文章摘要
武周虎.河流移流离散水质模型的简化和分类判别条件分析[J].水利学报,2009,40(1):
河流移流离散水质模型的简化和分类判别条件分析
Discriminative condition of simplification and classification for applying advection dispersion model for calculating water quality
  
DOI：
中文关键词: 河流  移流离散  水质模型  简化分类  无量纲数  判别条件
英文关键词: river  advection dispersion  modeling of water quality  simplification  classification  dimensionless numbers  discriminative conditions
基金项目:
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 
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中文摘要:
      从描述河流一维移流离散稳态水质模型的基本微分方程出发，通过理论分析指出现行移流离散模型简化、分类方法存在问题，即仅根据O'Connor数的判别条件不全面，会出现排污对上游的影响较大而在计算时却被忽略的情况，按上、下游影响长度的比值为1％和99％作为简化、分类依据不实用。在详细分析河流移流、离散和降解三种作用之间对比关系的基础上，提出了采用O'Connor数α和贝克来数Pe两个简化、分类参数并给出了临界值。给出了新的移流离散水质模型方程的简化、分类判别条件：1)当α≤0.027、Pe≥1时，采用移流模型；2)当α≤0.027、Pe<1时，采用移流离散简化模型；3)当0.027<α≤380时，采用移流离散模型；4)当α>380时，采用离散模型。算例分析表明，新判别条件可以满足实际工程和环境管理的应用要求。
英文摘要:
      The problem in simplification and classification of water quality model at present is pointed out based on the analysis on the basic differential equation describing the 1D advection dispersion steady water quality model. The current discriminative condition is incomplete because it is according to the O'Connornumber (α) only, the significant impact of sewage on the water in upper reaches is ignored, the ratio of affected river length of upper reach to affected river length of lower reach is irrationally simplified as 1% and 99% respectively and classified accordingly. Based on the analysis on the relationships among the advection, dispersion and degradation actions, both the O'Connor number and Peclet number Pe are suggested as the discriminative parameters for simplification and classification of the model for calculating water quality. The critical values are: 1.if α≤0.027 and Pe≥1, the advection model is suitable; 2if α≤0.027 and Pe<1, the simplified advection dispersion model should be selected; 3.if 0.027<α≤380, the advection dispersion model is the best; 4if α>380, the discrete model must be selected. The application example shows that the proposed discriminative conditions are helpful to environmental management and engineering practice.
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