Czasopismo | GAZ, WODA I TECHNIKA SANITARNA | Rocznik 2016 - zeszyt 4

Dispersion process in urban sewer networks under dry weather conditions

10.15199/17.2016.4.7

nr katalogowy: 97818
10.15199/17.2016.4.7

The paper describes determination of dispersion coeffi cients in sewer, which is from hydraulic point of view a prismatic and straight stream channel with relatively constant roughness of streambed. Field experiments were performed in a straight sewer sections and also in the part with sewer direction changes. Both were done under dry weather fl ow conditions, i.e. with relatively low pipe fi lling, discharges and velocities. Consequently, the dispersion coeffi cient in a sewer line with various direction changes was determined. At the end of the paper the observed effect of «dead zones» is described, which theoretically should not occur in conditions of our experiments (prismatic channel with no obstacles) and discuss its root cause.Introduction Sewer network is in term of the pollution transport a very complex system, in which physical, chemical and biological reactions and processes take place. All these processes and reactions impact the resulting pollution mass concentration and its time course. This paper is focused on two important physical processes - advection (mechanical transport of the pollutant by fl owing fl uid) and dispersion. Dispersion, from hydrodynamic point of view, is the spreading of mass from highly concentrated areas to less concentrated areas in fl owing fl uid. Mass in fl owing water is not transported only in the reach of streamline, but it is also gradually spreading to outside in consequence of velocity pulsations and mass concentration differences. Mass dispersion with advection is basic motion mechanics of particles, transported in water. Reductions of maximum concentrations are results of their effects. The main characteristics of dispersion are dispersion coeffi cients in relevant directions. Determination of these dispersion characteristics is the key task for solving problem of pollutant transport in streams and for modelling of water quality. The simplest description of the mass [...]

Bibliografia

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