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河流中污染物垂向紊动混合规律及其应用研究 【作者】杜彦良 【导师】褚君达

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1L2PB/u$p9YfS0【作者】杜彦良导师褚君达
Al\1|`*H [0【作者基本信息】河海大学,环境工程,2001年,博士

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【中文摘要】 天然河流中的紊动混合及输移规律,是一个在学术上及应用上都具有重要意义的研究课题,国内外学者曾进行大量的室内外的实验、理论分析和应用研究,取得许多研究成果。本文在总结分析前人研究成果的基础上,通过理论推导、现场资料分析和数值模拟相结合的方法,着重研究天然河流中物质的垂向紊动混合、输移的基本规律,并将这些规律运用于数学模型的数值计算中。 首先研究了河流中点源污染物排放的垂向紊动混合规律。通过理论推导,分别得到瞬时点源和连续点源浓度场在垂向上达到全水深均匀混合的纵向距离的理论计算公式;进一步研究排放口至全水深均匀混合距离之间水域的污染物垂向紊动混合过程,首次提出了部分均匀混合水深的新概念,推导得到部分均匀混合水深随纵向距离变化规律的表达式。用长江南京段等实测资料验证上述公式,取得较好结果。文中还分析了不同深度点源排放对浓度场的影响。 研究了河流中表面不同深度线源污染物排放的垂向紊动混合规律。通过理论推导,得出任意位置上瞬时线源浓度场的解析解表达式;推导得到表面不同深度线源排放时垂向部分均匀混合水深随纵向距离变化规律的函数关系,并建立了相应变化规律的诺莫图;导出了表面不同深度线源在全水深均匀混...更多合时的纵向距离的计算公式,应用长江口南通河段实测资料验证,得到一致结果。 研究建立了部分水深均匀混合的二维水质新模型。该模型去掉了传统的全场水深平均二维模型污染源一出排放口便在水深方向上均匀混合的假设,而将计算水域划分为污染物浓度在垂向上达到部分水深均匀混合及全水深均匀混合两个区域,并将上述有关部分水深均匀混合及全水深均匀混合的基本规律的研究成果应用该模型中。用长江河口段罗丹明示踪剂瞬时源排放浓度场现场跟踪监测资料对该模型进行验证,并与传统的全场水深平均二维模型的计算值进行了比较。可以看出,新建的部分水深平均水质模型计算值与实测值符合较好,而传统的全水深平均模型在排放口近区范围内计算浓度值及污染带范围明显小于实测值。因此新建立的部分水深平均二维水质模型与全水深平均模型相比具有更高的计算精度。新建模型与三维计算模型相比具有节约计算 河海大学博土学位论文(摘要)资源、降低计算复杂度及提高计算效率等优点。因此新模型具有较高的应用价值。 研究了潮汐河口随时间及空间变化的垂向紊动混合规律。潮汐河口水流呈往复振荡运动,本文在分析潮汐河口水动力特性基础上,考虑了惯性力及重力等项的影响,通过理论推导得到潮汐河口垂向紊动交换系数的空间分布及时间分布的计算公式,以及垂向平均紊动交换系数的时间分布的计算公式,并将其应用于潮汐河口的实际计算中。 最后,本文运用拟合坐标下的三维k。紊流模型对测验河段进行计算,得到特征时刻该潮汐河口段的水力要素及垂向紊动混合系数的分布。用该模型对定点排放浓度场进行模拟计算,并与前述部分水深平均二维模型的计算值进行比较分析。  还原水利论文1|y(L9~)k2G/_g.D

\:[KJ6B2{WB0【英文摘要】 Law of Vertical Turbulent Mixing of Pollutant in Natural River and its Application(Ph.D. Dissertation) Doctoral Candidate: Du YanliangAdvise: Prof. Chu Junda Hohai University, Nanjing. P.R.CAbstractThe study of the turbulent mixing and transportation in the natural river is of theoretical and practical importance. Plenty of indoor and outdoor experiments, theoretical analysis and application research on this object have been performed, and have bought about a lot of results by many investigators. On the base of summarizing the results, the law of vertical turbulent mixing and transportation in the natural river is researched and applied in numerical model through the theoretical derivation combined with analysis of the data of measurement in this dissertation.First of all, the vertical mixing law of point source in the river is studied. By the theoretical derivation, the equation of the vertical homogeneous mixing distance of the continuous and instantaneous point source is developed. ...更多The definition of the part depth of homogeneous mixing is given, and its equation is obtained. These equations are verified by the measure data, such as the data of Nanjing section in Yangtse River, and the results are satisfied. In consideration of the influence of vertical mixing, the concentration field is calculated in the tentative channel. In comparison with the concentration field, which is calculated by traditional model, it is found that the effect of the vertical turbulent mixing on concentration field in the near field is large, while the effect in the far field is small. At the end of this chapter, the influence of the depth of discharge point on the concentration is analyzed.The vertical mixing law of the linear source in the natural river has been studied in the second step. At first the concentration equation of the linear source at different depth has derived. By the theoretical analysis, the relationship between the distance of the vertical homogeneous mixing and the part depth of homogeneous mixing, and the equation calculated distance of whole depth homogeneous mixing for the linear source have been presented. These equations are verified by the measure data in Nantong section in Yangtse River, and the results are satisfied.On the base of the vertical mixing law, the part depth homogeneous mixing 2D numerical model has been developed, and it was used in the concentration field calculation. By use of the measure data of Rbodemine-B tracer in Yangtse river estuary, the comparison of value calculated with data measured has been made. The value calculated by the new model approximates the measure data, and the value that calculated by the whole depth mixing 2D model is much less than the measure data in the near field. This model is also superior to the traditional 2D model for its precision. The new model saves lots of time and resource of computer and has more facilitation when it compares with the 3D numerical model.In the tidal estuary, the current is complex, and the flow is oscillatory. Some experiential formulation has presented to calculate the vertical turbulent mixing coefficient. On the base of analysis of the hydrodynamic in the estuary, the theoretical equation, which describes the distribution of the space and time of vertical turbulent exchange coefficient, has developed, the equation has applied to the practice.To analyze the hydrodynamic structure of the estuary, 3D K- numerical model with curvilinear fitted coordinate has developed. The distribution of velocity and turbulent exchange coefficient at different time has obtained and analyzed. The concentration field calculated by the 3D numerical model approximate to that calculated by the partial depth homogeneous mixing 2D numerical model.  还原

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Y ?1?4yh,RAH8w'|3s L0【中文关键词】 紊动混合; 连续源; 瞬时源; 垂向均匀混合距离; 部分均匀混合水深; 垂向紊动交换系 数; 数值模型; 潮汐河口
sVb;_ M(C {0【英文关键词】 vertical turbulent mixing; point source; instantaneous source; distance of vertical homogeneous mixing; partial depth of vertical homogeneous mixing; vertical turbulent exchange coefficient; numerical model; tidal river
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TAG: 导师 河流 污染物 杜彦良 褚君达
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