武周虎.有限时段源一维水质模型的求解及其简化条件[J].中国水利水电科学研究院学报,2017,(5):397-408
有限时段源一维水质模型的求解及其简化条件
Solution and simplified conditions of one-dimensional water quality model in the limited period source
投稿时间:2016-12-15  
DOI:10.13244/j.cnki.jiwhr.2017.05.011
中文关键词:  环境水力学  有限时段源  瞬时源  河流水质模型  拉普拉斯变换  浓度分布  临界时间  简化判别条件
英文关键词:environmental hydraulics  limited period source  instantaneous source  water quality model of river  Laplace transform  c oncentration distribution  critical time  simplified criteria
基金项目:国家自然科学基金资助项目(51379097)
作者单位
武周虎 青岛理工大学 环境与市政工程学院, 山东 青岛 266033 
摘要点击次数: 428
全文下载次数: 465
中文摘要:
      有限时段源一维水质模型的求解及其简化为按瞬时源处理的判别条件,对事故性排放污水的应急计算具有十分重要的意义。在等强度有限时段源条件下,采用变量替换和拉普拉斯变换方法,求解了河流污染物浓度分布的解析解。在不同的简化条件下,讨论了该解析解与可对比解析解的一致性。定义了排放数Wt=u2t0/Dx,提出了有限时段源可以按瞬时源计算的临界时间tkWt)方程和简化判别条件:当扩散历时t<tk,按有限时段源的浓度分布公式计算;当扩散历时ttk,按瞬时源的浓度分布公式计算。
英文摘要:
      The solution of one-dimensional water quality model in limited period source the criteria for sim-plifying the model as instantaneous source are very important to calculate accidental discharge of sewage in emergency. Analytic solutions of pollutant concentration distribution in rivers are given using variable substi-tution and Laplace transform method under the condition of equal intensity limited period source. The consis-tency between the above analytic solution and comparable analytic solutions are discussed under different simplified conditions. The Discharge number, Wt=u2t0/Dx, is defined. The critical time, tk (Wt), is given in which limited period source can be calculated by using instantaneous source. The simplified criteria are when diffusion time t<tk, the concentration distribution formula of limited period source is used and when ttk,the formula of instantaneous source is used.
查看全文  查看/发表评论  下载PDF阅读器
关闭