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Hydraulic calculation of changeable irrigation sediment reservoir
DOI: http://dx.doi.org/10.20534/ESR-16-11.12-123-124
Samiev Luqmon Nayimovich, Senior researcher, Department of Hydraulics, Tashkent Institute of Irrigation and Melioration.
E-mail: [email protected] Arifjanov Aybek Muhamedjanovich, Head of the department, Department of Hydraulics, Tashkent Institute of Irrigation and Melioration E-mail: [email protected]
Hydraulic calculation of changeable irrigation sediment reservoir
Abstract: In this article we offer a calculation method for the changes in the river sediment distribution with hydraulic parameters. We also determine for measured and accounting distribution of the sediment by length of the river flow. Keywords: main canal, irrigation sediment reservoir, water, water flow, sediment.
Detection in the water bend to learn theory of effect of compressions and the meaning of experiment researche, done works on this way expecially current during the regullarly action and during the irregularly action illustrated that a few researches.
So many years analysis, experiment and researches in field, theoretical sum up show that, the mainly reason for change of amount of stable compression in current that the changing current of speed. It depends on changes current area. Because of extensible and taper off current in cross avulsion for calculate length current of compres-
sion, we have to know middle speed of current changes. However, now changeable current for compressions length current about explanation of theoretical works undone.
Changeable avulsion sediment reservoir for irregularly action of differential indexing depend on hydraulic process. Action to explain differently. [1; 2; 3 and etc.].
The meaning this task we can solve through this circuitry: I > 0 : h > h .
Picture 1. circuitry of water's In general, irregular action of differential indexing, we can write this: [2; 3; 4; 5; 7 and etc.].
dh dx
i -
Q2
co2C 2R
1 -
aC2R dm gm dx
1
aQ B grn3
(1)
These are:
С - Shezi coefficient; R - Hydraulic radius;
G) - surface of current; B - width stream surface;
Q- use of stream; a - Carioles coefficient.
In the water bed fouling gathering and to learn process of washing, we should find compressions lenght current for division's orders.
Irrigation sediment reservoir and irrigated canals calculate for learning fouling gathering process is very important. Especially, sediment reservoir at put the begin of line. This line, big fouling gathering through lake by the way, through Amudaryo, central Asia and different lakes from Caucasus. To get good result from compressions routine, it depends on choose right sediment reservoir
irregular action in the water bed
measure. The masurment of sediment reservoir size is marked by the level of sediment.
Not enough cleaning the current causes gathering fauling in the channels; in the big speed of water cleaning causes erosen of water bed, keeping little parts in the sediment reservoir interfere reaching mineral fertilizer the irrigated fields. Analyses the literature showed, that sediment of fouling are mainly at the beginning of sediment reservoir it happens because of the changing stream speed dramatically [1; 2; 3; 7 and etc.].
Cross stream changing causes stream spead changing, at the resuld copabality of loud supplying changes. in this short part most of sediment kept. Sediment along this length make difficult control particle sediment as the result of this containing mineral fertilizer sediment will move. That must be shown that sediment reservoirs in channels mainly work in the regime of increasing and decreasing of water. This case causes changing stream speed in the length of sediment reservoirs and at the result stream loud also changes. That's why for the sediment reservoirs which work in not similar regime we can use above mentioned formulas. Because these formulas are
Section 8. Agricultural sciences
used for regular stream. We use this method to calculate division along the stream strength.
To find the length of current for fouling changes kinetics energy, we can do this:
— = -g(PT -p)WTnsina + — pWTn—— dx 2 dx
(2)
There are: p and pT - equally liquid and hard molecule; WT - hard molecule size like to ball;
- in current speed of compression; g - velocity free fall;
sintt - water bed result ofhorizontal corner; n - number of molecule in current.
To find kinetics energy of current draft from molecule kinetics: G = nd (3)
This
в = — mT32 = pTWT
(4)
In this way, we continue researches and find linking between speed of current and speed of draft:
q 7
xt.*,
d,
Use formula (4) and find this:
f- = -g P-pW 2 ^
dx 2 pTWTvT
3 w Кх dtf +-pTWT-2---
4 pTWT&2 dx
(5)
(6)
Q
& — — To be for Q=const, this
dK 3 (рТ -р)К a2 . 3 К d(lna. х =— g——— sina+— х Т
dx
2
PtQ
4
dx
(7)
Doing integral from formula (2) and find this
3g(Pt -P)
Кх = C exP I-
2prQ2
J asinadx >exp(ln$r2) (8)
As the result of integral routine, find C's border provide: x=0;
K = K .
( Л2"
К = К
V® У
exp <! —D f sin aco2dx 1 Q2 i
(9)
As the result, use formulas (3) and (4) for find drafts' length of current we can use these formulas:
S = S„
s \le
V® У
D
exp <--f sin aco2dx
1 Q2 i
D - describe parameter of draft in current:
D =
3g (Pt -P) (d л3
V do J
2Pt
There S0, ©0 - suitable, the beginning middle of fouling in transit and alive surface;
p Ba pT - density to liquids and hard particles; d - diameter of hard molecule.
Good side of offer tasks, that task has current length for draft of distribution, depend on changeable elements of current's hydraulic technician. These give us. the meaning of full process.
We can use this formula for x free length part for draft's divide to calculate. To find this
function we should see current opened water bed not even action.
In some way, we can write water bed length for change: Widen =©0 + 2tgP H■ x (11)
Narrow ax =a0 - 2tgP H ■ x (12)
There P - water bed corner widen or narrow; H - the middle deep of current.
Widen water bed fouling length of current for calculate to divide, put in (11) and (10) and it does integer:
S = SJ^
exp^
D(®3 -Ч3) f| 2Q2tgß H I
(13)
D = 3 P
4 Pt
V do J
. There S0, Ю0 - suitable, the beginning
middle of fouling in transit and alive surface;
p and pT - equally liquid and hard molecule;
g - velocity free fall;
P - water bed horizontal corner;
dt — diameter of current molecule;
d0 — diameter of equal current speed;
H - the middle deep of current.
In Lake's currents hard molecule pi especially, regularly number And it equal 2600.., 2800kg/m 3 put the regularly number:
S =
exp^
D(rn3 -ю03) .1
(14)
(10) References:
rn J - [ 2Q tgp H
Determine this formula (14) in analyst is hard, so we can find about it in next chapter.
As the result of this formula (14), we can find length of current in hydraulic technician parameters.
The meaning of (10) and (14) tasks system we can see 2 decision. Firstly, length of water bed for hydraulic technician elements. Secondly, length of current for draft.
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