scholarly journals Comparison and Analysis of Resource and Environmental Carrying Capacity of Typical Rare Earth Mining Areas in China

2021 ◽  
Author(s):  
Jingjing Bai ◽  
Xin Xu ◽  
Yaoting Duan ◽  
Guangyu Zhang ◽  
Zhe Wang ◽  
...  
Keyword(s):  
Rare Earth ◽  
Carrying Capacity ◽  
Evaluation Method ◽  
Comprehensive Evaluation ◽  
Fuzzy Comprehensive Evaluation ◽  
Mining Area ◽  
Mining Areas ◽  
Assignment Method ◽  
Environmental Carrying Capacity ◽  
Bayan Obo

Abstract Rare earth is a non-renewable and important strategic resource, and China is rich in rare earth resources. However, the process of massive exploitation has caused the migration, diffusion transformation and accumulation of pollution sources, which in turn has a profound impact on the ecological environment of mining areas. Accurate evaluation of resource and environmental carrying capacity (RECC) is important for the green development of mining areas. In this paper, the fuzzy comprehensive evaluation method based on AHP and entropy combination assignment method is used to study the RECC of mine area in terms of both support capacity and pressure. The Bayan Obo mine in Inner Mongolia; Longnan mine in Jiangxi; Weishan mine in Shandong; Mianning mine in Sichuan; Pingyuan mine in Guangdong; and Chongzuo mine in Guangxi, which have typical representatives, were selected for the horizontal comparison. The results show that, with the exception of Bayan Obo, the support index is greater than the pressure from mining and human activities in all the mining areas. The RECC index ranks for each mining area were: Bayan Obo > Longnan > Mianning > Pingyuan > Weishan > Chongzuo. In addition, an obstacle degree model was used to identify and extract the main factors affecting the ecological quality of the mine site. The ratio of investment in environmental pollution control to GDP is the most important factor limiting the improvement of the mine support index. The results of this paper were given for the different evolutionary processes and differences of RECC in typical rare earth mining areas, which could provide valuable references for achieving the green and comprehensive development of rare earth industry.

Eco-Environmental Carrying Capacity of Water in Upstream of Liao River Basins, China

2012 ◽  
Vol 518-523 ◽  
pp. 4849-4854
Author(s):  
He Wang
Keyword(s):  
Carrying Capacity ◽  
Evaluation Method ◽  
Comprehensive Evaluation ◽  
Fuzzy Comprehensive Evaluation ◽  
River Basins ◽  
Indicator System ◽  
Water Stream ◽  
Fuzzy Comprehensive Evaluation Method ◽  
Comprehensive Evaluation Method ◽  
Environmental Carrying Capacity

Eco-environmental carrying capacity of water comprehensively representing the resource and eco-environmental characteristics of water determines the carrying ability of nature ecosystem for socio-economic development. Fushun and Tieling section are chosen as upstream in Liao River Basin to compare the eco-environmental carrying capacity of these two water stream. In this paper, 11 indexes are selected to establish evaluating indicator system, and then use the fuzzy comprehensive evaluation method to calculate eco-environmental carrying capacity of water. Result demonstrated: the score value of water eco-environmental carrying capacity of Fushun section is greater than that of Tieling. The little advance of water eco-environmental carrying capacity of Fushun was due to its better nature eco-environment.

scholarly journals Evaluation of Airport Environmental Carrying Capacity: A Case Study in Guangzhou Baiyun International Airport, China

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Lili Wan ◽  
Qiuping Peng ◽  
Tianci Zhang ◽  
Zhan Wang ◽  
Yong Tian
Keyword(s):  
Carrying Capacity ◽  
Evaluation Method ◽  
Comprehensive Evaluation ◽  
Projection Pursuit ◽  
Indicator System ◽  
Development Mode ◽  
The Sustainable Development ◽  
International Airport ◽  
Environmental Carrying Capacity

In order to clarify the comprehensive operational capabilities of the airport and better plan the sustainable development mode of the airport, this paper studies the evaluation method of airport environmental carrying capacity. First, this paper proposes the concept of airport environmental carrying capacity by taking into account the complex characteristics of airports affected by multiple factors and then selects 16 representative evaluation indicators to construct an indicator system based on the Driving Force-Pressure-State-Response (DPSR) framework. Finally, the accelerated genetic algorithm-projection pursuit model is established to model a comprehensive evaluation index, which is used to calculate the airport environmental carrying capacity (AECC). The results of the case study show that the AECC of Guangzhou Baiyun International Airport (CAN) decreased year by year from 2008 to 2017, which is in line with the coordinated development level of CAN. By analysing the changing mechanism of AECC and indicators, we get 6 key influencing indicators that led to the continuous decline of AECC and put forward some political suggestions to improve the AECC.

The Distribution Laws of Interlayer-Gliding Structure Controlled by Panji Anticline and the Research of Quantitative Evaluation in Seams

2012 ◽  
Vol 204-208 ◽  
pp. 3-9
Author(s):  
Qi Lang Le
Keyword(s):  
Coal Mine ◽  
Evaluation Method ◽  
Comprehensive Evaluation ◽  
Fuzzy Comprehensive Evaluation ◽  
Mining Area ◽  
Fracture Type ◽  
Comprehensive Evaluation Method ◽  
Geological Conditions ◽  
Shallow Area ◽  
Gliding Structure

Based on the research of interlayer-gliding structures in Panbei and Panji No.1 coal mine that are located in the each wing of Panji anticline, the Panji mining area is divided into 9 main interlayer-gliding areas and 29 sub-regions. The results indicate that the interlayer-gliding structures mainly developed in the anticline wings, which show obvious symmetry at the type and distribution. The types of the interlayer-gliding structures are fault-sliding and corrugation type in the wings and fracture type in the core area. The type and manifestation of the interlayer-gliding structures also show symmetry in the similar depth. From up to down, the interlayer-gliding type show obvious regularity that fracture type is mainly developed in the shallow area, down is fault-sliding type and corrugation type is mainly developed in the deep or the interchange of the faults. Take fuzzy comprehensive evaluation method to evaluate the inter-gliding structure in west area of Panji No.1 coal mine. The results showed that the results from using fuzzy comprehensive assessment were similar with the results exposed by coal mine. Good effects were obtained for predicting the development intensity of the seam-gliding structure in deep unmined areas in combination with geological conditions of coal mine, providing references for production arrangement of coal mine.

scholarly journals The Application of an Improved Fuzzy Comprehensive Evaluation in Coal Quality Rating: The Case Study of China

2022 ◽  
Vol 9 ◽  
Author(s):  
Feng Cai ◽  
Lingling Yang ◽  
Yuan Yuan ◽  
Farhad Taghizadeh-Hesary
Keyword(s):  
Evaluation Method ◽  
Comprehensive Evaluation ◽  
Fuzzy Comprehensive Evaluation ◽  
Mining Area ◽  
Utilization Efficiency ◽  
Weighting Method ◽  
Coal Quality ◽  
Carbon Neutrality ◽  
Quality Stability ◽  
Quality Rating

Coal quality rating can help reduce greenhouse gas emissions, solving the global warming problem. It becomes more important as the carbon neutrality by the mid-21st century agreement is accepted by 195 countries, including China. In this paper, an improved fuzzy comprehensive evaluation method is introduced for coal quality rating. The data used in this work are of the Hostolgoi coalfield of the Xinjiang Province of China. Six industrial analysis indicators are determined as evaluation factors by taking the coal samples of different coal seam depths in the mining area. The super-standard multiple methods and the double-weight super-standard weighting method are combined to form a comprehensive weight. The results show that most of the coal samples of this coal mine are at grades I–II, and the overall coal is with good-quality stability. The evaluation results can improve the coal utilization efficiency and provide scientific guidance for evaluating and exploiting coal resources in coal geological exploration.

scholarly journals Key Factors Identification and Risk Assessment for the Stability of Deep Surrounding Rock in Coal Roadway

2019 ◽  
Vol 16 (15) ◽  
pp. 2802 ◽  
Author(s):  
Dongmei Huang ◽  
Weijun Li ◽  
Xikun Chang ◽  
Yunliang Tan
Keyword(s):  
Risk Assessment ◽  
Evaluation Method ◽  
Comprehensive Evaluation ◽  
Fuzzy Comprehensive Evaluation ◽  
Mining Area ◽  
Surrounding Rock ◽  
Risk Level ◽  
Affecting Factors ◽  
Key Factors ◽  
The Stability

In order to evaluate the stability of deep surrounding rock, all of the affecting factors should be theoretically identified. However, some factors have slight impacts on the stability of deep surrounding rock compared with others. To conduct an effective risk assessment, key factors should be first extracted. The analytic hierarchy process (AHP) and grey relation analysis (GRA) methods are integrated to determine the key factors. First, the AHP method is applied to sort the factors by calculating the weights of them. Seven out of fifteen factors are extracted as the key factors, which account for 80% of the weights. Further, the GCA method is used to validate the effects of these key factors by analyzing the correlation between the performance of each factor and that of the reference. Considering the influence of these key factors and experts’ judgements, the multilevel fuzzy comprehensive evaluation method is adopted to obtain the risk level of the deep surrounding rock stability. Finally, the risk assessment of the deep surrounding rock in the E-Zhuang coal mine of Chinese Xinwen Mining Area illustrates the operability of the proposed method.

Fuzzy Evaluation Method of Sustainable Development of Mining Area

2014 ◽  
Vol 587-589 ◽  
pp. 86-91
Author(s):  
Ri Jia Ding ◽  
Lu Yin
Keyword(s):  
Sustainable Development ◽  
Evaluation System ◽  
Evaluation Method ◽  
Comprehensive Evaluation ◽  
Evaluation Model ◽  
Fuzzy Comprehensive Evaluation ◽  
Mining Area ◽  
Actual Condition ◽  
Fuzzy Evaluation ◽  
The Sustainable Development

With respect to mining area, to establish an evaluation system that aims to reflecting its actual condition and assessing its sustainable development ability has been of importance. In this paper, we discussed the meaning of sustainable development and evaluation factors, and then built a fuzzy comprehensive evaluation model to evaluate the sustainable development condition of mining area.

Assessing the Carrying Capacity of Water Resources in Wuhan City, China

2014 ◽  
Vol 905 ◽  
pp. 357-361
Author(s):  
Huan Huan Jia ◽  
Guang Ming Yu
Keyword(s):  
Water Resources ◽  
Carrying Capacity ◽  
Evaluation Method ◽  
Comprehensive Evaluation ◽  
Supply And Demand ◽  
Fuzzy Comprehensive Evaluation ◽  
Utilization Efficiency ◽  
Wuhan City ◽  
Water Resources Carrying Capacity ◽  
Exploitation And Utilization

The carrying capacity of water resources is one of the focuses in water resources research, and it has an important significance in measuring the effects of water resources on regional development. Wuhan City is selected as an example in this study. Eight indexes are selected to assess the carrying capacity of water resources in Wuhan City in recent three years based on the fuzzy comprehensive evaluation method. The results show that the degree of exploitation and utilization of water resources is relative high, and the potential of carrying capacity is relatively small. In addition, the contradiction between supply and demand of water resources is outstanding, and it tends to overload. The fundamental measures are put forward to improve water resources carrying capacity such as improving the utilization efficiency of water resources and enhancing the capacity of water saving from the perspective of promoting economic and social development

scholarly journals Hydrogeochemical Characteristics and Water Quality Evaluation of Carboniferous Taiyuan Formation Limestone Water in Sulin Mining Area in Northern Anhui, China

2019 ◽  
Vol 16 (14) ◽  
pp. 2512 ◽  
Author(s):  
Meichen Wang ◽  
Herong Gui ◽  
Rongjie Hu ◽  
Honghai Zhao ◽  
Jun Li ◽  
...  
Keyword(s):  
Water Quality ◽  
Comprehensive Evaluation ◽  
Water Source ◽  
Fuzzy Comprehensive Evaluation ◽  
Mining Area ◽  
Mining Areas ◽  
Taiyuan Formation ◽  
Development And Utilization ◽  
Huaibei Coalfield ◽  
Type Water

The Taiyuan formation limestone water in the Huaibei coalfield is not only the water source for coal mining, but also the water source for industry and agriculture in mining areas. Its hydrogeochemical characteristics and water quality are generally concerning. In this paper, conventional ion tests were carried out on the Taiyuan formation limestone water of 16 coal mines in the Sunan and Linhuan mining areas of the Huaibei coalfield. Piper trigram, Gibbs diagram and an ion scale coefficient map were used to analyze the hydrogeochemical characteristics of the Taiyuan formation limestone water. The water quality was evaluated in a fuzzy comprehensive manner. The results show that the main cation and anion contents in the Taiyuan formation limestone water were Na+ > Mg2+ > Ca2+ > K+, SO42− > HCO3− > Cl−. There were differences in the hydrogeochemical types of the Taiyuan formation limestone water in the two mining areas; HCO3-Na type water was dominant in the Sunan mining area and SO4·Cl-Na type water was dominant in the Linhuan mining area. The chemical composition of the Taiyuan formation limestone water is mainly affected by the weathering of the rock and is related to the dissolution of the evaporated salt and the weathering of the silicate. The fuzzy comprehensive evaluation results show that the V-type water accounts for a large proportion of the Taiyuan formation limestone water in the study area and the water quality is poor. This study provides a basis for the development and utilization of the Taiyuan formation limestone water and water environmental protection in the future.

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