南水北调东线工程沿线城市尾水处理方案比选

以洪泽县为例,综合运用水文学和生态学等理论和方法,研究南水北调东线工程沿线城市尾水处理方案的选择,最终确定蓄水塘-廊道-兼性塘-表面流湿地组合的尾水处理方案,并建议将处理工艺与景观建设相结合,建成集生态、景观、休闲、科教等功能于一体的综合性示范工程。     

河曲引黄灌溉工程隧洞施工的质量控制

介绍河曲引黄灌溉工程隧洞施工前准备、洞挖、洞挖支护、隧洞衬砌等隧洞施工阶段的质量控制工作.     

南水北调工程法治建设研究

在分析南水北调工程有关法律、法规、方针、政策等法制建设现状和问题的基础上,通过分析南水北调工程建设及建成后的运行、管理、保护等工作实际和发展趋势,借鉴国内外跨流域调水等基础设施的建设管理经验,从法制体系建设的高度,对南水北调工程下一步亟需采取的法制建设思路和相关措施进行研究探讨。     

南水北调中线工程北汝河段串流区淹没解决方案分析

北汝河和石河之间以及石河右岸地势较低,北汝河和石河洪水漫溢出槽;南水北调中线工程总干渠及各河道建筑物修建后缩窄了行洪断面,对河道的行洪产生一定影响,上游水位壅高、淹没时间延长,上游耕地和村庄淹没水深有所增大。结合北汝河串流片特点对淹没影响进行处理,选定了征迁安置、河道防护、河道治理、河道防护与河道治理结合4个处理方案进行研究比选,按照技术可行、经济最优并最大限度的保障受淹没影响村民安居乐业的标准,选定方案三即河道治理方案为最优方案。     

通用水资源调配模型WROOMⅡ：应用

本文以南水北调中线水资源调配为实例,采用通用水资源优化调配模型WROOM进行45年长系列建模、求解及结果分析。首先,根据南水北调中线水资源系统特点,提出了WROOM模型在南水北调中线水资源调配中系统概化的指导思想;然后,阐述了模型设置方案的基本思路,采用多种优化方法,以供水优先级与是否考虑农业生态供水为控制参数选取了5种方案,并进行建模求解。通过对不同控制参数下供需平衡的对比分析,说明了不同方案的特点,可以为中线水资源实时调度方案的制定提供参考。     

Modeling And Performance Evaluation Of Branch And Value Prediction In Ilp Processors

Speculative execution is one of the key issues to boost the performance of future generation microprocessors. In this paper, we introduce a novel approach to evaluate the effects of branch and value prediction, which allow the processor to execute instructions beyond the limits of control and true data dependences. Until now, almost all the estimations of their performance potential under different scenarios have been obtained using trace-driven or execution-driven simulation. Occasionally, some simple deterministic models have been used. We employ an analytical model based on recently introduced Fluid Stochastic Petri Nets (FSPNs) in order to capture the dynamic behavior of an ILP processor with aggressive use of prediction techniques and speculative execution. Here we define the FSPN model, derive the state equations for the underlying stochastic process and present performance evaluation results to illustrate its usage in deriving measures of interest. Our implementation-independent stochastic modeling framework reveals considerable potential for further research in this area using numerical solution of systems of partial differential equations and/or discrete-event simulation of FSPN models.     

利用南水北调工程供水解决白洋淀缺水的构想

受资源性缺水和水质性缺水影响,白洋淀湿地生态系统逐步退化。近年来,虽凭借应急调水,多次避免了干淀危机,但长期的资源性缺水,使淀区生态功能受到严重影响。南水北调中线工程的建设实施,为解决白洋淀生态缺水问题带来了机遇。通过在南水北调总体规划与水资源调度原则的基础上,对利用南水北调水补充白洋淀进行了研究,提出了江水补淀初步方案。     

南水北调大型渡槽温控防裂技术应用研究

通过对南水北调工程大型渡槽在混凝土材料优化、施工方案和方法、施工期温控措施、后期表面养护等温控防裂措施进行总结,从材料配合比优化、结构限裂设计、施工期质量管理、混凝土温度监测和预报、温控信息共享等角度预测了渡槽温控防裂技术的发展趋势。工程实践表明,这些温控措施联合使用,防裂效果十分显著。     

NUMERICAL SIMULATION OF PROPAGATION AND BREAKING PROCESSES OF A FOCUSED WAVES GROUP

A two-dimensional numerical wave flume is developed to study the focused waves group propagation and the consequent breaking processes. The numerical model is based on the Reynolds-Averaged Navier-Stokes (RANS) equations, with the standard k-ε turbulence model to simulate the turbulence effects. To track the complicated and broken free-surface, the Volume Of Fluid (VOF) method is employed. The numerical model combines the "Partial Cell Treatment (PCT)" method with the "Locally Relative Stationary (LRS)" concept to treat the moving wave paddle so that various waves can be generated directly in a fixed Cartesian grid system. The theoretical results of the linear and nonlinear waves are used to validate the numerical wave flume firstly, and then a plunging breaking wave created by a focused waves group is simulated. The numerical results are compared to the experimental data and other simulation results, with very good agreements. The turbulence intensity, the flow field and the energy dissipation in the breaking processes are analyzed based on the numerical results. It is shown that the present numerical model is efficient and accurate for studying the waves group generation, the waves packet propagation, and the wave breaking processes.     

某水电站导流兼泄洪洞水工模型试验

通过对新疆某水电站导流兼泄洪洞水工模型试验,在原设计方案采用传统底流消能不满足消能效果的前提下,采用设置消力墩和掺气槽方式进行优化。试验证明：优化方案能有效地改善消力池内的水力特性,起到稳定水流流态,提高消能效率,消能率可达到59.32%-67.91%。