Evaluation method of unsaturated zone soil water consumption characteristics based on overall process of water circulation

A technology of soil moisture and consumption characteristics, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as deepening, lack of mechanism, and difficulty in comprehensively responding to energy balance and water balance, and achieve general technical methods and easy Promoted app performance

Active Publication Date: 2015-11-04
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology allows for accurate assessments of soil properties such as how much rain falls over an agricultural field during different stages of its development. It provides a way to measure these differences accurately without relying solely upon physical measurements like temperature or humidity levels that may be affected negatively due to factors other than actual conditions at any given time. By combining both environmental variables (temperature) and gusts into one equation, the system predicts future values more precisely compared against previous results from experiments conducted under similar settings. Overall, this innovation helps optimize crop management strategies while optimizing resource utilization efficiency.

Problems solved by technology

This patents describes how long ago studying changes made across geologically significant regions such as agricultural fields have shown limitations with existing techniques like volumetric analysis (VCA) and numerical simulations. Specifically, they either neglect specific factors involved during the dynamics of evaporative processes within unsaturate layers or use simplified mathematical equations derived through partial differential decomposition. Additionally, previous attempts were limited in their ability to accurately evaluate soil water usage patterns in unsaturaced zones without accounting for both the influence of external sources such as wind and rain.

Method used

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  • Evaluation method of unsaturated zone soil water consumption characteristics based on overall process of water circulation
  • Evaluation method of unsaturated zone soil water consumption characteristics based on overall process of water circulation
  • Evaluation method of unsaturated zone soil water consumption characteristics based on overall process of water circulation

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Embodiment 1

[0045] This embodiment is an evaluation method for the water consumption characteristics of unsaturated zone soil, the process is as follows figure 1 shown. In this example, on the basis of establishing a large-scale unsaturated zone soil moisture consumption utility definition method, a quantitative evaluation of unsaturated zone soil moisture consumption characteristics based on water cycle and energy cycle process is realized by constructing a simulation model of unsaturated zone soil moisture cycle method.

[0046] Because in the process of natural water cycle, the soil moisture in the whole unsaturated zone is a process of recharge and discharge at the same time. Its recharge item includes the amount of precipitation that infiltrates into the soil and remains in the unsaturated zone, and the subsurface evaporation item, which can be expressed as the formula:

[0047] S = P input + E Q = W t1 + P – Rg - Rs - I - D - R lr + E Q ,

[0048] Among them, t...

Embodiment 2

[0109] This embodiment is an improvement of the first embodiment, and it is a refinement of the first embodiment on "the determination of the water cycle elements of the soil water subsystem corresponding to different underlying surface conditions in the unsaturated zone". The "determination of the water cycle elements of the soil water subsystem corresponding to different underlying surface conditions in the unsaturated zone" described in this embodiment includes the following sub-steps:

[0110] 1) Determination of the basic calculation unit, based on the DEM analysis of the whole basin and the measured water system vector diagram, the general geographic information system tool divides the water cycle simulation system into multiple sub-basins;

[0111] 2) To determine the evapotranspiration of soil water in the unsaturated zone corresponding to different land uses in the basic calculation unit, the evapotranspiration of different calculation units is determined by area weigh...

Embodiment 3

[0117] This embodiment is an improvement of Embodiment 1, and is a refinement of Embodiment 2 on "flux exchange with surface water and groundwater subsystems". The "flux exchange with surface water and groundwater subsystems" described in this embodiment includes: within one time step, the water circulation simulation system in the calculation unit first completes the surface water circulation process, and the groundwater and soil water subsystems Exchange and calculate the various fluxes of the water cycle in each sub-basin, where the vertical circulation flux related to soil moisture includes precipitation infiltration recharge and surface water seepage recharge from rivers, reservoirs, wetlands, canals, etc., Base flow discharge, and submerged evaporation, etc.:

[0118] (1) There is no calculation unit for lateral soil flow in the plain area

[0119] (4)

[0120] (2) Calculation units for lateral soil flow in hilly areas

[0121] (5)

[0122] In the formula: S ...

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Abstract

The invention relates to an unsaturated zone soil water consumption characteristics based on overall process of water circulation. The method comprises the following steps of: building a dynamic conversion model of an unsaturated zone soil water subsystem; simulating circulation of regional unsaturated zone soil water; performing data assimilation of a hydrological model and a remote sensing retrieval of soil water evapotranspiration; determining an evapotranspiration structure; and performing quantitative evaluation on soil water consumption characteristics. According to the invention, an unsaturated zone soil water dynamic conversion model based on sub-watershed spatial dispersion and coupled with a surface and ground water circulation model is used, and the evaluation method of soil water consumption characteristics provided on the basis of the unsaturated zone soil water dynamic conversion model can realize quantitative simulation of soil water in a large spatial scale watershed or region, and quantitative evaluation on consumption characteristics. The method is combined with consumption characteristics evaluation theory of land utilization, and is beneficial for guiding rational utilization of soil water. The technical method provided by the invention is universal and easy to be popularized and applied.

Description

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Claims

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Application Information

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Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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