| 武周虎,任杰,黄真理,武文.河流污染混合区特性计算方法及排污口分类准则Ⅰ：原理与方法[J].水利学报,2014,45(8): |
| 河流污染混合区特性计算方法及排污口分类准则Ⅰ：原理与方法 |
| A computational method for the characteristics of pollutant mixing zone in rivers and the sewage outfall classification criteria Ⅰ. Principles and methods |
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| DOI： |
| 中文关键词: 河流 离岸排放 污染混合区 几何特征参数 均匀混合距离 排污口分类准则 |
| 英文关键词: rivers off-bank discharge pollutant-mixing zone geometric characteristic parameter uniform mixing distance sewage outfall classification criterion |
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| 中文摘要: |
| 在连续点源离岸排放条件下，从考虑河流纵向移流、横向扩散的简化二维方程解析解出发，对基于环境扩散的宽阔河流探讨了污染混合区的计算方法。给出了污染混合区边界曲线的标准方程及无量纲形式；分别给出了离岸系数0≤η≤2 和η＞2 两种类型污染混合区5个特征点各参数及面积与离岸系数η 的关系曲线，分析了各参数的变化规律， 提出了以离岸系数η 作为判据的分类参数和临界条件。给出了河流岸边、离岸与中心排放的分类判别准则：（1）当0≤η≤0.7 时， 简化为岸边（近岸）排放类型；（2）当0.7＜η＜2.3 时， 称为离岸排放类型；（3）当η≥2.3 时，简化为中心排放类型。对河流离岸排放提出了达到全断面均匀混合距离的计算公式，比现行公式有所改进。为河流排污口位置的优化设计和控制排污量计算提供了分类、简便、快捷的理论方法，具有重要实用价值。 |
| 英文摘要: |
| Upon the condition that continuous point source is discharged off-bank in rivers those are wide according to their environmental diffusion， calculation method for the pollutant-mixing zone was derived from the simplified two-dimensional transport equation which considers the longitudinal advection and transvers diffusion. Standard and non-dimensionalized equations for the boundary of the pollutant-mixing zone were obtained. Two kinds of pollutant-mixing zone were identified by the off-bank coefficient： 0≤η ≤2 and η ＞2. Relations between the five characteristic parameters， plus the area of the zone， and η were found. The changing pattern of the parameters was analyzed. The off-bank coefficient η was proposed as the classification parameter， providing the criteria for the categorization. The classification criteria for river bank，off-bank and river center discharge types are：① for 0≤η≤0.7，the outfall can be simplified as the type of river bank （near-bank） discharge； ② for 0.7＜η ＜2.3， it is named the type of off-bank discharge； ③ for η ≥2.3， the outfall can be simplified as the type of river center discharge. The current equation of the distance has been improved to reach full section uniform mixing in off-bank river discharge. The result provides classified， simple and convenient theoretical method for the optimization of outfall location and for the pollution load control calculation thus has important practical value. |
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