|
Articles of report , the major methods make use of Implicit
Newton- Raphson scheme, from the momentum equation of
unsteady flow to process the numerical analysis of
the low level paddy then simplify the momentum equation of
unsteady flow to the momentum equation of
nonuniform flow(Diffusive Tank Model) .
The results of simulation will show the precision of the model
of unsteady flow is better than nonuniform flow, when
used on the big basin we have some problems , for example ,
complex hydraulic computation , cause computer time too
long 、the memory of computer is not enough
.but the model of nonuniform flow is used on the same situation
, we find it can speed up the computer time , decrease the
computation that needs memory capacity , the precision is
good , and we can be qualified to divert to PC (personal
computer). The
purpose of our research establishes a drainage system that is
exact and gain results quickly , else we can operate in
field easily. The nonuniform flow model satisfies our
needs , therefore , we suggest to use nonuniform flow model
which can provide the reference of assessment and design
of drainage network , when build the drainage network of low
level paddy in Taiwan .
|