梯级水电站联合优化调度系统的开发与应用

梯级水电站联合优化调度系统是一个基于数据库、Matlab、C语言等软件联合开发的应用系统。该系统是在水流量预测和区域负荷预测的基础上,根据短期调度需求、调峰需求,通过优化算法最终得到各梯级水电站之间的负荷分配、站内机组出力以及机组组合状态。以重庆市某梯级水电站为例,仿真结果表明,该系统不仅能直观地反映机组出力,方便调度员发出调度命令,同时该系统的成功应用提高了梯级水电站的水能利用率、节约了发电成本。     

基于高精准三维模型的土石坝整体变形监测研究

本文通过基于球面投影大坝三维表面构建算法构建土石坝表面模型,重建土石坝精确三维表面模型,将第一期数据作为参考数据,利用不同时期采集的点云数据与参考模型进行对比分析来获取大坝变形信息。通过试验验证了本文方法的可行性和实用性。     

植被护坡水流冲刷稳定性试验研究

从植被护坡水流冲刷稳定性设计的角度出发,对紫羊茅草皮及早熟禾草皮分别从坡面流与有压流两个方面进行了水流冲刷稳定性试验。试验结果表明:坡面流间歇冲刷8次,瞬时流速达6.0 m/s,累积冲刷时间120 s,紫羊茅草皮可发生IV级的冲蚀破坏。早熟禾草皮在5.0 m/s的流速下,冲刷1 h后,其草皮层出现最高级别的破坏,测定其发生破坏时的床面剪应力为103.13 Pa,摩阻流速为0.32 m/s。     

河口村水库泄洪洞水力学关键问题研究

通过单体水工模型试验,研究河口村水库高流速泄洪洞的掺气减蚀措施,优化泄洪洞体型。结果表明:1#泄洪洞弧门后突扩突跌掺气体型合理,能形成稳定空腔,达到掺气减蚀目的;2#泄洪洞龙抬头末端突扩突跌掺气效果好,从洞身水面以上取气能满足掺气需求;2#泄洪洞鼻坎顶高程决定了其运行范围及方式,可低于下游最高洪水位。     

鄱阳湖入江径流变化规律及成因分析

为了深入认识鄱阳湖入江流量变化规律,采用多种水文分析方法,研究了湖口水文站1950~2012年径流、洪季径流、枯季径流、年最大流量和枯季最小流量的变化趋势、随机性、突变性和周期性。结果表明,枯季最小流量序列存在显著的增加趋势,其余序列变化趋势不明显;入江径流年内分配趋于均匀、集中度减小。洪季丰枯交替频率高于枯季,年最大流量与枯季最小流量的变化波动尺度比较接近。     

An analysis of dam-break flow on slope

The one-dimensional steep slope shallow water equations are used to model the dam-break flow down a uniform slope with arbitrary inclination, and analytical solutions are derived by the hodograph transformation and the Riemann＇s method in terms of evaluated integrals. An implicit analytical solution is obtained to evaluate the spatio-temporal distributions of dam-break flood hydrographs along the slope. For convenience, the solution for representative wave profiles and velocity distributions is shown in charts. Comparing with the Dressler＇s solution and WES experimental data, the analytical solution is seen reasonable.     

Experimental investigation on diffusive contaminant release from permeable sediment layer under unidirectional unsteady flow

The interfacial diffusive contaminant（phosphorus） release from permeable sediment layer into overlying water column under a unidirectional unsteady（periodic） flow condition was experimentally measured and analyzed. The experimental results indicate that the gross diffusive contaminant release rate is substantially enhanced as compared to that under a steady flow condition, and this enhancement trend is much more pronounced in an immediate release stage. The interfacial diffusive contaminant release rate tends to increase with the increasing flow velocity, decreasing period and augmenting amplitude for the case of the unsteady flow. The additional interfacial diffusive contaminant release under the unsteady flow condition may be related to the hydrodynamic response of the diffusive boundary layer to the flow unsteadiness of the overlying water, depending upon not only the periodic thickness variation of the diffusive boundary layer immediately above the sediment-water interface modulated by the temporal flow velocity of the overlying water column but also the intensified turbulent mixing between the overlying water and the pore-water within the superficial sediment layer induced by an alternate acceleration/deceleration fluctuation during each period.     

Effect of bank slope on the flow patterns in river intakes

In this work, we studied the dimensions of stream tube in the vertical as well as inclined bank conditions. Data were collected from both a physical model and a 3-D numerical model（SSIIM 2）. Equations for predicting stream tube dimensions were presented and compared with existing formulae. In comparison with vertical bank, it is found that inclining bank causes the bottom stream tube width to be greater than at the surface. The strength of secondary current formed at the entrance of branch channel is reduced. These changes in flow pattern can reduce the amount of sediment delivery into the intake.     

Influence of bending rigidity of submerged vegetation on local flow resistance

The different state of the submerged vegetation has different influences on the flow resistance. This paper explores the relationship between the state and the resistance of an individual submerged vegetation, and the relative bending rigidity of the submerged vegetation is determined by the state of the submerged vegetation. Based on the experimental observations, the state and the resistance of an individual submerged vegetation are analyzed under different inflow conditions. At the same time, the influences of the various submerged vegetations on the flow resistance are discussed under the same inflow conditions. Some interesting relationships are obtained between the flow resistance and the relative bending rigidity of the submerged vegetation, and it is shown that the flow resistance increases with the increase of the relative bending rigidity of the submerged vegetation, and they are positively correlated.     

水电站最小下泄流量分析计算——以赣州市留金坝水电站为例

以江西省赣州市留金坝电站为例,选取4种基于水文学的标准流量法分析了水电站影响下的减(脱)水河段最小生态流量。并根据减(脱)水河段生态水文特性,水功能区纳污能力及水质目标要求,基本生产、生活用水需求,河道天然来水量状况和水利工程经济效益等6个方面,比选确定赣州市留金坝水电站减(脱)水河段现状年和规划年的最小下泄流量参考值分别为15.81、16.01 m3/s,为其他类似水电站研究确定最小下泄流量提供参考。