HYDRAULIC MODEL OF TRICKLE-IRRIGATION LATERALS - IWRA
HYDRAULIC MODEL OF TRICKLE-IRRIGATION LATERALS - IWRA
HYDRAULIC MODEL OF TRICKLE-IRRIGATION LATERALS - IWRA
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F<br />
SUM<br />
=<br />
N<br />
∑[ qTEOR<br />
− qEXP<br />
]<br />
j=<br />
1<br />
where: N is the number of emitters along lateral;<br />
2<br />
q TEOR<br />
(14)<br />
is the data for emitter discharge<br />
obtained by the model, and q EXP<br />
is the experimental data for the flow rate and then the<br />
minimum of the function F SUM<br />
have to be searched. The optimum values for the<br />
obtained α and δ , as a result, areα = 1, 10 , δ = 0, 1, respectively. The minimal value of<br />
δ is due to the small dimensions of the dripper and the sensitive decrease of the flow<br />
velocity just next to the dripline wall.<br />
Subsystem2<br />
1<br />
In<br />
O ut1 O ut2 O ut3 O ut4<br />
In1Out1<br />
In2Out2<br />
In3Out3<br />
In4Out4<br />
Subsystem<br />
In1<br />
Out1<br />
In2<br />
In3<br />
In4<br />
Out2<br />
I 5<br />
Fig.1. .Block-scheme of the model by program SIMULINK –MATLAB<br />
To File<br />
9.81<br />
g<br />
1<br />
1/uIn1<br />
1/g<br />
Gain<br />
Prod<br />
Pr1<br />
10<br />
h0<br />
1<br />
s x o<br />
h<br />
Pr13<br />
h12.ma<br />
|u|<br />
Abs<br />
Prt1<br />
Scope1<br />
u v<br />
0.48<br />
k1<br />
-1<br />
3 Out3<br />
3599971<br />
1/so<br />
1/u<br />
so<br />
0.3<br />
Fq2<br />
2.7778e-7<br />
h^k1<br />
k<br />
0.579<br />
3599971<br />
Fq3<br />
Qi2<br />
1.1e-4<br />
Qo<br />
Pr3<br />
Fq1<br />
Q55.ma<br />
To File1<br />
1<br />
s x o<br />
Q<br />
4 Out4<br />
Pr2<br />
1<br />
Out1<br />
Q^n<br />
u v<br />
3<br />
2 In2 In3<br />
4<br />
Prt2<br />
In4<br />
Qi1<br />
Prt3<br />
2<br />
Out2<br />
Fig. 2. Block-scheme for solving Equation (3) (Subsystem in Fig.1)<br />
6
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