{"title":"PEDESTRIAN WIND COMFORT AT THE VICINITY OF A PLANNED HIGH-RISE BUILDING WITH VARYING SURROUNDS","authors":"Bartosz Kiesiewicz, A. Pistol, A. Flaga","doi":"10.2495/afm200151","DOIUrl":"https://doi.org/10.2495/afm200151","url":null,"abstract":"","PeriodicalId":23647,"journal":{"name":"WIT transactions on engineering sciences","volume":"21 1","pages":"163-174"},"PeriodicalIF":0.0,"publicationDate":"2020-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74171994","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The problem of sedimentation in surface waters has considerable implications for environmental protection, but also for the use of hydropower on the watercourse and for long-term planning of flood risk management and water management. For an efficient management of suspended sediments, it is necessary to carry out appropriate measurements in order to maintain the quantity and dynamics of sediment movement as a function of changing hydraulic conditions. The data collected on site are the input for the development of a suitable model that can be used to establish a long-term plan for sediment management and to calibrate the numerical models. The paper presents an analysis of suspended sediment measurements in a Slovenian river. A correlation between concentration and discharge was investigated, especially during flood event. The suspended sediment dynamics depends on energy conditions, i.e. material is transported during high discharge events and deposited during low flow. The model of the suspended sediment concentration is a function of the water runoff and the amount of sediment deposition. Different models should be used at low discharge and at high discharge to correctly predict the amount of transported sediment concentrations. When modelling flood events, an additional sediment supply term should be added to the rating curve.
{"title":"MEASUREMENT AND MODELING OF SUSPENDED SEDIMENT DYNAMICS IN WATERCOURSES","authors":"Janja Kramer Stajnko, R. Jecl, M. Perc","doi":"10.2495/afm200061","DOIUrl":"https://doi.org/10.2495/afm200061","url":null,"abstract":"The problem of sedimentation in surface waters has considerable implications for environmental protection, but also for the use of hydropower on the watercourse and for long-term planning of flood risk management and water management. For an efficient management of suspended sediments, it is necessary to carry out appropriate measurements in order to maintain the quantity and dynamics of sediment movement as a function of changing hydraulic conditions. The data collected on site are the input for the development of a suitable model that can be used to establish a long-term plan for sediment management and to calibrate the numerical models. The paper presents an analysis of suspended sediment measurements in a Slovenian river. A correlation between concentration and discharge was investigated, especially during flood event. The suspended sediment dynamics depends on energy conditions, i.e. material is transported during high discharge events and deposited during low flow. The model of the suspended sediment concentration is a function of the water runoff and the amount of sediment deposition. Different models should be used at low discharge and at high discharge to correctly predict the amount of transported sediment concentrations. When modelling flood events, an additional sediment supply term should be added to the rating curve.","PeriodicalId":23647,"journal":{"name":"WIT transactions on engineering sciences","volume":"31 1","pages":"61-67"},"PeriodicalIF":0.0,"publicationDate":"2020-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76910662","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
P. Vorobieff, N. Fathi, Seyed Sobhan Aleyasin, G. Ahmadi
Trajectories of a buoyant spherical solid particle in a linear shear flow were investigated at low Reynolds numbers. A two-dimensional CFD analysis was performed to simulate the solid-fluid flow. Our numerical model uses the discrete phase element method (DPM) to simulate the fluid domain and particle (solid phase) motion. The reliability of the computational results was evaluated for the particle trajectory acquired at the University of New Mexico’s stratified linear shear flow generator. The agreement between the numerical results with the experimental data is quantified.
{"title":"TRANSPORT OF A SINGLE SPHERICAL PARTICLE IN LOW REYNOLDS NUMBERS’ LINEAR SHEAR FLOWS: EXPERIMENT AND MODELING","authors":"P. Vorobieff, N. Fathi, Seyed Sobhan Aleyasin, G. Ahmadi","doi":"10.2495/afm200071","DOIUrl":"https://doi.org/10.2495/afm200071","url":null,"abstract":"Trajectories of a buoyant spherical solid particle in a linear shear flow were investigated at low Reynolds numbers. A two-dimensional CFD analysis was performed to simulate the solid-fluid flow. Our numerical model uses the discrete phase element method (DPM) to simulate the fluid domain and particle (solid phase) motion. The reliability of the computational results was evaluated for the particle trajectory acquired at the University of New Mexico’s stratified linear shear flow generator. The agreement between the numerical results with the experimental data is quantified.","PeriodicalId":23647,"journal":{"name":"WIT transactions on engineering sciences","volume":"281 1","pages":"69-76"},"PeriodicalIF":0.0,"publicationDate":"2020-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76804906","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this study a semi-circular cylinder at a wind incidence angle of 0° (rectilinear side parallel to the flow) has been adopted as a wind-excited bluff body for low-scale energy generation. This geometry has shown vortex-induced vibration (VIV) at low wind speeds and galloping excitation for higher values inside the studied range. The preliminary results of a wind tunnel campaign conducted using a sectional model of a semi-circular cylinder are reported and both VIV and galloping phenomena were identified, along with a relatively infrequent VIV-galloping interference case for the torsional degree of freedom. Based on these results, a prototype of an energy harvester has been designed and constructed. This prototype has also been studied by means of wind tunnel tests, obtaining the voltage output and the average power output for different wind speeds. Both VIV and galloping excitation were identified, finding that the power generation is larger for higher wind reduced speeds, as the prototype experiences galloping. For the prototype at 0° angle of attack, nondimensional amplitudes of oscillation up to 0.3 were measured, while the averaged power output reached 1700 μW. This work has signalled additional issues to consider for a throughout characterization of the harvester such as turbulent incoming flow or different angle of attack between the wind and the bluff body.
{"title":"EXPERIMENTAL STUDY FOR WIND ENERGY HARVESTING BASED ON THE AEROELASTIC EXCITATION OF A SEMI-CIRCULAR CYLINDER","authors":"Marina Lopez-Arias, F. Nieto, S. Hernández","doi":"10.2495/afm200131","DOIUrl":"https://doi.org/10.2495/afm200131","url":null,"abstract":"In this study a semi-circular cylinder at a wind incidence angle of 0° (rectilinear side parallel to the flow) has been adopted as a wind-excited bluff body for low-scale energy generation. This geometry has shown vortex-induced vibration (VIV) at low wind speeds and galloping excitation for higher values inside the studied range. The preliminary results of a wind tunnel campaign conducted using a sectional model of a semi-circular cylinder are reported and both VIV and galloping phenomena were identified, along with a relatively infrequent VIV-galloping interference case for the torsional degree of freedom. Based on these results, a prototype of an energy harvester has been designed and constructed. This prototype has also been studied by means of wind tunnel tests, obtaining the voltage output and the average power output for different wind speeds. Both VIV and galloping excitation were identified, finding that the power generation is larger for higher wind reduced speeds, as the prototype experiences galloping. For the prototype at 0° angle of attack, nondimensional amplitudes of oscillation up to 0.3 were measured, while the averaged power output reached 1700 μW. This work has signalled additional issues to consider for a throughout characterization of the harvester such as turbulent incoming flow or different angle of attack between the wind and the bluff body.","PeriodicalId":23647,"journal":{"name":"WIT transactions on engineering sciences","volume":"10 1","pages":"139-149"},"PeriodicalIF":0.0,"publicationDate":"2020-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77109208","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Flow properties and wake structures behind bluff bodies was one of the interesting topics between scholars for many years. Such interest in this phenomenon is due to various applications of bluff bodies in engineering and industry. In this study a comparison of flow structures of the wake of circular cylinder, semi-circular and c shape cylinders have been presented. The wake flows have been compared in terms of shedding frequency, Reynolds stress and turbulent kinetic energy (TKE) to identify any similarities between these geometries. It was found that the highest value of TKE occurred on either side of the separated shear layer. Moreover, it was observed that as the TKE develops in the downstream the peaks were shifted towards centerline in the wake region.
{"title":"COMPARISON OF TURBULENT KINETIC ENERGY IN THE WAKE REGION OF MODIFIED CIRCULAR CYLINDERS","authors":"Hamid Shiri, H. Hacisevki","doi":"10.2495/afm200041","DOIUrl":"https://doi.org/10.2495/afm200041","url":null,"abstract":"Flow properties and wake structures behind bluff bodies was one of the interesting topics between scholars for many years. Such interest in this phenomenon is due to various applications of bluff bodies in engineering and industry. In this study a comparison of flow structures of the wake of circular cylinder, semi-circular and c shape cylinders have been presented. The wake flows have been compared in terms of shedding frequency, Reynolds stress and turbulent kinetic energy (TKE) to identify any similarities between these geometries. It was found that the highest value of TKE occurred on either side of the separated shear layer. Moreover, it was observed that as the TKE develops in the downstream the peaks were shifted towards centerline in the wake region.","PeriodicalId":23647,"journal":{"name":"WIT transactions on engineering sciences","volume":"45 1","pages":"39-45"},"PeriodicalIF":0.0,"publicationDate":"2020-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82568327","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Grids at the inlet of the wind-tunnel test section have been commonly used to create turbulent conditions for model experiments concerning civil engineering applications. The parameters of the generated turbulence depend on the geometry of the grid and the distance from the grid to the measurement position. This work presents the experimental results of the grid-generated turbulence and a comparative analysis of an applicability of the von Kármán and Fichtl–McVehil autospectra models and autocorrelation methods (zero-crossing and exponential) for calculation of integral turbulence length scales. A square mesh array of rectangular bars was tested in a closed-circuit low velocity wind tunnel. The initial free stream turbulence was Iu = 0.75%. The measurements were carried out using the X-wire CTA probe installed at distances ranging from 1.35 m to 8.4 m downstream of the tested grid at velocities from 1.5 m/s to 9 m/s. The fitting suitability of various spectral models depends on the inflow velocity and turbulence intensity. Due to a greater flexibility and quantity of fitting coefficients, the Fichtl–McVehil model fits better in the area around the spectral peak at low flow velocity up to 3.4 m/s, while von Kármán models more accurately represent the measured spectrum at higher flow velocities. The methods based on using the correlation coefficients are equally suitable for flows at all measured velocities and turbulence intensities. The exponential method yields more stable distance-toscale characteristics with smaller deviations.
{"title":"COMPARISON OF TURBULENCE INTEGRAL LENGTH SCALE DETERMINATION METHODS","authors":"A. Trush, S. Pospíšil, H. Kozmar","doi":"10.2495/afm200111","DOIUrl":"https://doi.org/10.2495/afm200111","url":null,"abstract":"Grids at the inlet of the wind-tunnel test section have been commonly used to create turbulent conditions for model experiments concerning civil engineering applications. The parameters of the generated turbulence depend on the geometry of the grid and the distance from the grid to the measurement position. This work presents the experimental results of the grid-generated turbulence and a comparative analysis of an applicability of the von Kármán and Fichtl–McVehil autospectra models and autocorrelation methods (zero-crossing and exponential) for calculation of integral turbulence length scales. A square mesh array of rectangular bars was tested in a closed-circuit low velocity wind tunnel. The initial free stream turbulence was Iu = 0.75%. The measurements were carried out using the X-wire CTA probe installed at distances ranging from 1.35 m to 8.4 m downstream of the tested grid at velocities from 1.5 m/s to 9 m/s. The fitting suitability of various spectral models depends on the inflow velocity and turbulence intensity. Due to a greater flexibility and quantity of fitting coefficients, the Fichtl–McVehil model fits better in the area around the spectral peak at low flow velocity up to 3.4 m/s, while von Kármán models more accurately represent the measured spectrum at higher flow velocities. The methods based on using the correlation coefficients are equally suitable for flows at all measured velocities and turbulence intensities. The exponential method yields more stable distance-toscale characteristics with smaller deviations.","PeriodicalId":23647,"journal":{"name":"WIT transactions on engineering sciences","volume":"10 1","pages":"113-123"},"PeriodicalIF":0.0,"publicationDate":"2020-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73151232","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
X. Nogueira, Javier Fernández-Fidalgo, L. Ramírez, M. Deligant, S. Khelladi, J. Chassaing, F. Navarrina
In this work, a generalized framework for the numerical computations of the compressible Euler and Navier–Stokes equations is presented in order to increase the accuracy of any numerical scheme that uses a numerical flux that can be rewritten as a central term plus some dissipation term. The key idea is to regulate the numerical dissipation introduced by the scheme in real-time according to some estimate of the high-frequency content in the flow. This technique is called adaptive dissipation, and has been applied successfully to the calculation of incompressible turbulent flows. In the present case, and due to the compressibility effects, the methodology may present some stability problems, in order to remedy this behavior, we couple the adaptive dissipation methodology with an a posteriori procedure that guarantees that the solution remains physical at all times. We validate the proposed methodology with a finite volume and a finite difference scheme, with some oneand three-dimensional test cases, obtaining solutions that are physical and in really good agreement with the ones that can be found in the literature.
{"title":"A POSTERIORI METHODS WITH AUTOMATIC DISSIPATION ADJUSTMENT FOR THE SIMULATION OF COMPRESSIBLE FLOWS","authors":"X. Nogueira, Javier Fernández-Fidalgo, L. Ramírez, M. Deligant, S. Khelladi, J. Chassaing, F. Navarrina","doi":"10.2495/afm200011","DOIUrl":"https://doi.org/10.2495/afm200011","url":null,"abstract":"In this work, a generalized framework for the numerical computations of the compressible Euler and Navier–Stokes equations is presented in order to increase the accuracy of any numerical scheme that uses a numerical flux that can be rewritten as a central term plus some dissipation term. The key idea is to regulate the numerical dissipation introduced by the scheme in real-time according to some estimate of the high-frequency content in the flow. This technique is called adaptive dissipation, and has been applied successfully to the calculation of incompressible turbulent flows. In the present case, and due to the compressibility effects, the methodology may present some stability problems, in order to remedy this behavior, we couple the adaptive dissipation methodology with an a posteriori procedure that guarantees that the solution remains physical at all times. We validate the proposed methodology with a finite volume and a finite difference scheme, with some oneand three-dimensional test cases, obtaining solutions that are physical and in really good agreement with the ones that can be found in the literature.","PeriodicalId":23647,"journal":{"name":"WIT transactions on engineering sciences","volume":"50 1","pages":"3-12"},"PeriodicalIF":0.0,"publicationDate":"2020-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86679020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
J. Quintela, J. A. Jurado, C. Rapela, A. J. Álvarez, S. Hernández
Sometimes slender structures are reinforced with mechanical dampers to reduce the vibrations caused by aeroelastic phenomena like flutter. However the formulation of flutter analysis only considers the classical damping ratio to take into account the structural damping. This paper explains the procedure used for adding mechanical dampers with a known constant to the analysis software FLAS. This code was developed at Universidade da Coruña to calculate the critical wind speed for flutter instability. An example of a solar tracker with two rows of flat panels is shown. In this slender structure two mechanical dampers are used to reduce the vibrations caused by the wind in structure interaction. The solar tracker has been studied for five different positions of the angle of attack. Results of flutter speed for several values of the dampers constant and global structural damping ratio are presented.
有时细长的结构用机械阻尼器加固，以减少颤振等气动弹性现象引起的振动。然而，颤振分析的公式只考虑经典阻尼比来考虑结构阻尼。本文介绍了在分析软件FLAS中加入已知常数的机械阻尼器的程序。这个程序是由universsidade da Coruña开发的，用于计算颤振失稳的临界风速。图中展示了一种带有两排平板的太阳能跟踪器。在这种细长结构中，采用两个机械阻尼器来减小风在结构相互作用中引起的振动。研究了五种不同迎角位置的太阳跟踪器。给出了阻尼器常数和结构整体阻尼比不同取值下颤振速度的计算结果。
{"title":"INCLUSION OF MECHANICAL DAMPERS IN THE MULTIMODAL FLUTTER ANALYSIS OF SLENDER STRUCTURES","authors":"J. Quintela, J. A. Jurado, C. Rapela, A. J. Álvarez, S. Hernández","doi":"10.2495/afm200121","DOIUrl":"https://doi.org/10.2495/afm200121","url":null,"abstract":"Sometimes slender structures are reinforced with mechanical dampers to reduce the vibrations caused by aeroelastic phenomena like flutter. However the formulation of flutter analysis only considers the classical damping ratio to take into account the structural damping. This paper explains the procedure used for adding mechanical dampers with a known constant to the analysis software FLAS. This code was developed at Universidade da Coruña to calculate the critical wind speed for flutter instability. An example of a solar tracker with two rows of flat panels is shown. In this slender structure two mechanical dampers are used to reduce the vibrations caused by the wind in structure interaction. The solar tracker has been studied for five different positions of the angle of attack. Results of flutter speed for several values of the dampers constant and global structural damping ratio are presented.","PeriodicalId":23647,"journal":{"name":"WIT transactions on engineering sciences","volume":"53 1","pages":"125-135"},"PeriodicalIF":0.0,"publicationDate":"2020-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86173771","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ABSTRACT As Korean society has become more advanced, recent disasters have become more complex, especially when they occur simultaneously with natural disasters. As part of the efforts to cope effectively with a diverse range of disasters, the efficiency of disaster response operations has been reconsidered and ways to improve existing disaster management processes have been investigated. Currently, disaster operations in South Korea are carried out in accordance with type-specific disaster manuals. Although disaster management based on manuals can guarantee clarity and legitimacy, limitations include poor reporting and feedback during disaster operations, difficulty disseminating disaster information, and ineffective training in disaster prevention and preparedness. To overcome these limitations, this study sought to effectively improve disaster services by synthesizing disaster information, which has become much more detailed and accessible due to the development of information technology, with disaster management processes. The research process was as follows: (1) Collect disaster-related keywords for earthquakes in Korea, which have recently become an issue; (2) Evaluate the suitability of the collected disaster-related keywords by conducting a survey of individuals in charge of disaster operations and those in charge of disaster information; (3) Use the results of the survey to associate the disaster-related keywords with the individual disaster management stages; (4) Develop a disaster operation process based on a keyword matrix; and (5) Present a disaster support system model that can effectively express the link between the disaster management stages and disaster-related keywords. This system enables those in charge of disaster response operations to construct a system model for disaster service support that effectively accesses disaster-related keywords that are collected and analysed based on various disaster service characteristics.
{"title":"IMPROVING DISASTER RESPONSE PROCESSES USING KEYWORDS SPECIFICALLY FOR EARTHQUAKES","authors":"Jaehwang Ahn, Yu-Leuk Choi, Byungsik Kim, J. Yi","doi":"10.2495/risk200151","DOIUrl":"https://doi.org/10.2495/risk200151","url":null,"abstract":"ABSTRACT As Korean society has become more advanced, recent disasters have become more complex, especially when they occur simultaneously with natural disasters. As part of the efforts to cope effectively with a diverse range of disasters, the efficiency of disaster response operations has been reconsidered and ways to improve existing disaster management processes have been investigated. Currently, disaster operations in South Korea are carried out in accordance with type-specific disaster manuals. Although disaster management based on manuals can guarantee clarity and legitimacy, limitations include poor reporting and feedback during disaster operations, difficulty disseminating disaster information, and ineffective training in disaster prevention and preparedness. To overcome these limitations, this study sought to effectively improve disaster services by synthesizing disaster information, which has become much more detailed and accessible due to the development of information technology, with disaster management processes. The research process was as follows: (1) Collect disaster-related keywords for earthquakes in Korea, which have recently become an issue; (2) Evaluate the suitability of the collected disaster-related keywords by conducting a survey of individuals in charge of disaster operations and those in charge of disaster information; (3) Use the results of the survey to associate the disaster-related keywords with the individual disaster management stages; (4) Develop a disaster operation process based on a keyword matrix; and (5) Present a disaster support system model that can effectively express the link between the disaster management stages and disaster-related keywords. This system enables those in charge of disaster response operations to construct a system model for disaster service support that effectively accesses disaster-related keywords that are collected and analysed based on various disaster service characteristics.","PeriodicalId":23647,"journal":{"name":"WIT transactions on engineering sciences","volume":"24 1","pages":"169-180"},"PeriodicalIF":0.0,"publicationDate":"2020-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72979696","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Flooding is one of the most commonly occurring natural hazards worldwide. Mapping and evaluation of potential flood hazards are vital parts of flood risk assessment and mitigation. This study focuses on predicting the coastal flood susceptibility area in Muscat Governorate, Sultanate of Oman. First, it is assumed that the occurrence of a hazard can be determined based on the indicators influencing it. Thus, four indicators were selected and classified into five classes based on their contribution to flood hazard probability; these include ground elevation, slope degree, soil hydrologic group, and distance from the coast. Then, the entropy weighted method was applied to calculate the weights of given indicators in influencing flood hazards. The results were finally aggregated into ArcGIS software and the produced maps were reclassified into five coastal flood susceptibility zones. The results show that the soil indicator has the highest rate of weight in Wilayats Bawshar, Muttrah, Muscat and Qurayyat. While the elevation indicator has the highest rate of flood hazard in Wilayat AlSeeb. The weight results were used then for calculation of flood hazard index which was then classified into five classes of flood hazard susceptibility zones. The results of this work will be very useful in pursuing work on assessing the potential of multiple hazard risk interactions. It is essential to include certain indicators such as land use and land cover in future work, as they play a major role in water infiltration and runoff behaviour.
{"title":"SPATIAL PREDICTION OF COASTAL FLOOD-SUSCEPTIBLE AREAS IN MUSCAT GOVERNORATE USING AN ENTROPY WEIGHTED METHOD","authors":"H. Al-Hinai, R. Abdalla","doi":"10.2495/risk200111","DOIUrl":"https://doi.org/10.2495/risk200111","url":null,"abstract":"Flooding is one of the most commonly occurring natural hazards worldwide. Mapping and evaluation of potential flood hazards are vital parts of flood risk assessment and mitigation. This study focuses on predicting the coastal flood susceptibility area in Muscat Governorate, Sultanate of Oman. First, it is assumed that the occurrence of a hazard can be determined based on the indicators influencing it. Thus, four indicators were selected and classified into five classes based on their contribution to flood hazard probability; these include ground elevation, slope degree, soil hydrologic group, and distance from the coast. Then, the entropy weighted method was applied to calculate the weights of given indicators in influencing flood hazards. The results were finally aggregated into ArcGIS software and the produced maps were reclassified into five coastal flood susceptibility zones. The results show that the soil indicator has the highest rate of weight in Wilayats Bawshar, Muttrah, Muscat and Qurayyat. While the elevation indicator has the highest rate of flood hazard in Wilayat AlSeeb. The weight results were used then for calculation of flood hazard index which was then classified into five classes of flood hazard susceptibility zones. The results of this work will be very useful in pursuing work on assessing the potential of multiple hazard risk interactions. It is essential to include certain indicators such as land use and land cover in future work, as they play a major role in water infiltration and runoff behaviour.","PeriodicalId":23647,"journal":{"name":"WIT transactions on engineering sciences","volume":"9 1","pages":"121-133"},"PeriodicalIF":0.0,"publicationDate":"2020-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88671735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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