Journal articles on the topic 'Geoenvironmental risk'
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Kamon, Masashi. "Remediation of Contaminated Land." Journal of Disaster Research 2, no. 3 (June 1, 2007): 173–89. http://dx.doi.org/10.20965/jdr.2007.p0173.
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Growing awareness of geoenvironmental hazards has made clear the need to develop better technical knowledge of environmental issues. We are thus studying how to remediate soil and groundwater contaminated by heavy metals and organic chemical substances in natural and man-made disasters. Remediation technology includes containment and risk assessment of contaminated land, with permeable reactive barriers (PRBs) and monitored natural attenuation (MNA) presented as the passive and cost-effective techniques. A case study to assess the effectiveness of a containment facility as a remedial technique in reducing human health risks was introduced. Numerical analyzed results confirm that this significantly reduces potential human health risks from land contaminated by polychlorinated biphenyls (PCB) and dioxin. Risk assessment based on in situ monitored data indicated that no significant health risks were induced. The important projected role of the geoenvironment is developing a sustainable contamination-free society.
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Sivakumar Babu, G. L. "Special issue on risk assessment in geotechnical and geoenvironmental practice." Georisk: Assessment and Management of Risk for Engineered Systems and Geohazards 4, no. 3 (September 2010): 109. http://dx.doi.org/10.1080/17499518.2010.516485.
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Mineev, Serhii P., Serhii А. Kurnosov, Serhii Yu Makeiev, and Leonid А. Novikov. "Geoenvironmental aspects of mine methane emissions." Journal of Geology, Geography and Geoecology 31, no. 3 (September 25, 2022): 521–28. http://dx.doi.org/10.15421/112248.
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The purpose of the work is to reveal the regularities of the influence of the gaseous phase on the process of filtering carbonated liquid and to characterize the physi-cochemical processes during the implementation of the method of reducing mine methane emissions. The development of minerals can be accompanied by the release of a large amount of methane into the mined-out space. This leads to atmospheric air pollution and consequently to ecological disturbances. This causes methane emissions to the mined-out space and to the surface of the earth cause by the filtration processes of gases and liquids in the rocks. The intensity of fluid filtration through crack and pore systems depends on the content and properties of the fluids and the reservoir properties of the rocks. It is known that methane release to the atmosphere can be observed after mines have been mothballed. This is a problem for many countries around the world where coal and oil and gas fields are being exploited. Investment in methane production and utilization projects is therefore important. Research on fluids filtration processes allow for the development of effective methane recovery methods, and ways to reduce methane emission speed. The result is the reduced air pollution and an improved environmental situation. The paper presents the filtration properties of rocks with different structures and textures. Filtration of carbonated liquid (water-methane) in fractures and pores is considered. It found that an increase in methane concentration in the carbonated liquid leads to a decrease in the phase permeability coefficient for water and an increase for methane. This character of change in phase permeability leads to methane accumulation in crack and pores. The dependence of the average carbonated liquid filtration rate in a rectilinear fracture on the methane concentration and the fracture axis angle of inclination is obtained. The average ascending filtration speed of the carbonated liquid is determined to be greater than the average descending filtration speed. This is due to the effect of the ejection force that acts on the gas bubbles in the liquid. The authors propose a method of blocking methane seepage by physicochemical treatment of the rock mass. The methane blocking effect is achieved by creating a gas-tight zone in areas with a high risk of methane migration to the ground surface. The result is a reduction in methane emissions to the mined-out space and the environment. When the method is realized, the solid product of the polymer solution enters cracks with a disclosure greater than 6 μm or pore channels with an average diameter of 6 μm. At the same time, the water released by the destabi- lization of the polymer solution blocks the methane in small cracks and pores. In pore channels with an average diameter of less than 25 μm, there is a sharp increase in the dynamic viscosity of the polymer solution. This effect is due to an increase in the intermolecular interaction forces between the polymer solution and the walls of the filtration channels. Coagulation and destabilization of the polymer solution in cracks and pores is due to the separation of large agglomerates of macromolecules.
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Alves Garcia, Marco Antonio, and Alves Garcia. "GEOENVIRONMENTAL CHARACTERIZATION OF AN ATLANTIC FOREST SLOPE IN SÃO SEBASTIÃO (SP)." EPH - International Journal of Science And Engineering 5, no. 2 (June 27, 2019): 8–16. http://dx.doi.org/10.53555/eijse.v5i2.85.
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The urban expansion and the growth of economic activities related to tourism, as well as those related to the port and sea, resulted in the occupation of the Serra do Mar slopes, in the municipality of São Sebastião - SP. This study was carried out in a clearing in an Atlantic Rainforest fragment of 4.8 hectares, located in the municipality of São Sebastião-SP, to provide subsidies to prevent and/or reduce the risks of land slippage on the slope. Thus, this work analyzed, characterized, and described the physiography and the properties of the soils on a slope of an Atlantic rainforest in the municipality of São Sebastião – SP, aiming to obtain a product on the risk of urban occupation. That is why, we used indicators associated with landscape physiography as a feature of slope (slope declivity), anthropic features (deforestation for crop cultivation and cattle raising) and soils (texture and pedogeochemistry). The results recommend structural actions, allowing the implementation of preventive measures such as revegetation of the area, thus minimizing the risks of land slippage and evolution of laminar erosion. Despite the dystrophic soil, the K, Ca and Mg levels only allow the vegetation implementation to be performed using NPK fertilization, reducing costs. Actions such as these are important as a way to prevent economic losses and accidents, since the area presents a Very High classification for mass movement processes.
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Gao, Lin, Xinjie Hu, Chuanming Ma, Heng Kuang, Huihui Qi, and Zekang He. "Geoenvironmental Risk Evaluation of High-Efficiency Eco-Economic Zone in Weifang City, China." Natural Hazards Review 21, no. 3 (August 2020): 05020005. http://dx.doi.org/10.1061/(asce)nh.1527-6996.0000384.
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Soares, Thais Dos Anjos, Sinara Gomes De Souza, and Simone Cardoso Ribeiro. "CARACTERIZAÇÃO GEOAMBIENTAL DO MUNICÍPIO DE MILAGRES/CE." Revista da Casa da Geografia de Sobral (RCGS) 21, no. 2 (September 30, 2019): 925–35. http://dx.doi.org/10.35701/rcgs.v21n2.555.
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Para compreensão da dinâmica do espaço natural, a Geografia Física possuiu inúmeras interdisciplinaridades que a acompanham, e a caracterização geoambiental é uma delas, no propósito de reconhecimento dos elementos constituintes da paisagem. O presente trabalho foca na caracterização geoambiental do município de Milagres, município do sul cearense, e teve como metodologia, pesquisa bibliográfica e cartográfica acerca dos elementos geoambientais da área de estudo, assim como a elaboração de material cartográfico utilizando os programas ArcGis e Qgis. Partindo desse material foi realizado uma breve descrição deste município, focando fundamentalmente nas características ambientais. É essencial o estudo da área em que irá realizar pesquisas, buscando o aprofundamento dos saberes de seus aspectos geoambientais para se obter uma prévia do conhecimento do local que irá ser trabalhado.Palavras-chave: Caracterização Geoambiental; Cariri cearense; Milagres/CE. ABSTRACTFor the dynamics of the natural space, a physical geography had numerous interdisciplinarities that accompany it, and a geoenvironmental characterization is one of them, without the purpose of recognition of the constituent elements of the landscape. The process of analysis of the processes of risk analysis and analysis of the morphosculpture processes and their use in the soil and in the health and sciences / EC systems, which studies the thematic knowledge of geomorphological processes considering the knowledge about nature and values of culture and local landscape, however, the geoenvironmental characterization work of the municipality of Milagres / CE. The work had as a methodological objective, bibliographical research and the translation of the geoenvironmental elements of the study area. For this work, cartographic material was elaborated using the programs ArcGis and Qgis. Starting from this material was a detailed description of its area of study, as well as one of its environmental characteristics. What is essential for the selection of geoenvironmental data to obtain a preview of the knowledge about the work place that will be realized.Keywords: Geoenvironmental Characterization; Cariri cearense; Milagres/CE. RESUMENPara comprender la dinámica del espacio natural, la Geografía Física tiene numerosas interdisciplinarías que la acompañan, y la caracterización geoambiental es una de ellas, para reconocer los elementos constitutivos del paisaje. El presente trabajo se centra en la caracterización geoambiental del municipio de Milagres, municipio de sul cearense, y tuvo como metodología, investigación bibliográfica y cartográfica sobre los elementos geoambientales del área de estudio, así como la elaboración de material cartográfico utilizando los programas ArcGis y Qgis. A partir de este material se realizó una breve descripción de este municipio, centrándose principalmente en las características ambientales. Es esencial estudiar el área en la que realizar investigaciones, buscando profundizar el conocimiento de sus aspectos geoambientales para obtener un conocimiento previo del lugar donde se trabajará.Palabras clave: caracterización geoambiental; Cariri Ceará; Milagros / CE.
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Trubitsina, O. P., and V. N. Bashkin. "Consideration of Geopolitical Challenges within the Analysis of Geoenvironmental Risks for Oil and Gas Development of the Russian Arctic." Issues of Risk Analysis 16, no. 6 (December 27, 2019): 50–59. http://dx.doi.org/10.32686/1812-5220-2019-16-6-50-59.
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The article is devoted to the consideration of geopolitical challenges for the analysis of geoenvironmental risks (GERs) in the hydrocarbon development of the Arctic territory. Geopolitical risks (GPRs), like GERs, can be transformed into opposite external environment factors of oil and gas industry facilities in the form of additional opportunities or threats, which the authors identify in detail for each type of risk. This is necessary for further development of methodological base of expert methods for GER management in the context of the implementational proposed two-stage model of the GER analysis taking to account GPR for the improvement of effectiveness making decisions to ensure optimal operation of the facility oil and gas industry and minimize the impact on the environment in the geopolitical conditions of the Arctic.The authors declare no conflict of interest
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Oliveira, Anna Luiza Garção, Onaldo José Nunes Filho, Olívio Fiorese Neto, Fabrício Borges Amaral, Regiane Lima Rodrigues, and Thiago Augusto Mendes. "Geoenvironmental Analysis for the Delimitation of the Construction waste Disposal Área." Baru 3, no. 2 (December 19, 2017): 270. http://dx.doi.org/10.18224/baru.v3i2.6169.
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Abstract: the intense production of construction and demolition waste (RCCD) in city spaces is a central problem for public management, especially in view of the difficulty in finding suitable places for the disposal of this waste without this poses a risk to the environment. In this sense, the present study aims to identify geoenvironmental aspects (geological, geomorphological and hydrological dynamics) for the evaluation of the terrain with the aid of GIS tools and field expeditions. In order to do so, the methodological stages were systematically systematized. They were: thematic maps, interviews with residents and technicians of the City Hall, monitoring of the deposit formation process and final environmental diagnosis. Finally, it was possible to list and propose structural and non-structural, corrective and mitigating measures for the area of deposit and permanent balance with the environment and with the predominant forms of use and occupation of the region.Análise Geoambiental para Delimitação de Área de Depósito de Resíduos de Construção CivilResumo: a intensa produção de resíduos de construção civil e demolição (RCCD) nos espaços das cidades constitui um problema central para a gestão pública, especialmente diante da dificuldade em se encontrar lugares adequados para deposição destes resíduos sem que isso configure um risco à população . Nesse sentido, o presente estudo visa elencar aspectos geoambientais (geológicos, geomorfológicos e dinâmica hidrológica) para avaliação do terreno com o auxílio de ferramentas SIG e expedições de campo. Para tanto, sistematizou-se, sequencialmente, as etapas metodológicas, sendo elas: elaboração de mapas temáticos, entrevistas com moradores e técnicos da Prefeitura Municipal, acompanhamento do processo de formação do depósito e diagnóstico ambiental final. Por fim, foi possível elencar e propor medidas estruturais e não-estruturais, corretivas e mitigadoras para a área do depósito possibilitando equilíbrio ambiental em consonância com as formas de uso e ocupação predominantes da região.
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Spanidis, Philip-Mark, Christos Roumpos, and Francis Pavloudakis. "A Methodology Combining IDEF0 and Weighted Risk Factor Analysis for the Strategic Planning of Mine Reclamation." Minerals 12, no. 6 (June 3, 2022): 713. http://dx.doi.org/10.3390/min12060713.
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The reclamation of lignite surface mines is a long-term commitment of high complexity. These reclamation projects consist of land use repurposing, reinstatement of landforms and landscape, remediation of polluted soils and water bodies, restoration of ecosystems, and other related activities, which are usually developed when mines enter the ultimate phase of their operational life. Nowadays, reclamation is supported by regulatory settings and legislative provisions, which motivate the affected communities to move towards a circular economy and sustainable development. This paper investigates the geoenvironmental and socioeconomic problems of reclamation and draws research questions on how the strategic planning of a reclamation project can be performed and how the relevant project risks can be investigated and managed. In turn, a prototype methodology based on experts’ judgment is suggested with a case study combining: (a) the IDEF0 (Integrated DEFinition Function) modelling technique, as a low cost and easy-to-develop tool enabling strategic planning of reclamation projects, and (b) the Weighted Risk Factor analysis as a suitable method for effective risk analysis and response planning in post-mining frameworks. Finally, a discussion on the methodology and proposals for further research are provided.
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Trubitsina, O. P., and V. N. Bashkin. "Ecological rating as an indicator of geoenvironmental risk management of Russian oil and gas companies in the Arctic." Issues of Risk Analysis 16, no. 2 (April 28, 2019): 58–69. http://dx.doi.org/10.32686/1812-5220-2019-16-2-58-69.
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The article is devoted to the issues of environmental ratings as an indicators of the process of geoenvironmental risk (GER) management of Russian oil and gas companies, operating in theArctic. The authors demonstrate the algorithm of GER management model processes and reveal the need to use environmental ratings for the oil and gas industry. Particular attention is given to the issues of rating results of Environmental Responsibility of Oil and Gas companies in Russia that was held in 2014—2017 years. It was conducted by the cooperative initiative by CREON Group and WWF Russia with participation of National Rating Agency. The authors have selected from all Russian oil and gas companies only those who operating in the Arctic region and they have analyzed them. The rating's results show that the leaders are companies whose management pays special attention to gas. They are Sakhalin Energy (Sakhalin-2), Gazprom and Zarubezhneft. The authors point out that the environmental rating of Russian oil and gas companies can serve as an indicator of GER management, as a tool to inform foreign investors about the environmental impact to ensure the ecological safety of the region.
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Fernandes da Silva, P. C., and J. C. Cripps. "Comparing directional line sets using non-parametric statistics: a new approach for geoenvironmental applications." Stochastic Environmental Research and Risk Assessment 22, no. 2 (March 30, 2007): 231–46. http://dx.doi.org/10.1007/s00477-007-0110-9.
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Darwish, Mahmoud H., and Wael F. Galal. "Spatiotemporal effects of wastewater ponds from a geoenvironmental perspective in the Kharga region, Egypt." Progress in Physical Geography: Earth and Environment 44, no. 3 (October 13, 2019): 376–97. http://dx.doi.org/10.1177/0309133319879321.
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One of the major geoenvironmental problems in the Kharga region arises from the haphazard exploitation of groundwater resources and sewage dumping, which have resulted in wastewater accumulation in the form of ponds. The impact of the spatial expansion of wastewater ponds in Kharga and the surrounding area has been so pervasive that ponds have become a source of environmental degradation. These ponds are distributed throughout the area, but the major lakes are located in the eastern and southeastern provinces. The water levels of these ponds are rising at a remarkable rate, especially in the winter, when there is no evaporation and rainfall can lead to overflows that flow towards cities, villages and farmlands. As a result of untreated sewage inflows, all the low surrounding spaces are at high risk of being influenced by these ponds. The objectives of this study were to evaluate the spatiotemporal threats posed by wastewater ponds and develop a conceptual model to estimate the geoenvironmental impacts on the surrounding areas. GIS and remote sensing were used to process all available geological, topographical, hydrogeological, hydrological, land use and environmental data. The pond expansion trend was estimated from Landsat time series from 1984 to 2018, and the results indicated that the wastewater bodies continuously increased and the land cover percentage decreased. The encroachment of wastewater ponds has resulted in extensive land cover disturbances in recent years, and land use change has affected nearly 2.5% of the region. The complexity of the problems associated with wastewater ponds in the Kharga district requires a comprehensive management plan that is effective in not only maintaining the stability of the ponds but also in improving the sociocultural and economic conditions around the ponds. Specifically, the wastewater drainage and accumulation system should be managed according to the surrounding functional context.
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Balint, Alexandru. "Physical, chemical and toxicological properties of polycyclic aromatic hydrocarbons (PAHs) in human exposure assessments to contaminated soil and groundwater." MATEC Web of Conferences 342 (2021): 03016. http://dx.doi.org/10.1051/matecconf/202134203016.
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Polycyclic aromatic hydrocarbons (PAHs) are a class of chemical substances consisting of carbon and hydrogen only, which have multiple fused ring systems. Although PAHs are widely recognised as contaminants of concern (CoC), no applicable limits have been established for groundwater in the Romanian legislation. Furthermore, the existing methodologies do not include guidelines for assessing the human exposure to contaminated soil and groundwater. The current research aims at identifying the relevant physical, chemical and toxicological properties of PAHs when conducting human exposure assessments for contaminated and potentially contaminated sites. The methods applied in the research are based on the general geoenvironmental risk assessment procedure by analysing the sources potentially generating PAHs, the migration and exposure pathway depending on their fate and transport properties, and the vulnerability to PAHs of the potential receptors, based on their toxicological profile.
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Forte, F., L. Pennetta, and R. O. Strobl. "Historic records and GIS applications for flood risk analysis in the Salento peninsula (southern Italy)." Natural Hazards and Earth System Sciences 5, no. 6 (November 2, 2005): 833–44. http://dx.doi.org/10.5194/nhess-5-833-2005.
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Abstract. The occurrence of calamitous meteoric events represents a current problem of the Salento peninsula (Southern Italy). In fact, flash floods, generated by very intense rainfall, occur not only in autumn and winter, but at the end of summer as well. These calamities are amplified by peculiar geological and geomorphological characteristics of Salento and by the pollution of sinkholes. Floodings affect often large areas, especially in the impermeable lowering zones. These events cause warnings and emergency states, involving people as well as socio-economic goods. A methodical investigation based on the historic flood records and an analysis of the geoenvironmental factors have been performed, using a Geographic Information System (GIS) methodology for database processing in order to identify the distribution of areas with different risk degrees. The data, referring to events that occurred from 1968 to 2004, have been collected in a database, the so-called IPHAS (Salento Alluvial PHenomena Inventory), extracted in an easily consultable table. The final goal is the development of a risk map where the areas that are affected by floodings are included between small ridges, the so-called "Serre". More than 50% of the Salento peninsula shows high or very high risk values. The numerous maps that were utilized and generated represent an important basis in order to quantify the flood risk, according to the model using historic records.
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Gałaś, Slávka. "Delimitation of Areas of Environmental Conflicts on the Background of Geological Conditions, Exemplified by Stary Sącz Commune." Civil And Environmental Engineering Reports 13, no. 2 (December 10, 2014): 19–29. http://dx.doi.org/10.2478/ceer-2014-0012.
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Abstract Delimitation and characterization of areas of conflict are essential to assess suitability of land for different activities carried out in the field of rational land use. In the paper, delimitation of the conflict areas and conflicts categorization in terms of possibility of their overcoming, the scale of the range and the period of their occurrence exemplified by urban - rural commune Stary Sącz have been presented. The software ArcGIS 10.1, the method of maps superimposing and analysis of interactions between different geoenvironmental factors have been applied to obtain the goal of the investigation. Specific geological structure together with morphological and climatic conditions in Stary Sącz commune create ideal conditions for occurrence of con-flict areas on the background of the geological conditions. Accurate and early recognition of these conflicts - existing and potential ones, is a prerequisite for the environmental risk prevention and elimination of its effects through the proper preparation of planning documents and development plans and programs.
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Miranda, Antônio Carlos da Silva, and Aline Maria Meiguins de Lima. "Voçorocas urbanas e protocolo de avaliação de risco geoambiental aplicado em Açailândia-MA." Revista Brasileira de Geografia Física 15, no. 2 (April 21, 2022): 721. http://dx.doi.org/10.26848/rbgf.v15.2.p721-735.
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As formas de uso e ocupação do solo sem planejamento tendem a gerar diversos problemas no processo de expansão das cidades, dentre estes, citam-se os riscos geológicos. Este estudo teve como objetivo a análise do impacto das erosões urbanas, com a apresentação de uma proposta de avaliação, tendo como exemplo de aplicação as voçorocas de Açailândia (MA). A metodologia utilizou análises qualitativas e quantitativas, visando compreender a origem do processo erosivo urbano (natural e/ou antrópico) e os efeitos decorrentes dos fenômenos naturais, fatores controladores e das ações antrópicas. Como aplicação do método foram escolhidas duas voçorocas localizadas em áreas com características distintas, sendo uma em zona de transição rural para urbana (periurbana) e a outra em uma área urbaniza. De acordo com os resultados encontrados as voçorocas analisadas são classificadas como muito grande, com volumes erodidos acima de 40.000 m³, tendo elevada influência do crescimento da cidade, implicando na necessidade de procedimentos e ações voltadas a gestão de riscos a desastres erosivos. As formas de uso e ocupação da terra sem planejamento tendem a gerar diversos problemas no processo de expansão das cidades, dentre estes, citam-se os riscos geológicos. Este estudo propõe uma sistemática base de caracterização de voçorocas em ambientes urbanizados, voltada para a análise de risco geoambiental, tendo como exemplo de aplicação as voçorocas de Açailândia (MA). A metodologia utilizou análises qualitativas e quantitativas, visando compreender a origem do processo erosivo urbano (natural e/ou antrópico) e os efeitos decorrentes dos fenômenos naturais, fatores controladores e das ações antrópicas. Como aplicação do método foram escolhidas duas voçorocas localizadas em áreas com características distintas, sendo uma em zona de transição rural para urbana (periurbana) e a outra em uma área urbaniza. De acordo com os resultados encontrados as voçorocas analisadas são classificadas como muito grande, com volumes erodidos acima de 40.000 m³, tendo elevada influência do crescimento da cidade, implicando na necessidade de procedimentos e ações voltadas a gestão de riscos e de redução dos impactos referentes aos processos erosivos.Palavras-chave: Risco geológico, processos erosivos, uso do solo. Urban gullies and geoenvironmental risk assessment protocol applied in Açailândia-MA ABSTRACTThe land use and occupation without planning tend to generate several problems in the process of expansion of the cities, for example, the geological risk. This study proposes a systematic basis for characterizing gullies in urbanized environments, applied for the analysis of geoenvironmental risk, using gullies in Açailândia (MA) as an application example. The methodology used qualitative and quantitative analyzes to understand the origin of the urban erosion process (natural and/or anthropic) and the effects resulting from natural phenomena and controlling by anthropic actions. As application of the method, two gullies located in areas with different characteristics were chosen, one in a rural to urban transition zone (peri-urban) and the other in an urbanized area. According to the results found the gullies analyzed are classified as very large, with the eroded volumes above 40000 m³, with high influence of city growth, which means the need to implement procedures and actions applied to risk management and reduction of impacts regarding the erosion.Keywords: Geological risk, erosion, land use.
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Miranda, Antônio Carlos da Silva, and Aline Maria Meiguins de Lima. "Voçorocas urbanas e protocolo de avaliação de risco geoambiental aplicado em Açailândia-MA." Revista Brasileira de Geografia Física 14, no. 2 (April 14, 2021): 492. http://dx.doi.org/10.26848/rbgf.v14.2.p492-506.
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As formas de uso e ocupação do solo sem planejamento tendem a gerar diversos problemas no processo de expansão das cidades, dentre estes, citam-se os riscos geológicos. Este estudo teve como objetivo a análise do impacto das erosões urbanas, com a apresentação de uma proposta de avaliação, tendo como exemplo de aplicação as voçorocas de Açailândia (MA). A metodologia utilizou análises qualitativas e quantitativas, visando compreender a origem do processo erosivo urbano (natural e/ou antrópico) e os efeitos decorrentes dos fenômenos naturais, fatores controladores e das ações antrópicas. Como aplicação do método foram escolhidas duas voçorocas localizadas em áreas com características distintas, sendo uma em zona de transição rural para urbana (periurbana) e a outra em uma área urbaniza. De acordo com os resultados encontrados as voçorocas analisadas são classificadas como muito grande, com volumes erodidos acima de 40.000 m³, tendo elevada influência do crescimento da cidade, implicando na necessidade de procedimentos e ações voltadas a gestão de riscos a desastres erosivos. As formas de uso e ocupação da terra sem planejamento tendem a gerar diversos problemas no processo de expansão das cidades, dentre estes, citam-se os riscos geológicos. Este estudo propõe uma sistemática base de caracterização de voçorocas em ambientes urbanizados, voltada para a análise de risco geoambiental, tendo como exemplo de aplicação as voçorocas de Açailândia (MA). A metodologia utilizou análises qualitativas e quantitativas, visando compreender a origem do processo erosivo urbano (natural e/ou antrópico) e os efeitos decorrentes dos fenômenos naturais, fatores controladores e das ações antrópicas. Como aplicação do método foram escolhidas duas voçorocas localizadas em áreas com características distintas, sendo uma em zona de transição rural para urbana (periurbana) e a outra em uma área urbaniza. De acordo com os resultados encontrados as voçorocas analisadas são classificadas como muito grande, com volumes erodidos acima de 40.000 m³, tendo elevada influência do crescimento da cidade, implicando na necessidade de procedimentos e ações voltadas a gestão de riscos e de redução dos impactos referentes aos processos erosivos.Palavras-chave: Risco geológico, processos erosivos, uso do solo. Urban gullies and geoenvironmental risk assessment protocol applied in Açailândia-MA ABSTRACTThe land use and occupation without planning tend to generate several problems in the process of expansion of the cities, for example, the geological risk. This study proposes a systematic basis for characterizing gullies in urbanized environments, applied for the analysis of geoenvironmental risk, using gullies in Açailândia (MA) as an application example. The methodology used qualitative and quantitative analyzes to understand the origin of the urban erosion process (natural and/or anthropic) and the effects resulting from natural phenomena and controlling by anthropic actions. As application of the method, two gullies located in areas with different characteristics were chosen, one in a rural to urban transition zone (peri-urban) and the other in an urbanized area. According to the results found the gullies analyzed are classified as very large, with the eroded volumes above 40000 m³, with high influence of city growth, which means the need to implement procedures and actions applied to risk management and reduction of impacts regarding the erosion.Keywords: Geological risk, erosion, land use.
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E SOUZA, CELIA REGINA DE GOUVEIA. "Coastal Erosion Risk Assessment, Shoreline Retreat Rates and Causes of Coastal Erosion Along the State of São Paulo Coast, Brazil." Pesquisas em Geociências 28, no. 2 (December 31, 2001): 459. http://dx.doi.org/10.22456/1807-9806.20320.
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Monitoring on coastal erosion problems along the São Paulo shoreline have been carrying out by the author since mid the 80’s, including almost 87% of the whole 430 km length of sandy beaches. Eleven types of indicators of coastal erosional processes have been recognized, which have been attributed to seventeen causes, among them ten correspond to natural mechanisms and seven are due to anthropogenic interference. In this paper is presented rates of shoreline retreat based on the Bruun Rule application for six of the most threatened beaches, for a period as long as 56 years. Risk assessment is also estimated for these six beaches based on two criteria: (i) the total number (sum) of types of coastal erosion indicators found along the shoreline (frequency among the 11 types) and (ii) general spatial distribution (percentage of surface area) of coastal erosion indicators along the shoreline. Causes and effects of the coastal erosional processes are discussed for these six beaches. Results reveal high rates of shoreline retreat, even in non-urbanized areas, as well demonstrate that the six beaches are at very-high risk. Moreover, they indicate that natural mechanisms are very important as cause of coastal erosional processes in São Paulo, sometimes most them the human-induced causes. These studies have widely been supporting the State Plan for Coastal Zone Management, in order to create special rules for occupation and some activities along the shoreline, including engineering works, building and sand beach exploration. Besides, results are being recorded in a geoenvironmental information system for the Coastal Zone of the State of São Paulo (Project SIIGAL), which is in phases of implantation.
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Parbhakar-Fox, Anita, Nathan Fox, Laura Jackson, and Rebekah Cornelius. "Forecasting Geoenvironmental Risks: Integrated Applications of Mineralogical and Chemical Data." Minerals 8, no. 12 (November 22, 2018): 541. http://dx.doi.org/10.3390/min8120541.
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Management of solid mine wastes requires detailed material characterisation at the start of a project to minimize opportunities for the generation of acid and metalliferous drainage (AMD). Mine planning must focus on obtaining a thorough understanding of the environmental properties of the future waste rock materials. Using drill core obtained from a porphyry Cu project in Northern Europe, this study demonstrates the integrated application of mineralogical and geochemical data to enable the construction of enviro-geometallurgical models. Geoenvironmental core logging, static chemical testing, bulk- and hyperspectral mineralogical techniques, and calculated mineralogy from assay techniques were used to critically evaluate the potential for AMD formation. These techniques provide value-adding opportunities to existing datasets and provide robust cross-validation methods for each technique. A new geoenvironmental logging code and a new geoenvironmental index using hyperspectral mineralogical data (Hy-GI) were developed and embedded into the geochemistry-mineralogy-texture-geometallurgy (GMTG) approach for waste characterisation. This approach is recommended for new mining projects (i.e., early life-of-mine stages) to ensure accurate geoenvironmental forecasting, therefore facilitating the development of an effective waste management plan that minimizes geoenvironmental risks posed by the mined materials.
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Ngo, Trinh Quoc, Nguyen Duc Dam, Nadhir Al-Ansari, Mahdis Amiri, Tran Van Phong, Indra Prakash, Hiep Van Le, Hanh Bich Thi Nguyen, and Binh Thai Pham. "Landslide Susceptibility Mapping Using Single Machine Learning Models: A Case Study from Pithoragarh District, India." Advances in Civil Engineering 2021 (July 22, 2021): 1–19. http://dx.doi.org/10.1155/2021/9934732.
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Landslides are one of the most devastating natural hazards causing huge loss of life and damage to properties and infrastructures and adversely affecting the socioeconomy of the country. Landslides occur in hilly and mountainous areas all over the world. Single, ensemble, and hybrid machine learning (ML) models have been used in landslide studies for better landslide susceptibility mapping and risk management. In the present study, we have used three single ML models, namely, linear discriminant analysis (LDA), logistic regression (LR), and radial basis function network (RBFN), for landslide susceptibility mapping at Pithoragarh district, as these models are easy to apply and so far they have not been used for landslide study in this area. The main objective of this study is to evaluate the performance of these single models for correctly identifying landslide susceptible zones for their further application in other areas. For this, ten important landslide affecting factors, namely, slope, aspect, curvature, elevation, land cover, lithology, geomorphology, distance to rivers, distance to roads, and overburden depth based on the local geoenvironmental conditions, were considered for the modeling. Landslide inventory of past 398 landslide events was used in the development of models. The data of past landslide events (locations) was randomly divided into a 70/30 ratio for training (70%) and validation (30%) of the models. Standard statistical measures, namely, accuracy (ACC), specificity (SPF), sensitivity (SST), positive predictive value (PPV), negative predictive value (NPV), Kappa, root mean square error (RMSE), and area under the receiver operating characteristic curve (AUC), were used to evaluate the performance of the models. Results indicated that the performance of all the models is very good (AUC > 0.90) and that of the LR model is the best (AUC = 0.926). Therefore, these single ML models can be used for the development of accurate landslide susceptibility maps. Our study demonstrated that the single models which are easy to use and can compete with the complex ensemble/hybrid models can be applied for landslide susceptibility mapping in landslide-prone areas.
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Rotaru, Ancuta, and Chavdar Kolev. "ADDRESSING ISSUES OF GEOENVIRONMENTAL RISKS IN DOBRUJA, ROMANIA/BULGARIA." Environmental Engineering and Management Journal 9, no. 7 (2010): 961–69. http://dx.doi.org/10.30638/eemj.2010.129.
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ΜΑΡΙΟΛΑΚΟΣ, ΗΛΙΑΣ Δ. "The Geoenvironmental dimension of Greek Mythology." Bulletin of the Geological Society of Greece 34, no. 6 (January 1, 2002): 2065. http://dx.doi.org/10.12681/bgsg.17334.
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Native civilizations, as that of the ancient Greeks, are directly connected to the geological and the physicogeographical regime of the regional area in which they have been developed, and mainly to its geoenvironmental evolution since the last glacial period (18,000 BP). Volcanoes, earthquakes and mineral resources, as building materials, the underground water and the various minerals, consist the so called geological regime. Soil, climate, relief, shorelines and coastal areas belong to the physicogeographical regime of an area. The regional territory, where the prehistorical and historical ancient Hellenic civilization has been developed is the Hellenic Peninsula, Aegean Sea and the coasts of Minor Asia, from the geotectonic point of view, composing the Hellenic Arc which is characterized by intense tectonic, seismic and volcanic activity. The main factor contributing to the evolution of the Hellenic civilization is the climate and its fluctuations, mainly during the last 18,000 years, and most essentially the impact of these changes in the displacement of the shorelines and the coastal areas in general. It is widely known that climate changes periodically and that the main reasons for this periodicity are astronomical (Milankowitch theory). Thus, during Quaternary, several successive glacial and interglacial periods have been observed due to the increasing and decreasing of the solar radiation that earth receives. The last glacial period ends approximately 18,000 years BP, since, for the same astronomical reasons, earth's mean temperature abruptly increased. Due to this increase, huge volume of glaciers started to melt resulting to the release of large water quantities, which until that time were trapped within the glaciers, resulting in the gradual rise of the global sea level that, around 18,000 years BP, was about 125 m. lower than today. This rise caused successively transgression of all areas that nowadays constitutes the seafloor of Aegean Sea until a depth around 125 m. This transgression happened within a few thousands of years, namely between 18,000 and 6,000 years BP approximately. Therefore, prehistoric man who inhabited the area of the Aegean Sea, though until 18,000 years BP was living for tens of thousands of years in a geoenvironment unfavourable but more or less stable, following 18,000 BP and due to the increase of the mean temperature of the earth's atmosphere, he witnessed cosmogony changes. These especially concern the change of the coastal scene, since year after year, slowly but steadily, coastal areas are being submerged, featuring high mean velocities that under certain conditions should exceed 5 m per year. Together with these shoreline displacements if one takes also into account seismicity, volcanic activity and the related phenomena (tsunamis, abrupt uplift or subsidence of the coastal areas caused by earthquakes, landslides, rockfalls, etc.), the physicogeological scenery should have been a nightmare. The third generation of the Gods must have been originated during this period. This generation is the result of the union of Gaia (Earth), the Big Mother of all, and Ouranos (Heaven), namely Titans, Ekatoncheires, Cyclops and Giants, who might represent the destructive natural powers that terrify man and move the earth under his feet. What else than volcanoes might Giants represent, when, according to the Hellenic Mythology ".... they (the giants) breathed fire from their mouth ...." "...they were crying out wildly....", "they were shooting rocks and blazing trees in the sky "! ? Yet, Paleolithic and Mesolithic man needs to create more gods who will protect him from all these natural disasters. So, he originates the fourth generation that comes out of the union of the Titan Kronos and the Titanide Rhea. In this generation belong some of the great gods, such as Hera, Demeter, Estia, Hades, Poseidon and Zeus. The favorable climate ensures the basic nutrition species that man needs, either he is a food collector or he is a food producer, and especially without any particular effort. This means that it allows prehistoric man to have enough free time. Especially after his inhabitance in towns, he may be continuously mobile in the open space and he may communicate with other men having free time as well. In order to attitude within his small society, he has to learn to discuss, to argue, to oppose, to agree or to disagree with his co-speakers. Yet, all these constitute the basic substantial features of Democracy. All these physicogeographical and geological changes of the mythological and the prehistorical, in general, era, that have determined directly or indirectly all partial settings and the evolution of the civilization itself, should be promoted in such a way that the relationship between physicogeographical environment and civilization should be primarily introduced.
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Taha, Mohd Raihan. "Recent Developments in Nanomaterials for Geotechnical and Geoenvironmental Engineering." MATEC Web of Conferences 149 (2018): 02004. http://dx.doi.org/10.1051/matecconf/201814902004.
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Nanotechnology has provided enormous benefits to the industrial and developed world. Most fields of knowledge have been tapping, using, and applying the advantages of nanotechnology to improve systems and living standards. This cannot be said for civil engineering and construction particularly geotechnical engineering. Actually, soil mechanics have been involved with nano scale dimensions and materials for a very long time, i.e. before the term nanotechnology and nanomaterials were coined. From the basic clay structure and the water molecules which give rise to soil plasticity/cohesiveness, geotechnical engineers were exposed to these phenomena since the early days of the subject. Currently, developments in nanotechnology and nanomaterials in geotechnical engineering has been limited to its use as an improvement and clean-up materials. Recent results have shown that the use of a small amount of nanomaterials (<1% of dry weight of the original soil) have resulted in significant change and improvement in soil properties. This is important since efficient use of materials is one of the facets of sustainability related to prolonging the life of our depleting natural resources. Experiences with nano-soil, nano-clay, nano-silica, nano-alumina, nano-magnesium, carbon nanotube and nanofibers, and nano-lime will all be discussed with respect to its use in soil improvement and soil remediation.
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Aleshin, Yurii, Ilgiz Aitmatov, Isakbek Torgoev, and Bektur Chukin. "Ecology and mining industry development in high-mountain areas (the Inner Tien Shan)." E3S Web of Conferences 56 (2018): 04022. http://dx.doi.org/10.1051/e3sconf/20185604022.
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The genesis and transformation in time of risks in the areas of high altitude tailings storage facilities with respect to changing climate are considered. Based on the example of the Kumtor mine in the center of the Tien Shan at a height of 3600-4300 m, three groups of risk factors were allocated concerning a large, ecologically hazardous facility - the tailings dam containing cyanide waste. For one of the factors, calculations of an accidental dam burst were made using the Fault Tree Analysis (FTA) method. It was concluded that the construction of large-scaled and geoenvironmentally hazardous facilities in less researched high-mountain areas has to be be drawn upon detailed and permanent monitoring of the facility itself and its environment. It is crucial to be prepared for operational adjustment of projects and an immediate rehabilitation of constructed facilities.
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Adewoye, A. O., D. Oloyede, and S. O. Adewoye. "Geoenvironmental and health risks associated with toxic metals in goldmine site of Iperindo, southwestern Nigeria." IOP Conference Series: Earth and Environmental Science 655, no. 1 (February 1, 2021): 012071. http://dx.doi.org/10.1088/1755-1315/655/1/012071.
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Capoane, Viviane, Daiane Alencar Da Silva, Thaís De Oliveira Guimarães, and Melina Fushimi. "Caracterização geoambiental da bacia hidrográfica do Córrego Pombal e avaliação do potencial geoturístico da comunidade quilombola Furnas do Dionísio, Jaraguari – MS." Revista Brasileira de Geografia Física 15, no. 1 (March 23, 2022): 068. http://dx.doi.org/10.26848/rbgf.v15.1.p068-091.
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A caracterização de bacias hidrográficas é fundamental para quantificar os riscos, e diagnosticar a saúde, a vulnerabilidade, o potencial de recuperação e os locais prioritários para conservação e restauração em nível nacional e regional. No presente trabalho i) foi feita a caracterização geoambiental da bacia hidrográfica do córrego Pombal a fim de gerar dados que subsidiem planejadores e gestores na tomada de decisão, e ii) foi avaliado o potencial geoturístico da comunidade quilombola Furnas do Dionísio a fim orientar seu desenvolvimento. Para a caracterização geoambiental foram utilizados dados geográficos de diferentes fontes (CPRM e IBGE), escalas (1:1.000.000, 1:250.000), resolução espacial (USGS), e resolução temporal (MapBiomas). Os programas de geoprocessamento utilizados foram: ArcGIS (extração dos atributos topográficos primários), SAGA GIS (extração dos atributos topográficos secundários), e SNAP (índice radiométrico de vegetação). O potencial geoturístico foi analisado com base na caracterização geoambiental da bacia hidrográfica e em trabalhos de campos. A bacia hidrográfica do córrego Pombal corresponde a um ambiente ecologicamente frágil e os usos antrópicos atuais não consideram as aptidões e restrições agrícolas, o que têm impactado os ambientes terrestres e aquáticos. O geoturismo constitui em uma alternativa para o desenvolvimento ecológico, econômico e social da comunidade.Palavras-chave: Sistema de Informação Geográfica, Geoespacial, MDS, Geodiversidade, Geoconservação.Geoenvironmental characterization of the Pombal watershed and evaluation of the geotourism potential of the quilombola community Furnas do Dionísio, Jaraguari – MSA B S T R A C TThe characterization of watersheds is essential for the quantification of risks, the diagnosis of health, vulnerability and recovery potential, and the identification of priority sites for conservation and restoration at the regional and national level. In the present work, i) a geoenvironmental characterization of the Pombal watershed was produced to generate data to aid planners and managers in decision-making, and ii) an evaluation of the geotourism potential of the “Furnas do Dionísio” quilombola community was made to guide its development. Geographic data from different sources (CPRM and IBGE), scales (1:1,000,000, 1:250,000), spatial resolution (USGS), and temporal resolution (MapBiomas) were used for the geoenvironmental characterization. The programs ArcGIS (extraction of primary topographic attributes), SAGA GIS (extraction of secondary attributes), and SNAP (radiometric index of vegetation) were used for geoprocessing. The geotourism potential was analyzed based on the geoenvironmental characterization of the watershed and in fieldwork. The terrestrial and aquatic environments of the Pombal watershed, an ecologically fragile environment, was impacted by anthropic usage, which did not consider agricultural capacity nor restrictions. Geotourism is an alternative for the ecological, economic, and social development of the community.Keywords: Geographic Information System, Geospatial, DSM, Geodiversity, Geoconservation.
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Edahbi, M., B. Plante, M. Benzaazoua, and A. Cayer. "Geoenvironmental characterization of two REE deposits: the Montviel carbonatites and Kipawa silicates, Quebec Canada." IOP Conference Series: Earth and Environmental Science 1090, no. 1 (October 1, 2022): 012013. http://dx.doi.org/10.1088/1755-1315/1090/1/012013.
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Abstract Drainage water quality is the significant environmental concern for the rare earth elements (REE) mining industry. REE deposits are associated with other metals and radioactive bearing minerals. REE mining and refining activities can generate significant quantities of liquid and solid wastes. Therefore, a long-term integrated approach covering the full mine-life cycle is required to mitigate possible environmental concerns. In the present study, two REE concentrates were prepared and all deposit lithologies of carbonatites and silicates sampled and investigated for their mineralogy, geochemistry, and their environmental behavior using kinetic testing. For the Montviel carbonatite (enriched in light rare earth elements, or LREE), the majority of REE-bearing minerals are associated with carbonates (i.e., monazite, kukharenkoite, burbankite, etc.), whereas the REE-bearing minerals associated with the Kipawa silicates (enriched in heavy rare earth elements, or HREE) are fluorbritholite, eudyalite, mosandrite, etc. The kinetic tests showed a neutral to alkaline pH of leachates and a low leachability of REE (carbonatites <140 μg/L; silicates <15 μg/L) with a higher mobility of HREE than LREE. The reactivity of REE carbonates are one to two orders of magnitude higher than REE silicates. For sustainable mineral development, geological and environmental data was integrated into the geometallurgical model to identify and control the environmental risks associated with mining those two deposits.
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Bussière, Bruno. "Colloquium 2004: Hydrogeotechnical properties of hard rock tailings from metal mines and emerging geoenvironmental disposal approaches." Canadian Geotechnical Journal 44, no. 9 (September 2007): 1019–52. http://dx.doi.org/10.1139/t07-040.
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Tailings are ground rock particles from which the valuable minerals or metals have been extracted. An historical overview on hard rock mines shows that since the 1930s, it has become current practice to pump the tailings into storage areas circumscribed by dykes made of the tailings themselves. However, numerous physical and chemical stability problems were observed mainly owing to the particular hydrogeotechnical and mineralogical properties of the tailings. Therefore, modifications to the conventional methods were proposed, but these were relatively costly, not always efficient, and sometimes difficult to implement. New management methods that improve the physical and (or) chemical stability have hence been developed to reduce environmental risks associated with tailings storage, namely, densified tailings, environmental desulphurization, covers built with tailings, and co-disposal of tailings and waste rock. Even if many aspects need to be optimized, these approaches can be considered today as interesting alternatives to conventional tailings management approaches.
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Kumar, Saurabh, Dr Prashant Garg, and Amandeep Singh. "A Study On The Influence Of Sodium Salt Solution On The Atterberg Limits And Swelling Of Bentonite Clay." Journal of University of Shanghai for Science and Technology 23, no. 10 (October 9, 2021): 332–41. http://dx.doi.org/10.51201/jusst/21/09609.
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Due to industrialization and subsequent rise in urbanisation, our groundwater system and geoenvironmental reserves are getting degraded due to detrimental effects of industrial wastes discarded off into the geo-environment. Basic components like water, air and soil all get degraded resulting unacceptable loss of their natural virtues like purity, renewability, stability, sustainability and tolerability. Major industrial effluents like salt solutions, chemicals, artificial dyes, heavy metals, pharmaceutical residues and sewages etc., are posing the major problems for the ecosystem and their subparts. Since, bentonite clay has peculiar characteristics of high swelling and high pollutant absorbing capacity along with low hydraulic conductivity, it is used as a geotechnical clay liner. However, the geotechnical parameters of bentonite get affected on interaction with cations present in salt solutions. This investigation was carried out in order to observe the influences of salt solutions on bentonite and the results obtained depicts that the varying salt concentrations have a definite influence on Atterberg limits, swelling of bentonite.
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Melkov, Dmitry, Vladislav Zaalishvili, Olga Burdzieva, and Aleksandr Kanukov. "Temporal and Spatial Geophysical Data Analysis in the Issues of Natural Hazards and Risk Assessment (in Example of North Ossetia, Russia)." Applied Sciences 12, no. 6 (March 9, 2022): 2790. http://dx.doi.org/10.3390/app12062790.
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The paper considers the aspects of hazard assessment within the framework of a generalized approach. The aim of the study is to improve the methodology for more accurate and detailed probabilistic assessments of risks of various nature. A complex hazard map is constructed in an example of the territory of the Republic of North Ossetia-Alania and the construction site of the Mamison resort. Based on the analysis of data on Quaternary formations and quantitative estimates, it was concluded that the natural average static environmental evolution proceeds in the mode of the dynamic balance of two factors: mountain building and the equivalent increase in denudation, of which about 90% is transported and deposited by river waters and winds outside the territory. The remaining 10% is deposited in intermountain depressions and river valleys in situ. Geodynamic and climatic factors of influence on the geoenvironment create the danger of excessive environmental impact and disruption of its equilibrium development under anthropogenic impacts, which must be taken into account in designing.
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Caisová, Lenka, Tomáš Bešta, Jiří Chlachula, Jiří Komárek, and Štěpán Husák. "Taxonomic investigations of cyanobacterial and algal flora from the Southern Altai, East Kazakhstan." Biodiversity: Research and Conservation 15, no. 1 (January 1, 2009): 13–22. http://dx.doi.org/10.2478/v10119-009-0021-3.
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Taxonomic investigations of cyanobacterial and algal flora from the Southern Altai, East KazakhstanThe study presents results of pilot investigations (2005-2007) of micro-vegetation biodiversity in marginally explored mountain and forest-steppe areas of southern Altai, East Kazakhstan. On the basis of morphological phenotypes and ecological demands a total of 351 taxa of cyanobacteria and algae were identified in the principal biotopes (rivers and streams, backwaters, irrigation channels, lakes, high-tundra periglacial and barren land settings, snow fields, and pedogenic /soil cover/environments) of the territorial topographic gradient of ca. 400-3900 m a.s.l. Microbiological records display a remarkable taxonomic variability, including several previously undescribed endemic species of algae adapted to locally specific geoenvironmental conditions. The present results show a major potential for future systematic phycological studies integrated in the complex nature monitoring and management strategy in protected areas of the Altai. The results also demonstrate a limited impact of modern human activity on the quality of local water sources with only minor present ecological risks in balance with the traditional lifestyles of pastoralist communities.
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Hussein, Saber, Hasan Arman, Dalal Al Shamsi, Ahmed Murad, and Ala Aldahan. "Chemical and Isotope Studies of Zakher Lake and Its Possible Risk on the Geoenvironment, Al Ain, United Arab Emirates." Academic Perspective Procedia 2, no. 2 (October 27, 2019): 78–82. http://dx.doi.org/10.33793/acperpro.02.02.4.
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This study concerns the occurrence of pollutants in Zakher Lake, Al Ain, UAE, which are relevant to the water supply and impact on ecosystem. Lake water and sediment samples were collected from the lake and were analyzed for different chemical and physical properties. In-situ measurements of temperature, pH, EC and TDS and Rn-222 activity were carried out using a WTW-COND-330I and RAD7 instrument with errors of < 5%. The analyses of trace and major elements were performed using inductively coupled plasma optical emission spectroscopy (ICP-OES) Varian 715 with errors < 5%. The results reveal high concentrations of Na, K, Mg and Ca, Fe, Mn, Al, Sr, Ba and Pb in water samples of the lake, which are higher than permissible limits for drinking and irrigation. Variable concentrations of these elements were found in the sediment samples. In addition, radon isotope (Rn-222) data in the lake water indicate activity values below the detection limit of the instrument. The high concentrations of major and trace elements support the idea that the water is polluted. The sources of water to the lake are considered mainly anthropogenic due to the relatively high activity of Rn-222 in surrounding groundwater wells that is not detected in the lake water. Consequently, the lake water is not suitable for drinking, domestic or irrigation purposes and may be considered as a source of environmental hazard in the area.
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Moubarak, Azza H., Mohamed O. Arnous, and Ahmed E. El-Rayes. "Integrated Geoenvironmental and Geotechnical Risk Assessment of East Port Said Region, Egypt for Regional Development." Geotechnical and Geological Engineering, September 24, 2020. http://dx.doi.org/10.1007/s10706-020-01571-4.
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Bechstein, Matthias, Amarjargal Gansukh, Boldbat Regzengombo, Oyun Byambajav, Lukas Meyer, Michael Schönfeld, Helge Kniep, et al. "Risk Factors for Cerebral Aneurysm Rupture in Mongolia." Clinical Neuroradiology, June 30, 2021. http://dx.doi.org/10.1007/s00062-021-01051-z.
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Abstract Purpose Identification of country-specific demographic, medical, lifestyle, and geoenvironmental risk factors for cerebral aneurysm rupture in the developing Asian country of Mongolia. First-time estimation of the crude national incidence of aneurysmal subarachnoid hemorrhage (aSAH). Methods A retrospective analysis of all intracranial digital subtraction angiographies (DSA) acquired in Mongolia during the 2‑year period 2016–2017 (1714 examinations) was performed. During this period, DSA was used as primary diagnostic imaging modality for acute severe neurological symptoms in the sole hospital nationwide dedicated to neurological patients. The catchment area of the hospital included the whole country. Patients with incidental and ruptured aneurysms were reviewed with respect to their medical history and living conditions. The data was used to install a Mongolian aneurysm registry. Results The estimated annual crude incidence of cerebral aneurysm rupture was 6.71 for the country of Mongolia and 14.53 per 100,000 persons for the capital region of Ulaanbaatar. Risk factors common in developed countries also applied for the Mongolian population: A medical history of hypertension, smoking or the presence of multiple aneurysms led to a higher relative risk of rupture. In contrast, female gender was not associated with a higher risk in this national cohort. Males pursuing a traditional nomadic living may exhibit a specifically high risk of rupture. Conclusion Disease management of over 200 individuals/year with aSAH constitutes a socioeconomic burden in Mongolia. Efforts to raise awareness of the risk factors hypertension and smoking among the Mongolian population are desirable. Measures to improve the nationwide availability of modern neurovascular treatment options are currently under consideration.
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Torabi Haghighi, Ali, Hamid Darabi, Zahra Karimidastenaei, Ali Akbar Davudirad, Sajad Rouzbeh, Omid Rahmati, Farzaneh Sajedi-Hosseini, and Björn Klöve. "Land degradation risk mapping using topographic, human-induced, and geo-environmental variables and machine learning algorithms, for the Pole-Doab watershed, Iran." Environmental Earth Sciences 80, no. 1 (December 29, 2020). http://dx.doi.org/10.1007/s12665-020-09327-2.
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AbstractLand degradation (LD) is a complex process affected by both anthropogenic and natural driving variables, and its prevention has become an essential task globally. The aim of the present study was to develop a new quantitative LD mapping approach using machine learning techniques, benchmark models, and human-induced and socio-environmental variables. We employed four machine learning algorithms [Support Vector Machine (SVM), Multivariate Adaptive Regression Splines (MARS), Generalized Linear Model (GLM), and Dragonfly Algorithm (DA)] for LD risk mapping, based on topographic (n = 7), human-induced (n = 5), and geo-environmental (n = 6) variables, and field measurements of degradation in the Pole-Doab watershed, Iran. We assessed the performance of different algorithms using receiver operating characteristic, Kappa index, and Taylor diagram. The results revealed that the main topographic, geoenvironmental, and human-induced variable was slope, geology, and land use change, respectively. Assessments of model performance indicated that DA had the highest accuracy and efficiency, with the greatest learning and prediction power in LD risk mapping. In LD risk maps produced using SVM, GLM, MARS, and DA, 19.16%, 19.29%, 21.76%, and 22.40%, respectively, of total area in the Pole-Doab watershed had a very high degradation risk. The results of this study demonstrate that in LD risk mapping for a region, topographic, and geological factors (static conditions) and human activities (dynamic conditions, e.g., residential and industrial area expansion) should be considered together, for best protection at watershed scale. These findings can help policymakers prioritize land and water conservation efforts.
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Qi, Shengwen, Ning Liang, Kongming Yan, Zili Dai, and Fawu Wang. "Report on the 18th International Symposium on Geo-disaster Reduction and the 4th Gu Dezhen Lecture, 20–22 November 2020, Beijing, China." Geoenvironmental Disasters 8, no. 1 (May 7, 2021). http://dx.doi.org/10.1186/s40677-021-00182-2.
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AbstractThe 18th International Symposium on Geo-disaster Reduction (ISGdR) was held on 20–22 November in Beijing, China, focusing on the theme of “Improving the Relationship between Geoenvironment and Society”. In this symposium, a high-level Gu Dezhen Lecture and a number of keynote and invited lectures provided a platform for scientists, industrial professionals and students to share their researches and exchange novel ideas on geo-disaster reduction in a hybrid way of offline and online.