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城市雨洪利用的研究现状与发展方向 总被引:6,自引:0,他引:6
城市雨洪利用是针对城市开发建设区域内的屋顶、道路、庭院、广场、绿地等不同下垫面降水所产生的径流,采取相应的集、蓄、渗、用、调等措施,以达到充分利用资源、改善生态环境、减少外排径流量、减轻区域防洪压力的目的,系寓资源利用于灾害防范之中的系统工程. 相似文献
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美丽中国,美在哪里?老外来北京,最感兴趣的是四合院、胡同;世界看中国,最敬仰的是那些民族特色村寨,婚、丧、嫁、娶、衣、食、住、行、歌舞艺术、民俗节庆……因为它们遥远、神秘、稀少、陌生…… 相似文献
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《水利水运工程学报》2012,(6):32
《水利水运工程学报》是以涉水工程等为论述主题的学术期刊,主要反映国内外在水利水电、水运、海洋工程、土木工程、水文水资源和水环境等领域中科学技术的最新成果、最新科技前沿动态、重大研究项目技术进展;报道水利水电、水运、海洋工程、土木工程、水文水资源和水环境等重大工程的规划、可行性研究、科研、设计、施工、监理以及管理工作中的新理论、新技术、新方法和新材料等。 相似文献
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2008中国水博览会的各项筹备工作已进入最后的冲刺阶段。截至目前,已有来自中国、加拿大、奥地利、法国、德国、印度、以色列、意大利、日本、俄罗斯、西班牙、瑞士、韩国和美国等国家的160多家海内外参展商报名参展。其中以色列和日本分别以强大的国家展团形式集中展示本国最先进的水工业技术和设备。 相似文献
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V. F. Kanarskii S. V. Kukhtii Yu. N. Vasil'ev E. F. Zhila A. A. Evtushok 《Power Technology and Engineering (formerly Hydrotechnical Construction)》1989,23(2):73-79
Conclusion The method examined above of predicting the reworking of banks of the LR of a PSS similar to the LR of the Dnestr PSS does not claim completeness and rigorousness of the solution and, naturally, should be refined by data of subsequent onsite observations and investigations, which will make it possible to perfect both the calculation method itself and its theoretical basis.Translated fromGidrotekhnicheskoe Stroitel'stvo, No. 2, pp. 16–21, February, 1989. 相似文献
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灌区渠道防渗的节水技术 总被引:1,自引:1,他引:0
随着水资源的短缺,提高农用水效率已迫在眉睫,而渠道防渗是当前灌区节水改造的重要内容之一,也是节水灌溉的重要途径。介绍了渠道防渗的各种措施及其优缺点,并从渠道规划设计、采用的衬砌材料不同及输水断面形式的不同三个方面加以阐述,重点提到了北方渠道的防冻涨破坏的要求,结合东北地区自然条件和社会经济条件提出了几种既适用又极易推广的渠道防渗措施。 相似文献
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介绍SIMHYD降水径流模型的结构及计算原理,利用该模型模拟了丹江口以上汉江上游流域的月流量过程,并采用区间分析方法分析SIMHYD模型参数的敏感性。结果表明:SIMHYD模型可以较好地模拟该流域的月流量过程;根据参数敏感性大小可将SIMHYD模型参数归为3类:第1类为敏感参数,如SMSC和SUB;第2类为较敏感参数,如CRAK和K;第3类为非敏感参数,如INSC,COEFF和SQ。 相似文献
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为明确浑河沈抚段水污染特征,提升水环境治理有效性,2015年3月—2016年2月对浑河沈抚段进行水环境调查。根据丰、平、枯3个水期的pH值、电导率、COD、NH_3-N、BOD及COD_(Mn)等水质指标,运用改进的综合水质标识指数法识别出主要污染因子,并分析浑河沈抚段水质污染时空变化特征。结果表明,研究区域的pH值在一个水文年变化范围为6.42~8.06,较适宜水生生物生长;水体在枯水期的电导率最高,丰水期最低。浑河沈抚段水体受沿岸工业废水和生活污水的点源污染影响,流域枯水期和平水期各监测断面的综合水质均未达标;从上游到下游4项水质指标的综合水质指数增大,污染逐渐加重,主要污染指标为COD和NH_3-N。 相似文献
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Analysis of causes of erosion-corrosion wear of the metal of internal surfaces of watered regions of tubes of heat-exchange devices 总被引:1,自引:0,他引:1
I. I. Belyakov V. I. Breus 《Power Technology and Engineering (formerly Hydrotechnical Construction)》2006,40(1):44-49
Causes of the appearance of erosion-corrosion wear (ECW) on inlet regions of tubes of heat-exchange devices are considered.
Experimental data are used for determining the mechanism of the ECW process and suggesting measures for its prevention.
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Translated from élektricheskie Stantsii, No. 11, November 2005, pp. 56–62. 相似文献
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V. V. Lgalov G. N. Tsedrov 《Power Technology and Engineering (formerly Hydrotechnical Construction)》1971,5(7):654-656
Conclusions For the first time the method use for investigating flow separators of high-head structures made it possible to recreate on
a model cavitation phenomena that occurred in the original. The studies established the main cause of destruction of the elements
of separators. The sources of cavitation that involved destruction of the concrete on the surface of the separators are: the
presence of a sharp edge at the junction of the top and side surfaces of the separator; the presence of a poorly streamlined
section at the initial part of the separator at the junction of the vertical side faces and surface of the spillway at the
entrance to the gap between the separators; the presence of construction defects on the surfaces of the separator (depressions,
pits, beds, and, especially, projections from formwork offsets). The last, as the experiments showed, are the most dangerous,
especially if their vertical face is oriented against the flow.
Rounding of the edges can eliminate the occurrence of cavitation on the side surface at the start of the separators; however,
the requirements imposed on the quality surfaces remain the same, since this does not eliminate cavitation on irregularities.
Facing of the separators and adjacent spillway surfaces with metal provides sufficient smoothness and greatly increases the
resistance of the surface to cavitation erosion. Here one can consider that the lining practically eliminates the appearance
of concealed but probable defects on the concrete surfaces during operation of the structures.
Translated from Gidrotekhnicheskoe Stroitel'stvo, No. 7, pp. 36–38, July, 1971. 相似文献
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糯扎渡水电站泄洪洞工作弧门有动水启闭和局部开启运行要求,闸门设常规和冲压水封(全关工况冲压水封止水)。监理工程师对闸门安装前的准备工作进行了逐一检查,分析了影响闸门整体安装质量的关键工序,确定了支铰大梁和支铰安装是弧形闸门安装的质量关键点;左右固定支铰轴孔的同心度、钢梁的倾斜度、左右支铰到孔口中心线距离、支铰轴孔中心连线到底水中心线的距离、二期混凝土浇筑导致的变形是安装质量控制重点。闸门安装完成后,经过调试和试运行,安装质量达到了较高水平。对整个安装过程作了详细介绍,可为同类工程参考。 相似文献