闽江下游河道污染物变化过程的动态模拟

根据非恒定流运动的圣维南方程组,以及污染物浓度变化的一维带源项对流扩散方程,建立了闽江下游河道一维动态水动力水质模型,率定了糙率、纵向离散系数和污染物降解系数,验证了模型的合理性.计算结果表明,模型下边界定在梅花断面,为研究包括福州段在内的马尾(白岩潭)以上河段的水环境问题提供了适当的条件;河道来水污染负荷总量、流量和浓度条件对南、北港水质影响显著.

Numerical Simulation on Variation of the Contaminants in the Watercourse,Lower Reaches of Minjiang River

Based on the Saint-Venant equations and onedimensional Advection-Dispersion equation,one-dimensional dynamic water quality models for the lower reaches of Minjiang River are set up.According to the simultaneous observation data,main parameters are calibrated.The rationality and reliability of the models are validated by the computation results.Conclusions are drawn applying the verified models,they are:(1) it is appropriate to set the Meihua transect as the lower boundary of the models to study the aquatic environmental issues of the reach up to Mawei,which includes Fuzhou reach;and,(2) the total pollution load,discharges and contaminant concentrations together impose a remarkable influence on water quality both in the South and North watercourses of Minjiang River.