Browsing by Author "Hersi, Naima A. M."
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Item Determining the quality of mine gushing and mixed water using coupled AHP and fuzzy comprehensive evaluation methods(Scientific Research Publishing, 2018) Wang, Junzhi; Zhao, Wei; Wang, Xinyi; Hersi, Naima A. M.; Zhang, Pingqing; Sang, Xiangyang; Mine gushingThis study focused on analysis of the chemical characteristics of mine waters. The aim of this study is to correlate the degree of different ionic components in mine water and the influence of their convergence using a combination of the three-scale AHP and fuzzy evaluation methods for the comprehensive evaluation of water quality. Ion chromatography (ICS 1100) has been used to analyze the content of the water sample while portable pH/EC/TDS/Tem- perature meters (SX 811 and SX 813) were used to test physical-chemical parameters. The results of this study show that chemistry of in No.11 gushing mine is dominated by HCO3-Na and HCO3-Ca, and had a pH between 7.1 and 8.00, belonging to neutral or slightly alkaline water. In addition, water were found to have the hardness between 18 mg/L and 542.5 mg/L. Results also show that the TDS of the roof sandstone and goaves water are higher than Cambrian limestone water, while the turbidity of the mixed water is 20 NTU in the sump, again higher than in other samples such as Cambrian limestone water. Total dissolved solids and the total hardness of Cambrian limestone groundwater mainly depend on the content of K+ + Na+, Ca2+, and SO42- . Thus, chemical composition changes remarkably after mine water mixing. Results showed that the coal roof sandstone water is class V while that in the sump is class III, and the Cambrian limestone groundwater is class I. In gushing, the quality of water can vary greatly; thus, water from the coal face roof sandstone and the Cambrian limestone should be stored and treated separately before being utilized.Item Flood-risk zoning based on analytic hierarchy process and fuzzy variable set theory(American Society of Civil Engineers, 2019) Jia, Junxia; Wang, Xinyi; Hersi, Naima A. M.; Zhao, Wei; Liu, YongheThis study investigated torrential rain and waterlogging disasters in Henan Province combining the analytic hierarchy process method with the theory of fuzzy variable sets, and applying ArcGIS technology. The study focused on the possibility of hazard factors, sensitivity of the disaster environment, vulnerability of disaster-bearing bodies, capacity for disaster prevention and mitigation, and comprehensive risk of disaster. The following conclusions were drawn. The possibility of hazard factors increased gradually from northwest to southeast, and the highest possibility of hazard factors was mainly in the southern part of Zhumadian and the northern part of Xinyang. The sensitivity of the disaster environment increased gradually from west to east. The most sensitive zones were in eastern areas where there is a relatively low topography, including Anyang, Puyang, Hebi, Shangqiu, and Zhoukou. The vulnerability of disaster-bearing bodies in the east is higher than that in the west. The most vulnerable areas of disaster-bearing bodies are in Shangqiu, Kaifeng, Zhoukou, Luohe and Zhumadian in plain areas. Areas with the highest capacity for disaster prevention and mitigation are those which are economically stable. In Henan, areas located in Zhengzhou and Xuchang have high capacity for disaster prevention and mitigation, whereas hilly and mountainous areas, especially at the junction of the three cities of Sanmenxia, Luoyang, and Nanyang, have the lowest capacity for disaster prevention and mitigation. From northwest to southeast, the comprehensive risk of rainstorm and flood disaster increases gradually. Xinyang, located in the southernmost part of the region, has the highest risk and belongs to the disaster-stricken high-risk area.