4 research outputs found
Analysis, Modelling and Planning the Communal Sewarage Systems
The hydraulic calculations of sewage networks are done
ususally by the use of nomograms being the diagrams
that show the relation between the main network parameters
like pipe diameters, flow rates, hydraulic slopes
and flow velocities. In traditional planning of sewage
networks the appropriate hydraulic values are read mechanically
from the the nomograms. Another way of
calculation is the use of professional programs like the
SWMM5 hydraulic model and genetic or heuristic optimization
algorithms. In the paper still another way of
realizing the hydraulic and planning calculations is presented
in which the basic hydraulic rules and formulas
describing the sewage networks and their functioning
are used. The numerical solutions of nonlinear equations
resulted from the formulas and describing the main phenomena
of sewage flows are used in the paper to solve
the tasks of hydraulic calculation and planing of the networks
Mathematical modeling and computer aided planning of communal sewage networks
In the paper the basic questions connected with modeling of
wastewater networks are presented. Methods of modeling
basic sewage parameters and appropriate calculation algorithms
are described. The problem concerns the gravitational
networks divided by nodes into branches and sectors.
The nodes are the points of connection of several network
segments or branches or the points of changing network
parameters as well as of location of sewage inflows to the
network. The presented algorithms for networks hydraulic
calculation concern sanitary or combined sewage nets. It is
assumed that the segments parameters such as shape, canal
dimension, bottom slope or roughness are constant. Because
of these assumptions all relations considered concern
the steady state conditions for the network. The calculation
of flow velocities and the filling heights in the segments of
the wastewater net are carried out for the known slopes
and diameters of the canals
Computer Dynamic Modelling of Communal Sewage Networks
In the paper two algorithms of dynamic modeling of
communal sewage networks are presented. It is assumed
that the hydraulic parameters of segments, namely canal
shape, canal dimension and roughness are constant. The
goal of the algorithms is to calculate the main sewage
network parameters using only the continuity equation
and the Manning formula. In the algorithms, fundamental
algebraic formulas describing the filling heights in the
canals and the sewage flow velocities are also used. The
network model based only on the Manning formula and
continuity equation in difference form and not on the
liquid equations as it is used commonly by modelling the
sewage networks is simpler and faster in calculations.
While modeling the networks fixed network structure
and slowly changing sewage inflows into the canals are
assumed. The forecasted inflow values are stated and
the investigation presented concerns the sanitary and
mixed gravitational sewage networks