明渠非恒定流污染物迁移扩散研究
首发时间:2014-01-08
摘要:【目的】研究非恒定流的水流特性以及污染物的迁移转化规律。【方法】采用有限差分法的扩散格式离散一维圣维南方程组,给出非恒定流的水流特性。拉格朗日法和欧拉法相结合模拟污染物在水体中的迁移转化过程。【结果】渠道有旁侧入流时约1500m以后,单宽流量的大小对水位几乎没有影响。旁侧入流导致整个渠道的流量降低,并且随着单宽流量的增大渠道流量的变化幅度更大。随时间不断的增加污染物浓度逐渐减小,污染带逐渐变宽。【结论】旁侧入流对渠道的水位和流量都有不同程度的影响。将对流项和扩散项分开求解可用来解决污染问题。
关键词: 非恒定流;水流特性 两步走;污染物;迁移扩散
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Study on Diffusion and Transference of Unsteady Flow pollutants in open channel
Abstract:【Objective】Research the water flow characteristics of the unsteady flow and migration and transformation rules of pollutants. 【Method】Adopt the method of characteristics to solve the one-dimensional saint-venant equations, present hydraulic elements of the unsteady flow. 【Result】The size of the discharge per unit width of water has little impact in the section of 1500m on the downstream the side of the drain. The side inflow results in the decrease of the flow of the whole channel, and with the increase of discharge per unit width variation amplitude channel flow is greater. The pollutants concentration decreases over time, the damage zone widened gradually. 【Conclusion】Side inflow has the influence of different level to channel water level and flow rate. It can be used to solve the problem of tidal channel pollution diffusion when convection and diffusion are solved separatedly.
Keywords: unsteady flow water flow characteristics two steps pollutants convection and diffusion
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