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目前病险水库的除险加固设计只偏重于工程治理措施,倾向于水库大坝工程的安全,未考虑除险加固设计方案对下游居民安全、社会经济、城镇交通等的风险以及对自然环境的影响。因此,基于风险分析的除险加固优化技术对于今后病险水库除险加固方案是有效和必要的。本文参考国外病险水库大坝安全和除险加固风险分析理论的最新进展,结合我国病险水库大坝和除险加固技术的特点,进行了除险加固方案与大坝风险关联分析与决策、除险加固方案评价指标分析和基于风险分析的除险加固方案优化技术的研究,提出了基于风险的病险水库除险加固方案的评价、分析和优化方法,为今后病险水库除险加固工作提供技术支撑。 相似文献
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通过分析塔庙水库自然概况及水文情况,对水库除险加固方案进行了探讨,提出了大坝整修、溢洪道衬砌加固和放水建筑物加固设计方案,以保证塔庙水库除险加固工作顺利进行。 相似文献
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恒山水库加固方案比较 总被引:1,自引:0,他引:1
通过对恒山水库的工程概况及目前存在的问题进行论述,提出了关于恒山水库的三种加固方案,并分别从应力及荷载方面对三种加固方案进行分析比较,最终确定采用方案二对水库进行加固处理。 相似文献
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2008年5月12日四川省汶川县发生里氏8.0级强地震,四川及其周边很多的水库大坝均发生了不同程度地震损.本文以四川柏林水库为例,介绍了柏林水库在地震后出现的震损情况,并详细分析了该水库可采用的抗震加固措施,以及各加固方案的优缺点,最终综合考虑选择了适合柏林水库的加固方案.本文对地震后大坝的震损加固方案选择、加固方法等做了详细的分析,可为类似工程提供参考. 相似文献
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高阳湾水库除险加固方案探析 总被引:2,自引:0,他引:2
通过分析高阳湾水库病险情况,针对性地提出了大坝加固培厚、改造放水泄洪设施、溢洪道改建等合理化除险加固方案,并对方案的可行性进行了探讨,以确保水库通过除险加固后,能正常发挥效益。 相似文献
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本文针对小型水库的现状,分析了其除险加固的重要性和必要性,并简要概括了小型水库除险加固设计中常见的几种除险加固技术,进而提出了工程处理措施,提供了一些针对小型水库除险加固项目的参考方案,希望为未来的水库加固工程提供指导。 相似文献
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对嘉兴地区主要给水厂近年来应用立体弹性填料、LT型悬浮球填料、YS型悬浮填料、卵石填料等的生物预处理工艺从填料及配套设施、工艺运行参数、运行效果、成本等方面进行了比较.认为弹性填料生物预处理更适用于低浊(50 NTU以下)、低氨氮(1.5 mg/L以下)原水,LT型悬浮球填料生物预处理适用于低中浊(100 NTU以下)、低中氨氮(2.5 mg/L以下)原水,YS型悬浮填料生物预处理及"SAF"滤池对低浊、中高氨氮(2.5 mg/L以上)原水有较好的适应性.最后探讨了弹性填料存在的短流、积泥,悬浮填料存在的部分填料流化不均匀,富氧的生物工艺单元内水生动物泛滥等问题. 相似文献
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Changes in nutrient levels in some Eastern European rivers in response to large-scale changes in agriculture. 总被引:3,自引:0,他引:3
P St?lnacke S M Vandsemb A Vassiljev A Grimvall G Jolankai 《Water science and technology》2004,49(3):29-36
Since the late 1980s, the use of commercial fertilisers in most Eastern European countries has decreased at an unprecedented rate. We examined the impact of this dramatic reduction in agricultural inputs on concentrations of nutrients in four rivers in Eastern Europe: the Emajogi and Ohnejogi (Estonia), the Daugava (Latvia), and the Tisza (Hungary). Time series of nitrate (NO3-N) and phosphate (PO4-P) concentrations and data on runoff were selected to represent catchments with substantial areas of agricultural land and available time series of sufficient length and frequency. The study period was 1987-1998. We detected downward trends in nitrate-N and phosphate-P in only two of the four rivers. Our results imply that the response to the extensive decrease in agricultural intensity since the late 1980s has been slow and limited in many rivers. Corresponding results in the literature are inconclusive and comprise several examples of both decreasing and non-decreasing nutrient concentrations. Our findings, along with similar data from other studies, indicate that large cuts in nutrient inputs do not necessarily induce an immediate response, particularly in medium-sized and large catchment areas. Moreover, the difference we noted between nitrogen and phosphorus suggests that factors other than reduced fertiliser application influenced the inertia of the water quality response. 相似文献
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深圳河支流新洲河属雨源型河流,因污染而采取全线截排污水整治.在上游河道内利用生物飘带技术处理低浓度污水,处理达标后,作为河流生态水源.在中游将截排污水引入自然循环方式污水处理系统,处理达标后作为河道补水.下游利用射流清淤配合利用天文大潮进行水体交换,达到消除黑臭水体,维持河道水景观的目的.介绍新洲河水环境综合整治采用的几项关键技术的设计原理及应用效果. 相似文献
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对长江、珠江等河口及其近海水域缺氧现象与影响因素进行研究,结果表明,主要分布于长江与珠江河口及其邻近海域的缺氧现象,夏季(6—8月)达到最盛,秋冬季消失;长江口的缺氧区域主要位于30.75°N~32°N,122.5°E~123.25°E附近海域,具有南北2个缺氧中心;珠江口缺氧程度相对较轻,缺氧区域主要在广州黄埔区河段至虎门水域和伶仃洋;辽河、钱塘江、海河等河口区域也时而出现零星的缺氧现象;水体缺氧受控于多项环境要素,物理层化作用是缺氧产生的最初诱因之一,陆源污染物的分解则是重要的耗氧负荷;各河口区特征各异,潮汐、洋流、营养盐、叶绿素a等要素对缺氧区的范围、程度和持续时间影响程度不一。 相似文献
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Ecological river engineering can be defined as the design and implementation of river works and river restoration works for the benefit of human society. It also guarantees the sustainable ecological functions of a river, such as its habitats and self-purification of its water. It is currently in the beginning stages in Korea, utilizing scientific knowledge on the processes of aquatic ecosystem degeneration and a methodology for solving the ecological problems in artificially altered rivers currently under development. The changes in river management and work practices in Korea may be best explained with a chronologically progressing sequence of ‘Natural’, ‘Disaster-prevention’, ‘Occupied’, ‘Park’, and ‘Close-to-nature’ rivers. Since the 1960s, the focus on river management and work has shifted from flood control only, to both flood control and riverine habitat conservation and restoration. Five research topics have been selected for this article, and the progress of each research area is briefly described with a representative picture in each topic. They are as follows: (1) flow resistance due to vegetation, (2) environmental flow, (3) floodplain vegetation modeling, (4) small dam removal, and (5) river restoration. For the future prospects of research on ecological river engineering in Korea, a necessity of further research on floodplain vegetation recruitment and succession, which can explain the so-called ‘white river’ and ‘green river’, is underlined, among others. Finally, two ongoing large research programs on river ecosystem restoration, of which are sponsored by the Government of Korea, are briefly introduced, followed by the introduction of a near-prototype experiment facility recently completed mainly for research on ecological river engineering. 相似文献
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李广杰 《水科学与工程技术》2001,(5):7-8
洋河水库是我省重点病险库之一,1998年12月实施除险加固工程。工程建设过程中在科研、设计、施工及管理等方面取得了可喜的成果。通过研究分析,因地制宜地选择了天然建筑材料,合理确定了施工方案,有效保证了施工质量,节约了工程投资。 相似文献