| 河流离岸排放污染物二维浓度分布特性分析 |
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| 引用本文： | 武周虎. 河流离岸排放污染物二维浓度分布特性分析[J]. 水科学进展, 2015, 26(6): 846-856. DOI: 10.14042/j.cnki.32.1309.2015.06.011 |
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| 作者姓名： | 武周虎 |
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| 作者单位： | 青岛理工大学环境与市政工程学院, 山东青岛 266033 |
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| 基金项目： | 国家自然科学基金资助项目(51379097) |
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| 摘 要： | 从河流移流扩散二维简化方程的解析解出发,考虑两岸边界反射作用,通过离岸排放条件下的系列计算实验、浓度图谱绘制、数学归纳和分析整理,提出了以相对离岸距离a'(=排放口离近侧河岸的距离a/河宽B)为自变量的宽阔与中宽河段的分类线x1.2'方程;提出了断面最大浓度轴线的定义、分段方程以及简化分段条件,给出了最大浓度轴线x轴段与弯曲段的分段线xe'方程、弯曲段与靠岸段的临界线xk'方程以及断面最大相对浓度沿程分布的分段简化计算公式,提出了河流中心线和两岸线上相对浓度沿程分布的计算公式,为河流水环境影响预测与评价提供了理论支持.
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| 关 键 词： | 河流 离岸排放 边界反射 二维浓度分布 河段分类条件 最大浓度轴线 |
| 收稿时间： | 2015-02-22 |
Analysis of the characteristics of the two-dimensional pollutant concentration distribution in river offshore discharge |
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| WU Zhouhu. Analysis of the characteristics of the two-dimensional pollutant concentration distribution in river offshore discharge[J]. Advances in Water Science, 2015, 26(6): 846-856. DOI: 10.14042/j.cnki.32.1309.2015.06.011 |
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| Authors: | WU Zhouhu |
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| Affiliation: | School of Environmental and Municipal Engineering, Qingdao Technological University, Qingdao 266033, China |
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| Abstract: | It has been proved that analysis of the two-dimensional pollutant concentration distribution characteristics during the expansion of contaminated zone in river-offshore discharge, and prediction of the concentration on the environmental sensitive sites have aroused a considerable attention of the academic and engineering communities. Its boundary reflection being taken into consideration based on the analytical solution of the simplified two-dimensional advection-diffusion equation for rivers, the formula of x1.2'threshold, which categorizes the wide-and medium-wide rivers based on the relative offshore distance a' (defined as the ratio between the distance from the discharge outfall a and river width B), has been proposed through series computational experiments on off-shore discharge, concentration distribution contouring, and mathematical induction and analysis. The definition of maximum concentration axis in river cross-sections has been proposed, along with its piecewise equations applying to each sub-situation classified by certain criterion. The thresholds xe' and xk' separating the x-axis segment, curved segment and near-shore segment of the defined maximum concentration axis are given with a simplified calculation formula for cross-section maximum relative concentration, relative concentration along the centerline and banks of the rivers for each segment. The results afford a theoretical basis for the prediction and assessment of the river water environmental impact. |
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| Keywords: | river offshore discharge boundary reflection two-dimensional concentration distribution river classification condition maximum concentration axis |
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