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  • Analysis of black water aggregation in Taihu Lake

    Black water aggregation (BWA) in Taihu Lake is a disaster for the lake environment.It is a phenomenon resulting from water environmental deterioration and eutrophication caused by accumulation of pollutants in the lake,according to research on the water quality,pollutants of BWA,and occurrence mechanisms of BWA.Dead algae are the material base of BWA,the polluted sediment is an important factor for the formation of BWA,and hydrological and meteorological conditions such as sun light,air temperature,wind speed,and water flow are the other factors that may lead to the formation of BWA.Thioether substances such as dimethyl trisulfide are the representative pollutants of BWA.Parameters such as chlorophyll-a,DO,pH,and water temperature are sensitive indicators of BWA.Measures such as algae collection,ecological dredging,pollution control,and water diversion from the Yangtze River to the lake,are effective,and strengthening aeration is an emergency measure to control BWA....

    2020-12-06 21:11:24浏览:39 blackwateraggregationqualityindicatorcontrolmeasureTaihuLake

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  • Technical analysis on the emergency handling of Tangjiashan barrier lake

    This paper gives a brief introduction to the emergency handling of Tangjiashan barrier lake. Some technologies for the application of geological and topographical data are summarized and the mechanism of formation of a barrier lake is analyzed. Based on the safety status evaluation, the dam breach flood point is calculated. The paper concludes with discussion of the practical effects of emergency handling scenarios and different drainage channel designs....

    2020-12-06 21:11:24浏览:21 应急处理方案技术分析堰塞湖安全现状评价应急处置形成机理地形数据溃坝洪水earthquakeTangjiashanbarrierLake

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  • The migration of total dissolved solids during natural freezing process in Ulansuhai Lake

    High total dissolved solids(TDS)content is one of the most important pollution contributors in lakes in arid and semiarid areas.Ulansuhai Lake,located in Urad Qianqi,Inner Mongolia,China,was selected as the object of study.Temperatures and TDS contents of both ice and under-ice water were collected together with corresponding ice thickness.TDS profiles were drawn to show the distribution of TDS and to describe TDS migration.The results showed that about 80%(that is 3.602x108 kg)of TDS migrated from ice to water during the whole growth period of ice.Within ice layer,TDS migration only occurred during initial ice-on period,and then perished.The TDS in ice decreased with increasing ice thickness,following a negative exponential-like trend.Within under-ice water,the TDS migrated from ice-water interface to the entire water column under the effect of concentration gradient until the water TDS content was uniform.In winter,6.044x 107 kg(16.78% of total TDS)TDS migrated from water to sediment,which indicated that winter is the best time for dredging sediment.The migration effect gives rise to TDS concentration in under-ice water and sediment that is likely to affect ecosystem and water quality of the Yellow River.The trend of transfer flux of ice-water and water-sediment interfaces is similar to that of ice growth rate,which reveals that ice growth rate is one of the determinants of TDS migration.The process and mechanism of TDS migration can be referenced by research on other lakes with similar TDS content in cold and arid areas....

    2020-11-11 22:33:38浏览:26 aridandsemiaridareasUlansuhaiLaketotaldissolvedsolids(TDS)migration

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  • Multi-indicator assessment of water environment in government environmental auditing

    This study focuses on a multi-indicator assessment methodology for governmental environmental auditing of water protection programs. The environmental status of Wuli Lake in China was assessed using the global indicators (driver-status-response) developed by the CSD, and four additional indicators proposed by the author- water quality, pollution load, aquatic ecosystem status and lake sediment deposition. Various hydrological, chemical, biological and environmental parameters were used to estimate the values of the indicators for assessment of environmental status of the lake based on time series data sets for twenty years. The indicators proposed can be customized to meeting the needs for particular assessment of water protection programs. This method can be used to evaluate the performance of national environmental protection programs and provide technical support for environmental auditors....

    2020-07-08 08:49:41浏览:16 EnvironmentalauditingindicatorspollutionloadLakeecosystem

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