共查询到19条相似文献,搜索用时 177 毫秒
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大型灌区属农村基础设施,续建配套与节水改造建设是水利部四件水利大事之一,更是我省水利工作的重点之一。 相似文献
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1998年以来,湖南省按照水利部的部署,以节水为中心,狠抓大型灌区的续建配套与节水改造,狠抓大型灌区管理体制改革、运行机制改革和水价改革,取得了良好的成效。文章对10年来湖南省大型灌区的续建配套与节水改造的做法、经验和成效进行了全面、系统的分析总结,为大型灌区续建配套与节水改造后续项目的建设提供了有益的经验。 相似文献
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国家发展改革委员会和水利部目前重新修订并印发的 《大中型灌区续建配套节水改造项目建设管理办法》,为提高粮食综合生产能力,促进现代农业发展奠定了更加坚实的水利基础.内蒙古黄河南岸灌区通过近些年持续的续建配套与节水改造项目的实施,使灌区的节水效果显著提升,经济效益增长迅速,续建配套与改造技术趋于成熟化,渠道防渗效果明显,灌区信息化建设不断加强,工况条件良好、 输配水能力和用水效率大幅度提高,防洪压力减轻,灌区生态环境得到改善,灌区建设、 管理与体制改革不断创新.进而逐步探索出一条适合于内蒙古大中型灌区建设与管理的新思路,为相关部门进行大型灌区续建配套与节水改造工程提供借鉴. 相似文献
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1997年以来,我们紧紧抓住国家重视水利的大好机遇,按照水利部“两改一提高”的工作要求,大力实施节水改造和续建配套,努力实现灌区工程的可持续利用;同时,不断探索具有灌区特色的管理体制、运行机制,努力实现灌区管理由粗放型向集约经营型转变。灌区2001年被水利部列为全国灌区改革试点之一。 一、大力实施节水改造和续建配套,努力实现基础设施的持续利用 1.抢抓机遇,争取国家资金扶持 长期以来灌区由于投入不足,工程老化失修严重,只能维持低标准运行。90年代中后期,我们抓住国家重视水利的大好机遇,在省委、省政府、水利部、省水 相似文献
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吉林省多年来重点加强农村饮水、病险水库除险加固、大型灌区续建配套和节水改造、农村水电开发等与人民群众利益相关的水利上程建设,不断建立健全“民生水利”管理模式和机制,民生水利社会化服务体系逐渐完善。 相似文献
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大型灌区续建配套与节水改造项目的科学管理 总被引:1,自引:0,他引:1
大型灌区续建配套与节水改造项目从投资规模、建设范围以及社会影响等方面看都是一个比较大的项目,在我国农村水利发展历史上更是前所未有的,项目管理关系到巨大投资的效益能否正常发挥,因此有必要认真总结经验,不断提高科学管理水平.通过对大型灌区续建配套与节水改造项目的评估,总结了项目管理的经验、成效以及不足之处,进而提出了提高项目管理科学水平的建议. 相似文献
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<正>1月12日,水利部副部长鄂竟平率部农村水利工作调研组赴山西调研,深入了解山西省水利系统千名干部下基层活动开展情况以及饮水安全工程建设、大型灌区续建配套与节水改造、农田水利基本建设等农田水利重点工作进展情况,并就相关工作展开座谈。山西省副省长刘维佳陪同调研并出席座谈会。 相似文献
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The characteristics of the longitudinal vortex induced by trapezoid-winglets in a circular tube are investigated by the Particle Image Velocimetry (PIV) Technique with flow Reynolds number in the range of 500-13 000. In the experimental test section, four trapezoid-winglets are fixed symmetrically on the tube wall in two different ways: up-flow and down-flow. The results show that a counter-rotating vortex pair is formed behind each winglet and they distribute as a symmetrical vortex array in the transverse section. Between the two vortexes in a vortex pair the fluid flows towards the wall in the up-flow winglet case and away from the wall in the down-flow winglet case, corresponding also to the regions of peak values of the velocity components normal to the mainstream. Both of the flow patterns enhance the velocity in the near wall region, leading to the intensification of the transverse mixing and the mass transfer in the tube. With Reynolds number increasing, the flow maintains the vortex pattern in the case of the up-flow winglets, indicating better persistence of the longitudinal vortex, while the vortexes in the case of the down-flow winglets are more scattered and tend to breaking into small eddies. The trapezoid winglet shows the preferable turbulent disturbance characteristics in the tube and the experimental results provide benchmark data for further CFD studies. 相似文献
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V. F. Korchevskii M. Kh. Muratova 《Power Technology and Engineering (formerly Hydrotechnical Construction)》1991,25(3):107-113
Translated from Gidrotekhnicheskoe Stroitel'stvo, No. 3, pp. 6–11, March, 1991. 相似文献
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The species composition of riparian vegetation is determined by a variety of processes, including the dispersal of seeds. The seed types that end up at certain locations are determined by their particular characteristics as well as the prevailing hydrology and the physical characteristics of the river channel. A conceptual model is proposed to identify the hydraulic processes involved in the hydrochory pathway that may lead to differential response of different seed types and hence their sorting. The results of a series of laboratory experiments are presented to demonstrate the sorting between seed types by these processes. The behaviour of non‐buoyant seeds during settling and entrainment is shown to be consistent with that of mineral sediments, and their sorting can therefore be described by existing sediment transport theory. Significant sorting of buoyant seed types takes place during transport under the influence of wind and during ingress into marginal emergent vegetation, trapping by vegetation and stranding during receding flows on sloping channel banks. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
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1采用分期分块填筑混凝土面板堆石坝之所以倍受人们的关注、发展得如此迅速,除投资省、可以就地取材外,其高强度的填筑、施工工期较短、分期填筑的灵活性、施工设备可以充分利用、施工不受气候条件限制等优点,也是混凝土面板堆石坝得以高速发展的重要原因。特别是可分... 相似文献
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樟树林冠截留模拟试验研究 总被引:1,自引:0,他引:1
林冠截留是水文循环中的重要成分之一。为探究降雨特征和林分特征对樟树林冠截留效应的影响,针对降雨量、降雨强度、叶面积指数(LAI)和树龄这些相关影响因子,采用室内模拟的方法进行对比截留试验。试验得到4种样树的16组降雨量、降雨强度和截留量,以及其各自的LAI值。分析结果表明:①降雨量、降雨强度和LAI是截留的主要影响因子,树龄对截留的影响效果不明显;②雨强与截留量呈反比关系,截留量与降雨量呈二次函数关系,叶面积指数(LAI)与截留量呈正比关系;③树叶伸展方向对截留产生较大影响,模拟试验方法仍需进一步改进和完善。 相似文献
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Ding Z Golan-Goldhirsh A Rafiq MK Li T Zhao F Yang X 《Water science and technology》2012,66(10):2138-2145
The present study was carried out to investigate the growth characteristics of different ryegrass (Lolium perenne L.) cultivars and their ability to remediate eutrophic water using floating plant-bed technology. Greenhouse and lake experiments were conducted to evaluate the grass genotypes for water remediation. Twelve cultivars of ryegrass including Grazer, Secale Cerale, Energa, Rustmaster, AngusI, Abundant, AngusII, Jivet, Gulf, Surrey, Major and Barwoltra were grown in the floating plant-bed system. The plant biomass, plant NP (nitrogen and phosphorus) accumulations and the water purification capacity of selected grasses were significantly different (P < 0.05). Abundant, AngusII and Major showed most efficient purification capacity of eutrophic water. In a greenhouse, after 26 days of growth, the eutrophic water was purified to various extents by the different ryegrass cultivars. Nitrogen removal efficiency varied from 52.20% to 73.82% and phosphorus removal efficiency ranged from 75.12% to 84.77%. In a lake experiment at Huajiachi pond, after 162 days of growth, the plant shoot biomass increased from 321.5 to 922.8 g/m(2) dry weight basis, shoot NP accumulation ranged from 61.5 to 168.2 mg m(-2) d(-1) and 11.9 to 47.2 mg m(-2) d(-1) respectively. NP accumulation rate by the various cultivars of ryegrass was highly positively correlated to their biomass production and water purification capacity. Thus, plant biomass could be used as an indicator for assessing purification capacity of a ryegrass cultivar. 相似文献
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用现行的防洪标准复核,我国50~70年代修筑的数以万计的土坝的防洪标准偏低.利用碾压混凝土良好的防冲和防裂的性能,在坝顶和下游坡浇筑适当厚度的碾压混凝土保护层,遭遇超标洪水时土坝可以漫顶排泄超标准的部分洪水.用碾压混凝土改造土坝,在技术和施工方面是可行的.其既可保护大坝安全,又能防止动物和白蚁对土坝的破坏. 相似文献