| China is short of water resources, in addition, because recently industry is rapidly developed and people live relatively in mass, much of industrial sewage, agricultural effluent and domestic wastewater that do harm to human being and other creature drain into river, which make limited water resources polluted. Pollutant extends its incidence .by diffusing after dissolving and being carried by water flow. To protect environment and prevent the jeopardize of pollutant, working over hydraulic characteristic of pollutant diffusing is very content from the aspect of hydrodynamics and hydrokinetics.Mixed process of pollutant and water has three moment in the water: the first moment is vertical mixing, primary mixing in depth; the secondt moment is impure mixing, beginning vertical replete mixing and terminating transverse replete mixing, the third process is replete mixing, beginning transect replete mixing.In this paper, diffused hydraulic theories for twenty years recently are generalized, and parts of formulas are derived applying hydrodynamics theory. Based on the holistic system of waterway, applying the diffused hydraulic characteristic of pollutant, diffusing process of pollutant are studied in the river of vertical, abeam and portrait, stress is to analyze the calculation of complanate flow field in two dimension of vertical and abeam and the unidimensional portrait one, exiting hydraulic academic formulas are simplified, mathematical models in point are established, and numerical calculation methods are carried out to solve and programme to more convenient and applicable for the engineers. All is to post the variational rules between concentration and time of pollutant, which can forecast contaminative degree and provide criterion for water quality protection, aquatic environment evaluating and water resources exploiting.Environment capacity is introduced here and theoretic summarized, which is thereunder for different water using purpose containing pollutant gross.
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