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Drip irrigation small district hydraulic design method

A hydraulic design and community technology, applied in the field of agricultural irrigation, can solve problems such as the gap in irrigation quality

Inactive Publication Date: 2014-02-05
NORTHWEST A & F UNIV
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Problems solved by technology

[0003] At present, my country's current "Technical Specifications for Micro-irrigation Engineering" (GB / T50485-2009) only considers the hydraulic deviation in the hydraulic design of the drip irrigation area, and does not take into account the influence of the manufacturing deviation of the emitter. Therefore, the designed drip irrigation There is still a certain gap between the actual irrigation quality of the project and the design target

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  • Drip irrigation small district hydraulic design method

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Embodiment Construction

[0074] The applicant proposed a hydraulic design method for the drip irrigation area. First, he proposed a calculation formula for the flow deviation rate of the drip irrigation system that considered both the hydraulic deviation and the emitter manufacturing deviation; The deviation calculation formula; on this basis, the hydraulic design process of the drip irrigation area is proposed. Specifically include:

[0075] First, the formula for calculating the flow deviation rate of the drip irrigation system considering both the hydraulic deviation and the emitter manufacturing deviation is established:

[0076] q v =(1+0.3u 1 c v )q hv +2u 1 c v (1)

[0077] In the formula: q v It is the comprehensive flow deviation rate of the irrigation area considering the hydraulic deviation and emitter manufacturing deviation at the same time, unit: %;

[0078] u 1 is a random number that obeys a normal distribution with a mean of 0 and a standard deviation of 1;

[0079] c v...

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Abstract

The invention relates to a drip irrigation small district hydraulic design method. The drip irrigation small district hydraulic design method firstly comprises putting forward a drip irrigation system flow deviation rate calculation formula which takes hydraulic deviation and irrigation emitter manufacturing deviation into consideration simultaneously, wherein given a drip irrigation system allowable flow deviation rate, the allowable hydraulic flow deviation rate of the drip irrigation small district can be obtained through back calculation according to the formula, and accordingly the allowable working head deviation of the drip irrigation small district can be determined; establishing working head deviation calculation formula on a single pipe (a capillary pipe or a branch pipe) under slopes of different types, reasonably distributing the allowable working head deviation of the drip irrigation small district on the capillary pipe and the branch pipe, and designing the capillary pipe and the branch pipe. According to the drip irrigation small district hydraulic design method, due to the fact that the irrigation emitter manufacturing deviation is considered, the design results of a drip irrigation project is closer to actual conditions, and the irrigation quality of the drip irrigation system is improved.

Description

technical field [0001] The invention belongs to the technical field of agricultural irrigation, relates to a design method of a drip irrigation project, in particular to a hydraulic design method of a drip irrigation irrigation area. Background technique [0002] The flow deviation rate is one of the important indicators to describe the irrigation quality of the drip irrigation system, and it is also one of the main parameters of the drip irrigation engineering design. In the design of drip irrigation projects, the method of limiting the flow deviation rate is usually used to ensure the uniformity of system irrigation. There are many factors that affect the flow deviation rate, such as the change of the working pressure of the emitter, the blockage of the emitter, the manufacturing deviation of the emitter, the temperature change of the irrigation water, and the change of the ground level. In the design of drip irrigation projects, only by fully considering its influencing ...

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Application Information

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IPC IPC(8): G06F17/50
Inventor 张林吴普特朱德兰范兴科
Owner NORTHWEST A & F UNIV
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