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三峡库区开县消落区水环境治理水位调节坝设计 总被引:4,自引:0,他引:4
三峡库区开县水域消落深度大,水位消落期将出现大面积裸露区,严重影响开县新县城及周边生态环境。因此,研究决定采用建设水位调节坝与前置库库周生态建设工程相结合的工程治理措施,以改善开县县城周边的环境。介绍了水位调节坝工程任务与环境影响、总体布置、运行控制措施、大流量泄水闸和鱼道工程设计,以及前置库周边沿岸生态防护林、湿地及多塘系统、敞水区动植物保护措施等生态治理工程建设。工程完工后,开县新县城周边消落区面积得以大幅度减少,并形成优美的人工平湖生态城市景观。 相似文献
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文章借鉴国内外的研究成果,以开发出技术可行、经济高效的垃圾渗滤液处理工艺为目标,采用Fenton-混凝-吸附柱联合工艺对渗滤液进行了处理研究。初步探讨了Fenton-混凝-吸附柱联合工艺对渗滤液中的COD和氨氮的去除效果,同时对煤渣再利用的可行性也做了初步摸索。通过实验研究,分析了pH值、投加H2O2/Fe2+、聚合铁投加量等对处理效果的影响,得出COD、氨氮最高去除率对应的反应条件。研究发现Fenton-混凝-吸附柱联合工艺对垃圾渗滤液中污染物的去除效果较好,COD和氨氮的去除率分别可高达80.5%、72.15%,且运行成本低,具有一定的经济可行性。 相似文献
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Hui-Hai Liu Jonny Rutqvist James G. Berryman 《International Journal of Rock Mechanics and Mining Sciences》2009,46(2):289-296
Modeling the mechanical deformations of porous and fractured rocks requires a stress–strain relationship. Experience with inherently heterogeneous earth materials suggests that different varieties of Hooke's law should be applied within regions of the rock having significantly different stress–strain behavior. We apply this idea by dividing a rock body conceptually into two distinct parts. The natural strain (volume change divided by rock volume at the current stress state), rather than the engineering strain (volume change divided by the unstressed rock volume), should be used in Hooke's law for accurate modeling of the elastic deformation of that part of the pore volume subject to a relatively large degree of relative deformation (i.e., cracks or fractures). This approach permits the derivation of constitutive relations between stress and a variety of mechanical and/or hydraulic rock properties. We show that the theoretical predictions of this method are generally consistent with empirical expressions (from field data) and also laboratory rock experimental data. 相似文献
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《International Communications in Heat and Mass Transfer》2001,28(1):97-106
This paper studies the effects of the heat dissipation capacity of a rubbing material on wear resistance at high temperatures with a special focus on the dilation of the thermal energy. The results suggest a connection between the transition in wear and the change in the heat dissipatation capacity of the rubbing material. Examination of the wear data suggests that a critical ratio between the effects of the conductivity and those of the effusivity has to be established for favorable wear resistance at elevated temperatures. 相似文献
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《Synthetic Metals》2001,125(3):423-427
Polyaniline–maleic acid (PANI–MAc) salts have been prepared at various maleic acid concentrations. The salts are characterized by using infrared (IR), UV/VIS Spectroscopy, thermogravimetric analysis and conductivity measurements. Blends of PANI–MAc were made with styrene–butyl acrylate (ST–BuA) copolymer and percolation threshold determined. 相似文献
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