SU1521388A2 - Method of water distribution in rice irrigation system - Google Patents

Abstract

The invention relates to agriculture, in particular, to irrigated agriculture, and can be used for automated irrigation and water distribution in rice irrigation systems. The aim of the invention is to improve the reliability and quality of water distribution. This object is achieved in that the floor is provided with the buffer overflow gidroavtomatom level tailrace protected from the upstream overflow and loss of the command, and the error ΔQR water supply is determined by the formula ΔQ _P = S ^_P. ΔН _P / ΔТ _I , where S _P is the downstream area, ΔН _P is the distance between the I-m and (I + 1) -m contacts of the signaling device, - ΔТ _I is the down-time of the downstream between the I-m and (I + 1) - m contacts of the detector. 3 il.

Description

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The invention relates to the field of agriculture and can be used for automated irrigation and water distribution in rice irrigation systems.

The purpose of the invention is to increase the reliability and quality of water distribution.

FIG. 1 shows a flow chart of the method implementation; in fig. 2 - a cut through a water outlet in a damper field; in fig. 3 - the same, in the damper rice check.

The system contains a water source 1, the head structure 2, equipped with a microprocessor controller of the flow regulator 3, a distribution channel 4 with water outlets 5, equipped with bottom-end hydraulic automatic machines 6 and hanging rice rice 7. The distribution channel 4 contains blocking structures 8 s 9 level controllers of the upper reach, outlet 1.0 to the damper rice field, consisting of irrigation canals 11 and damping rice checks 12. Water outlets, - inside the damper rice field are equipped with hydraulic automatic machines and 13 combined water distribution, made in the form of spillways 14 with openings 15, which are blocked by the downstream level controllers 16. Outlet 10 is equipped with hydraulics 17 level mixed type (downstream level regulator with overflow protection from overflow and emptying). Before the water outlet 10, a water level detector 18 is installed, connected by a connection line 19 to a flow controller 3.

The method is implemented as follows.

In accordance with the water use plan, water source Q is supplied from water source 1 to distribution channel 4, which is stabilized by flow regulator 3. The water consumption of rice checks 7 is equal to the actual water loss for total evaporation and filtration. In this case, the entire fault in the water supply (if any) is transported down the distribution channel 4. When the water level is before the water outlet 10 is within the limits of Ntah-I ", | water for the total evaporation and filtration in the damping rice paddies 12. At the same time, the discharge outlet 10 receives a flow equal to

,

where g is the actual hydromodule of water consumption, l / s-ha; S - area of damping rice checks 12, ha.

In the last pool of the distribution channel 4 receives water flow

Q, s (),

(2)

n 5

0

where is the planned water consumption module;

S, - the area of rice checks 7, equipped with hydroplanes downstream; Ag is an error in the forecast of the hydromodule for the next time interval of control.

The water supply error is determined by the formula

AQp-Sp Q-Q. (3)

where SP is the water surface area of the last bay of distribution channel 4.

To control the distribution of water, it is sufficient to divide the level interval before water outlet 10 into five zones.

The flow controller 3 periodically polls the water level indicator 18 and determines the AQp Sp-- value. Change

the head installation settings are made when the dispatching service of the irrigation control system is authorized. In the absence of permission, the reserve volume of the distribution channel 4 is triggered and the hydraulic machine 17 of the mixed type switches to the stabilization mode of the upstream. In this case, the correction value of the setpoint AQ of the head structure 2 is determined by the formula

AQ () f-,

Jl

(five)

e Q is the actual flow rate of the water supplied to the outlet 10 when the hydraulic automat 17 is operating along the upper reach;

Q is the predicted water flow that was planned to be supplied to outlet 10;

S is the area of the entire rice system; Si is the area of the rice system, adjustable downstream. Q value is equal to

Si D / - / 0

fr

.

(6)

40

50

55

The flow rate of the head structure 2 may not be changed as long as the reserve capacity of the damper rice checks 12 is triggered. The reserve capacity of the damper rice checks 12 is formed due to a zone of ± 2 cm from the predetermined water level in the check. For a 140-hectare damping field, the reserve capacity is 56,000 meters, and its drawdown time is defined as

t 56000

-KQ-If the error value AQ is positive, the reserve capacity of the distribution channel 4 is filled first. The water level before the outlet 10 then reaches the value, after which the hydraulic automatic machine 17 switches to the upstream control mode. When this occurs, the irrigation canals 11 overflow and the water enters the damping rice checks 12 through weirs ridges 14. The weirs 14 in this case act as proportional dividers, which evenly redistribute excess water. In the case where the reserve tanks of the damper rice paddles 12 are filled with water, the setpoint of the flow controller 3 is changed by the value of AQ.

Claims (1)

Invention Formula The method of water distribution in rice irrigation systems according to ed. St. No. 1155199 characterized in that, in order to increase the reliability and quality of water distribution, the water supply error is determined by the formula AO -S, rde Sp - plosh, ad water surface of the lower pool; A // P is the distance between i and the contacts of the detector; d /. - filling time of the downstream between / and r + 1 contacts of the detector, and the water supply to the damper field is carried out through the downstream hydraulics with the protection of the upper pool from overflow and loss of command. srig cpus