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Xem 1-20 trên 167 kết quả Groundwater
  • Quantitative  distribution  of  main  ions  and  other  chemical  components  of  groundwater  are characterized by theirs statistical parameters. They depend closely on probability distribution of  the  data.

    pdf9p dem_thanh 22-12-2012 37 6   Download

  • This research was carried out to assess effectiveness of enforcement procedures for groundwater management policies in O Mon district of Can Tho city. The specific research objective were: assessment of groundwater level declining from 2000 to 2013; assessment effectiveness of groundwater policy and to propose solutions to improved effective groundwater management in the research area.

    pdf8p dangthitrangtrang 10-05-2018 13 1   Download

  • Fresh groundwater was found in the Pleistocene aquifer in the southern part of the Red River Delta in 70’s of last century. It is located mainly in the south of Nam Dinh province and small part in southeast of Ninh Binh province. The fresh-saline boundary seems to migrate southward recently and downsize the area of fresh groundwater.

    pdf10p truongtien_09 10-04-2018 6 0   Download

  • The study hasyielded a more comprehensive assessment of groundwater quality, allowing regulators to plan water resources more reasonably and be able togive in time advices tothe people.

    pdf10p hulk1234 01-06-2018 10 0   Download

  • As a result, correlation and calibration equations were established in which good reproducibility of the international standards was achieved with the value of first standard deviation less than 0.3 ‰ as well as the accuracy and precision of the measurements were obtained with errors less than 0.12 ‰. Based on these equations, 15 samples of groundwater collected from Cu Chi (Viet Nam) district were analyzed and calculated.

    pdf8p cumeo3000 01-08-2018 7 0   Download

  • In this study, a survey of current pollution was carried out to elucidate the distribution of some metal ions such as total iron, Al3+, As5+, Cu2+, Pb2+ and Zn2+ in groundwater in Go Vap District. The results showed that these metals are distributed mainly at mid-upper Pleistocene aquifer (qp2-3) from 8 meters to over 40 meters and in strongly to moderately acidic environment, which have pH from 4.2 to 5.0.

    pdf7p cumeo3000 01-08-2018 4 0   Download

  • In this paper a model for solute transport in groundwater, including physico-mathematical basis, numerical method some simple example simulations is briefly presented. This model has been gradually improved in both simulation and methodology.

    pdf9p chikychiky 27-10-2018 6 0   Download

  • In this study, the groundwater from a transect in the Northwestern area of Hanoi was examined. The results showed that 28.8% the wells of the B-B’ transect exceed the WHO guideline value for arsenic concentration in drinking water. The arsenic concentrations varied in a wide range from point to point, with the highest concentration found at Van Phuc and the lowest one found at Cam Yen. They also varied accordingly to the depth.

    pdf8p meolep1 28-11-2018 2 0   Download

  • Results calculated by the model seem to indicate that the conceptual hypotheses adopted are reasonable for the modelled domain and period. The simulation allows for calculation of the regional groundwater flow trends. It is also used for assessing the relative importance of the various recharge sources of the shallow aquifer system in Hanoi, and for estimating the interactions between groundwater and the Red River

    pdf20p everydaywish 24-12-2018 5 0   Download

  • Arsenic (As) contamination in groundwater has been recognized in the Mekong River Delta (MRD) since 2001, especially in Dong Thap and An Giang provinces. The investigations were carried out during 2008-2009 and from 2012 to present. The investigations of As distribution in groundwater and sediments were based upon the field, and laboratory analyses using field kit (Hironaka, 1998) and AOAC laboratory - Vietnamese standard 6626-2000 (Vilas).

    pdf10p meolep4 02-01-2019 3 0   Download

  • Extensive groundwater withdrawal in Hanoi during the last decades resulted in significant depletion of aquifer storages, which has been recorded at various locations in the Hanoi city. In conditions of rapid decrease of subsurface water resources efficient groundwater management is critical. This implies the necessity of precise evaluation of natural recharge as well as its sensitivity to various factors caused by area urbanization and prediction of its response to future land cover and land use changes.

    pdf5p vinobita2711 31-05-2019 0 0   Download

  • Objectives of research: Research on ammonia removal in groundwater in Hanoi with the concentration of less than 25mg/L (20mgN/L) by simultaneous Nitrification and Denitrification process in the equipment using MBBR with porous carriers (DHY) of a high surface area of about 6,000-8,000 m2 /m3 , high porosity and light weight, easily moving in water without addition of substrates.

    pdf26p xacxuoc4321 09-07-2019 1 0   Download

  • Located in the transition zone between highland and Mekong delta, HCM city has an average elevation of 0.0 to 2.0 m. In the Southeast, the city is boundered by the sea with a coastline of 30 km. Thus, HCM city often suffered from inundation especially in the rainy season and tide high period. Land subsidence possibly resulted from groundwater over-extraction had been doubted since some manifestations of ground surface sinking were observed at the well fields in the districts No. 6 and Binh Tan in 2004.

    pdf7p vicapital2711 02-08-2019 0 0   Download

  • Groundwater is an important resource that serves as a backbone of human development. In several regions, mostly in developing countries, groundwater from sedimentary and hard rock aquifers used for drinking is naturally contaminated with arsenic. In different countries in Asia such as India, Bangladesh, Cambodia, China, Nepal, Pakistan, Taiwan, Thailand and Vietnam, the situation of arsenic toxicity is alarming and severe health problems are reported amongst the inhabitants relying on groundwater as sources of water for drinking purposes....

    pdf299p 951628473 07-05-2012 65 23   Download

  • About 70% of the world’s population dwells in coastal zones. With the economic and population growth, the shortage in freshwater supply becomes increasingly acute. With surface water more and more depleted and polluted, coastal communities have turned to groundwater to make up for the shortfall. For domestic supply purposes, the percentage of groundwater use has increased to more than 40% on a worldwide basis.

    pdf282p crazy_sms 10-05-2012 52 10   Download

  • Bài giảng "Mô hình nước ngầm - Phần 2: Thực hiện trên máy tính" cung cấp cho người người học các kiến thức: Groundwater Vistas, hệ thống đơn vị, tạo một mô hình mới, lưới mô hình, nhập số liệu về hệ số truyền dẫn thủy lực , nhập số liệu giếng trong Layer,... Mời các bạn cùng tham khảo nội dung chi tiết

    ppt35p thangnamvoiva20 20-09-2016 38 9   Download

  • Vùng đất than bùn Minerotrophic bồn tự nhiên đối với asen (As) trong groundwaters: chúng loại bỏ Kể từ vùng nước đầu vào như họ tích lũy Như trong than bùn. Trong Gola di Lago (GdL), Canton Ticino, Thụy Sĩ, nồng độ trong than bùn rất cao (khoảng 150x) so với giá trị "nền". Nước suối vào đất than bùn này chứa lên đến 400 g / L Như, nhưng vùng biển rời khỏi đất than bùn chứa ít hơn 2 g / L

    pdf6p bengoan741 23-12-2011 41 8   Download

  • The field of groundwater hydrology and the discipline of hydrogeology have attracted a lot of attention during the past few decades. This is mainly because of the increasing need for high quality water, especially groundwater.

    pdf232p cucdai_1 16-10-2012 45 8   Download

  • Sinh thạch tín (As) đã được phát hiện ở groundwaters trong đồng bằng phù sa Terai (TAP) ở miền nam Nepal trong năm 1999. Đến cuối tháng 3 năm 2004, khoảng 245.000 giếng nước đã được thử nghiệm Như, trong đó mẫu khoảng 3% được tìm thấy đã vượt quá tiêu chuẩn tạm thời Nepal 50 g / L. Từ nghiên cứu chi tiết thực hiện tại điểm nóng huyện Nawalparasi,

    pdf8p bengoan741 23-12-2011 34 7   Download

  • Natural Arsenic in Groundwater: Occurrence, Remediation and Management – Bundschuh, Bhattacharya and Chandrasekharam (eds) © 2005, Taylor & Francis Group, London, ISBN 04 1536 700 X Implementation of safe drinking water supplies in Bangladesh C.F. Rammelt & J. Boes Faculty of Technology, Policy and Management, Delft University of Technology, Delft, Netherlands ABSTRACT: The normal focal point with the introduction of ‘new’ technologies is the technique itself despite numerous experiences that show that most problems evolve around its implementation process.

    pdf11p bengoan741 23-12-2011 41 7   Download



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