Pub Date : 2024-06-04DOI: 10.20448/arees.v11i1.5695
Nguyen Thanh Hung, Vu Dinh Cuong, Nguyen Tien Thanh, Nguyen Van Hung, Trieu Quang Quan
Thua Thien Hue province is significantly affected by conditions of climate change and sea level rise. Located in central Vietnam, the province experiences various climate-related challenges that have a strong impact on its environment and communities. Furthermore, the complexity of hydrodynamic regimes at main estuaries is reasonably challenge for the development of socio-economic, especially in water transportation. As a large estuary of Thua Thien Hue province, Thuan An play a special role in flood drainage and waterway navigation of Huong River. Therefore, understanding the hydrodynamic regime of Thuan An estuary is crucial due to the continuous alterations in its morphology during monsoon seasons. Sedimentation within the estuary creates obstacles for the river mouth entering channel, while erosion affects the northern and southern coasts. These changes have direct implications for flood drainage and waterway navigation. To gain insights into the hydrodynamic regime, this study focuses on further interpretation the hydrodynamic regimes in Thuan An inlet using Delft3D model combined with ArcGIS tools. By combining scientific modeling and practical implications, this study contributes to a better understanding the hydrodynamics of Thuan An estuary, ultimately facilitating sustainable development and management of this vital waterway system. Importantly, proposed structure for flood drainage and navigation stability in Thuan An estuary is considered with the elongation of 2 jetties. The proposed measure shows that the flood drainage is insignificantly affected and the water level at mostly locations in the river is not changed.
{"title":"Hydrodynamic regimes and proposed structure for flood drainage and navigation stability in Thuan an estuary, Vietnam","authors":"Nguyen Thanh Hung, Vu Dinh Cuong, Nguyen Tien Thanh, Nguyen Van Hung, Trieu Quang Quan","doi":"10.20448/arees.v11i1.5695","DOIUrl":"https://doi.org/10.20448/arees.v11i1.5695","url":null,"abstract":"Thua Thien Hue province is significantly affected by conditions of climate change and sea level rise. Located in central Vietnam, the province experiences various climate-related challenges that have a strong impact on its environment and communities. Furthermore, the complexity of hydrodynamic regimes at main estuaries is reasonably challenge for the development of socio-economic, especially in water transportation. As a large estuary of Thua Thien Hue province, Thuan An play a special role in flood drainage and waterway navigation of Huong River. Therefore, understanding the hydrodynamic regime of Thuan An estuary is crucial due to the continuous alterations in its morphology during monsoon seasons. Sedimentation within the estuary creates obstacles for the river mouth entering channel, while erosion affects the northern and southern coasts. These changes have direct implications for flood drainage and waterway navigation. To gain insights into the hydrodynamic regime, this study focuses on further interpretation the hydrodynamic regimes in Thuan An inlet using Delft3D model combined with ArcGIS tools. By combining scientific modeling and practical implications, this study contributes to a better understanding the hydrodynamics of Thuan An estuary, ultimately facilitating sustainable development and management of this vital waterway system. Importantly, proposed structure for flood drainage and navigation stability in Thuan An estuary is considered with the elongation of 2 jetties. The proposed measure shows that the flood drainage is insignificantly affected and the water level at mostly locations in the river is not changed.","PeriodicalId":221858,"journal":{"name":"Asian Review of Environmental and Earth Sciences","volume":"10 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141387997","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}
Pub Date : 2023-12-21DOI: 10.20448/arees.v10i1.5251
Emina Ajanovic, Aida Korjenic
This paper concerns the analysis of the morphometric characteristics of the Miljacka river basin using the Digital Elevation Model of the terrain in the Geographical Information System. A quantitative geomorphological analysis of general characteristics was performed, whereby the analysis was supplemented with specific parameters of the drainage system, which are of linear, areal and relief characteristics. Standard mathematical formulas and software tools for Surface and Hydrology in the GIS software environment were used to estimate the mentioned parameters, using ArcMap 10.4. By working in the Arc Map program, a database system was created, with the use of a grid system, which offers the possibility of overlaying geospatial data, extracting certain parameters and their analysis and synthesis. The analyzed parameters are indicators of the shape and recent processes in the relief. They represent a supplement in the inventory and typification of relief forms, which, thanks to GIS software, have a geographic reference, which facilitates their correlation. The importance of the conducted analysis is reflected in the fact that the obtained data have a numerical value, are verifiable and can be applied multiple times in practice for the purposes of determining erosive processes, protecting and improving space and the living environment, solving water management problems, planning economic activities and drafting spatial plans.
{"title":"Quantitative morphometric analysis of a river basin using GIS techniques: Case study of Miljacka River, Bosnia and Herzegovina","authors":"Emina Ajanovic, Aida Korjenic","doi":"10.20448/arees.v10i1.5251","DOIUrl":"https://doi.org/10.20448/arees.v10i1.5251","url":null,"abstract":"This paper concerns the analysis of the morphometric characteristics of the Miljacka river basin using the Digital Elevation Model of the terrain in the Geographical Information System. A quantitative geomorphological analysis of general characteristics was performed, whereby the analysis was supplemented with specific parameters of the drainage system, which are of linear, areal and relief characteristics. Standard mathematical formulas and software tools for Surface and Hydrology in the GIS software environment were used to estimate the mentioned parameters, using ArcMap 10.4. By working in the Arc Map program, a database system was created, with the use of a grid system, which offers the possibility of overlaying geospatial data, extracting certain parameters and their analysis and synthesis. The analyzed parameters are indicators of the shape and recent processes in the relief. They represent a supplement in the inventory and typification of relief forms, which, thanks to GIS software, have a geographic reference, which facilitates their correlation. The importance of the conducted analysis is reflected in the fact that the obtained data have a numerical value, are verifiable and can be applied multiple times in practice for the purposes of determining erosive processes, protecting and improving space and the living environment, solving water management problems, planning economic activities and drafting spatial plans.","PeriodicalId":221858,"journal":{"name":"Asian Review of Environmental and Earth Sciences","volume":"56 27","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138949358","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}
Pub Date : 2023-03-20DOI: 10.20448/arees.v10i1.4539
Filatieva Elvira, Olha Fursova, Filatiev Mikhail
The theoretical part of the research methodology is developed according to the scheme of subsidence of points on the earth's surface relative to the projection of the face. The curve of the trajectory of the subsidence of the earth's surface is divided by characteristic points at different stages of subsidence of the earth's surface. Such stages include: the beginning of the displacement of the earth's surface, the active stage of displacement, the end of the active stage and the attenuation of the processes of subsidence of the earth's surface. According to the goal and the design scheme, on the basis of experimental data, we determined the parameters corresponding to the location of a point on the earth's surface where it began to settle. In relation to the scheme under consideration, three well-known dependencies were analyzed to describe the subsidence curve of the earth's surface: the exponential equation, the hyperbolic tangent function, and the logistic curve. Based on them, it was established that the main influencing factor determining the boundary of the dynamic half-mold is the depth of mining operations, and the boundary angles are practically independent of this parameter.
{"title":"Experimental determination of the boundaries of the influence of a stope working on the earth's surface","authors":"Filatieva Elvira, Olha Fursova, Filatiev Mikhail","doi":"10.20448/arees.v10i1.4539","DOIUrl":"https://doi.org/10.20448/arees.v10i1.4539","url":null,"abstract":"The theoretical part of the research methodology is developed according to the scheme of subsidence of points on the earth's surface relative to the projection of the face. The curve of the trajectory of the subsidence of the earth's surface is divided by characteristic points at different stages of subsidence of the earth's surface. Such stages include: the beginning of the displacement of the earth's surface, the active stage of displacement, the end of the active stage and the attenuation of the processes of subsidence of the earth's surface. According to the goal and the design scheme, on the basis of experimental data, we determined the parameters corresponding to the location of a point on the earth's surface where it began to settle. In relation to the scheme under consideration, three well-known dependencies were analyzed to describe the subsidence curve of the earth's surface: the exponential equation, the hyperbolic tangent function, and the logistic curve. Based on them, it was established that the main influencing factor determining the boundary of the dynamic half-mold is the depth of mining operations, and the boundary angles are practically independent of this parameter.","PeriodicalId":221858,"journal":{"name":"Asian Review of Environmental and Earth Sciences","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123442881","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}
Pub Date : 2023-01-30DOI: 10.20448/arees.v10i1.4439
Faraz Estelaji, Amirhossein Afshari Aghajari, Rahimov M. Zahedi
Assessment and planning of crisis management with the approach to natural flood disasters include many factors. In this regard, one of the basic principles of crisis management is based on the resilience of urban infrastructure against floods. This study developed strategies to increase resilience by flood zoning and crisis management. The investigation of the current situation shows that despite the efforts being made, the climatic and environmental conditions of the rivers, the settlements of the infiltration basin, the constructions, and the location inaccuracy of the following structures indicate many challenges in managing the current situation in various components of crisis management. In this regard, the main direction of this article is to evaluate the urban resilience of the Khuzestan region against floods based on a crisis management approach and technique for order preference by similarity to ideal solution (TOPSIS) and Fuzzy weighting methods using geographic information system (GIS).
{"title":"Flood zoning and developing strategies to increase resilience against floods with a crisis management approach","authors":"Faraz Estelaji, Amirhossein Afshari Aghajari, Rahimov M. Zahedi","doi":"10.20448/arees.v10i1.4439","DOIUrl":"https://doi.org/10.20448/arees.v10i1.4439","url":null,"abstract":"Assessment and planning of crisis management with the approach to natural flood disasters include many factors. In this regard, one of the basic principles of crisis management is based on the resilience of urban infrastructure against floods. This study developed strategies to increase resilience by flood zoning and crisis management. The investigation of the current situation shows that despite the efforts being made, the climatic and environmental conditions of the rivers, the settlements of the infiltration basin, the constructions, and the location inaccuracy of the following structures indicate many challenges in managing the current situation in various components of crisis management. In this regard, the main direction of this article is to evaluate the urban resilience of the Khuzestan region against floods based on a crisis management approach and technique for order preference by similarity to ideal solution (TOPSIS) and Fuzzy weighting methods using geographic information system (GIS).","PeriodicalId":221858,"journal":{"name":"Asian Review of Environmental and Earth Sciences","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133601708","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}
Pub Date : 2023-01-13DOI: 10.20448/arees.v10i1.4407
Barnabas O Morakinyo, S. Lavender, Victor Abbott
Detection of potentially gas flaring-related pollution on vegetation cover using remotely sensed data at 11 flaring sites in Rivers State, Nigeria is the emphasis of this research. 21 Landsat 7 Enhanced Thematic Mapper Plus (ETM ), and 4 Landsat 8 Operational Land Imager and Thermal Infrared Sensor (OLI-TIRS) data dated from 21/04/2000 to 05/02/2022 with 3 cloud cover were used. Normalized Differential Vegetation Index (NDVI) was retrieved from corrected Landsat 7 bands (1-4), and Landsat 8 bands (2-5). Corrected thermal band was used for the computation of Land Surface Temperature (LST). Change in NDVI (δNDVI450-60)m and LST ( δLST60-450m) were computed. NDVI values at 60 m from the stack show that as the year increases, NDVI values around the stack reduces to almost zero. Linear regression analysis was considered for (δ NDVI450-60)mN against ( δNDVI450-60)mE, (δNDVI450-60)mN against (δNDVI450-60)mS, and (δNDVI450-60)mN against (δNDVI450-60)mW. Only (δNDVI450-60)mN against (δNDVI450-60)mW give statistically significant results at 99 % confidence level (p-value 0.0016). (δNDVI450-60)mN,E,S,W against (δLST60-450)mN,E,S,W were considered and results show positive correlation but statistically insignificant. Based on the results of this research, it can be concluded that flaring-related pollution can be detected on vegetation cover using Landsat 7 and Landsat 8 data in the Niger Delta.
本研究的重点是利用遥感数据在尼日利亚河流州的11个燃烧点检测可能与天然气燃烧有关的植被污染。使用了21个Landsat 7 Enhanced Thematic Mapper Plus (ETM)数据和4个Landsat 8 Operational Land Imager and Thermal Infrared Sensor (OLI-TIRS)数据，数据日期为2000年4月21日至2022年2月5日，覆盖了3个云层。校正后的Landsat 7波段(1-4)和Landsat 8波段(2-5)反演归一化植被指数(NDVI)。采用校正后的热带计算地表温度。计算NDVI (δNDVI450-60)m和LST (δLST60-450m)的变化。60 m处的NDVI值表明，随着年份的增加，堆栈周围的NDVI值几乎为零。(δNDVI450-60)mN对(δNDVI450-60) mE、(δNDVI450-60)mN对(δNDVI450-60)mS、(δNDVI450-60)mN对(δNDVI450-60)mW进行线性回归分析。只有(δNDVI450-60)mN对(δNDVI450-60)mW在99%的置信水平上具有统计学显著性(p值0.0016)。(δNDVI450-60)mN、E、S、W与(δLST60-450)mN、E、S、W呈显著正相关，但差异无统计学意义。基于本研究的结果，可以得出结论，使用Landsat 7和Landsat 8数据可以检测到尼日尔三角洲植被覆盖上的燃烧相关污染。
{"title":"Detection of potentially gas flaring related pollution on vegetation cover and its health using remotely sensed data in the Niger delta, Nigeria","authors":"Barnabas O Morakinyo, S. Lavender, Victor Abbott","doi":"10.20448/arees.v10i1.4407","DOIUrl":"https://doi.org/10.20448/arees.v10i1.4407","url":null,"abstract":"Detection of potentially gas flaring-related pollution on vegetation cover using remotely sensed data at 11 flaring sites in Rivers State, Nigeria is the emphasis of this research. 21 Landsat 7 Enhanced Thematic Mapper Plus (ETM ), and 4 Landsat 8 Operational Land Imager and Thermal Infrared Sensor (OLI-TIRS) data dated from 21/04/2000 to 05/02/2022 with 3 cloud cover were used. Normalized Differential Vegetation Index (NDVI) was retrieved from corrected Landsat 7 bands (1-4), and Landsat 8 bands (2-5). Corrected thermal band was used for the computation of Land Surface Temperature (LST). Change in NDVI (δNDVI450-60)m and LST ( δLST60-450m) were computed. NDVI values at 60 m from the stack show that as the year increases, NDVI values around the stack reduces to almost zero. Linear regression analysis was considered for (δ NDVI450-60)mN against ( δNDVI450-60)mE, (δNDVI450-60)mN against (δNDVI450-60)mS, and (δNDVI450-60)mN against (δNDVI450-60)mW. Only (δNDVI450-60)mN against (δNDVI450-60)mW give statistically significant results at 99 % confidence level (p-value 0.0016). (δNDVI450-60)mN,E,S,W against (δLST60-450)mN,E,S,W were considered and results show positive correlation but statistically insignificant. Based on the results of this research, it can be concluded that flaring-related pollution can be detected on vegetation cover using Landsat 7 and Landsat 8 data in the Niger Delta.","PeriodicalId":221858,"journal":{"name":"Asian Review of Environmental and Earth Sciences","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115844487","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}
Pub Date : 2022-12-27DOI: 10.20448/arees.v9i1.4374
Ademila Omowumi
Qualitative construction materials in highway pavement prompted addition of cement at different proportion of 2 - 10% to lateritic soils for enhanced performance. Engineering geological tests were performed on the soil-cement mixture to determine their highway pavement suitability for durable road construction. Furthermore, modelling of the strength characteristics of the mixture presents the correlation between the structural properties and cement mix. Thus, increase in soil-cement California bearing ratio (CBR) and unconfined compressive strength (UCS) values with higher cement mix of 8%, revealed enhanced soil improvement. The soil strength is also affected by the curing period. Better quality strength characteristics obtained decreases pavement thickness with reduced cost in road construction. Relationship between the soil strength properties and cement mix content are represented by polynomial model. This reveals stronger bearing capacity of soil cement mix cured in 14 days with R2 ≥ 0.8. The lateritic soil cement mix at 8% cement content could serve as highway subbase and base construction materials. Cement mix having positive effects on soil geotechnical properties are indication of its effectiveness in enhancing volume stability of different soils. Prolong curing time is essential for compacted soil cement mix for enhanced geotechnical engineering properties and to improve the quality of lateritic soil used as road construction materials. Thus, cement-stabilized lateritic soil reduces cost of road construction, its persistent failure, human and environmental losses.
{"title":"Engineering Structural Strength Properties of Lateritic Soil-Cement Mix for Road Pavement Stability","authors":"Ademila Omowumi","doi":"10.20448/arees.v9i1.4374","DOIUrl":"https://doi.org/10.20448/arees.v9i1.4374","url":null,"abstract":"Qualitative construction materials in highway pavement prompted addition of cement at different proportion of 2 - 10% to lateritic soils for enhanced performance. Engineering geological tests were performed on the soil-cement mixture to determine their highway pavement suitability for durable road construction. Furthermore, modelling of the strength characteristics of the mixture presents the correlation between the structural properties and cement mix. Thus, increase in soil-cement California bearing ratio (CBR) and unconfined compressive strength (UCS) values with higher cement mix of 8%, revealed enhanced soil improvement. The soil strength is also affected by the curing period. Better quality strength characteristics obtained decreases pavement thickness with reduced cost in road construction. Relationship between the soil strength properties and cement mix content are represented by polynomial model. This reveals stronger bearing capacity of soil cement mix cured in 14 days with R2 ≥ 0.8. The lateritic soil cement mix at 8% cement content could serve as highway subbase and base construction materials. Cement mix having positive effects on soil geotechnical properties are indication of its effectiveness in enhancing volume stability of different soils. Prolong curing time is essential for compacted soil cement mix for enhanced geotechnical engineering properties and to improve the quality of lateritic soil used as road construction materials. Thus, cement-stabilized lateritic soil reduces cost of road construction, its persistent failure, human and environmental losses.","PeriodicalId":221858,"journal":{"name":"Asian Review of Environmental and Earth Sciences","volume":"108 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122543783","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}
Pub Date : 2022-12-14DOI: 10.20448/arees.v9i1.4339
Amadi Alolote Ibim, Amadi Kelvin Chijioke
The concept of sustainability has become integral to the environmental dialect within the building construction industry. At present, providing an avenue by which the construction industry can meet its sustainability obligations has remained a topical issue globally. An environmentally oriented movement toward sustainability in building construction, however, still hinges on the traditional principles of cost, quality, and performance. This paper x-rays the unethical performance traits evident in the construction industry in Nigeria and the project delivery practices by indigenous firms that significantly influence the quality and thus the sustainability of construction output. Issues associated with quality control compliance are statistically analysed to determine existing trends. Multivariate analysis is deployed to measure the degree to which quality control parameters explain the participation level of indigenous local contractors in executing government projects. The study mathematically expresses the relationship between quality control adherence and indigenous participation in the execution of government contracts. The statistical analysis shows that the five quality control independent variables (internal organizational factor; the level of enlightenment; adequacy of designs; conducting of relevant tests and supervisory adherence) explain 47% of the variation in the level of indigenous participation. Poor quality control associated with the execution of contracts by indigenous construction companies in Nigeria may thus partly account for the low level of indigenous participation evident in the construction industry.
{"title":"Quality Control Compliance as an Environmental Response to Sustainability in the Nigerian Construction Industry","authors":"Amadi Alolote Ibim, Amadi Kelvin Chijioke","doi":"10.20448/arees.v9i1.4339","DOIUrl":"https://doi.org/10.20448/arees.v9i1.4339","url":null,"abstract":"The concept of sustainability has become integral to the environmental dialect within the building construction industry. At present, providing an avenue by which the construction industry can meet its sustainability obligations has remained a topical issue globally. An environmentally oriented movement toward sustainability in building construction, however, still hinges on the traditional principles of cost, quality, and performance. This paper x-rays the unethical performance traits evident in the construction industry in Nigeria and the project delivery practices by indigenous firms that significantly influence the quality and thus the sustainability of construction output. Issues associated with quality control compliance are statistically analysed to determine existing trends. Multivariate analysis is deployed to measure the degree to which quality control parameters explain the participation level of indigenous local contractors in executing government projects. The study mathematically expresses the relationship between quality control adherence and indigenous participation in the execution of government contracts. The statistical analysis shows that the five quality control independent variables (internal organizational factor; the level of enlightenment; adequacy of designs; conducting of relevant tests and supervisory adherence) explain 47% of the variation in the level of indigenous participation. Poor quality control associated with the execution of contracts by indigenous construction companies in Nigeria may thus partly account for the low level of indigenous participation evident in the construction industry.","PeriodicalId":221858,"journal":{"name":"Asian Review of Environmental and Earth Sciences","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131864521","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}
Pub Date : 2022-07-26DOI: 10.20448/arees.v9i1.4070
Adolphe Kempena, Gampio Urbain Mbilou, Dhorjeanny Bissombolo, A. O. Gonçalves, F. Boudzoumou
This work aims to evaluate the water effect on the soils collapse potential. The laboratory tests based on the soils samples preparation determined the soils properties. Parameters such as water content, dry unit weight, degree of saturation, voids ratio and particles size distribution were determined. The collapse potential was analysed indirectly according to various researchers criteria. The results confirmed the high vulnerability of the study area to collapse. The oedometer tests determined the values of the collapse potential showing the conventional relationship between the collapse potential and the water content. It is noted that increasing water content leads to decrease soils strength to collapse, and the increasing progress of collapse poses a risk to constructions on silty sand. The collapse potential decreases with the increase in the relative density keeping the water content constant. This collapse potential caused by soil water content variation can be reduced from compaction.
{"title":"Prediction of the Strength Behaviour of the Sandy Soil by using Collapse Potential in the Kintele Site-Congo","authors":"Adolphe Kempena, Gampio Urbain Mbilou, Dhorjeanny Bissombolo, A. O. Gonçalves, F. Boudzoumou","doi":"10.20448/arees.v9i1.4070","DOIUrl":"https://doi.org/10.20448/arees.v9i1.4070","url":null,"abstract":"This work aims to evaluate the water effect on the soils collapse potential. The laboratory tests based on the soils samples preparation determined the soils properties. Parameters such as water content, dry unit weight, degree of saturation, voids ratio and particles size distribution were determined. The collapse potential was analysed indirectly according to various researchers criteria. The results confirmed the high vulnerability of the study area to collapse. The oedometer tests determined the values of the collapse potential showing the conventional relationship between the collapse potential and the water content. It is noted that increasing water content leads to decrease soils strength to collapse, and the increasing progress of collapse poses a risk to constructions on silty sand. The collapse potential decreases with the increase in the relative density keeping the water content constant. This collapse potential caused by soil water content variation can be reduced from compaction.","PeriodicalId":221858,"journal":{"name":"Asian Review of Environmental and Earth Sciences","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133896120","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}
Pub Date : 2022-03-17DOI: 10.20448/arees.v9i1.3786
V. Smalinskas, A. Vainoras, G. Ziubryte, G. Jaruševičius, M. Ragulskis, R. McCraty
The impact of the local Earth magnetic field (LEMF) on cardiovascular events has been studied recently. Data gathered during past years encouraged us to conduct this epidemiological analysis evaluating the association between changes in LEMF and hospital admissions due to AMI in Lithuania between August 2014 and September 2019. This study is unique due to its coverage of all Lithuanian patients. The frequency of morbidity of AMI was compared with the intensity of the LEMF and correlation coefficient was evaluated. The LEMF was measured by the Global Coherence Monitoring Network magnetometer located in Lithuania. LEMF was measured by pikotesla square (pT²). The LEMF was analized in five frequency ranges [Hz], generally called between Schumann resonance, which overlap with the human brain activity waves on electroencefalogram (EEG) frequency ranges (here, they are named as SDelta (0-3.5Hz), STheta (3.5-7Hz), SAlpha (7-15Hz), SBeta (15-32Hz) and SGamma (32-65Hz) to distinguish from the EEG bands). Significant correlations between weekly admissions of AMI cases and the weekly LEMF strength in five frequency ranges and in total range was found. A clear negative correlation was observed between cases of AMI in female group and LEMF frequency ranges SDelta (0-3.5Hz), STheta (3.5-7Hz), SAlpha (7-15Hz), SBeta (15-32Hz) and in total range. In the second half of the year the number of AMI is lower, therefore negative correlations between SDelta (0-3.5Hz), STheta (3.5-7Hz), SAlpha (7-15Hz) and SBeta (15-32Hz) ranges are stronger than in the first one. This is particularly noticeable in 2016 and 2018 years.
{"title":"Investigation of 5-Year Interconnections between Local Earth Magnetic Field Fluctuations and Acute Myocardial Infarction in Lithuania","authors":"V. Smalinskas, A. Vainoras, G. Ziubryte, G. Jaruševičius, M. Ragulskis, R. McCraty","doi":"10.20448/arees.v9i1.3786","DOIUrl":"https://doi.org/10.20448/arees.v9i1.3786","url":null,"abstract":"The impact of the local Earth magnetic field (LEMF) on cardiovascular events has been studied recently. Data gathered during past years encouraged us to conduct this epidemiological analysis evaluating the association between changes in LEMF and hospital admissions due to AMI in Lithuania between August 2014 and September 2019. This study is unique due to its coverage of all Lithuanian patients. The frequency of morbidity of AMI was compared with the intensity of the LEMF and correlation coefficient was evaluated. The LEMF was measured by the Global Coherence Monitoring Network magnetometer located in Lithuania. LEMF was measured by pikotesla square (pT²). The LEMF was analized in five frequency ranges [Hz], generally called between Schumann resonance, which overlap with the human brain activity waves on electroencefalogram (EEG) frequency ranges (here, they are named as SDelta (0-3.5Hz), STheta (3.5-7Hz), SAlpha (7-15Hz), SBeta (15-32Hz) and SGamma (32-65Hz) to distinguish from the EEG bands). Significant correlations between weekly admissions of AMI cases and the weekly LEMF strength in five frequency ranges and in total range was found. A clear negative correlation was observed between cases of AMI in female group and LEMF frequency ranges SDelta (0-3.5Hz), STheta (3.5-7Hz), SAlpha (7-15Hz), SBeta (15-32Hz) and in total range. In the second half of the year the number of AMI is lower, therefore negative correlations between SDelta (0-3.5Hz), STheta (3.5-7Hz), SAlpha (7-15Hz) and SBeta (15-32Hz) ranges are stronger than in the first one. This is particularly noticeable in 2016 and 2018 years.","PeriodicalId":221858,"journal":{"name":"Asian Review of Environmental and Earth Sciences","volume":"297 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116077699","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}
Pub Date : 2021-12-13DOI: 10.20448/journal.506.2021.81.68.76
E. E S, E. O S, Bekee D
The level of contamination of Orashi River by total petroleum hydrocarbons were investigated through the collection of surface water samples and sediment samples from four locations along the river. Determination of the level of contamination was done with the use of gas chromatography-flame ionization detector after following laid down clean-up procedures. The results obtained showed that total petroleum hydrocarbons in the surface water were 10.913±2.2022mg/L, 7.645±2.683mg/L, 9.074±2.1654mg/L and 12.212±3.3034mg/L for stations 1, 2, 3 and 4 respectively with a mean value of 9.961±2.5885mg/L, while in the sediment samples concentration values recorded were 22.3925±5.2104mg/Kg, 35.1071±9.9652mg/Kg, 50.4431±15.9916mg/Kg and 29.3869±8.0410mg/Kg for stations 1, 2 3 and 4 respectively with a mean value of 34.3324±9.8021mg/Kg. The partition coefficient calculations revealed that the sediment phase is more stable for total petroleum hydrocarbons as compared to the water phase. The analysis of the randomly collected samples revealed that total petroleum hydrocarbons have contaminated the river and therefore adequate steps should be taken to remedy the present condition of the Orashi River in order to mitigate any probable rise in the quantity of total petroleum hydrocarbons in the river above allowable limit.
{"title":"Total Petroleum Hydrocarbons Contamination of the Surface Water and Sediments of Orashi River, Engenni, Ahoada West, Rivers State, Nigeria","authors":"E. E S, E. O S, Bekee D","doi":"10.20448/journal.506.2021.81.68.76","DOIUrl":"https://doi.org/10.20448/journal.506.2021.81.68.76","url":null,"abstract":"The level of contamination of Orashi River by total petroleum hydrocarbons were investigated through the collection of surface water samples and sediment samples from four locations along the river. Determination of the level of contamination was done with the use of gas chromatography-flame ionization detector after following laid down clean-up procedures. The results obtained showed that total petroleum hydrocarbons in the surface water were 10.913±2.2022mg/L, 7.645±2.683mg/L, 9.074±2.1654mg/L and 12.212±3.3034mg/L for stations 1, 2, 3 and 4 respectively with a mean value of 9.961±2.5885mg/L, while in the sediment samples concentration values recorded were 22.3925±5.2104mg/Kg, 35.1071±9.9652mg/Kg, 50.4431±15.9916mg/Kg and 29.3869±8.0410mg/Kg for stations 1, 2 3 and 4 respectively with a mean value of 34.3324±9.8021mg/Kg. The partition coefficient calculations revealed that the sediment phase is more stable for total petroleum hydrocarbons as compared to the water phase. The analysis of the randomly collected samples revealed that total petroleum hydrocarbons have contaminated the river and therefore adequate steps should be taken to remedy the present condition of the Orashi River in order to mitigate any probable rise in the quantity of total petroleum hydrocarbons in the river above allowable limit.","PeriodicalId":221858,"journal":{"name":"Asian Review of Environmental and Earth Sciences","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126980549","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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