Stage and step dynamic control agricultural field drainage design method

Abstract

The present invention relates to the field of agricultural irrigation drainage technology, in the concrete, said invention provides a staged and graded dynamically-controlled farmland drainage designing method. Said method is characterized by that said designing method mainly includes the following several contents: firstly, according to the actual requirements for drainage designing three stages of early stage, mid-stage and late stage for time division; respectively providing groundwater level dynamic control index, using it as designing standard for drainage engineering with different grades, then correspondently defining spaced distance between drainage ditches for making farmland management, collecting water and conveying water, so that said designing method can effectively raise drainage effect of farmland.

Description

Technical field [0001] This invention relates to the field of agricultural irrigation and drainage, and specifically provides a staged and hierarchical dynamic control farmland drainage design method that determines the reasonable specifications of the drainage system according to new design standards. Background technique [0002] Under the existing technology, in northern canal irrigation areas that require the prevention and control of salinization, the critical depth is generally used as the control depth index that should be achieved to design the field drainage engineering, and based on this, determine the depth of the drainage engineering at all levels and the corresponding Spacing specifications. However, because the current standards are not completely realistic, the result is often that the role of field engineering does not achieve the desired effect, and the maintenance and operation of the drainage system are also difficult. Especially in light soil areas, the depth ...

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Problems solved by technology

If the three levels (bucket, branch, and trunk) are calculated downward, and the height difference between each level is calculated as 0.2m, the depth of the main drainage ditch will reach about 3.0m, and the required outflow water level at the main drainage outlet will be lower. In general, artesian drainage is easily blocked

[0021] 2. When the depth of the final fixed ditch (pipe) is large, the calculated spacing is relatively large. Due to various factors, the actual depth is difficult to meet the design requirements, which makes the drainage project control the groundwater level and prevent salinization The effect of the ditch is relatively weakened, often the effect is still obvious near the ditch, and the effect is worse at a little distance, and the middle part of the ditch (pipe) is even worse. The result is that the control effect is extremely unevenly distributed within the control range

[0022] 3. Due to the large depth of drainage ditches at all levels, i

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