The modelling of catchment-based instead of local demand and optimal instead of sub-optimal character (i.e., locational configuration) of service delivery systems, commonly done in Floating Catchment Area (FCA) measures, generate spatial accessibility indices that might be misleading. The ability of recent FCA measures, three-step (3S) FCA, Modified (M) two-step (2S) FCA, and Balanced (B) FCA to capture local demand and locational configuration was examined in hypothetical systems and Rural Wards of Dodoma Urban District and found to be less appealing. The resulting 3SFCA, M2SFCA, and BFCA spatial accessibility indices inconsistently varied with the local demand or locational configuration. Thus, the study proposed a Modified (M) 3SFCA measure to effectively capture local demand and locational configuration. The proposed M3SFCA measure was implemented in hypothetical systems and Rural Wards of Dodoma Urban District and found to generate spatial accessibility indices that logically varied with local demand and locational configuration. The service users (or households) with low local demand or closer to service providers (or water points) are characterized by higher spatial accessibility indices and vice versa. This characterization of spatial accessibility indices is more realistic and essential for effective monitoring of progress made on the global and national development goals.
{"title":"Modelling Local Demand and Locational Configuration in Floating Catchment Area Measures of Spatial Accessibility","authors":"F. Mahuve, Beatrice Tarimo","doi":"10.30897/ijegeo.1332292","DOIUrl":"https://doi.org/10.30897/ijegeo.1332292","url":null,"abstract":"The modelling of catchment-based instead of local demand and optimal instead of sub-optimal character (i.e., locational configuration) of service delivery systems, commonly done in Floating Catchment Area (FCA) measures, generate spatial accessibility indices that might be misleading. The ability of recent FCA measures, three-step (3S) FCA, Modified (M) two-step (2S) FCA, and Balanced (B) FCA to capture local demand and locational configuration was examined in hypothetical systems and Rural Wards of Dodoma Urban District and found to be less appealing. The resulting 3SFCA, M2SFCA, and BFCA spatial accessibility indices inconsistently varied with the local demand or locational configuration. Thus, the study proposed a Modified (M) 3SFCA measure to effectively capture local demand and locational configuration. The proposed M3SFCA measure was implemented in hypothetical systems and Rural Wards of Dodoma Urban District and found to generate spatial accessibility indices that logically varied with local demand and locational configuration. The service users (or households) with low local demand or closer to service providers (or water points) are characterized by higher spatial accessibility indices and vice versa. This characterization of spatial accessibility indices is more realistic and essential for effective monitoring of progress made on the global and national development goals.","PeriodicalId":492501,"journal":{"name":"International journal of environment and geoinformatics","volume":" 50","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138962251","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 atmosphere is being disturbed by an increase in the concentration of greenhouse gases, resulting in severe global warming and related effects. Each day, more comparable carbon dioxide is released into the atmosphere because of industrial processes, transportation, animal activities, lighting, cooking, heating, and illumination. The term "carbon footprint" refers to the number of greenhouse gases that a person, a nation, or an organization emits because of their activities. The methodologies for calculating carbon footprints are still being developed, but they are becoming a vital tool for managing greenhouse gases. This review article discusses the carbon footprint, measurement methods, and other important information. In the future, it is critical to keep developing and enhancing techniques for evaluating the environmental effect, including creating more thorough and consistent systems for computing carbon footprints. To develop a more comprehensive understanding of the environmental impact of human activities, it will also be crucial to consider environmental effects other than greenhouse gas emissions. These actions will ultimately be essential for reducing the impact of climate change and maintaining the health and well-being of our planet.
{"title":"From Emissions to Environmental Impact: Understanding the Carbon Footprint","authors":"A. Çelekli, Özgür Eren Zari̇ç","doi":"10.30897/ijegeo.1383311","DOIUrl":"https://doi.org/10.30897/ijegeo.1383311","url":null,"abstract":"The atmosphere is being disturbed by an increase in the concentration of greenhouse gases, resulting in severe global warming and related effects. Each day, more comparable carbon dioxide is released into the atmosphere because of industrial processes, transportation, animal activities, lighting, cooking, heating, and illumination. The term \"carbon footprint\" refers to the number of greenhouse gases that a person, a nation, or an organization emits because of their activities. The methodologies for calculating carbon footprints are still being developed, but they are becoming a vital tool for managing greenhouse gases. This review article discusses the carbon footprint, measurement methods, and other important information. In the future, it is critical to keep developing and enhancing techniques for evaluating the environmental effect, including creating more thorough and consistent systems for computing carbon footprints. To develop a more comprehensive understanding of the environmental impact of human activities, it will also be crucial to consider environmental effects other than greenhouse gas emissions. These actions will ultimately be essential for reducing the impact of climate change and maintaining the health and well-being of our planet.","PeriodicalId":492501,"journal":{"name":"International journal of environment and geoinformatics","volume":"24 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138965774","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}
Subsoil engineering site condition and modeling of engineering parameters has been carried out in Ile Oluji, Ondo State, Southwestern Nigeria, using geotechnical investigation, geophysical method, borehole logging, groundwater level measurement, and laboratory studies. Findings revealed that the soils are clayey of low-high plasticity/compressibility, with AASHTO classification of A-7-6. Based on average values of cohesion (48.4 KN/m2), angle of friction (17.4°), unconfined compressive strength (186.8 KN/m2), coefficient of permeability (2.13E-06 cm/s), activity (0.48), soaked CBR (7 %), MDD/OMC (1980 kg/m3/14.8 %), plasticity index (20.2 %), group index (6 %), compression index (0.0443), coefficient of volume compressibility (0.2041 m2/KN), depth to basement rock (22.2 m), static water levels 5.5 m (in well) and 21.8 m (in borehole), the soil is unsuitable for highway subgrade, subbase, and base courses. Thus, if it is expedient to use it as subgrade soil, the minimum recommended thickness is 241 – 513 mm (avg. 395 mm). The average allowable bearing capacity of the soil for square and round foundations are 268.4 KN/m2 and 267.95 KN/m2 respectively, with average total settlement of 18.3 mm for structural pressure of 100 KN/m2. For embankment, the suitability index (1.21) of the soil suggests a fair/expanding not collapsible construction material. The rock units in the area have high compressive/shear strength, modulus of elasticity, high crushing strength, low deformability; and presumable bearing capacity of 8, 000 – 10, 000 KPa when fresh, and 5000 – 7000 KPa when partly or slightly weathered. Thus are valuable as foundation constructions, aggregate in pavement, building stone, and armourstones. The correlation coefficient of the parameters are: MDD/PI vs. CBR (0.0043), LL vs. coefficient of consolidation (0.0608), PI vs. undrained shear strength/effective overburden (0.2706), PI vs. angle of shearing (0.0117), dry density vs. angle of shearing (0.0058), suitability index vs. CBRs (0.3644), clay contents vs. PI (0.1355).
{"title":"Application of Geoinformatics in Civil Engineering Design and Construction: A Case Study of Ile Oluji, SW Nigeria","authors":"O. Falowo","doi":"10.30897/ijegeo.1262020","DOIUrl":"https://doi.org/10.30897/ijegeo.1262020","url":null,"abstract":"Subsoil engineering site condition and modeling of engineering parameters has been carried out in Ile Oluji, Ondo State, Southwestern Nigeria, using geotechnical investigation, geophysical method, borehole logging, groundwater level measurement, and laboratory studies. Findings revealed that the soils are clayey of low-high plasticity/compressibility, with AASHTO classification of A-7-6. Based on average values of cohesion (48.4 KN/m2), angle of friction (17.4°), unconfined compressive strength (186.8 KN/m2), coefficient of permeability (2.13E-06 cm/s), activity (0.48), soaked CBR (7 %), MDD/OMC (1980 kg/m3/14.8 %), plasticity index (20.2 %), group index (6 %), compression index (0.0443), coefficient of volume compressibility (0.2041 m2/KN), depth to basement rock (22.2 m), static water levels 5.5 m (in well) and 21.8 m (in borehole), the soil is unsuitable for highway subgrade, subbase, and base courses. Thus, if it is expedient to use it as subgrade soil, the minimum recommended thickness is 241 – 513 mm (avg. 395 mm). The average allowable bearing capacity of the soil for square and round foundations are 268.4 KN/m2 and 267.95 KN/m2 respectively, with average total settlement of 18.3 mm for structural pressure of 100 KN/m2. For embankment, the suitability index (1.21) of the soil suggests a fair/expanding not collapsible construction material. The rock units in the area have high compressive/shear strength, modulus of elasticity, high crushing strength, low deformability; and presumable bearing capacity of 8, 000 – 10, 000 KPa when fresh, and 5000 – 7000 KPa when partly or slightly weathered. Thus are valuable as foundation constructions, aggregate in pavement, building stone, and armourstones. The correlation coefficient of the parameters are: MDD/PI vs. CBR (0.0043), LL vs. coefficient of consolidation (0.0608), PI vs. undrained shear strength/effective overburden (0.2706), PI vs. angle of shearing (0.0117), dry density vs. angle of shearing (0.0058), suitability index vs. CBRs (0.3644), clay contents vs. PI (0.1355).","PeriodicalId":492501,"journal":{"name":"International journal of environment and geoinformatics","volume":"49 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138967671","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}
Sandy coasts are constantly exposed to rapid coastal change. Projected climate change caused by Changes in sea level rise, wave circumstances, and storm occurrences will increase erosion rates, exposing these areas to increasingly hazardous conditions. For coastal management purposes, it is important to monitor and measure these changes. Erosion of sandy and pebbly beaches and their ecosystems. The loss of sand and gravel is not only due to the rise in sea level and the force of waves resulting from storms, which will intensify due to climate change. There is a new important factor of human intervention and impact on the beaches that must be mentioned and verified as to how the effect is in the long term with the increase in tourism in the coastal areas, especially in areas of a tourist nature. The amount of sediment that each individual transports from the coastal beaches in the Alanya region. In the experiment, we Collected samples of sand and gravel from different locations on the coast to be surveyed. Classifying the collected samples by means of sieve analysis. Executing the project by going to the sites of sand samples that were analyzed in different periods by collecting samples (collecting sand attached to the bodies of people of different sizes in basins Testing). The thesis also answers Identify the eroded beach by relating the average number of locals and foreigners who come to the project area for a year and use the coast with the data collected during the project.
{"title":"Tourism impact on coastal erosion: a case of Alanya","authors":"Mulhem ABDUL RAZAK, R. Ghasemlounia, M. Aksel","doi":"10.30897/ijegeo.1287569","DOIUrl":"https://doi.org/10.30897/ijegeo.1287569","url":null,"abstract":"Sandy coasts are constantly exposed to rapid coastal change. Projected climate change caused by Changes in sea level rise, wave circumstances, and storm occurrences will increase erosion rates, exposing these areas to increasingly hazardous conditions. For coastal management purposes, it is important to monitor and measure these changes. Erosion of sandy and pebbly beaches and their ecosystems. The loss of sand and gravel is not only due to the rise in sea level and the force of waves resulting from storms, which will intensify due to climate change. There is a new important factor of human intervention and impact on the beaches that must be mentioned and verified as to how the effect is in the long term with the increase in tourism in the coastal areas, especially in areas of a tourist nature. The amount of sediment that each individual transports from the coastal beaches in the Alanya region. \u0000In the experiment, we Collected samples of sand and gravel from different locations on the coast to be surveyed. Classifying the collected samples by means of sieve analysis. Executing the project by going to the sites of sand samples that were analyzed in different periods by collecting samples (collecting sand attached to the bodies of people of different sizes in basins Testing). The thesis also answers Identify the eroded beach by relating the average number of locals and foreigners who come to the project area for a year and use the coast with the data collected during the project.","PeriodicalId":492501,"journal":{"name":"International journal of environment and geoinformatics","volume":"56 16","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139006852","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}
Elif DEMİR ÖZBEK, T. Yomralioglu, Serpil ATEŞ AYDAR
Due to their complex nature, disasters and emergencies require a data-intensive management system in which many actors from different sectors participate and simultaneous processes are managed. Due to this complexity, there are problems in managing and sharing process services and geographic data effectively. The key to solving these problems is the introduction of a complete interoperability model. In this context, interoperability models based on existing international standards are analyzed in this study. FEI and EIF models are taken as basis in terms of disaster and emergency management interoperability requirements. Accordingly, the interoperability reference model was created in legal, organizational, semantic and technical frameworks to meet the interoperability levels. This general framework model has been evaluated in the service and data layers that need to be fully defined in disaster and emergency management phases, and a basic model including interoperability solutions for the service and data model has been created.
{"title":"Development of Interoperability Principles for Disaster and Emergency Management System of Türkiye","authors":"Elif DEMİR ÖZBEK, T. Yomralioglu, Serpil ATEŞ AYDAR","doi":"10.30897/ijegeo.1396579","DOIUrl":"https://doi.org/10.30897/ijegeo.1396579","url":null,"abstract":"Due to their complex nature, disasters and emergencies require a data-intensive management system in which many actors from different sectors participate and simultaneous processes are managed. Due to this complexity, there are problems in managing and sharing process services and geographic data effectively. The key to solving these problems is the introduction of a complete interoperability model. In this context, interoperability models based on existing international standards are analyzed in this study. FEI and EIF models are taken as basis in terms of disaster and emergency management interoperability requirements. Accordingly, the interoperability reference model was created in legal, organizational, semantic and technical frameworks to meet the interoperability levels. This general framework model has been evaluated in the service and data layers that need to be fully defined in disaster and emergency management phases, and a basic model including interoperability solutions for the service and data model has been created.","PeriodicalId":492501,"journal":{"name":"International journal of environment and geoinformatics","volume":"14 13","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139010488","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}
Mehmet Emre ÇETİNTASOGLU, Nuray ÇAĞLAR, Özgül KELEŞ
In this study, thermochemical conversion of mussel shells as biological waste utilizations has been made as a protection layer for cathode active materials. LiCoO2 material synthesized via sol-gel method and coated with CaO produced using mussel shells. An appropriate coating ratio enhances the cycling performance with a better specific capacity (170 mAh g-1 at 1C). Surface modification plays a crucial role in attaining an improved performance of LCO by reducing its interference between electrolytes. This study present the use of biological waste mussel shell as decoration agent for cathode active materials and lead up to decrease the amount of biological wastes.
本研究将贻贝热化学转化为生物废弃物利用，作为正极活性材料的保护层。溶胶-凝胶法制备LiCoO2材料，并包覆以贻贝制备的CaO。适当的涂层比例可以提高循环性能，具有更好的比容量(1C时为170 mAh g-1)。表面改性通过减少电解质之间的干扰，对LCO性能的改善起着至关重要的作用。本研究提出利用生物废弃贻贝作为阴极活性材料的装饰剂，以减少生物废弃物的产生。
{"title":"Utilization of Bio-waste Mussel Shell as a Decoration Material on LiCoO2 Cathode.","authors":"Mehmet Emre ÇETİNTASOGLU, Nuray ÇAĞLAR, Özgül KELEŞ","doi":"10.30897/ijegeo.1367737","DOIUrl":"https://doi.org/10.30897/ijegeo.1367737","url":null,"abstract":"In this study, thermochemical conversion of mussel shells as biological waste utilizations has been made as a protection layer for cathode active materials. LiCoO2 material synthesized via sol-gel method and coated with CaO produced using mussel shells. An appropriate coating ratio enhances the cycling performance with a better specific capacity (170 mAh g-1 at 1C). Surface modification plays a crucial role in attaining an improved performance of LCO by reducing its interference between electrolytes. This study present the use of biological waste mussel shell as decoration agent for cathode active materials and lead up to decrease the amount of biological wastes.","PeriodicalId":492501,"journal":{"name":"International journal of environment and geoinformatics","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135918098","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}
Mustafa UTLU, Muhammed Zeynel ÖZTÜRK, Mesut ŞİMŞEK, Mehmet Fatih AKGÜMÜŞ
Hacıabdullah village, where rockfall events occur frequently, is an important mountainous region located within the boundaries of Niğde province, which is one of the top provinces in Türkiye in terms of rockfall events and is located in the Central Anatolia Region. Despite the frequent occurrence of many rockfall events of varying sizes, no precautions are taken as a result of these events, leading to economic damages. Therefore, Hacıabdullah village, which poses a high danger and risk in terms of slope instability and rockfall potential, has been selected as the study area. The study aims to evaluate rockfall events occurring on steep slopes in Haciabullah village, based on the potential rock blocks that could fall, by modeling them according to their geometries. Within this scope, the potential 17 rock blocks that could fall have been identified in the field and modelled using RAMMS 3D rockfall software according to their geometric characteristics. In addition to the geometric characteristics of the rock blocks, their potential falling areas, velocities, jump heights, and kinetic energies will also be determined, the basis of the rockfall hazard analysis. For the 3D modeling of the study, UAV-DSM (3cm resolution), which represents the high-resolution surface of the topography, has been used as the main dataset. As a result of 3D rockfall modeling, the maximum kinetic energy, maximum velocity, and maximum jump height of the falling blocks reached 3476 kJ, 23.1 m/s, and 14.57 m, respectively. The result of the kinematic analysis showed a higher probability of toppling type in the whole study area. Rocks that do not move very far from the source area are; in other words and may significantly damage the roads. However, rolling blocks, in other words, blocks that can travel long distances from the source area, have the potential to cause great damage to the settlement areas, roads, and trees. According to the hazard map, blocks involve high and moderate levels of risk for settlement units.
{"title":"Evaluation of rockfall hazard based on UAV technology and 3D Rockfall Simulations","authors":"Mustafa UTLU, Muhammed Zeynel ÖZTÜRK, Mesut ŞİMŞEK, Mehmet Fatih AKGÜMÜŞ","doi":"10.30897/ijegeo.1323768","DOIUrl":"https://doi.org/10.30897/ijegeo.1323768","url":null,"abstract":"Hacıabdullah village, where rockfall events occur frequently, is an important mountainous region located within the boundaries of Niğde province, which is one of the top provinces in Türkiye in terms of rockfall events and is located in the Central Anatolia Region. Despite the frequent occurrence of many rockfall events of varying sizes, no precautions are taken as a result of these events, leading to economic damages. Therefore, Hacıabdullah village, which poses a high danger and risk in terms of slope instability and rockfall potential, has been selected as the study area. The study aims to evaluate rockfall events occurring on steep slopes in Haciabullah village, based on the potential rock blocks that could fall, by modeling them according to their geometries. Within this scope, the potential 17 rock blocks that could fall have been identified in the field and modelled using RAMMS 3D rockfall software according to their geometric characteristics. In addition to the geometric characteristics of the rock blocks, their potential falling areas, velocities, jump heights, and kinetic energies will also be determined, the basis of the rockfall hazard analysis. For the 3D modeling of the study, UAV-DSM (3cm resolution), which represents the high-resolution surface of the topography, has been used as the main dataset. As a result of 3D rockfall modeling, the maximum kinetic energy, maximum velocity, and maximum jump height of the falling blocks reached 3476 kJ, 23.1 m/s, and 14.57 m, respectively. The result of the kinematic analysis showed a higher probability of toppling type in the whole study area. Rocks that do not move very far from the source area are; in other words and may significantly damage the roads. However, rolling blocks, in other words, blocks that can travel long distances from the source area, have the potential to cause great damage to the settlement areas, roads, and trees. According to the hazard map, blocks involve high and moderate levels of risk for settlement units.","PeriodicalId":492501,"journal":{"name":"International journal of environment and geoinformatics","volume":"146 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136295190","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}
Located in western Anatolia (Turkey), Lake Marmara is a wetland with high ecological value. Lake Marmara, which was exposed to intense anthropogenic effects after 1940, is experiencing ecological deterioration in recent years. This study aimed to analyze the ecological risk level of the lake by using Enrichment Factor (EF), Toxic Risk Index (TRI), Modified Potential Ecological Risk Index (mER) etc. The research hypothesized that the discharge of water from the Gediz River and Kum Stream to the lake after 1940 triggered ecological risk problems. Moderate toxic risk, low potential ecological risk, moderate element contamination were detected throughout the lake. It was determined that Mo, P and Hg of anthropogenic origin and As, Ni, Cr, Cu of lithological origin created ecological risk at a regional scale. Domestic-industrial wastes and agriculture in the Gediz River basin and around the lake were identified as the dominant anthropogenic activity. The temporal variation of the ecological risk indices based on the elements did not reflect the anthropogenic traces of water discharge into the lake from the Gediz River basin. However, the temporal variation of TOC, N, P and CDP showed the effects of anthropogenic interventions in the lake. According to the threshold values; P is highly contaminated and N is close to the severely contaminated limit. The findings, while confirming the research hypothesis, showed that the dominant ecological risk factor in Lake Marmara is not elemental contamination, but organic pollutants, nitrogen and phosphate.
{"title":"GIS Analysis of spatial-temporal variation of the ecological risk caused by element and organic pollutants in Lake Marmara (Turkey)","authors":"Şakir FURAL","doi":"10.30897/ijegeo.1336939","DOIUrl":"https://doi.org/10.30897/ijegeo.1336939","url":null,"abstract":"Located in western Anatolia (Turkey), Lake Marmara is a wetland with high ecological value. Lake Marmara, which was exposed to intense anthropogenic effects after 1940, is experiencing ecological deterioration in recent years. This study aimed to analyze the ecological risk level of the lake by using Enrichment Factor (EF), Toxic Risk Index (TRI), Modified Potential Ecological Risk Index (mER) etc. The research hypothesized that the discharge of water from the Gediz River and Kum Stream to the lake after 1940 triggered ecological risk problems. Moderate toxic risk, low potential ecological risk, moderate element contamination were detected throughout the lake. It was determined that Mo, P and Hg of anthropogenic origin and As, Ni, Cr, Cu of lithological origin created ecological risk at a regional scale. Domestic-industrial wastes and agriculture in the Gediz River basin and around the lake were identified as the dominant anthropogenic activity. The temporal variation of the ecological risk indices based on the elements did not reflect the anthropogenic traces of water discharge into the lake from the Gediz River basin. However, the temporal variation of TOC, N, P and CDP showed the effects of anthropogenic interventions in the lake. According to the threshold values; P is highly contaminated and N is close to the severely contaminated limit. The findings, while confirming the research hypothesis, showed that the dominant ecological risk factor in Lake Marmara is not elemental contamination, but organic pollutants, nitrogen and phosphate.","PeriodicalId":492501,"journal":{"name":"International journal of environment and geoinformatics","volume":"2013 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136272245","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}
Naghmeh HEİDARİ, Murat AKSEL, Oral YAĞCI, Manousos VALYRAKİS
Midchannel islands (MCIs) are instream geomorphic units generally emerge in lowland rivers. Despite their significant ecomorphological services in the river ecosystem, the flow patterns around these self-forming riparian landforms and their impacts on aquatic life are not fully understood yet. Understanding the flow pattern around these formations enables practitioners to produce cost-effective, sustainable, and eco-friendly river management projects and strategies, forming the motivation of this study. Herein, the secondary flow pattern around MCIs was analyzed by employing a RANS-based numerical model. Flow around the simplified bodies was simulated to give a more precise analysis regarding flow-island interactions. Once the numerical validation process was completed for the cylinder using an experimental dataset, the validated model was implemented for islands (streamlined island, vertically sloped island (VSI), and realistically sloped island (RSI)). Analysis of the model results revealed the following key findings: 1) the RSI acted like a streamlined object and produced weaker lee-wake vortices with a longer recovery distance compared to the streamlined island and the VSI, 2) the RSI gained a better-streamlined form near the bed than near the water surface due to enhanced elongation, 3) this situation in the RSI case generated highly variable flow patterns along the depth behind the MCI, and 4) due to the three-dimensional geometry of the RSI, the generated large-scale vortices propagated asymmetrically towards the sides of the channel rather than remaining around the centerline.
{"title":"A numerical study of the flow patterns around midchannel islands in lowland rivers and their possible biogeomorphological impacts","authors":"Naghmeh HEİDARİ, Murat AKSEL, Oral YAĞCI, Manousos VALYRAKİS","doi":"10.30897/ijegeo.1320654","DOIUrl":"https://doi.org/10.30897/ijegeo.1320654","url":null,"abstract":"Midchannel islands (MCIs) are instream geomorphic units generally emerge in lowland rivers. Despite their significant ecomorphological services in the river ecosystem, the flow patterns around these self-forming riparian landforms and their impacts on aquatic life are not fully understood yet. Understanding the flow pattern around these formations enables practitioners to produce cost-effective, sustainable, and eco-friendly river management projects and strategies, forming the motivation of this study. Herein, the secondary flow pattern around MCIs was analyzed by employing a RANS-based numerical model. Flow around the simplified bodies was simulated to give a more precise analysis regarding flow-island interactions. Once the numerical validation process was completed for the cylinder using an experimental dataset, the validated model was implemented for islands (streamlined island, vertically sloped island (VSI), and realistically sloped island (RSI)). Analysis of the model results revealed the following key findings: 1) the RSI acted like a streamlined object and produced weaker lee-wake vortices with a longer recovery distance compared to the streamlined island and the VSI, 2) the RSI gained a better-streamlined form near the bed than near the water surface due to enhanced elongation, 3) this situation in the RSI case generated highly variable flow patterns along the depth behind the MCI, and 4) due to the three-dimensional geometry of the RSI, the generated large-scale vortices propagated asymmetrically towards the sides of the channel rather than remaining around the centerline.","PeriodicalId":492501,"journal":{"name":"International journal of environment and geoinformatics","volume":"160 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136278768","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}
Layered double hydroxides (LDH) have previously been extensively studied as high capacity adsorbents for the removal of dyes from water. However, a comprehensive understanding of why one dye is adsorbed more than another still remains unknown. In addition, a very little is known about how adsorption mechanisms scale when more than one dye is present in the solution. The adsorption capacity of cobalt-aluminum (CoAl) LDH was investigated for methyl orange (MO), remazol brilliant blue (RBBR) and allura red (AR), at different dye concentrations. The maximum mass of dye adsorbed was obtained for MO (2.267 mmol/g), followed by RBBR (0.258 mmol/g) and AR (0.195 mmol/g). X-Ray Diffraction and Fourier transform infrared analysis results demonstrated that surface adsorption and electrostatic interactions contributed to the adsorption while intercalation did not. In a binary solution of MO and RBBR, the highest mass of MO adsorbed was reduced to 1.521 mmol/g while the maximum RBBR mass adsorbed increased to 0.268 mmol/g. CoAl LDH had a preferential adsorption for RBBR within concentrations up to 0.026 mmol/L while MO was preferred at higher concentrations. Overall, the findings suggest that the adsorption capacity of an LDH is highly dependent on the number, characteristics and the equilibrium concentrations of dyes present in a solution.
{"title":"Competitive Adsorption of Anionic Dyes from Aqueous Single and Binary Solutions with CoAl Layered Double Hydroxide","authors":"İme AKANYETİ, Jamilu ABDULLAHİ","doi":"10.30897/ijegeo.1167267","DOIUrl":"https://doi.org/10.30897/ijegeo.1167267","url":null,"abstract":"Layered double hydroxides (LDH) have previously been extensively studied as high capacity adsorbents for the removal of dyes from water. However, a comprehensive understanding of why one dye is adsorbed more than another still remains unknown. In addition, a very little is known about how adsorption mechanisms scale when more than one dye is present in the solution. The adsorption capacity of cobalt-aluminum (CoAl) LDH was investigated for methyl orange (MO), remazol brilliant blue (RBBR) and allura red (AR), at different dye concentrations. The maximum mass of dye adsorbed was obtained for MO (2.267 mmol/g), followed by RBBR (0.258 mmol/g) and AR (0.195 mmol/g). X-Ray Diffraction and Fourier transform infrared analysis results demonstrated that surface adsorption and electrostatic interactions contributed to the adsorption while intercalation did not. In a binary solution of MO and RBBR, the highest mass of MO adsorbed was reduced to 1.521 mmol/g while the maximum RBBR mass adsorbed increased to 0.268 mmol/g. CoAl LDH had a preferential adsorption for RBBR within concentrations up to 0.026 mmol/L while MO was preferred at higher concentrations. Overall, the findings suggest that the adsorption capacity of an LDH is highly dependent on the number, characteristics and the equilibrium concentrations of dyes present in a solution.","PeriodicalId":492501,"journal":{"name":"International journal of environment and geoinformatics","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136278767","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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