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以长江源区为例,概略介绍了地硬信息系统在该区域的应用前景及方法。地理信息系统的应用可为水土流失动态提供丰富的信息,大大缩短更新的周期,对于水土流失数据处理、规划、应用建模以及大面积治理,具有实际指导意义。 相似文献
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为了揭示悬浮泥沙(SSC)对水库水质的影响规律,对汾河水库进行样品收集和长期水质监测,采用水动力模型与泥沙转移和富营养化模型相结合的方法,将这三者关联耦合,并通过实测数据对模型进行参数率定和验证,分析含沙水和不含沙水中总氮(TN)、总磷(TP)、叶绿素a(Chla)、溶解氧(DO)四项指标,得出两者对水质造成的影响。结果表明:SSC对TN、TP的去除作用明显,对Chla、DO浓度分布影响较小,并计算了污染物的释放量以及贡献率,得出TP的负荷仅为16.47t,而贡献率高达25.25%。因此在汾河的污染控制方面应侧重削减磷,进而改善汾河地区的污染现状。 相似文献
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为了揭示悬浮泥沙(SSC)对水库水质的影响规律,对汾河水库进行样品收集和长期水质监测,采用水动力模型与泥沙转移和富营养化模型相结合的方法,将这三者关联耦合,并通过实测数据对模型进行参数率定和验证,分析含沙水和不含沙水中总氮(TN)、总磷(TP)、叶绿素a(Chla)、溶解氧(DO)四项指标,得出两者对水质造成的影响。结果表明:SSC对TN、TP的去除作用明显,对Chla、DO浓度分布影响较小,并计算了污染物的释放量以及贡献率,得出TP的负荷仅为16.47t,而贡献率高达25.25%。因此在汾河的污染控制方面应侧重削减磷,进而改善汾河地区的污染现状。 相似文献
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水利实际上是除水害兴水利的一项环境、生态改善工程,邱庄水库是唐山市主要水源地之一.由于水库上游流域比较严重的水土流失以及生活污染源的影响,对水库功能造成了一定的隐患.要统筹规划,编制流域水资源综合规划,处理好工业、农业、渔业的关系,保护水质. 相似文献
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利用综合水质标识指数法,参照湖泊(水库)富营养化评价指标,选取总氮(TN)、总磷(TP)、高锰酸盐指数(CODMn)、叶绿素(a)、透明度(D)等5项指标,对升钟水库2006--2010年水体富营养化进行评价。结果表明:综合水质指数,埘排序为3.231_2010〈3.741_2009〈4.042_2007〈4.35_2006〈4.652_2008(指数越大,水质越差);升钟水库近5年综合水质标识指数在不同的时点上具有“高-低”演化规律,总体趋向好转;2008年的指数最大,富营养化最严重,2006-2008年水质指数呈波动变化,2009年、2010年水质有所改善;综合水质标识指数k随时间t变化的二次函数关系式为:I_wq=-0.1372t2+550.8t-552742;升钟水库水体氮、磷严重超标。 相似文献
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四川升钟水库水质评价及污染负荷分析 总被引:2,自引:0,他引:2
选取高锰酸盐指数(CODMn)、五日生化需氧量(BOD5)、总氮(TN)、总磷(TP)4项监测指标,采用单因干评价法、综合污染指数法、内梅罗污染指数法、模糊综合评价法及水质标识指数法对升钟水库2004~2010年水污染特征进行分析与评价,结果表明:水质标识指数法比较适合升钟水库水体富营养化评价;单因子水质标识指数显示,水库主要污染物为总氮(TN)、总磷(TP),基本呈现富营养状态;2008年水质最差,2010年水质达到Ⅱ类标准;7年Iwq的平均值Ave(Iwq)=3.393,Ave(Iwq)未达到国家Ⅱ类水质标准。近7年综合水质标识指数(Iwq)在不同时点上具有高-低演化规律,总体趋向好转。通过计算2006年N、P污染负荷,TN、TP入库主要源于水产养殖,其贡献率分别为:55%、82%,升钟水库TN、TP是合理容量的1.97~2.32倍。应严格控制水库网箱肥水养殖。研究结果对指导升钟水库水污染防治与水资源管理具有重要的意义。 相似文献
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以长江源区为例,概略介绍了地理信息系统在该区域的应用前景及方法。地理信息系统的应用可为水土流失动态提供丰富的信息,大大缩短数据更新的周期,对于水土流失数据处理、规划、应用建模以及大面积治理,具有实际指导意义。 相似文献
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城镇化是推动我国经济社会发展的重要动力,在高速发展的同时,带来大量污染排放,威胁乡村环境质量与可持续发展。在对乡村生态环境问题剖析的基础上,从战略、实施、方式等层面探索解决思路,围绕科学规划、发展方式、基础建设、管理机制、宣传教育等方面分析关键点,加强乡村环境保护,保障城镇化建设健康发展,为促进农村农业持续发展提供持久动力。 相似文献
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Trametes versicolor decolorized 2000 mg L(-1) of the mono-azo substituted naphthalenic dye Amaranth with no dye sorption observed visually. The changes in the toxicity were assessed over a period of 30 d for the dye-treated viable culture, control (no dye added), and a boiled culture treated with dye, using the Microtox Acute Toxicity assay. Before dye addition, the culture filtrate had some toxicity, which increased after the dye addition. The toxicity of the dye-treated culture decreased during the treatment. The loss of toxicity occurred at the same time, with the loss of color suggesting that detoxification is associated with decoloration. The change in pH was due to natural metabolic processes and had a small effect on detoxification. Because the toxicity of the treatment was similar to that of the control at the end of the treatment, the effluent seems to be safe for release into the environment, potentially rendering this treatment suitable for industrial application. 相似文献
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泵站树状给水管网流量具有随机性,而这种随机性变化会直接影响管网的建设费用和动力费用.针对这-特点,应用随机规划原理,建立泵站树状给水管网机会约束模型,编写基于随机模拟的遗传算法程序求解该模型.机会约束模型能较客观地反映该管网的实际工况,使优化设计结果更符合实际. 相似文献
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Sudipta B. Sarmah B. Das A. Garg L. Gao R. K. Pai 《International Journal of Green Energy》2020,17(8):510-520
ABSTRACT Estimation of State of Health (SoH) of Lithium-ion (Li-ion) battery is essential to predict the lifespan of batteries of an electric vehicle (EV). The efficient prediction of battery health indicates to the effective and safe operation of EV. However, delivering an effective and accurate method for the estimation of SoH in the real condition is truly a challenging task. The present study proposed a holistic procedure of combining both experimental and numerical investigations to conduct the fundamental study on coupled mechanical-electrochemical behavior of Li-ion battery. The proposed investigation highlighted the effect of stress on the capacity of the battery, considering capacity fade as an equivalent parameter to its health for real-time estimation of SoH. Finally, a simple model of Artificial Neural Network (ANN) is provided, which shows the linear dependency of stress with the SoH. The results obtained from the ANN model are validated with a Linear Regression (LR) model for a better understanding of the inspection. The predicted value of mean Square Error (MSE) and R square error in the ANN training model are found to be 0.000309 and 0.849687, respectively. Whereas for the test model, these predicted values are found to be 0.000438 and 0.819347, respectively. 相似文献
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A previous study using respondents in a London regional audience appreciation diary panel showed that links existed between overall amounts of the viewing of television recorded across one week and levels of perception of risk of three hazards to life, namely lightning, flooding and terrorist bomb attacks. With a fourth hazard, cancer, there was an inverted U-shaped relationship between perceived risk level and amount of viewing. At the same time there were no relationships between amounts of viewing of news and documentary material and perceived risks of any of 12 hazards. Two new surveys were done, nearly three years after the previous one, asking people in widely different regions about their perceptions of nine various hazards, and linking these results with measures of attitudes towards certain adaptations of new technology (which could prove hazardous or beneficial according to points of view) and to patterns of television viewing. The two surveys agreed on a wide number of points with each other; they agreed with the previous study in finding no steady relationships between information programme viewing and hazard perception. Lightning and flooding were again related, this time more specifically with viewing of particular types of television programming. A new finding is that heavier viewing of television sport is associated with less perceived risk of cancer and of nuclear pollution. Interpretations are generally favoured along the lines of a selective process of viewers with certain predispositions choosing certain kinds of viewing patterns, rather than that programme contents provide an example for formulating perceptions and attitudes. 相似文献
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开发白洋淀旅游资源的制约因素与对策 总被引:2,自引:0,他引:2
作者在实地调查研究的基础上,认为制约白洋淀旅游业发展的因素主要有水位不稳、水质受到污染、旅游项目内容贫乏、参与性差、景区文化氛围不和谐,以及管理不到位。作者提出,应努力保持其水位稳定,加强流域内污染治理,理顺管理体制,建立白洋淀湿地保护区,加大旅游资源开发和宣传力度,丰富旅游的文化内涵等来保证白洋淀旅游的可持续发展。 相似文献