松花江洪水管理系统备份解决方案

随着信息技术的不断发展,近年来在世界范围内掀起了兴建网络环境、传播教据信息的热潮.随着计算机存储信息量的不断增长,数据备份和灾难恢复就成为一个急待解决的问题,文章从系统数据备份需求、备份的制定等方面,论述了松花江洪水管理系统备份方案.     

水利电子政务系统数据库应急恢复方法研究

对于任何一个系统，数据的安全性是保证系统正常运行的重要因素。结合实际工作需要，对水利电子政务系统数据库应急恢复方法进行研究，分析数据备份的重要性和恢复测试的必要性，比较了物理和逻辑备份恢复方法的优缺点，通过具体实例，对Oracle数据库的备份和恢复的方法进行归纳总结，希望对双机集群数据库的备份和灾难恢复有一定参考价值。     

数据备份系统在水利网中的应用

随着大数据和云计算技术的不断发展,业务数据的容量也呈现出爆发式的增长,水利网络中大量的应用数据和数据库信息一旦出现丢失和误操作都会影响整个信息系统的正常运转。传统的备份手段对人工依赖强,因此运用新的数据备份恢复系统就显得越来越迫切。运用备份恢复一体机对现有水利系统关键数据实时同步和定时备份,保障了系统安全稳定运行。     

长江委政务内网备份系统解决方案之构想

长江水利委员会政务内网已部署完成,相关应用系统也已在内网投入运行,长江委委机关用户都已接入内网办公,对系统运行的稳定性和可靠性提出了新的要求。随着系统应用的逐步展开,系统中存储的数据量也会相应增加,必须采用专业的数据备份解决方案,同时提供良好的扩展支持能力,防止数据的丢失,以及保证故障的恢复能力。经过不同方案的比选,最终采用SAN架构解决方案,可集中地解决业务系统体系结构中对存储备份的要求,同时采用灵活、实用的备份策略对备份任务进行有效的管理。对方案架构设计、实施要点和保障措施与方法进行了介绍,并对实施效果作了总结评价。     

长江委政务外网数据中心灾备建设技术实践

数据的备份和容灾是数据保护的重要技术。针对长江水利委员会数据中心的现状,参考备份系统的建设原则和灾难恢复的分级体系,制定长江水利委员会数据中心灾备体系的建设,从备份组网的设计、备份策略的制定、灾难恢复等多方面建设长江水利委员会数据中心灾备系统。随着工作要求不断提高,为保证长江水利委员会政务信息化以及业务连续体系的建设,对建设异地容灾中心展开探讨与研究:提出利用通信网络将关键数据定时、批量传送至备用场地,提供异地数据备份和容灾,以"两地三中心"的模式为长江水利委员会核心系统的业务和数据提供最高级别的保障。     

集中式数据备份在三防指挥系统的设计与实现

数据备份是信息化项目建设的一个关键环节,如何解决业务应用系统与数据备份之间的资源争夺是一直存在的技术难题.该文通过对广东省三防指挥系统备份系统的分析,给出了一个备份系统的成功案例,对目前其它的水利信息化设计和建设有一定的借鉴作用.     

基于构件技术的能量管理系统设计思想

能量管理系统（EMS）的软件质量和生产效率的提高依赖于软件复用的深度和广度。 文中面向EMS这个特定领域，基于构件技术，提出了一种EMS的层次模型。在对电力系统EMS 的服务需求进行分析的基础上，从逻辑上将系统分为用户界面部分和数据处理部分。从构件技术的思想出发，将EMS分为数据采集、能量管理和网络分析3个层次。所提出的EMS的构件 化层次模型，基于逻辑进行C/S功能的划分、基于功能对象进行构件的划分，有利于实现相应的软件复用。     

广东省水利厅计算机网络系统的数据存储备份策略

通过分析数据备份存储的重要性及当前的主要技术等，介绍广东省水利厅计算机网络系统的数据库存储备份的现状和发展策略。     

基于Orack Data Guard的数据灾备系统设计和实现

数据远程实时备份是应对各种数据灾难的一种行之有效的方法。本文通过对数据备份关键技术进行分析、比较和研究，提出对水利系统重要业务应用系统采用Oracle Data Guard进行数据远程备份的方法，并对原有技术存在的缺陷进行了改进。     

水文数据备份方案探讨

目前，水文部门已经普遍使用计算机进行资料收集、整理，大量的实时资料入库保存，基于数据库的水情信息发送，洪水预报，水文计算等应用程序的运行，对水文数据的安全提出了很高的要求，本文对常用的水文数据备份方法进行了比较与探讨，针对水文部门的工作性质，提出了以ARCServeIT为基础的软件备份方案。     

Call for Papers

正As the eldest and most distributed professional journal of water industry,Water Wastewater Engineering(W WE)gained very wide acceptance from the colleagues working in this field in this country since start publication in 1964.Now it is administrated by the Ministry of Construction of the People’s Republic of China and sponsored by the China Civil Engineering Society etc.     

库水波动下库岸边坡地下水浸润线解析解及误差分析

解析法是库岸边坡地下水浸润线计算中便于实际应用的方法,但该方法须基于若干假定并对潜水运动基本方程线性化后才能求解。针对各假定和线性化过程建立不同的地下水渗流数学模型,用解析法和有限元法解答上述数学模型,分析各误差大小及其规律。结果表明：库岸垂直处理带来的误差要小于方程线性化处理和不考虑非饱和渗流带来的误差,而且它们都随渗透系数变大而减小;在三峡库区库水调度情况下,假定库水位等速变化带来的误差对大多岸坡而言可以忽略;计算库岸边坡地下水浸润线时,解析法只适用于水位变化幅度相比含水层厚度较小,且几何边界规则、岩土结构简单、岩土体渗透性较好时的情况。     

Changes in Summer Irrigated Crop Area and Water Use in Southeastern Turkey from 1993 to 2002: Implications for Current and Future Water Resources

Changes in summer irrigated cropland acreage and related water use are estimated from satellite remote sensing and ancillary data in semi-arid Southeastern Turkey where traditionally dry agricultural lands are being rapidly transformed into irrigated fields with the help of water from the Euphrates-Tigris Rivers. An image classification methodology based on thresholding of Landsat NDVI images from the peak summer period reveals that the total area of summer irrigated crops has increased three-fold (from 35,000 ha to over 100,000) in the Harran Plain between 1993 and 2002. Coupled analysis of annual irrigated crop area from remote sensing and potential evapotranspiration based estimates of irrigation water requirements for cotton indicate a corresponding increase in agricultural water use from about 370 million cubic meters to over one billion cubic meters, a volume in accordance with the state estimates. These estimates have important implications for understanding the rapid changes in current agricultural withdrawals in Southeastern Turkey and form a quantitative basis for exploring the changes in future water demands in the region. For example, expansion of irrigated lands have led to a steady decrease in potential evaporation due to increased roughness and decreased humidity deficit in the Harran Plain. Assuming that the changes in future evaporation conditions will be of similar nature, water use for irrigation is expected to decrease over 40 percent in future irrigation sites. Incorporating this decrease in overall planning of the irrigation projects currently under construction should lead to improved management, and by extension, sustainability of water resources in the region.     

浅谈优化Vray渲染在制作三维场景的应用研究

用Vray三维渲染引擎来渲染三维场景,其质量和速度是由一些影响因素和参数设置决定的,不同的参数和因素,可以得出不同的三维渲染效果.因此,分析、优化三维渲染质量和速度的影响因素,正确、合理的选择参数对提高Vray最后渲染阶段的质量和速度非常重要.     

固结、渗流和沉积控制方程研究

本文从两相流体动力学的守恒方程出发，考虑固相、液相的相对运动，推导了可以考虑场的不均匀性和流体压缩性的统一形式的控制方程，并对方程所基于的物理概念和相互联系进行了必要的分析。通过对方程适当形式的表达，可导出用于大、小变形固结、渗流和沉积的简化方程，显示了在不同领域的三个理论存在一定的统一性。方程推导过程并未对本构关系加以限制，适用范围较广。依据实际问题的要求，作了不同形式的简化。     

四川省及重庆市中型水电站效益分析

该文分析了四川省及重庆市几座中型水电站的调查材料表明：四川省及重庆市中型水电站不仅在川渝主网和地方电网中起着很大的作用，并具有巨大的社会效益，同时还有综合利用效益，说明修建中型水电站的优越性．     

Site modelling methods for detecting hydrologic alteration of flood frequency and flood duration in the floodplain below the carlyle dam,lower Kaskaskia River,Illinois, USA

Reports concerning the influence of dams on river hydrology vary among researchers, interest groups and government agencies. These often contradicting statements may occur because changes in hydrology caused by dams are distinct for each dam and river watershed. The objective of this research was to use site specific techniques to determine if the 1967 installation of the Carlyle Dam, lower Kaskaskia River, Illinois, altered flood frequency and duration within the forested floodplain located below the dam. Results indicated a decrease in flood duration and frequency, and a decrease in annual flood frequency variation at a site 6.4 km below the dam. Pre‐dam versus post‐dam differences in flood frequency and duration at the site 32.2 km below the dam were related to climate rather than dam effects. Although dam impacts are a concern, this research shows that distance downstream from the dam and downstream tributary and watershed characteristics should be considered before assuming that the dam has changed hydrologic parameters for portions of rivers. This research also indicates that areas of the lower Kaskaskia River may still maintain hydrologic ecological integrity, and could be targeted for restoration and adaptive management purposes. Hydrologic modelling combined with river gage and on‐site well measurement techniques presented in this study could provide detailed flood frequency and duration information for land use, sociological and geomorphological questions in focus areas within river floodplains. Copyright © 2008 John Wiley & Sons, Ltd.     

Statistical tools for thermal regime characterization at segment river scale: Case study of the Ste‐Marguerite River

Suitable thermal fish habitats are constrained by both maximum and minimum temperature tolerances. A multivariate and geostatistical approach was developed to estimate stream thermal characteristics at the river segment scale. Data from 22 temperature‐monitoring stations during summer 2007 were used to estimate monthly maximum temperature as well as thermal characteristics such as the number of events, the cumulative degree–days and the associated duration over specific temperature thresholds of 19 and 21°C. The probability of exceeding these temperature thresholds has also been interpolated. The methodology relies on the construction of a multivariate space using physiographic and hydrological characteristics of gauging stations as inputs in a canonical correlation analysis (CCA). A geostatistical interpolation technique, ordinary kriging, was subsequently used to perform interpolation in the physiographical space constructed using CCA. Results from this study were obtained for thermal characteristics estimated into two different interpolation spaces: (1) a 7 metrics space, and (2) an 8 metrics space. Cross‐validation technique has been performed and satisfactory results were obtained. Kriging thermal characteristics (magnitude and duration) into the 7 metric space for a 19°C threshold exceedance leads to best results with Relative Root Mean Square Error (RRMSE) ranging between 9.66 and 15.08%. The study shows that kriging in a multivariate space is a promising tool for water resources managers, especially in cases where risk mapping for lethal or sub‐lethal temperature thresholds may be required for a specific fish species. Copyright © 2010 John Wiley & Sons, Ltd.     

掺MgO混凝土的宏细观试验研究

利用MgO膨胀剂的延迟微膨胀效应能显著提高大体积混凝土的力学性能,产生的预压应力还能有效提高大体积混凝土抵抗温度开裂的能力,但目前对其微观机理研究不多。采用宏观与微观相结合的方式,研究了不同活性指数、不同掺量的MgO混凝土的力学性能,利用SEM/EDS微观分析手段揭示了MgO对混凝土性能影响的作用机理。试验结果表明：MgO取代部分水泥掺入混凝土中,混凝土的力学性能降低;掺量为4%~5%时,活性指数为100s的MgO混凝土的膨胀率大于活性指数为50 s的MgO混凝土;MgO混凝土的膨胀特性与Ca,Si,Mg,Al等元素的分布情况有关,掺入的MgO将改变界面区Ca,Si,Mg元素的富集特性,Ca元素和Mg元素更易于在界面区富集,导致混凝土宏观力学性能的降低。     

基于MIDAS软件探讨施工工序对深基坑稳定性的影响

基于武汉地铁名都站深基坑工程与水文地质勘察资料,建立了三维工程地质仿真计算模型。依据名都站深基坑开挖支护方案,利用有限元软件MIDAS的摩尔-库仑本构模型,对武汉地铁名都站深基坑施工过程中,不同施工工序下每步开挖之后,基坑的变形情况做仿真模拟计算,并对比分析其对基坑稳定性的影响。结果表明：基坑围护结构的变形情况与施工工序有很大的关系,施工工序越合理,上部土体变形越小,反之越大。因此,在基坑工程的施工过程中,要注重施工步骤的划分与合理安排,从而保证基坑工程的安全。研究成果为以后武汉地区基坑工程的施工设计提供了值得借鉴的经验。