共查询到20条相似文献，搜索用时 31 毫秒
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Water Resources - A water resource allocation model coupling quantity and quality is a topic of concern in China. The water resources supply modelling is set up according to the water quality, and... 相似文献
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在充分收集有关资料的基础上研究青海湖1959-2000年间降水径流蒸发湖泊水位地下水补给量的动态变化建立水量平衡分析方程.青海湖水位在波动中持续下降42年来年平均水位累计下降了 3.32 m平均每年下降了0.079 m近年来下降的幅度减小. 同时青海湖储水量不断减少而湖区降水呈增加的趋势河川径流量地下水的入湖补给量 蒸发量呈现下降的趋势. 根据青海湖水平衡分析计算结果预测2010年青海湖流域耗水量将达1.27108m3为维护生态平衡和社会经济持续发展需要跨流域调水量引大济湖4.1108m3. 相似文献
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Ali A. Karimi Jeremy A. Redman Roberto F. Ruiz 《Ground Water Monitoring & Remediation》1998,18(2):150-158
A two-year pilot study involving the recharge of a ground water basin with reclaimed water was completed in the city of Los Angeles. The city's Department of Water and Power is planning to initiate several ground water recharge projects using reclaimed water in the near future. One such project is the Headworks Recharge Project, the focus of this paper, Approximately 1 cfs of the Los Angeles (LA) River water comprised of 70% tertiary treated reclaimed water was recharged on a two-day wet and five-day dry cycle. The recharge water was then extracted from the basin approximately 1000 feet downgradient. Results showed greater than 4-log removal of coliform bacteria, up to 87% reduction in TOC, and compliance of the product water with federal and state drinking water standards. Model simulation showed after 15 years of recharging 3000 acre-feet per year of the LA River water and extracting about 10,000 acre-feet from the basin, the product water would contain from 5% to 15% reclaimed water. This is well below the maximum allowable limit of 20% stipulated by the California regulation. 相似文献
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The development history of the accounting system of water supply in the USSR is presented. Various statistical abstracts of 1970–1998 on the water supply in the Russian Federation are analyzed. Reference data are shown to be in need of correction. The dynamics of waste, mine, and drain water disposal are considered. The change in water quality is shown to be inadequate to the reduction in the discharge of pollutants. 相似文献
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天津地区咸水层水位映震能力的检验 总被引：1，自引：0，他引：1
通过2006年7月文安M5．1级与2008年3月卢龙ML4．4级2次地震震例,检验了天津地区咸水层水位较强的映震能力,提出在当前地下水开采干扰背景下进一步扩大咸水层水位动态观测的意见。 相似文献
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Bruce A. Macler 《Ground Water Monitoring & Remediation》1995,15(4):77-84
The Safe Drinking Water Act directs EPA to promulgate requirements for disinfection of ground water-based drinking water systems. The Ground- water Disinfection Rule regulatory workgroup, made up of representatives from EPA, the states, and other interested parties, is actively considering the issues for the wide range of elements necessary to ensure a regulation that will protect public health and can be feasibly implemented. This regulation is likely to require disinfection of ground water sources and systems found to be contaminated or vulnerable to contamination. 相似文献
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Water Resources - External water exchange of bays of the lakes Onega (Kondopoga and Petrozavodsk bays) and Ladoga (Hiidenselkä Bay), considering the exchange with the lake water, was assessed... 相似文献
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太湖流域宜溧河地区水体水质状况及营养状态评价 总被引：17，自引：5，他引：17
宜溧河流域是太湖的主要集水流域，流域水体的水质状况及营养状态与太湖的水质状况与营养状态密切相关，本研究根据2000年12月14-15日以及2001年4月18-19日两次大规模的水质同步监测结果，对流域平原河网地区水体的水质状况及营养状态进行了系统综合的评价，评价结果表明：不管是平水期还是枯水期，河网水体的水质状况都较差，营养水平较高；在枯水期间，受多种因素的综合影响，水体的水质状况呈现恶化趋势，营养盐含量也有所升高。 相似文献
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平谷赵各庄井深200 m, 观测含水层为182 m以下的全井段, 是浅层冷水和深层热水的混合水。 受开采及降雨影响, 水位、 水温长趋势及年动态具有同步协调性变化, 地下水开采使井筒内冷水比例变小, 水位下降, 水温上升; 降雨渗入补给使流入观测井筒内冷水占比例变大, 水位上升, 水温下降, 但雨季结束, 井筒内冷水流入量变少, 井水温逐渐回升。 气压和固体潮使井筒与含水层间有水流运动, 水位出现周期性波动, 从而改变井筒内冷热水比例, 引起水温周期性变化的次生效应, 两者有短期同步协调变化。 不同种干扰因素造成了不同周期的变化影响, 在排除干扰, 提取地震异常信息时, 应选用不同方法及取样周期进行分析。 相似文献
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Crimean water resources are limited, failing to fully meet the drinking and economic needs of the region. Over 50 years, the problems of water resources in Crimea were solved by using Dnieper water supplied through North-Crimean Canal; however, after the integration of Crimea into Russia, Ukraine suspended water supply. At the aggravation of political situation between Russia and Ukraine, the situation in the water-management sphere in the Republic of Crimea looks very complicated. The water-management problems of Crimea should be solved based on its own potential. Groundwater resources are the leading factor of sustainable development of Crimean Region at the present stage. 相似文献
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byWillem Jan Zaadnoordijk 《Ground water》2009,47(5):723-726
The standard MODFLOW packages offer limited capabilities to model piecewise-linear boundary conditions to describe ground water–surface water interaction. Specifically, MODFLOW is incapable of representing a Cauchy-type boundary with different resistances for discharge or recharge conditions. Such a more sophisticated Cauchy boundary condition is needed to properly represent surface waters alternatively losing water through the bottom (high resistance) or gaining water mostly near the water surface (low resistance). One solution would be to create a new package for MODFLOW to accomplish this. However, it is also possible to combine multiple instances of standard packages in a single cell to the same effect. In this specific example, the general head boundary package is combined with the drain package to arrive at the desired piecewise-linear behavior. In doing so, the standard USGS MODFLOW version can be used without any modifications at the expense of a minor increase in preprocessing and postprocessing and computational effort. The extra preprocessing for creating the input and extra postprocessing to determine the water balance in terms of the physical entities from the MODFLOW cell fluxes per package can be taken care of by a user interface. 相似文献
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The aim of this work is to study the removal of fluoride from brackish polluted water using electrodialysis. The influence of several parameters such as flow rate, initial feed concentration, co‐existing ions, and initial pH on process efficiency were studied. This efficiency is evaluated by the removal rate, demineralization rate, and power consumption. The defluoridation process showed to be independent of pH of feed solution. Although the remained studied parameters plays a significant role on the defluoridation efficiency and mainly on the specific power consumption. The defluoridation of a contaminated real water sample was investigated so as to improve the efficiency of the process. The fluoride concentration could be reduced from 2.9 to 0.4 mg L−1 which was lower than World Health Organization (WHO) standard (1.5 mg L−1). Moreover the concentrations of different species in the obtained treated water are below the amounts recommended by WHO for drinking water. 相似文献
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S. V. Yasinskii I. A. Vishnevskaya S. I. Shaporenko T. S. Bibikova 《Water Resources》2018,45(4):490-502
A retrospective review of the current scientific publications on the problems of water protection zones at water bodies is given. The content of regulations on water protection zone in the RF Water Code 2006 now in force is interpreted. The legislations regarding the establishment of water protection zones and riparian buffer strips at water bodies in Russia and other countries are compared and analyzed. The technologies and specifics of the development of geoinformation system “Water Protection Zone and Riparian Buffer Strip of a Water Body” are demonstrated as applied to determining the boundary of the water protection zone and riparian buffer strip for the Uglich Reservoir. Assessment of the anthropogenic load onto a drainage basin within the water protection zone of the Uglich Reservoir and a method for geoecological zoning of its territory are considered as an example. 相似文献
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V. G. Samylina 《Water Resources》2018,45(5):813-818
Objective analysis of water resources development in the territory of Vologda oblast in period from 2005 to 2014 is given. It was found that water withdrawal from water sources decreased by 22.4%, wastewater discharge into water bodies decreased by 22.6%, and the total volume of recycling and successive water use increased by 2.0%. The dynamics of the distribution of water resources between economic sectors is given. Unreasonable water losses were identified in water use systems and their extent was assessed. The main directions in water economy in the production and domestic sectors are determined. Steps for improving the efficiency of water resources development in the region are proposed. 相似文献
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Adverse environmental changes in the condition of water sources and water supply systems as well as causes for these changes have been revealed using the results of analysis of economic development of Primorskii Krai over a long period of time. Some recommendations concerning the elimination of these causes have been proposed. 相似文献