倾斜岸河库水面污染源下浓度分布的理论分析  

Theoretical analysis of pollutant concentration distribution due to water surface pollution source in river and reservoir with sloped-bank

作　　者：武周虎[1] 

机构地区：[1]青岛理工大学环境与市政工程学院,青岛266033

出　　处：《水动力学研究与进展（A辑）》2012年第4期449-455,共7页Chinese Journal of Hydrodynamics

基　　金：国家自然科学基金资助项目(50979036)~~

摘　　要：从保守物质横向和垂向扩散系数不相等的静止水体中瞬时线源二维扩散的解析解人手,分析推导出半无限水面瞬时污染源下二维扩散的浓度计算公式。在顺直倾斜岸坡大宽度深水情况下,借助于横向和垂向扩散系数不相等的角形域映射原理,进而推导出倾斜岸水面瞬时污染源下角形域中二维扩散浓度分布的理论公式。在简化条件下该理论公式与可对比理论解完全一致。结果分析与讨论表明:角形域倾角对污染物的浓度分布影响较大;角形域内浓度分布具有倾角参数n(180/)为奇数和偶数不同的双重特性;计算点距离岸坡顶点越近倾斜岸坡对浓度分布的影响越大;横坐标越大影响越小;水深越大影响也越小。该理论公式可为河库水质监测布点与数据的归纳分析、水质模型的验证和污染混合区浓度估算提供有力的工具。Based on the analytical solution of two-dimensional diffusion of instantaneous line source in static water, which has different diffusion coefficients in transverse and vertical directions for conservative substance, the formula of the two-dimensional diffusion under the condition of instantaneous semi-infinite surface pollution source was analyzed and deduced. In the case that the river and reservoir is wide and deep enough with straight sloped-bank, the formula to describe the diffusion concentration distribution caused by instantaneous surface pollution source in angular field was deduced. Angular field mapping theory for the different diffusion coefficients in transverse and vertical directions was employed during the deducing process. The analysis and discussion indicate the theoretical formula agree perfectly with comparable theoretical solution under the simplified condition. The pollutant concentration distribution strongly depends on the slope of the angular field and shows dual features related to the parity of slope coefficient n=lSO/O. In the spatial point of view, the sloped bank effect on the distribution is more obvious near the vertex and decline. The theoretical formula could be a powerful tool in river and reservoir water quality monitoring planning, water quality model validation and pollution mixing distribution estimation.

关 键 词：倾斜岸坡 角形域 水面污染源 浓度分布 理论分析 

分 类 号：X143[环境科学与工程—环境科学] X524