检索结果-南通市图书馆

水电能源科学 2010年第3期28卷 57-59,65页

作者：吴波孟毅河海大学水文水资源与水利工程科学国家重点实验室江苏南京210098 河海大学水资源高效利用与工程安全国家工程研究中心江苏南京210098 河海大学水文水资源学院江苏南京210098

针对影响大坝水平位移分析的众多因素相关性较高,且传统的回归方法对数据的处理难于获得令人满意的精度,采用基因表达式编程法分析了大坝水平位移。与传统的模型预测结果相比,基因表达式编程的预测精度更高,为大坝水平位移分析提供了一... 详细信息

针对影响大坝水平位移分析的众多因素相关性较高,且传统的回归方法对数据的处理难于获得令人满意的精度,采用基因表达式编程法分析了大坝水平位移。与传统的模型预测结果相比,基因表达式编程的预测精度更高,为大坝水平位移分析提供了一种新的方法。

关键词：基因表达式编程大坝安全监控水平位移数据处理函数挖掘

A RIVER FLOW ROUTING MODEL BASED ON DIGITAL DRAINAGE NETWORK

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2005年第4期17卷 483-488页

作者： YUAN Fei REN Li-liang YU Zhong-bo XU Jing State Key Laboratory of hydrology-water resources and Hydraulic Engineering Hohai University Nanjing 210098 China

On the basis of Digital Elevation Model （DEM） data, watershed delineation and spatial topological relationship were proposed by the Digital Elevation Drainage Network Model （DEDNM） for the area upstream of the Hanzhong Hydrological Station in the Hanjiang River in china. Then, the Muskingum-Cunge method considering lateral flow into the river was applied to flood routing on the platform of digital basin derived from DEDNM. Because of considering lateral flow into the river, the Muskingum-Cunge method performs better than the Muskingum method in terms of the Nash-Sutcliffe model efficiency coefficient and the relative error of flood discharge peak value. With a routing-after-superposition algorithm, the Muskingum-Cunge method performs better than the Muskingum method in terms of the Nash-Sutcliffe model efficiency coefficient and the relative error of flood discharge peak value. As a result, the digital basin coupled with the Muskingum-Cunge method provides a better platform for water resources management and flood control.

关键词： Digital Elevation Model(DEM) digital basin drainage network flood river flow routing

Comparative study on CO_2 corrosion behavior of N80,P110,X52 and 13Cr pipe lines in simulated stratum water

在线全文

学校读者我要写书评

暂无评论

Science china(Technological Sciences) 2010年第9期53卷 2342-2349页

作者： CAI YiDong1,GUO PengChao1,LIU DaMeng1,CHEN ShiYu2 & LIU JunLai3 1 school of Energy resources,china university of Geosciences,Beijing 100083,china 2 school of Materials Science and Engineering,university of Science and Technology Beijing,Beijing 100083,china 3 school of Earth Sciences and resources,china university of Geosciences,Beijing 100083,china 1. school of Energy resources China University of Geosciences Beijing 100083 China2. School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China3. School of Earth Sciences and Resources China University of Geosciences Beijing 100083 China

To better understand the carbon dioxide (CO2) corrosion behavior of carbon steel and its influence on petroleum development (including drilling,production and transportation) in the Daqing Oilfield,CO2 corrosion behaviors of N80,P110,X52 and 13Cr pipe lines in simulated solution at high temperature and high pressure condition are investigated by dynamic corrosion experiments,scanning electron microscope (SEM) and energy dispersive X-ray spectroscopy (EDS) *** show that the corrosion rate of all pipe lines increases quickly when CO2 partial pressure increases from 0.5 to 1.5 MPa,but it slows down when CO2 partial pressure further increases from 1.5 to 4.5 MPa,during which localized corrosion is *** the experimental temperature ranges from 60 to 120°C,localized corrosion *** corrosion rate of all pipe lines decreases sharply when the temperature changes from 60 to 100°C,and it becomes stable after the temperature is higher than 100°*** the flow rate is in the range of 0–1.5 m/s,the corrosion rate of sample X52 remains unchanged,but localized corrosion gradually becomes very serious when the flow rate further *** analyzing the corrosion product scales of sample 13Cr,some remarkable phenomena are *** the temperature range of 60–100°C,the corrosion product scales are loose and thick,but become very compact when the temperature increases above 100°*** the later case,localized corrosion is *** main components of the corrosion product scales are FeCO3 and Cr2O3.

关键词： CO2 corrosion pipe lines weight loss SEM EDS

基于混合模型的混凝土坝物理力学参数反演分析

在线全文

学校读者我要写书评

暂无评论

水电能源科学 2011年第5期29卷 67-69页

作者：冯威张伟河海大学水利水电学院江苏南京210098 河海大学水文水资源与水利工程科学国家重点实验室江苏南京210098 河海大学水资源高效利用与工程安全国家工程研究中心江苏南京210098

针对获取切合实际的坝体和坝基弹性模量是评价大坝安全性态的关键问题,基于混合模型反演方法,结合丰满混凝土重力坝位移实测资料,采用Hypermesh软件建立整体概要模型与单坝段模型进行比较,选取合适的坝基范围,使用Abaqus软件计算水压分... 详细信息

针对获取切合实际的坝体和坝基弹性模量是评价大坝安全性态的关键问题,基于混合模型反演方法,结合丰满混凝土重力坝位移实测资料,采用Hypermesh软件建立整体概要模型与单坝段模型进行比较,选取合适的坝基范围,使用Abaqus软件计算水压分量,编写Fortran程序反演丰满坝典型坝段的坝体和坝基弹性模量。结果表明,该模型反演方法精度较高,结果合理可信。

关键词：混合模型混凝土坝物理力学参数有限元法反演分析弹性模量

Node ordinal encoded genetic algorithm for the optimal allocation of water resources

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2005年第5期15卷 448-452页

作者： YANG Xiaohua1*, YANG Zhifeng 1,2, SHEN Zhenyao1 and LI Jianqiang3(1. State Key Laboratory of water Environment Simulation, school of Environment, Beijing Normal university, Beijing 100875, china 2. Key Laboratory for water and Sediment Sciences Ministry of Education, school of Environment, Beijing Normal university, Beijing 100875, china 3. water resources and Hydropower Planning and Design General Institute, MWR, Beijing 100011, china) State Key Laboratory of water Environment Simulation School of Environment Beijing Normal University Beijing 100875 China Key Laboratory for water and Sediment Sciences Ministry of Education School of Environment Beijing Normal University Beijing 100875 China water resources and Hydropower Planning and Design General Institute MWR Beijing 100011 China

A new method, node ordinal encoded genetic algorithm (NOEGA), is proposed for solving water resources optimal allocation problems, in which the capacity of water resources is split into a number of smaller parts so that successive operations can be overlapped. Our objective is to maximize the whole benefit function. To overcome the “dimensionality and algorithm complexity curse” while searching for solutions and looking for an optimal solution, the operations of one-point crossover operator, gene exchange operator, gene random operator, gene shift operator and node ordinal strings are established. It is proved to be an effective optimal method in searching for global solutions. The NOEGA does not need a diversity of initial population, and it does not have the problem of immature convergence. The results of two cases show that using NOEGA to solve the optimal allocation model is very efficient and robust. In addition, the algorithm complexity of NOEGA is discussed.

关键词： water resources optimal allocation node ordinal code genetic algorithm.

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

河道管理信息系统开发研究

水电能源科学 2009年第3期27卷 130-133页

作者：赵岩缪琴河海大学水文水资源与水利工程科学国家重点实验室江苏南京210098 河海大学水文水资源学院江苏南京210098 宿迁市泗洪县水务局江苏宿迁223900

为实现河道管理科学化、规范化、标准化,针对目前河道管理现状及存在的具体问题,以地理信息系统和数据库为支撑,设计开发了具有一定通用性、可移植性和可扩展性的河道管理信息系统。系统实现了河道信息的数字化,并为用户决策提供了强大... 详细信息

为实现河道管理科学化、规范化、标准化,针对目前河道管理现状及存在的具体问题,以地理信息系统和数据库为支撑,设计开发了具有一定通用性、可移植性和可扩展性的河道管理信息系统。系统实现了河道信息的数字化,并为用户决策提供了强大的技术支持。

关键词：河道管理地理信息系统数据库

Study on the Removal of Iron,Manganese and Nitrate in Groundwater by Biological Ribbon Technology

在线全文

学校读者我要写书评

暂无评论

地学前缘 2009年第S1期16卷 190-191页

作者： Yuchen Li,Yukun Ju school of water resources & Environment,china university of Geosciences(Beijing),Beijing 100083,china

The pollution of iron,manganese and nitrate in groundwater is a huge threat to human *** this study,column experiments of ceramic,manganese sand,ceramic sand,volcanic rock,quartz sand were *** and manganese contents of influent were 3.3 mg/L and 2.1 mg/*** the biofilm became mature,the highest iron and manganese removal rate achieved by manganese sand as a filter *** did a little worse than manganese sand,but other three filter material could not reach

关键词： removal of iron manganese and nitrate groundwater biological ribbon technology

在线全文

学校读者我要写书评

暂无评论

山坡土壤化学性质的空间变异影响

山地学报 2011年第4期29卷 427-432页

作者：冯德锃刘金涛陈喜河海大学水文水资源与水利工程科学国家重点实验室河海大学水文水资源学院南京大学水科学系

选取太湖源头和睦桥小流域为研究对象,通过90个点的土壤现场采样及室内化学性质分析,旨在揭示其空间分布规律及相关地貌影响。35个代表性采样点的分析表明,在山区小流域尺度上,多数点位土壤pH值介于4.03～4.62之间,近似正态分布,其空间... 详细信息

选取太湖源头和睦桥小流域为研究对象,通过90个点的土壤现场采样及室内化学性质分析,旨在揭示其空间分布规律及相关地貌影响。35个代表性采样点的分析表明,在山区小流域尺度上,多数点位土壤pH值介于4.03～4.62之间,近似正态分布,其空间变异较小,土壤全氮和全磷的空间变异居中,土壤有机质和碱土金属(钾、钠、镁、钙)的空间变异性最大。此外,土壤有机质和全氮还具有一定的空间关联性,相关性系数为0.49。地形地貌对土壤化学性质的影响程度不一:随高程增加,土壤中有机质和全氮的含量明显增加,而高程对土壤pH值、全磷及碱土金属的影响则较小;地形坡度对其空间分布的影响较小,而坡向对土壤养分的空间分布有显著影响,偏西及偏北方向的山坡中土壤有机质、全氮和全磷含量要明显高于偏东和偏南的山坡;最后,山坡曲率对土壤有机质的影响也很显著,发散型山坡以及凹型山坡的土壤有机质含量较高,沿山谷线一带土壤有机质的含量亦较高。

关键词：山区小流域土壤化学性质空间变异地貌

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

南湖荡滨水区生态风险评价研究

水电能源科学 2011年第7期29卷 22-24页

作者：聂青陈星河海大学水文水资源学院江苏南京210098

以常熟市南湖荡区域为例,基于景观生态学原理,参考美国国家环保局提出的生态风险评价导则和方法,对南湖荡区域进行了系统的生态风险评价,确立污染、洪涝灾害、滨水景观破碎化为主要风险源。通过对风险区的六类景观生态系统的风险综合评... 详细信息

以常熟市南湖荡区域为例,基于景观生态学原理,参考美国国家环保局提出的生态风险评价导则和方法,对南湖荡区域进行了系统的生态风险评价,确立污染、洪涝灾害、滨水景观破碎化为主要风险源。通过对风险区的六类景观生态系统的风险综合评价,得出南湖荡区域的综合生态风险分布,并提出了南湖荡滨水区不同风险分区的保护建议,对改善区域生态环境具有重要意义。

关键词：生态风险评价滨水区南湖荡区域

Characteristics of trace elements in contaminated rivers and their environmental significance

在线全文

学校读者我要写书评

暂无评论

Acta Geochimica 2006年第S1期 140-141页

作者： Xuyin YUAN1, Zhiyong SHEN1, Xu DENG1, Yun GAO2 1 State Key Laboratory of hydrology-water resources and Hydraulic Engineering, nanjing 210098 hohai university, nanjing 210098, china 2 College of Environmental Science and Engineering, hohai university, nanjing 210098, china