| Popis: |
The technique of modelling of changes of specific electric conductivity and contents of copper and lead in surface waters and extracts from bottom sediments in a mouth of the Mekong river is developed, allowing to receive exact enough conformity to measurements. Measurements of physical-chemical and geochemical parameters are executed by Phung Thai Duong in January, 2013 in the Ham Luong channel (one of large channels of delta of the Mekong river). On the basis of this technique and within the framework of the concept of marginal filter dependence of concentration of some microelements in extracts from bottom sediments in delta of the Mekong river from рН-value of surface waters - the important factor of an orientation of processes of dissolution, sedimentation and co-sedimentation of substances with small solubility in a zone of mixture of sea and river waters, and also formations of sorption capacity of bottom sediments is proved revealed earlier by Phung Thai Duong and co-authors. The model of change of concentration of substances in surface waters and ground adjournment in a zone of mixture of sea and river waters represents the simplified analytical decision of the one-dimensional stationary equation of advective and diffusion flow. Author's interpretation of function of receipt of substances in bottom sediments and surface waters is offered. Approbation of model is carried out for specific electric conductivity, concentration of copper and lead. Parameters of model can be specified in further (especially for Cu and Pb). But as a whole the considered model can be used not only for an explanation of observable changes of a chemical compound of surface waters and bottom sediments in a rivers mouth, but also for planning actions on quality management of components of an environment, for example, by withdrawal of bottom sediments, replacement of sediments with other size of particles, another mineral and a chemical composition, changes of a high-speed mode and so on. |
