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The shallow groundwater around abandoned quarries is important resource for local industry and agriculture. In this study, 27 representative groundwater samples were collected from Fuli abandoned quarries area. The hydorchemical data were analyzed to reveal its geochemical mechanisms and groundwater quality. The groundwater is weakly alkaline in nature. The content of cations follow the trend: Ca2+ >Mg2+ >Na+ >K+, and anions follow the order: HCO3->SO42- >Cl->F-. The Ca2+ and HCO; are two leading ions, 96.30% of Ca2+and 100% of HCO3- have exceed desirable limit recommended by WHO. The groundwater is controlled by Ca-HCO3 and Ca.Mg-HCO3 type as main facies, Ca-HCO3.SO4 as secondary facies. The chemical composition is mainly controlled by dissolution of carbonate minerals, among which calcite is the leading mineral. Recharging analysis based on stable isotope concluded that atmospheric precipitation is the main recharge source of groundwater and influence of evaporation is relatively weak. The Standard US Salinity Laboratory classification shows that all the samples distributed in category C2-S1. Combined with the SAR, %Na, RSC, PI and Wilcox diagram, the groundwater is suitable for irrigation purpose. The outcomes provide a better understanding of hydrochemical mechanism of groundwater around abandoned quarries, and it will promote integrated management of groundwater. [ABSTRACT FROM AUTHOR]

The heavy metals of soil around Qianling abandoned cola mine, Northern Anhui province, China has exceeded local background values, posing a serious threat to human health. The enrichment factor (EF), Pollution load index (PLI) and human health risk model (USEPA) were applied to determine the pollution characteristics and risk of heavy metals in soil in this study. A total of 32 samples were collected from topsoil (0-10cm). Compared with the Anhui province background values, Zn and As are the most prominent polluted, followed by Pb. The Qianling abandoned coal mine are at high contaminated and severely contaminated degree, accounting for enrichment of Zn and As. For Non-carcinogenic risk, the heavy metals would not cause risk on adults, but risk of children cannot be ignored, and oral ingestion are the primary way. For carcinogenic risk, the heavy metals would cause risk on both adults and children. Moreover, oral ingestion is the main expose pathway for adults, and inhalation via nose and mouth and dermal contact are the insignificant pathway for children. The outcome of this study provide a better understanding and guidance for pollution control and human health. [ABSTRACT FROM AUTHOR]

Heavy metals in soils have severe effects on human health and ecosystem. The accurate pollution assessment and quantitative source analysis are significance for the prevention on soil. In this study, a total of 40 topsoil (0-15cm) samples were collected from 4 different functional areas in the study city and the content of 7 heavy metals were determined. This study use Kriging method to analysis spatial distribution. The Nemrow comprehensive pollution, Pollution load and Potential ecological hazard indexes were applied to assess the level of pollution and ecological risk, and positive matrix factorization(PMF) are conducted to source apportionment. The Pb, Cd and As are the most widely contaminated elements. The study area were suffered from moderate-severe pollution and moderate ecological risk, showing the decreasing order: industrial areas > business areas > residential areas > administrative areas. Four sources were apportioned, which were industrial activities (40.20%), atmospheric dustfall (23.23%), transportation (19.16%) and motor vehicle emission (17.39%). The outcomes of this research can serve as a basis for heavy metal treatment for government and will help in securing in city environment. [ABSTRACT FROM AUTHOR]

The UAV tilt photogrammetry is a method that can be used to obtain large-area and high-precision 3D point cloud data after remote sensing and 3D laser scanning, which has the advantages of low labor intensity, high efficiency and little impact on the environment. It is widely used in various fields, and is in the trial stage in reservoir measurement. In this research, Guniubei reservoir was taken as the study area. The RTK (real-time dynamic difference technology) was used to obtain the coordinates of ground control points. The aerial photogrammetry were carried out by Dajiang spirit 4 UAV (unmanned aerial vehicle), with 35 photo control points and 42 check points, and then 3D model of reservoir was established. Evaluated by mean square error, MS and MH of root control points were 0.051m and 0.065m respectively, and the MH of the detail points was 0.098m, which all met the accuracy requirements. For the tidal-flat area, the safety of UAV photogrammetry was much higher than that of manual field measurement. The outcomes of this research provide basis for comprehensive efficient topographic survey and reservoir capacity of hydraulic engineering. [ABSTRACT FROM AUTHOR]