引滦宜兴埠管理处工程管理软件的开发及应用

根据引滦宜兴埠处工程管理的业务流程,利用现有的计算机网络开发实现有效的、易操作的工程管理软件,既提高了工作效率,又为提升引滦宜兴埠管理处现代化管理水平提供了良好的工具平台.     

引滦工程宜兴埠管理处办公自动化系统开发应用

介绍了采用现代化的信息技术,研究和开发了天津市引滦工程宜兴埠管理处办公自动化系统,实现水利工程管理信息化.大大提高引滦工程管理水平.     

关于提高引滦明渠管理水平的几点思考

引滦明渠是引滦入津工程的重要工程设施,它是一条绿色的纽带,串联着水库、泵站、水闸等这些明珠,引滦明渠的高标准管理是建设好引滦文化生态风景一条线的基础。随着亚行明渠治理工程的完成,特别是引滦潮白河管理处、宜兴埠管理处顺利通过水利部国家一级水利工程管理单位验收,如何进一步管理好引滦明渠是摆在明渠管理者面前的一项艰巨任务。通过近几年管理者不断的研究、实践,总结出以下几个方面的措施,对于提高引滦明渠工程的管理有一定的借鉴意义。     

引滦入津工程管理信息系统分析思考及完善建议

引滦入津工程管理信息系统从正式开工建设到现在已历时近8年时间,为提升引滦工程安全供水保障率,满足应急管理工作中的技防要求,全面提升引滦现代化管理和工程管理水平作出了巨大贡献。但随着我国信息技术的飞速发展,信息系统部分功能需要进一步拓展,硬件设施需要进一步升级改造,软件应用方面也需要进一步深化。结合引滦工程管理实际,就存在问题进行分析思考,并就今后引滦信息系统升级改造提出意见建议。     

引滦枢纽工程信息化发展现状分析及建议

针对引滦枢纽工程信息化发展现状,对已开展的信息化建设工作进行了分析,并结合新形势、新任务下的水利工作,就进一步加快引滦枢纽工程信息化建设、提高引滦枢纽工程的自动化管理能力提出了引滦枢纽工程信息化发展思路、目标任务的建议。     

实行管养分离 提高引滦黎河工程管理水平

工程管理是一项确保引滦输水及防洪安全的重要工作。随着社会主义市场经济的发展,需要工程管理工作实行"管养分离",将工程养护机构和人员分离出来,实行合同管理。在实际运行中,采取积极稳妥的措施,确保"管养分离"新体制的良好运行,使工程管理水平不断提高。     

光电式编码技术在水闸设备改造中的应用

限位装置是水闸的重要组成部分和安全保障设施,其动作的准确性和可靠性直接关系到水闸的安全运行.在提高引滦工程管理水平、加强引滦信息化建设的总体目标下,对水闸设备设施进行技术改造成为必要举措.该文介绍了先进的光电式编码技术在引滦工程宜兴埠管理处闸门限位装置改造中的应用实例,以及经过改造后产生的实际效果.     

清产核资与资产管理

1前言向管理要效益，是水利工程管理单位的永恒主题。国有资产是社会主义公有制的物质基础，是财政收入的源泉。所以，必须摸清家底，核实资金，重估固定资产的总价值，以保障企业权益。引滦工程局由潘家口水利枢纽、大黑汀水利枢纽、引滦枢纽闸三部分组成，引滦工程的建成，缓     

加强工程管理构建引滦输水安全保障体系

分析了加强工程管理与建设引滦安全保障体系的关系,介绍了引滦工程输水安全保障体系的建设目标,从引滦入津工程输水安全保障体系建设目标出发,重点从水环境安全管理、工程设施设备管理、水利信息化建设、人员管理、精细化管理理念的推行和规范安全生产制度等方面分析,如何加强管理以实现引滦输水安全保障体系的建设。     

发扬引滦精神开创引滦管理新局面——纪念引滦入津工程通水一周年

在和全国各族人民,热烈欢庆伟大的中华人民共和国成立三十五周年到来之际,天津人民以无比喜悦的心情同时纪念引滦入津工程输水一周年。一年前,引滦工程的建设者,胸怀四化建设的大目标,在党中央、国务院的亲切关怀下和天津市委、市政府的正确领导下,一靠科技进步,二靠英勇拼搏的革命精神,经过一年另四个月的奋斗,创造了举世闻名的引滦工程和引滦精神,这是社会主义的物质财富和精神财富,是中国水利建设史上的一个奇迹。一年来,引滦工程的管理者继承和发扬了引滦精神,为开创第一流管理水平克服了重重     

地下厂房施工过程的三维非线性数值模拟分析

根据冗各电站地下厂房开挖支护的施工顺序,以隐式杆单元模拟锚杆,以壳单元模拟混凝土喷层,采用三维非线性有限元技术,对洞室群的开挖支护动态过程进行了模拟计算。通过三维非线性有限元计算分析得到:洞室群动态开挖过程中围岩应力变形的分布规律,围岩塑性区的发展规律,锚杆受力变化情况。计算结果表明:整个开挖过程中,洞周围岩位移变化规律正常,量值较小,塑性区主要分布在洞室周边,围岩稳定性较好;但在洞室交叉口处围岩的变形较大,出现较大范围的塑性区,在此基础上提出了支护措施优化方案,并对优化方案的效果进行了评价。     

Evaluation of freshwater mussel relocation as a conservation and management strategy

The relocation of unionacean mussels is commonly used as a conservation and management tool in large rivers and streams. Relocation has been used to recolonize areas where mussel populations have been eliminated by prior pollution events, to remove mussels from construction zones and to re-establish populations of endangered species. More recently, relocation has been used to protect native freshwater mussels from colonization by the exotic zebra mussel Dreissena polymorpha. We conducted a literature review of mussel relocations and evaluated their relative success as a conservation and management strategy. We found that 43% of all relocations were conducted because of construction projects that were forced to comply with the Endangered Species Act 1973 and that only 16% were monitored for five or more consecutive years. Most (43%) relocation projects were conducted from July to September, presumably a period when reproductive stress is relatively low for most species and the metabolic rate is sufficient for reburrowing in the substrate. The mortality of relocated mussels was unreported in 27% of projects; reported mortality varied widely among projects and species and was difficult to assess. The mean mortality of relocated mussels was 49% based on an average recovery rate of 43%. There is little guidance on the methods for relocation or for monitoring the subsequent long-term status of relocated mussels. Based on this evaluation, research is needed to develop criteria for selecting a suitable relocation site and to establish appropriate methods and guidelines for conducting relocation projects.     

基于模型试验的河床砂砾石层基本特性研究

为了经济可靠地确定深厚覆盖层的基本特性参数,以大渡河双江口水电站坝基河床砂砾石层基本特性研究为工程背景,进行大尺寸模型试验,研究河床砂砾石层的旁压模量和动探击数随密度、级配以及上覆压力的变化规律。根据室内模型试验结果,结合现场旁压试验及钻孔试验成果,推断出坝址区河床砂砾石相关层位的密度,并依此进行砂砾石室内力学试验,获得设计所需力学参数。研究成果可为深厚覆盖层基本特性测试提供新的方法。     

Serial discontinuities in a Rocky mountain river. I. Distribution and abundance of plecoptera

Samples were taken year-round at eleven sites along the altitudinal profile (2900-1400 m a.s.l.) of the Gunnison River, a 329 km tributary of the Colorado River, to document the distribution of the Plecoptera and to evaluate responses to hypolimnial-release dams in the headwaters and middle reaches. Twenty-two species were present, with the greatest species richness occurring in an unregulated segment upstream of the middle reach dams; average nymphal biomass over the study period (175 organisms, 395 mg dry mass m^?2) was also greatest in this segment. Only four species (58 organisms, 48 mg m^?2) were present in the tailwaters of the headwater dam and values were greatly reduced (nine species; 35 organisms, 180 mg m^?2) below the middle reach dams. The stonefly community recovered ca. 80 km downstream from the last dam (15 species; 244 organisms, 250 mg m^?2), apparently in response to natural resetting of environmental conditions corresponding to those above the middle reach dams. At the most downstream site (11) only four species (four organisms, 16 mg m^?2) were present. The observed distributional pattern is a classic serial discontinuity in response to hypolimnial stream regulation in a temperate latitude river.     

基于BP神经网络-马尔科夫链模型的隧道围岩位移预测

在隧道工程施工中,围岩位移预测起着很重要的作用。将BP神经网络-马尔科夫链模型引入到隧道围岩位移预测中来,通过对训练样本的学习,利用BP神经网络实现了对位移时间序列的滚动预测,同时得到了实测值与预测值的相对误差;在此基础上利用马尔科夫链对相对误差进行修正,有效地提高了预测结果的精度。并将该模型应用于某公路隧道拱顶下沉位移时序预测中,结果表明该模型具有精度高、科学可靠的特点,为隧道围岩变形的预测提供了新的途径。     

Short communication. Pipelines as a refuge for freshwater snails

In the lower River Murray, Australia, populations of gastropods have declined markedly over the past 40 years. Of the native fauna of about 18 species, only the ancylid Ferrissia petterdi remains common (but in patches), and another five species feature in sporadic local resurgences. Until recently the viviparid Notopala was thought to be extinct. The introduced physid Physa acuta is widespread, but in low numbers. The decline probably is associated with flow regulation, high turbidity and the introduction of common carp. Snail populations have persisted, however, in irrigation pipelines fed from the river, where they periodically cause blockages. This paper reports the discovery of the only known populaion of Notopala hanleyi in a pipeline where the inner wall accumulates microbial and other organic matter, providing high quality food for snails. In the Murray before regulation most of the periphytic biomass was probably microbial, as fluctuating water levels would have maintained littoral communities in a highly productive, early state of succession his postulated that, by stabilizing seasonal water levels, regulation has promoted the production of filamentous green algae, an inferior food source, and so displaced snail populations from the open aquatic environment.     

浙江省水域调查录入系统的设计和应用

浙江省水域调查录入系统将调查数据与电子地图相整合,对分类水域数据进行统计计算,并对输入数据进行合理性和完整性检查,得到调查范围内现有水域的详细数据,实现了水域调查数据输入、计算、统计和查询的数字化管理,提高了工作效率和工作质量,为各地下阶段水域保护规划编制和水域管理工作提供了数据支持。对该系统的设计原则、功能和技术设计等作了介绍。     

基于CT-连续加荷水泥乳化沥青混凝土细观损伤规律研究

利用CT技术对水泥乳化沥青混凝土的细观损伤过程进行实时扫描观测,获得了混凝土试件在连续加荷下的CT图像。通过采用直观分析法、CT数分析法、CT数与损伤变量关系3种方法分析表明,水泥乳化沥青混凝土的破坏过程可分为压密、扩容、裂纹扩展、破坏4个阶段,同时混凝土在受压过程中具有韧性,在极限荷载之前各断面处于压密和微扩容的强化阶段,极限荷载之后混凝土从损伤到破坏发展比较平稳。     

Automated system for removal and pneumatic transport of fly ash from electric precipitator hoppers

A system for removal and pneumatic transport of fly ash is examined, in which air pulses act on batches (pistons) of ash formed in a duct. Studies are made of the effect of several physical parameters on the force required to displace a piston of ash and these serve as a basis for choosing a system for removal and pneumatic transport of ash simultaneously from several hoppers of an electric precipitator. This makes it possible to separate the ash particles according to size without introducing additional components. Formulas are given for calculating the structural and dynamic parameters of this system and measurements of indirect dynamic parameters are used to calculate the input-output characteristics of the system. In order to optimize the system, configurations for summing several ducts into a single transport duct for pneumatic ash transport are proposed. Some variants of dry ash utilization and the advantages of producing of size-separated particles are considered. __________ Translated from élektricheskie Stantsii, No. 2, pp. 26–30 (2008).     

The flood pulse advantage and the restoration of river-floodplain systems

The ‘flood pulse advantage’ is the amount by which fish yield per unit mean water area is increased by a natural, predictable flood pulse. Evidence for this increase is presented from tropical and temperate fisheries. It is argued that increasing multispecies fish yield by restoring the natural hydrological regime is consistent with increasing production of other trophic levels and with restoration from ecological and aesthetic viewpoints. When applied to a river-floodplain system, this restoration would provide a large, self-sustaining potential for recreation, commercial exploitation, and flood control. An interim ‘natural flood pulse’ restoration approach is proposed for systems modified for navigation. This approach approximates the natural hydrological regime in a river reach and is intended as a first step in the long process of restoring the watershed.