Ultraflux Uf 811 CO, Руководство пользователя, Страница: 42 / 106

42
NT UF 811 CO GB (c) / March 2014
5.4.3 "Section Description" menu
This menu is used to describe the section of the channel or the river.
1) Section description
For each chord, enter the elevation of the plane of the chord with regard
to the plane H0 and the two widths with regard to the plane W0 (H0 and
W0 defined in part 5.2.1, point 3). This section can be defined in 20
points.
It is possible to define a distance to the right and to the left of the plane
W0.
2) Gauge offset
3) Surface S0
When the bottom of the channel or the river is difficult to describe in terms of section (for example if there is
sand silting, pebbles, etc.), it can be estimated using parameter S0 which defines a surface of the section in
which the velocity is constant.
If this parameter is positive, the calculation of the flow adds this section to the hydraulic section (erosion of
the channel) and considers a constant fluid velocity equal to the lowest hydraulic section velocity.
If the value of S0 is negative, the value of S0 is deducted from the section and it is considered that so long
as the wetted section is smaller than S0, the flow is null (silting). The aim is to simulate silting of the
channel.
The gauge offset is the numerical value used to
switch from the section description reference system
("height reference system") to the customer
reference system ("level reference system").
Level 0 (customer reference
system)
(plane or height H0,
Ultraflux reference system)
Level (water level gauge)
Scale offset