The reason of this research is to identify the favorable areas for copper, zinc, and lead mineralization in the western part of the 1:100,000 Tafresh geological Sheet in the Urmia-Dokhtar structural zone of Iran. Effe...The reason of this research is to identify the favorable areas for copper, zinc, and lead mineralization in the western part of the 1:100,000 Tafresh geological Sheet in the Urmia-Dokhtar structural zone of Iran. Effective data layers for mineralization, such as geology, geochemistry, structures, and satellite images, were analyzed and then integrated using the AHP-OWA method to identify favorable areas. Geochemical stream samples were analyzed by univariate, multivariate, and classical statistical methods and revealed the first, second, and third class anomalies for copper, zinc, and lead in the study region. Detection of hydrothermal alteration zones by Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) satellite imagery in various algorithms, such as Relative absorption Band Depth (RBD), Minimum Noise Fraction (MNF), and Least Square Fit (LS-Fit), shows that argillic, phyllic, propylitic, and iron oxide alterations develop around the faults in the area under study. The favorable areas for copper, zinc, and lead mineralization have been identified by a combination of evidence maps of lithology, faults, dikes, geochemistry, and alteration data layers. Field observations in the area under study have confirmed the results.展开更多
This paper presents a Geographic Information System (GIS) based multicriteria decision analysis approach for mapping accessibility patterns of housing development sites in Canmore, Alberta. The approach involves integ...This paper presents a Geographic Information System (GIS) based multicriteria decision analysis approach for mapping accessibility patterns of housing development sites in Canmore, Alberta. The approach involves integrating two multicriteria decision methods (Analytical Hierarchy Process and Ordered Weighted Aver-aging) in a raster GIS environment, and incorporating the linguistic quantifier concept as a method for ob-taining the order weights. The approach facilitates a wide range of location (decision) strategies to be gener-ated and examined. The aim of the study is to help the housing development authorities in addressing the uncertainty involved in the decision making process, achieving a better understanding of the alternative ac-cessibility patterns. It also assists the authorities in evaluating and prioritizing the potential housing devel-opment sites in terms of accessibility levels.展开更多
There were many developed urban areas have been established without well studied from the hazards perspective. However, Mokattam Plateau is one of the most vulnerable areas of frequent landslides and rock-falls disast...There were many developed urban areas have been established without well studied from the hazards perspective. However, Mokattam Plateau is one of the most vulnerable areas of frequent landslides and rock-falls disasters (Moustafa et al., 1991). So, an integrated analysis method is highly needed. Spatial analysis of Multi-criteria evaluation (MCE) provided an assessment of the hazards’ factors (i.e. faults, joints, lithology, slope, old wadies/surface drainage, and quarries) at Mokattam area. The data have been analyzed by the MCE, Analytical Hierarchy Process (AHP)/Ordered Weighted Average (OWA)/Weighted Linear Combination (WLC). The research found that the geological factors (faults, joints, and lithology) were the highest contributors by about 65% of the hazardous driving forces, while the geomorphological processes (slope and old wadies/surface drainage) were contributed by about 30%. In addition, the impact of the human activities such as random urbanization, excess use of irrigation water and the transportation are critical hidden drivers that affect the land instability and accelerates the landslides and rock-falls (Amasha, 2009). Therefore, the decision makers and urban planners have to consider the four scenarios of low risk-high tradeoff (MIDAND), and high risk-some tradeoff (MIDOR) in their disaster risk management plans. While the risk-taking (OR) option is highly recommended for the new urban development projects to ensure the sustainability and risk resilience. While the risk-averse (AND) scenario is not recommended.展开更多
文摘The reason of this research is to identify the favorable areas for copper, zinc, and lead mineralization in the western part of the 1:100,000 Tafresh geological Sheet in the Urmia-Dokhtar structural zone of Iran. Effective data layers for mineralization, such as geology, geochemistry, structures, and satellite images, were analyzed and then integrated using the AHP-OWA method to identify favorable areas. Geochemical stream samples were analyzed by univariate, multivariate, and classical statistical methods and revealed the first, second, and third class anomalies for copper, zinc, and lead in the study region. Detection of hydrothermal alteration zones by Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) satellite imagery in various algorithms, such as Relative absorption Band Depth (RBD), Minimum Noise Fraction (MNF), and Least Square Fit (LS-Fit), shows that argillic, phyllic, propylitic, and iron oxide alterations develop around the faults in the area under study. The favorable areas for copper, zinc, and lead mineralization have been identified by a combination of evidence maps of lithology, faults, dikes, geochemistry, and alteration data layers. Field observations in the area under study have confirmed the results.
文摘This paper presents a Geographic Information System (GIS) based multicriteria decision analysis approach for mapping accessibility patterns of housing development sites in Canmore, Alberta. The approach involves integrating two multicriteria decision methods (Analytical Hierarchy Process and Ordered Weighted Aver-aging) in a raster GIS environment, and incorporating the linguistic quantifier concept as a method for ob-taining the order weights. The approach facilitates a wide range of location (decision) strategies to be gener-ated and examined. The aim of the study is to help the housing development authorities in addressing the uncertainty involved in the decision making process, achieving a better understanding of the alternative ac-cessibility patterns. It also assists the authorities in evaluating and prioritizing the potential housing devel-opment sites in terms of accessibility levels.
文摘There were many developed urban areas have been established without well studied from the hazards perspective. However, Mokattam Plateau is one of the most vulnerable areas of frequent landslides and rock-falls disasters (Moustafa et al., 1991). So, an integrated analysis method is highly needed. Spatial analysis of Multi-criteria evaluation (MCE) provided an assessment of the hazards’ factors (i.e. faults, joints, lithology, slope, old wadies/surface drainage, and quarries) at Mokattam area. The data have been analyzed by the MCE, Analytical Hierarchy Process (AHP)/Ordered Weighted Average (OWA)/Weighted Linear Combination (WLC). The research found that the geological factors (faults, joints, and lithology) were the highest contributors by about 65% of the hazardous driving forces, while the geomorphological processes (slope and old wadies/surface drainage) were contributed by about 30%. In addition, the impact of the human activities such as random urbanization, excess use of irrigation water and the transportation are critical hidden drivers that affect the land instability and accelerates the landslides and rock-falls (Amasha, 2009). Therefore, the decision makers and urban planners have to consider the four scenarios of low risk-high tradeoff (MIDAND), and high risk-some tradeoff (MIDOR) in their disaster risk management plans. While the risk-taking (OR) option is highly recommended for the new urban development projects to ensure the sustainability and risk resilience. While the risk-averse (AND) scenario is not recommended.
