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Parameter determination to calculate water environmental capacity in Zhangweinan Canal Sub-basin in China

Journal of environmental Sciences 2010年第6期22卷 904-907页

作者： Yingxia Li ,Ruzhi Qiu,Zhifeng Yang,Chunhui Li,Jingshan Yu State Key Laboratory of water Environment Simulation,School of Environment,Beijing Normal University,Beijing,100875,China. State Key Laboratory of water Environment Simulation School of Environment Beijing Normal University Beijing 100875 China

Zhangweinan canal sub-basin （ZWN） has the most serious water resource shortage and water pollution problems in north of China. To calculate the water environmental capacity in ZWN, determination methods for design flow rates and degradation coefficients were discussed in this study. Results showed that 90% and 50% hydrological guarantee flow rates were suitable to be the design flow rates for rainy and dry seasons, respectively. Degradation coefficients of CODMn and NH3-N were 0.25 day^-1 and 0.15 day^-1 for branch streams and 0.5 day^-1 and 0.25 day^-1 for mainstreams, respectively in ZWN. With one-dimensional water quality simulation model, water environmental capacities were calculated to be 82,139 tons/yr for CODMn and 2394 tons/yr for NH3-N in ZWN.

关键词： degradation coefficient design flow rate water environmental capacity Zhangweinan

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Flow Calculation of water environmental capacity Controlling Units in a Small watershed Based on GIS Technology

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Meteorological and environmental Research 2012年第3期3卷 42-45页

作者： LIU Chun-xiao WANG Li ZHANG Pei Research Center for environmental Policy & environmental Planning and Environment Impact Assessment Zhengzhou University Zhengzhou450002 China Zhengzhou University Zhengzhou 450002 China

[Objeetive] We aimed to calculate the flow of controlling units in a small watershed based on GIS technology. [Method] Hydrologic analysis on Qingyi River was conducted by using ArcGIS9.0, and the controlling units with response of water-land were divided according to the riv- er monitoring sections of Xuchang City; considering the wastewater entering the river and the water from its upper reach, the runoff of controlling sections in the driest month （ with guarantee rate of 90% ） was calculated by means of isoline, runoff coefficient and hydrologic analogy method, and the calculated value of Gaocun Bridge section in Linying was contrasted with the measured value in 2010. [Result] The results showed that the cal- culated value and measured value of Gaecun Bridge section in Linying in the driest month of 2010 were 6.03 and 5.93 m^3/s respectively, with relative error of 1.69%, which revealed that the result of calculated runoff was reasonable. [ Conclusion] The way to divide controlling units was reason- able, and the calculation result of runoff was accurate and can meet the precision of water environment capacity calculation.

关键词： water environmental capacity Controlling unit Runoff calculation China

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Variation Characteristics of water environmental capacity in Poyang Lake under the Scheduling of Three Gorges Reservoir

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Meteorological and environmental Research 2011年第3期2卷 46-48,52页

作者： OU Ming-liang1,2,ZHOU Wen-bin2,3,HU Chun-hua2,3 1.College of Civil and Environment Engineering,East China Institute of Technology,Fuzhou 344000,China 2.Key Laboratory of Environment and Resource Utilization in Poyang Lake,Ministry of Education,Nanchang 330031,China 3.Institute of environmental and Chemical Engineering,Nanchang University,Nanchang 330031,China

[Objective] The aim was to study the variation characteristics of water environmental capacity in Poyang Lake under the scheduling of Three Gorges Reservoir.[Method] Choosing chemical oxygen demand (COD),total nitrogen (TN) and total phosphorus (TP) as the control indexes of pollutants in Poyang Lake,the variation characteristics of water environmental capacity in Poyang Lake under the scheduling of Three Gorges Reservoir were analyzed based on the water environment mathematical models of organic compounds and nutrients.[Result] After the operation of Three Gorges Project,high water level in Poyang Lake lasted for a long time in flood season when Three Gorges Reservoir increased discharge volume,while water level went down obviously with the accelerating of recession flow when reservoir decreased discharge volume to store water,so Three Gorges Project had obvious effects on the hydrological regime of Poyang *** 2009,when Three Gorges Reservoir stored water,the water environmental capacity of COD,TN and TP in Poyang Lake in October decreased by 14.0%,15.4% and 15.4% compared with those before operation,while they increased by 3.64%,4.88% and 4.88% in August when reservoir discharged water to prevent flood.[Conclusion] The study could provide scientific foundation for the water pollution control and water environment management of lakes.

关键词： Three Gorges Project Poyang Lake water environmental capacity China

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Study on water environmental capacity of Shennongjia

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Meteorological and environmental Research 2014年第8期5卷 51-54页

作者： Ye Jing Cheng Chang Chen Tao School of Resources and environmental Sciences Hubei University

water environmental capacity is the important basis to set local and professional emission standards for waters, and is also the work basis of ecological planning. Firstly, the general information of river system in Shennongjia was introduced. Then, the concept and general model of water environmental capacity were elaborated. Finally, we used the analytical solution to estimate the water environmental capacities of COD and NH3-N in Shennongjia, and concrete measures for water environmental protection were put forward.

关键词： Shennongjia water environmental capacity Analytical solution China

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Impact of hydroelectric projects on river environment: Analysis of water quality changes in Ningxia Reach of Yellow River

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water Science and Engineering 2008年第2期1卷 66-75页

作者： Sun Dongpo Lu Ruili Song Yongjun Yan Jun Faculty of water Conservancy Engineering North China University of Water Conservancy and Electric Power Zhengzhou 450011 P. R. China School of Civil Engineering and water Conservancy Ningxia University l~nchuan 750021 P. R. China

In this paper, the relationship between hydroelectric projects and the river environment is analyzed. Recently, the large-scale regulation of runoff by large hydroelectric projects in the Ningxia Reach of the Yellow River has altered natural runoff processes, causing an increase in the probability of low discharge and an overall adjustment of riverbed evolution and river characteristics. During low-flow years, the combined effects of these two changes can weaken the self-purification capacity and reduce the water environmental capacity of the river. This is one of the main reasons for the recent decrease of water quality in the Ningxia Reach. This research shows that it is necessary to implement river training projects to maintain stable flow paths, not only for adjusting river regimes and for flood control, but also for increasing the self-purification capacity and the water environmental capacity of the river. Methods and proposals for coordinating the operation of hydroelectric projects with the protection of the river environment are presented in the interest of promoting sustainable development.

关键词： runoff adjustment hydroelectric project self-purification capacity fluvial process water environmental capacity

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