicalIF":2.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145884073","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The thermodynamical and microphysical characteristics of precipitation systems in shallow, Bright Band (BB), and Non-Bright Band (NBB) categories over a coastal site in Thiruvananthapuram, India were investigated. Radar reflectivity and fall velocity profiles, and surface rain rates were utilized to categorize the precipitation systems in June-July 2022. Shallow and NBB events exhibit a significant increase in humidity within the 4–8 km layer around 10–20 min prior to the onset of precipitation. In contrast, BB events maintain a deeper humid layer extending from the surface up to 8 km, with high liquid water content observed at least 30 min before precipitation, supporting widespread precipitation over the coastal region. In both NBB and shallow events, a sharp increase in liquid water path, integrated water vapor, and convective available potential energy (CAPE) occurred ∼10 min before rainfall onset. The substantially higher magnitudes of moisture and instability parameters in NBB systems indicate convective development, while the relatively lower values in shallow systems reflect weak instability and limited vertical growth, resulting in short-lived, low-intensity precipitation. BB systems maintained elevated and steady moisture with minimal variation in CAPE, supporting prolonged stratiform rain. The study shows that shallow systems are primarily influenced by low-level moisture, whereas BB and NBB systems rely on deeper mid- and upper-tropospheric moisture to sustain precipitation. CAPE influences rain rates and raindrop size distributions, with NBB events pronounced response, marked by intense rainfall and broader drop spectra.
{"title":"Moisture build-up and thermodynamic processes in precipitation regimes during the southwest monsoon over a tropical coastal region","authors":"Anusha Andrews , E.A. Resmi , R.K. Sumesh , Sneha Sunil , A.R. Aswini , Nita Sukumar , Sumit Kumar , A. Sabarinath , Tejavath Charan Teja , Dharmadas Jash","doi":"10.1016/j.dynatmoce.2025.101601","DOIUrl":"10.1016/j.dynatmoce.2025.101601","url":null,"abstract":"<div><div>The thermodynamical and microphysical characteristics of precipitation systems in shallow, Bright Band (BB), and Non-Bright Band (NBB) categories over a coastal site in Thiruvananthapuram, India were investigated. Radar reflectivity and fall velocity profiles, and surface rain rates were utilized to categorize the precipitation systems in June-July 2022. Shallow and NBB events exhibit a significant increase in humidity within the 4–8 km layer around 10–20 min prior to the onset of precipitation. In contrast, BB events maintain a deeper humid layer extending from the surface up to 8 km, with high liquid water content observed at least 30 min before precipitation, supporting widespread precipitation over the coastal region. In both NBB and shallow events, a sharp increase in liquid water path, integrated water vapor, and convective available potential energy (CAPE) occurred ∼10 min before rainfall onset. The substantially higher magnitudes of moisture and instability parameters in NBB systems indicate convective development, while the relatively lower values in shallow systems reflect weak instability and limited vertical growth, resulting in short-lived, low-intensity precipitation. BB systems maintained elevated and steady moisture with minimal variation in CAPE, supporting prolonged stratiform rain. The study shows that shallow systems are primarily influenced by low-level moisture, whereas BB and NBB systems rely on deeper mid- and upper-tropospheric moisture to sustain precipitation. CAPE influences rain rates and raindrop size distributions, with NBB events pronounced response, marked by intense rainfall and broader drop spectra.</div></div>","PeriodicalId":50563,"journal":{"name":"Dynamics of Atmospheres and Oceans","volume":"112 ","pages":"Article 101601"},"PeriodicalIF":2.0,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145321504","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-01Epub Date: 2025-10-16DOI: 10.1016/j.dynatmoce.2025.101605
Alberto Alatriste-Domínguez , Zobeida Jezabel Guzmán-Zavaleta , José Manuel Cabrera-Miranda
Developing countries lie vulnerable to increasingly intense tropical cyclones. The storm surge caused by nine tropical cyclones is analyzed using machine learning models. The tropical cyclones’ data is transformed into an eight-feature dataset. A fitted artificial neural network (ANN) and eight categories of other machine learning models are constructed and trained with the dataset. The effect and performance of forecasting windows is assessed. The fitted ANN and Ensemble Boosted Trees were the best performing models, as they reach an RMSE as low as 2 cm. The models manage to extract the relationships between the parameters due to their performance on the unknown testing dataset. The models are then assessed in a spatio-temporal scenario on historical tropical cyclones. This application develops insights into its response’s adjustment to observed elevations along the coast. Overall, the models accurately estimate the extent and duration of the storm surge where tide stations are present and highlight regions of potential interest due to higher storm surges for research and resource investment. This work contributes towards the application of ML models in developing countries with low infrastructure density and data availability, by increasing spatial density of the storm surge data, with the benefit of low computational costs.
{"title":"Storm surge spatio-temporal modelling using machine learning on the eastern coast of the Yucatan Peninsula","authors":"Alberto Alatriste-Domínguez , Zobeida Jezabel Guzmán-Zavaleta , José Manuel Cabrera-Miranda","doi":"10.1016/j.dynatmoce.2025.101605","DOIUrl":"10.1016/j.dynatmoce.2025.101605","url":null,"abstract":"<div><div>Developing countries lie vulnerable to increasingly intense tropical cyclones. The storm surge caused by nine tropical cyclones is analyzed using machine learning models. The tropical cyclones’ data is transformed into an eight-feature dataset. A fitted artificial neural network (ANN) and eight categories of other machine learning models are constructed and trained with the dataset. The effect and performance of forecasting windows is assessed. The fitted ANN and Ensemble Boosted Trees were the best performing models, as they reach an RMSE as low as 2 cm. The models manage to extract the relationships between the parameters due to their performance on the unknown testing dataset. The models are then assessed in a spatio-temporal scenario on historical tropical cyclones. This application develops insights into its response’s adjustment to observed elevations along the coast. Overall, the models accurately estimate the extent and duration of the storm surge where tide stations are present and highlight regions of potential interest due to higher storm surges for research and resource investment. This work contributes towards the application of ML models in developing countries with low infrastructure density and data availability, by increasing spatial density of the storm surge data, with the benefit of low computational costs.</div></div>","PeriodicalId":50563,"journal":{"name":"Dynamics of Atmospheres and Oceans","volume":"112 ","pages":"Article 101605"},"PeriodicalIF":2.0,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145362474","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-01Epub Date: 2025-09-07DOI: 10.1016/j.dynatmoce.2025.101598
Huan Wu , Shijian Zhou , Fengwei Wang , Tieding Lu , Xiao Li
Reliable sea level predictions are essential for ensuring the sustainability and ecological protection of coastal areas. An adaptive deep learning sea level height prediction hybrid model based on the improved dung beetle optimizer (OLSDBO), bidirectional temporal convolutional network (BiTCN), and bidirectional gated recurrent unit (BiGRU) is proposed in this paper. Initially, we optimize the BiTCN-BiGRU hyperparameters via OLSDBO. Sea level data are fed into the BiTCN, where bidirectional temporal convolutions with dilated causal layers and residual connections extract hidden information. Next, the extracted features are passed into the BiGRU to learn the dynamic changes in both directions, thereby capturing the temporal dependencies within the sequence. Finally, the optimal model prediction results are obtained. The model was evaluated via Australian tide gauge data and compared with nine relevant models. The experimental results show that the OLSDBO-BiTCN-BiGRU outperforms the comparison models, indicating its strong modeling capabilities. To address the randomness in neural network initialization, statistical comparisons were conducted with ten random seeds, confirming robustness. When applied to satellite altimetry data from the East China Sea, the model indicated a 3.28 ± 0.26 mm/a rise (1993–2023), corroborating the official bulletins. This study introduces a novel framework and practical pathway for regional sea level prediction, offering practical value for coastal management and climate adaptation strategies.
{"title":"An optimized network model for sea level height prediction integrating OLSDBO and BiTCN-BiGRU","authors":"Huan Wu , Shijian Zhou , Fengwei Wang , Tieding Lu , Xiao Li","doi":"10.1016/j.dynatmoce.2025.101598","DOIUrl":"10.1016/j.dynatmoce.2025.101598","url":null,"abstract":"<div><div>Reliable sea level predictions are essential for ensuring the sustainability and ecological protection of coastal areas. An adaptive deep learning sea level height prediction hybrid model based on the improved dung beetle optimizer (OLSDBO), bidirectional temporal convolutional network (BiTCN), and bidirectional gated recurrent unit (BiGRU) is proposed in this paper. Initially, we optimize the BiTCN-BiGRU hyperparameters via OLSDBO. Sea level data are fed into the BiTCN, where bidirectional temporal convolutions with dilated causal layers and residual connections extract hidden information. Next, the extracted features are passed into the BiGRU to learn the dynamic changes in both directions, thereby capturing the temporal dependencies within the sequence. Finally, the optimal model prediction results are obtained. The model was evaluated via Australian tide gauge data and compared with nine relevant models. The experimental results show that the OLSDBO-BiTCN-BiGRU outperforms the comparison models, indicating its strong modeling capabilities. To address the randomness in neural network initialization, statistical comparisons were conducted with ten random seeds, confirming robustness. When applied to satellite altimetry data from the East China Sea, the model indicated a 3.28 ± 0.26 mm/a rise (1993–2023), corroborating the official bulletins. This study introduces a novel framework and practical pathway for regional sea level prediction, offering practical value for coastal management and climate adaptation strategies.</div></div>","PeriodicalId":50563,"journal":{"name":"Dynamics of Atmospheres and Oceans","volume":"112 ","pages":"Article 101598"},"PeriodicalIF":2.0,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145097759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-01Epub Date: 2025-09-19DOI: 10.1016/j.dynatmoce.2025.101600
Mair Khan , T. Salahuddin , Muhammad Awais , Basem Al Awan , Muyassar Norberdiyeva , Nidhal Ben Khedher
The main concern of current study is the analysis of entropy generation impact on incompressible boundary layer flow near an inclined rough rotating disk by assuming flow characteristic of Bingham plastic material. Variable fluid properties and radiative heat flux are considered under the entropy generation. We presented the solutions for fluid, heat and mass transfer phenomenon that causes large effect on Bingham plastic model. The similarity variables, first initiated by Von-Kàrmàn for viscous fluid is used for Bingham fluid which effectively converted boundary layer equations into ordinary differential equations. The RK-five approach, in conjunction with Cash and Karp, is used to get numerical solutions to the resulting equations. Next utilising the production data, the entropy data are explored by using theoretical and numerical approaches. Tables and figures are used to display the numerical results. The results reveals that the Bingham number reduces the base flow radial velocity and intensify the azimuthal velocity. The thermal and solutal Grashof numbers rises the both the azimuthal velocity. The increment in temperature distribution is observed due to radiation parameter and thermal conductivity coefficient. The augmentation in concentration region is observed due to thermal diffusion coefficient and Soret number. We concluded that numerical results calculated here show perfect description of Bingham fluid, mass and heat transfer features based on Soret and Dufour influence near an inclined rotating disk. Entropy generation increases with increase in the values of parameter, Bingham fluid plastic paramter , radiation parameter and parameter.
{"title":"Soret and Dufour effects of Bingham plastic fluid flow over a solar radiative heat flux","authors":"Mair Khan , T. Salahuddin , Muhammad Awais , Basem Al Awan , Muyassar Norberdiyeva , Nidhal Ben Khedher","doi":"10.1016/j.dynatmoce.2025.101600","DOIUrl":"10.1016/j.dynatmoce.2025.101600","url":null,"abstract":"<div><div>The main concern of current study is the analysis of entropy generation impact on incompressible boundary layer flow near an inclined rough rotating disk by assuming flow characteristic of Bingham plastic material. Variable fluid properties and radiative heat flux are considered under the entropy generation. We presented the solutions for fluid, heat and mass transfer phenomenon that causes large effect on Bingham plastic model. The similarity variables, first initiated by Von-Kàrmàn for viscous fluid is used for Bingham fluid which effectively converted boundary layer equations into ordinary differential equations. The RK-five approach, in conjunction with Cash and Karp, is used to get numerical solutions to the resulting equations. Next utilising the production data, the entropy data are explored by using theoretical and numerical approaches. Tables and figures are used to display the numerical results. The results reveals that the Bingham number reduces the base flow radial velocity and intensify the azimuthal velocity. The thermal and solutal Grashof numbers rises the both the azimuthal velocity. The increment in temperature distribution is observed due to radiation parameter and thermal conductivity coefficient. The augmentation in concentration region is observed due to thermal diffusion coefficient and Soret number. We concluded that numerical results calculated here show perfect description of Bingham fluid, mass and heat transfer features based on Soret and Dufour influence near an inclined rotating disk. Entropy generation increases with increase in the values of <span><math><msub><mrow><mi>α</mi></mrow><mrow><mn>1</mn></mrow></msub></math></span> parameter, Bingham fluid plastic paramter <span><math><mrow><mi>B</mi><mi>n</mi></mrow></math></span>, radiation <span><math><msub><mrow><mi>R</mi></mrow><mrow><mi>d</mi></mrow></msub></math></span> parameter and <span><math><mi>ξ</mi></math></span> parameter.</div></div>","PeriodicalId":50563,"journal":{"name":"Dynamics of Atmospheres and Oceans","volume":"112 ","pages":"Article 101600"},"PeriodicalIF":2.0,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145159474","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-01Epub Date: 2025-11-07DOI: 10.1016/j.dynatmoce.2025.101613
T. Salahuddin , Aqib Ali , Muhammad Awais , Mair Khan , Nissren Tamam , Nidhal Ben Khedher
A study is devoted to investigative a flow of Carreau Yasuda fluid flowing on the stretching cylindrical coordinate system along with variable temperature dependent thermal conductivity and concentration dependent thermal diffusivity. An Arrhenius-type reaction rate with activation energy is used to include the chemical process. The enthalpy change and double stratification are used to investigate thermal and solutal behaviors. Using the similarity transformation, the boundary layer governing equations and their related boundary conditions are converted into ordinary differential equations. The recognized numerical technique namely BVP4C method is used for the solutions of the mass concentration, boundary layer momentum and heat equations. Graphs shows the results of a study into the effect of different physical parameters. The results of current work leaves a remarkable impact in various industrial and engineering appliance. The improvement in power law index results decrease in the velocity of the fluid. The increment in the inputs of curvature parameter upsurges the velocity profile while the Weissenberg number and power law index marks the declining impression. The thermal field shows the incrementing behavior due to rising the Damkohler number, heat generation parameter, curvature parameter and thermal conduction coefficient while the decrement in the thermal response is observed due to thermal stratification parameter. The concentration profile declines due to solutal stratification parameter, Damkohler number, and activation energy coefficient, whereas increment is observed in field due to augmentation curvature parameter.
{"title":"Double layer stratifications of Carreau Yasuda fluid flow in cylindrical system along with activation energy","authors":"T. Salahuddin , Aqib Ali , Muhammad Awais , Mair Khan , Nissren Tamam , Nidhal Ben Khedher","doi":"10.1016/j.dynatmoce.2025.101613","DOIUrl":"10.1016/j.dynatmoce.2025.101613","url":null,"abstract":"<div><div>A study is devoted to investigative a flow of Carreau Yasuda fluid flowing on the stretching cylindrical coordinate system along with variable temperature dependent thermal conductivity and concentration dependent thermal diffusivity. An Arrhenius-type reaction rate with activation energy is used to include the chemical process. The enthalpy change and double stratification are used to investigate thermal and solutal behaviors. Using the similarity transformation, the boundary layer governing equations and their related boundary conditions are converted into ordinary differential equations. The recognized numerical technique namely BVP4C method is used for the solutions of the mass concentration, boundary layer momentum and heat equations. Graphs shows the results of a study into the effect of different physical parameters. The results of current work leaves a remarkable impact in various industrial and engineering appliance. The improvement in power law index <span><math><mi>n</mi></math></span> results decrease in the velocity of the fluid. The increment in the inputs of curvature parameter upsurges the velocity profile while the Weissenberg number and power law index marks the declining impression. The thermal field shows the incrementing behavior due to rising the Damkohler number, heat generation parameter, curvature parameter and thermal conduction coefficient while the decrement in the thermal response is observed due to thermal stratification parameter. The concentration profile declines due to solutal stratification parameter, Damkohler number, and activation energy coefficient, whereas increment is observed in field due to augmentation curvature parameter.</div></div>","PeriodicalId":50563,"journal":{"name":"Dynamics of Atmospheres and Oceans","volume":"112 ","pages":"Article 101613"},"PeriodicalIF":2.0,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145519640","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-01Epub Date: 2025-09-06DOI: 10.1016/j.dynatmoce.2025.101597
Cheikh Omar Tidjani Cissé , Anoumou Rene Tano , Emmanuel.K. Brempong , Adelaïde Taveneau , Rafael Almar , Donatus B. Angnuureng , Boubou Aldiouma Sy
In the face of rising in sea level due to climate change, the occurrence of extreme events such as storms is increasingly affecting coastal areas, particularly low-lying coasts. Knowledge of these phenomena is an important factor in mitigating the risk of coastal flooding and protecting coastal communities. The main objective of this study is to contribute to the understanding of the joint effect of changes in coastal extreme events and topographic subsidence on coastal flooding in Saint-Louis. As part of this process, we have quantified total water levels at the coast by using the regional sea level variation, ocean tide, surge, wind sea and swell waves data over the 1996–2021 period. All these datasets have been analyzed by Mann-Kendall statistical trend, the synthetic aperture radar (InSAR) interferometry technique, and the ‘zero side rule’ bathtub model. The results reveal a monotonic trend in total water levels on the Langue de Barbarie with the order of 0.049 m/yr the topographic subsidence varies from −6.4 to −0.4 mm/year. The spatialization of the flood wave reveals that the three spatial entities of Saint-Louis are extremely vulnerable to coastal flooding, but the extension of the flood wave is unevenly distributed at spatial scale. A comparison between the trend in maximum subsidence (-6.4 m/yr) and that in extreme mean water levels (0.049 m/yr) shows that the maximum trend in subsidence represents 13.06 % of the maximum trend in extreme coastal water level. This study enabled us to understand the influence of subsidence on flooding in Saint-Louis.
{"title":"Compounded influence of extreme coastal water level and subsidence on coastal flooding from satellite showcased at Saint-Louis (Senegal, West Africa)","authors":"Cheikh Omar Tidjani Cissé , Anoumou Rene Tano , Emmanuel.K. Brempong , Adelaïde Taveneau , Rafael Almar , Donatus B. Angnuureng , Boubou Aldiouma Sy","doi":"10.1016/j.dynatmoce.2025.101597","DOIUrl":"10.1016/j.dynatmoce.2025.101597","url":null,"abstract":"<div><div>In the face of rising in sea level due to climate change, the occurrence of extreme events such as storms is increasingly affecting coastal areas, particularly low-lying coasts. Knowledge of these phenomena is an important factor in mitigating the risk of coastal flooding and protecting coastal communities. The main objective of this study is to contribute to the understanding of the joint effect of changes in coastal extreme events and topographic subsidence on coastal flooding in Saint-Louis. As part of this process, we have quantified total water levels at the coast by using the regional sea level variation, ocean tide, surge, wind sea and swell waves data over the 1996–2021 period. All these datasets have been analyzed by Mann-Kendall statistical trend, the synthetic aperture radar (InSAR) interferometry technique, and the ‘zero side rule’ bathtub model. The results reveal a monotonic trend in total water levels on the Langue de Barbarie with the order of 0.049 m/yr the topographic subsidence varies from −6.4 to −0.4 mm/year. The spatialization of the flood wave reveals that the three spatial entities of Saint-Louis are extremely vulnerable to coastal flooding, but the extension of the flood wave is unevenly distributed at spatial scale. A comparison between the trend in maximum subsidence (-6.4 m/yr) and that in extreme mean water levels (0.049 m/yr) shows that the maximum trend in subsidence represents 13.06 % of the maximum trend in extreme coastal water level. This study enabled us to understand the influence of subsidence on flooding in Saint-Louis.</div></div>","PeriodicalId":50563,"journal":{"name":"Dynamics of Atmospheres and Oceans","volume":"112 ","pages":"Article 101597"},"PeriodicalIF":2.0,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145057277","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-01Epub Date: 2025-10-15DOI: 10.1016/j.dynatmoce.2025.101604
Robert G. Zakinyan, Andrey V. Chernyshov, Arthur R. Zakinyan
The paper proposes a mathematical model describing the propagation of internal inertial-gravity waves (IIGWs) in a stratified atmosphere. The necessity to propose a novel mathematical model stems from the fact that, as shown in the paper, the temperature disturbance field in the existing mathematical models depicting internal gravity waves (IGWs) in the incompressible fluid and anelastic gas approximations is not consistent with the temperature disturbance field derived from the heat conduction equation. In these models, the temperature field is obtained from the diagnostic Boussinesq relation, which states a direct proportionality between the density disturbance (or potential temperature disturbance) and the temperature disturbance. The temperature field in the compressible fluid approximation is consistent, yet it also describes the acoustic spectrum. In this paper, we propose a mathematical model describing the IIGWs in the compressible fluid approximation. In this model, the temperature field is consistent with the heat conduction equation, and the acoustic spectrum is absent. The paper also proposes a general mathematical model for the propagation of IIGWs in a baroclinic atmosphere. This model differs from the compressible fluid approximation in that the state of an air parcel is described not by the adiabatic equation, but by the Mendeleev–Clapeyron equation.
{"title":"Various approximations of mathematical models of planetary internal gravity waves in the f-plane approximation","authors":"Robert G. Zakinyan, Andrey V. Chernyshov, Arthur R. Zakinyan","doi":"10.1016/j.dynatmoce.2025.101604","DOIUrl":"10.1016/j.dynatmoce.2025.101604","url":null,"abstract":"<div><div>The paper proposes a mathematical model describing the propagation of internal inertial-gravity waves (IIGWs) in a stratified atmosphere. The necessity to propose a novel mathematical model stems from the fact that, as shown in the paper, the temperature disturbance field in the existing mathematical models depicting internal gravity waves (IGWs) in the incompressible fluid and anelastic gas approximations is not consistent with the temperature disturbance field derived from the heat conduction equation. In these models, the temperature field is obtained from the diagnostic Boussinesq relation, which states a direct proportionality between the density disturbance (or potential temperature disturbance) and the temperature disturbance. The temperature field in the compressible fluid approximation is consistent, yet it also describes the acoustic spectrum. In this paper, we propose a mathematical model describing the IIGWs in the compressible fluid approximation. In this model, the temperature field is consistent with the heat conduction equation, and the acoustic spectrum is absent. The paper also proposes a general mathematical model for the propagation of IIGWs in a baroclinic atmosphere. This model differs from the compressible fluid approximation in that the state of an air parcel is described not by the adiabatic equation, but by the Mendeleev–Clapeyron equation.</div></div>","PeriodicalId":50563,"journal":{"name":"Dynamics of Atmospheres and Oceans","volume":"112 ","pages":"Article 101604"},"PeriodicalIF":2.0,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145321505","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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