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Evaluation method of soil water consumption characteristics in unsaturated zone based on the whole process of water cycle

A technology for 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 inability to fully provide quantitative evaluation of soil moisture consumption utility characteristics in unsaturated zones, etc. To achieve the effect of general technical methods, easy to popularize and apply

Active Publication Date: 2018-01-16
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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  • Abstract
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  • Application Information

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Problems solved by technology

[0007] In short, the regional soil evapotranspiration model, although the land surface energy balance model, overcomes the lack of understanding of the mechanism of remote sensing direct inversion of evapotranspiration, and gradually reveals the behavior of soil water movement and transformation from the mechanism, especially deepening the understanding of SPAC The understanding of evapotranspiration in the system is mainly based on the energy system and based on the energy balance. It is still difficult to comprehensively reflect the effects of energy balance and water balance, and at the same time, it cannot well reflect the soil under large-scale spatial conditions. Temporal and spatial variability of moisture
In addition, many of the above quantitative models can realize the quantitative evaluation of soil water consumption based on energy balance at different spatial scales, but cannot fully provide a quantitative evaluation of the utility characteristics of soil water consumption in unsaturated zones

Method used

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  • Evaluation method of soil water consumption characteristics in unsaturated zone based on the whole process of water cycle
  • Evaluation method of soil water consumption characteristics in unsaturated zone based on the whole process of water cycle
  • Evaluation method of soil water consumption characteristics in unsaturated zone based on the whole process of water cycle

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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 evaluation method of soil water consumption characteristics in an unsaturated zone, including: constructing a dynamic transformation model of the soil water molecule system in the unsaturated zone; simulating the soil water cycle in the unsaturated zone; combining the hydrological model and remote sensing inversion of soil moisture evaporation and transpiration Data assimilation; determination of evapotranspiration structure; quantitative evaluation of soil water consumption characteristics. The present invention uses the unsaturated zone soil moisture dynamic conversion model based on the sub-basin space discrete coupled surface and groundwater circulation model, and provides a quantitative evaluation method for the consumption characteristics of soil moisture based on this, which can be realized in large-scale watersheds or regions. Quantitative modeling of soil moisture and quantitative assessment of depletion characteristics. Combined with the evaluation theory of land use consumption characteristics, it is helpful to guide the rational use of soil water. The technical method of the invention is universal and easy to popularize and apply.

Description

technical field [0001] The present invention relates to an evaluation method of soil water consumption characteristics in an unsaturated zone, which is an evaluation method of ecological environment resources, and an evaluation method of macroscopic large-scale soil water consumption characteristics supported by the construction of a full-information simulation of the water cycle in an unsaturated zone theoretical approach. Background technique [0002] Traditionally, studies on soil water consumption mainly focus on the soil cultivation layer, and focus on evapotranspiration and deep seepage, which is only an explanation of the consumption quantity, which not only cannot reflect the consumption characteristics of soil water evapotranspiration, but also mainly focuses on At the farmland scale, the dynamic conversion characteristics of soil moisture in the entire unsaturated zone cannot be fully reflected, so that the deep seepage of the soil layer is also considered as a con...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00
Inventor 杨贵羽王浩贾仰文王建华严登华
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES