水力发电学报2014，Vol.33Issue(3)：195-202,8.
阶梯溢流坝与跌水建筑物复氧能力预测研究
Prediction of re-aeration capability of flows over stepped spillways and hydraulic drop structures
摘要
Abstract
Content of dissolved oxygen is a key factor in maintenance of ecological environment for rivers,especially for the urban rivers.Spillway dams constructed on rivers not just have function of water storage,but cause a certain amount of air to be entrained into the water through flow turbulences in the discharging process so that the dissolved oxygen content of released flow is significantly increased.To predict flow re-aeration capability of different spillway shapes,this study focuses on two typical types of dams,i.e.lower stepped spillway and dropping hydraulic structure.For stepped spillways,laboratory experiment was conducted to test 34 cases of different combinations of the step height (or width) and flow rate.In each case,dissolved oxygen concentration and water temperature were measured at the dam's crest and toe and location of air entrainment inception was observed.From the measurements,a quantitative formula was established for re-aeration coefficients versus discharge per unit width,step height,and spillway slope.For dropping hydraulic structures,totally 32 sets of field measurement data were collected,and by using these data a quantitative formula of re-aeration coefficients versus dropping discharge,dropping height and depth of tail water,was also derived.The two formulas provide quick evaluation of re-aeration capability and the present work would lay a theoretical basis for lower spillway dams design optimized for environmental protection.关键词
环境水力学/复氧能力/预测/阶梯建筑物/跌水建筑物Key words
environmental hydraulics/ re-aeration capability/ prediction/ stepped spillway/ hydraulic drop structure分类
建筑与水利引用本文复制引用
周新民,曾映雪,程香菊..阶梯溢流坝与跌水建筑物复氧能力预测研究[J].水力发电学报,2014,33(3):195-202,8.基金项目
国家自然科学基金项目(50979118) （50979118）
中央高校基本科研业务费专项资金资助 （）
