A calculation method of soil profile water utilization based on profile moisture content and groundwater depth

Abstract

The invention discloses a soil profile water utilization calculation method based on profile water content and groundwater burial depth. The main steps are as follows: data preparation and inspection; Calculate the moisture content of the profile; select the calculation area to calculate the soil profile water storage; finally use the difference between the soil profile water storage at the beginning and the end of the calculation period to obtain the soil profile water utilization; at the same time, use the water storage change in the groundwater depth variation zone to calculate The groundwater utilization in the saturated zone is obtained, and the soil water utilization in the unsaturated zone is further reversed to obtain the vertical distribution of water utilization in the soil profile. The invention uses the measured water content data and extends it to the entire calculation section, and calculates the groundwater utilization in the saturated zone and the soil water utilization in the unsaturated zone by segmenting the calculation area, which is the source of distinguishing the water utilization in the soil profile. Data support is provided.

Description

technical field [0001] The invention belongs to the field of water conservancy calculation, relates to the field of soil water and groundwater calculation, and in particular relates to a soil profile water usage calculation method based on profile moisture content and groundwater depth, which is used for profile water usage (soil water usage in arid plain areas) water and groundwater use). Background technique [0002] In recent decades, the global agricultural irrigation area has increased rapidly, and irrigation water accounts for more than half of the total water consumption in most countries, making the contradiction between water supply and demand extremely prominent. In addition, in the arid regions of northwest my country, there is still a structural imbalance of water supply and demand in time, which further aggravates the contradiction between water supply and demand. In spring and summer, when crops require more water, there is less natural inflow of water; while ...

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Problems solved by technology

[0004] (1) Many calculation methods are directly calculated by the product of the water supply degree and the variation of the buried depth, and the value of the water supply degree is difficult to determine

The physical meaning of the water supply degree obtained by the general pumping test is inconsistent with the physical meaning of the water supply degree used in the calculation formula of soil profile water use, and the use of its value to calculate the soil profile water use will lead to underestimation of the results

[0005] (2) The current calculation method of profile water use mainly focuses on the groundwater use in the saturated zone, ignoring the unsaturated soil water use stored in the unsaturated zone

However, the measured data show that the amount of water stored in the soil and used by crops in the growth period is relatively large, which cannot be ignored

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