scholarly journals Control and Application of Terrain Curvature on Dynamic Disasters: A Case Study of Coal and Gas Outbursts in the Pingdingshan Mining Area, China

2021 ◽  
Vol 2021 ◽  
pp. 1-6
Author(s):  
Dequan Sun ◽  
Ying Chen ◽  
Xiaoyan Li ◽  
Chunhui Huang ◽  
Huairui Su ◽  
...  
Keyword(s):  
Risk Evaluation ◽  
Positive Curvature ◽  
Mining Area ◽  
Tectonic Stress ◽  
Tectonic Activity ◽  
Curvature Radius ◽  
Field Variation ◽  
Preliminary Assessment ◽  
Coal And Gas Outbursts

Based on coal and gas outburst mining area topography, a risk evaluation index for mine dynamic disasters in relation to terrain curvature is presented by analyzing the terrain curvature formation and determining its classification and computational methods. Clarifying the mechanism that the terrain curvature changes reflects the intensity of tectonic activity and the tectonic stress field variation, as well as coal and rock mass energy storing. By using the N-shaped landform in the Pingdingshan coal mine as a case study, an area having strong tectonic activity and coal and gas outbursts was recorded to occur where terrain curvature changed, notably occurring where the positive curvature radius was 80.21% of the total. These findings indicate that terrain curvature has significant controlling effects on coal and gas outbursts. A preliminary assessment for the occurrence risk of coal and gas outbursts using the terrain curvature value is proposed which can be used as an effective method to predict future outbursts.

Risk evaluation of groundwater leakage in coal seam goaf: a case study in the Lingxin Mining Area

2020 ◽  
Vol 27 (21) ◽  
pp. 26066-26078
Author(s):  
Lianzhi Yang ◽  
Jianjian Xu ◽  
Jie Fang ◽  
Zhiguo Cao ◽  
Tianxin Li ◽  
...  
Keyword(s):  
Coal Seam ◽  
Risk Evaluation ◽  
Mining Area ◽  
Groundwater Leakage

scholarly journals The Problem of Carbon Dioxide Emissions from Closed Coal Mine Shafts – The Overview and the Case Study

2016 ◽  
Vol 61 (3) ◽  
pp. 587-600
Author(s):  
Paweł Wrona ◽  
Józef Sułkowski ◽  
Zenon Różański ◽  
Grzegorz Pach
Keyword(s):  
Carbon Dioxide ◽  
Carbon Dioxide Emissions ◽  
Carbon Dioxide Emission ◽  
Mining Area ◽  
Emission Point ◽  
Water Pumping ◽  
Gas Hazard ◽  
Flow Through ◽  
Reporting Procedures

Abstract Greenhouse gas emissions are a common problem noticed in every mining area just after mine closures. However, there could be a significant local gas hazard for people with continuous (but variable) emission of these gases into the atmosphere. In the Upper Silesia area, there are 24 shafts left for water pumping purposes and gases can flow through them hydraulically. One of them – Gliwice II shaft – was selected for inspection. Carbon dioxide emission with no methane was detected here. Changes in emission and concentration of carbon dioxide around the shaft was the aim of research carried out. It was stated that a selected shaft can create two kinds of gas problems. The first relates to CO2 emission into the atmosphere. Possible emission of that gas during one minute was estimated at 5,11 kg CO2/min. The second problem refers to the local hazard at the surface. The emission was detected within a radius of 8m from the emission point at the level 1m above the ground. These kinds of matters should be subject to regular gas monitoring and reporting procedures.

The Distribution Regularity of Geohazard in the Dry-Hot Valley of Jinsha River: Case Study in Derong County

2012 ◽  
Vol 518-523 ◽  
pp. 5754-5759
Author(s):  
Dong Jian Xue ◽  
Zheng Wei He ◽  
Xiang Dong Zheng
Keyword(s):  
Economic Development ◽  
Tectonic Activity ◽  
Human Engineering ◽  
Monsoon Climate ◽  
Jinsha River ◽  
Physical Weathering ◽  
Geological Conditions ◽  
Vertical Zone ◽  
Landslide Debris

Derong County is located in Ganzi Tibetan Autonomous Prefecture in southern part of Sichuan Province, in the upper of the Jinsha River, where there is a subtropical plateau monsoon climate, abundant sunshine, and large amount of evaporation, so it is a typical dry-hot valleys region. Derong County is the area of more ups and downs in the terrain, deep valleys, steep mountains, complex geological conditions, intense tectonic activity, various climate types, and has obvious vertical zone effect by temperature, serious physical weathering of rock, and landslide, debris flow, collapse and other geohazards are easily induced under the influence of rainfall and human engineering activities. These geohazards have brought serious harm to the people's lives and property, and have a great impact on the socio-economic development. Through the analysis of geohazards in the study area to investigate its distribution and development trends, this paper provide a basis for geohazard prevention and economic development.

Ecological and human health risk evaluation using pollution indices: A case study of the largest mangrove ecosystem of Bangladesh

2021 ◽  
pp. 101913
Author(s):  
Md. Solaiman Hossain ◽  
M. Belal Hossain ◽  
Md. Refat Jahan Rakib ◽  
Y.N. Jolly ◽  
Md. Akram Ullah ◽  
...  
Keyword(s):  
Health Risk ◽  
Human Health ◽  
Risk Evaluation ◽  
Human Health Risk ◽  
Mangrove Ecosystem ◽  
Pollution Indices ◽  
Health Risk Evaluation

scholarly journals Applications of Vitrinite Anisotropy in the Tectonics: A Case Study of Huaibei Coalfield, Southern North China

2012 ◽  
Vol 2012 ◽  
pp. 1-16
Author(s):  
Yudong Wu ◽  
Quanlin Hou ◽  
Yiwen Ju ◽  
Daiyong Cao ◽  
Junjia Fan ◽  
...  
Keyword(s):  
North China ◽  
Vitrinite Reflectance ◽  
Eastern China ◽  
Tectonic Stress ◽  
Deformation Mechanisms ◽  
Thermal Metamorphism ◽  
Regional Tectonic ◽  
Projection Analysis ◽  
Huaibei Coalfield

29 oriented and 10 nonoriented coal samples are collected in the study from three different regions of the Huaibei coalfield, eastern China, and their vitrinite reflectance indicating surface (RIS) parameters are systematically calculated and analyzed. Using the available methods, Kilby’s transformations and RIS triaxial orientations are obtained. The magnitudes and orientations of the RIS axes of the three regions were respectively projected on the horizontal planes and vertical sections. The results show that the samples in high deformed region have significant anisotropy magnitudes (higher Bw/Rmax and Ram values) with a biaxial negative style, whereas the samples in the slightly deformed area have unimpressive anisotropy magnitudes with a biaxial negative style. Thermal metamorphism superposed might enhance the complication and variation of RIS style. RIS projection analysis deduced that the RIS orientation is mainly controlled by regional tectonic stress, and likely influenced by deformation mechanisms of coal.

scholarly journals INTRODUCING A METHOD OF URBAN SOIL RISK EVALUATION – A CASE STUDY ON URBAN RECREATIONAL AREAS IN CLUJ NAPOCA

2016 ◽  
Vol 20 (4) ◽  
Author(s):  
ANDRA CRISTINA GAGIU ◽  
ELENA MARIA PICA ◽  
CLAUDIU TANASELIA ◽  
MONICA URSU
Keyword(s):  
Urban Soil ◽  
Risk Evaluation ◽  
Quantitative Method ◽  
Assessment Method ◽  
Soil Samples ◽  
Risk Assessment Method ◽  
Pollution Management ◽  
Potential Risks ◽  
The City

Assessing risks related to urban soil contamination represents a key part of pollution management. The current research proposes a quantitative method that defines and highlights unacceptable risks. The applicability of the method is presented in a case study on several urban recreational areas from the city of Cluj-Napoca, Romania. Concentrations of As, Cu, Cd, Zn, Pb, Hg, Co, Ni and Mg were identified in a number of 48 soil samples from 12 intensively used recreational areas in Cluj-Napoca. The proposed risk assessment method is applied, and potential risks are calculated for all locations.

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