Ground irrigation control method based on surface water depth information

Abstract

The invention discloses a ground irrigation control method based on surface water depth information, and belongs to the irrigation technology field. The method comprises the steps: measuring surface water depth and water current advancing time of measured points of a front half section of a target field in real time, substituting the surface water depth and water current advancing time into a ground irrigation model, solving a soil infiltration parameter initial value, substituting the soil infiltration parameter initial value into the ground irrigation model, solving a surface water depth analog value of all water measured points prior to predetermined measured points when the water currents of the front half section of the target field advance in the predetermined measured points, and taking the maximum average value of an error between the surface water depth analog value and a corresponding actual measured value as a target function to conduct inverse calculation and optimization on a soil infiltration parameter; and substituting the optimized soil infiltration parameter into the ground irrigation model, predicating a whole ground irrigation process, adjusting the irrigation time based on a predication result, and accurately controlling the ground irrigation process. According to the method provided by the invention, ground irrigation can be accurately controlled, the irrigation quality can be effectively improved, and the field management level can be improved.

Description

technical field [0001] The invention relates to the technical field of irrigation, in particular to a ground irrigation control method based on surface water depth information. Background technique [0002] In the process of farmland irrigation, in order to improve the water quality of surface irrigation and the control and management level of surface irrigation, real-time control of surface irrigation is usually carried out. Under normal circumstances, the following two methods are used to control surface irrigation: one is to rely on empirical data to control the flow rate or irrigation time; the other is to estimate soil infiltration parameters and substitute them into existing irrigation models Real-time water infiltration can be obtained, and based on this, the flow into the border or irrigation time can be controlled, so as to realize the control of surface irrigation. [0003] However, it is known that surface irrigation cannot be accurately controlled by relying on ...

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Problems solved by technology

Since the test method selects multiple test points for experiments, the calculated soil infiltration parameters are difficult to reflect the average infiltration depth of the field surface; the direct method requires a complete observation of the irrigation process, which is time-consuming and laborious, and cannot meet the needs of the irrigation process. Control; the inverse method is mostly based on the water flow advance and subsidence time. However, because the subsidence time needs to be measured after the irrigation is completed, it cannot satisfy the control of the irrigation process.

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