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Method for measuring wind resistance to vegetation and the system thereof

A measurement method and measurement system technology, which is applied in the field of vegetation wind resistance, can solve problems such as low accuracy and unsatisfactory simulation results, and achieve the effects of improving accuracy, small error, and reducing measurement error

Active Publication Date: 2010-06-23
SHENZHEN INST OF ADVANCED TECH
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Problems solved by technology

The leaf area density of the vegetation shape parameter has certain advantages, but in the case of obvious wind resistance caused by the trunk, such as deciduous trees, the model that only uses the leaf area density as the shape parameter cannot obtain satisfactory simulation results
In the existing wind resistance measurement of vegetation, part of the leaf area density is used as the plant shape parameter, or the volume ratio of the vegetation is used as the plant shape parameter, or it is simplified as a cylinder group model composed of multiple cuboids. These measurement methods measure Accuracy is not high

Method used

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  • Method for measuring wind resistance to vegetation and the system thereof
  • Method for measuring wind resistance to vegetation and the system thereof
  • Method for measuring wind resistance to vegetation and the system thereof

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Embodiment Construction

[0058] figure 1 Be the flow process of the measurement method of vegetation wind resistance in an embodiment, concrete process is as follows:

[0059] In step S10, a three-dimensional vegetation image is established. In one embodiment, as figure 2 As shown, the process of establishing a 3D image of vegetation is specifically:

[0060] In step S100, the vegetation is photographed from multiple angles by using remote sensing imaging equipment to establish a three-dimensional image of the vegetation. Among them, remote sensing imaging equipment can use lidar and so on. In one embodiment, when shooting vegetation from multiple angles, there should be at least 4 to 8 shooting angles for a single vegetation, so that the three-dimensional fine image of vegetation can be reconstructed more effectively.

[0061] In step S102, each individual vegetation is positioned, and the location coordinates of the vegetation are determined. In one embodiment, a single vegetation can be posit...

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Abstract

The invention provides a method for measuring wind resistance to vegetation and the system thereof. The method comprises the steps that: 3D vegetation images are built, the data of the 3D vegetation images is processed to obtain the vegetation shape parameters; the vegetation shape parameters include the minimum encasing box, leaf area density and trunk equivalent diameter of the vegetation; the vegetation shape parameters are stored in a parameter database; the initial preparations for simulating the wind resistance effects on the vegetation include setting the boundary conditions and initial flow field data for the simulation of the air flow field, dividing the flow field grid, building computational fluid dynamics simulation models including the vegetation wind resistance model based on the vegetation shape parameters and performing the simulation and outputting and displaying the simulation results. The system comprises a remote sensing image acquiring subsystem, a computer unit, and an input and output terminal interacting with the computer modules in real time. The method for measuring wind resistance to vegetation and the system thereof use the vegetation wind resistance models including the vegetation shape parameters and the flow field to simulate and measure the wind resistance to the vegetation, thus increasing the measurement accuracy.

Description

【Technical field】 [0001] The invention relates to the field of wind resistance of vegetation, in particular to a method and system for measuring wind resistance of vegetation. 【Background technique】 [0002] Vegetation wind resistance is the resistance to air movement caused by the presence of vegetation on the ground. When the wind formed by the earth's self-propagation and thermal convection blows through the plants on the ground, a chaotic vortex is formed downstream of the plants, and the area affected by the vortex becomes the wake area. The pressure drop in the wake area makes the pressure on the windward side of the plant higher than that on the leeward side, and this pressure difference is the wind resistance of the vegetation. The greater the wind resistance of vegetation, the greater the impact on plants and the higher the resistance to air movement. [0003] The wind resistance of plants has significant significance in meteorology, environment and other fields. ...

Claims

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Application Information

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IPC IPC(8): G01S17/89G01B11/08G01M10/00
Inventor 邱剑
Owner SHENZHEN INST OF ADVANCED TECH
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