Roof vegetation evapotranspiration measuring method based on thermal imaging technology

A thermal imaging technology and evapotranspiration technology, applied in the field of ecological monitoring, can solve problems such as inapplicability

Active Publication Date: 2017-05-31
PEKING UNIV SHENZHEN GRADUATE SCHOOL
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  • Abstract
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Problems solved by technology

However, the vegetation on urban green roofs is usually h...

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  • Roof vegetation evapotranspiration measuring method based on thermal imaging technology
  • Roof vegetation evapotranspiration measuring method based on thermal imaging technology

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specific Embodiment 1

[0055] see figure 2 , is the infrared remote sensing image of the green roof vegetation whose evapotranspiration is to be calculated in the embodiment of the present invention, and the shooting time is 8:00 a.m.

[0056] Specific steps are as follows:

[0057] 1. Using infrared remote sensing technology, take thermal infrared images directly above the green roof planting area; judge whether it is necessary to separate the soil from the vegetation according to the vegetation coverage f. to be calculated separately. If the vegetation coverage rate f is almost 100%, the evaporation rate E of soil water can be ignored, and the evapotranspiration rate ET of the research area is approximately equal to the vegetation transpiration rate T, and there is no need to separate soil and vegetation; if the vegetation coverage rate f is low, depending on the study area The evapotranspiration rate ET is equal to the sum of the vegetation transpiration rate T and the soil water evaporation r...

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Abstract

The invention provides a roof vegetation evapotranspiration measuring method based on the thermal imaging technology; the method comprises the following steps: obtaining a roof vegetation thermal infrared image, and processing the thermal infrared image so as to obtain a reference vegetation canopy surface temperature value Tp and a vegetation canopy surface temperature value Tc; obtaining meteorology data information of shooting place; calculating the meteorology data information, the reference vegetation canopy surface temperature value Tp and the vegetation canopy surface temperature value Tc so as to obtain a plant transpiration rate T and a soil evaporation rate E; using the plant transpiration rate T and the soil evaporation rate E to obtain a roof vegetation evapotranspiration rate ET, and further obtaining the roof vegetation evapotranspiration Ev. The roof vegetation evapotranspiration measuring method based on the thermal imaging technology can observe irregularly distributed vegetation without being affected by convection and without contacting the vegetation, thus accurately measuring city green roof evapotranspiration.

Description

technical field [0001] The invention relates to the technical field of ecological monitoring, in particular to a method for measuring evapotranspiration of roof vegetation based on thermal imaging technology. Background technique [0002] The urban green area continues to decrease along with the expansion of urbanization, which directly leads to the enhancement of the urban heat island effect and the increase of urban runoff. Green roof vegetation is an effective measure to increase the urban green area, which can effectively alleviate the above problems while being ornamental. In the case of increasingly tight urban space and limited increase in urban green space, green roof vegetation is becoming more and more popular. [0003] The water balance of urban green roof vegetation is a research focus, and the basic balance relationship is "precipitation = soil moisture content increase + runoff + evapotranspiration". Evapotranspiration is an important part of the water balanc...

Claims

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Application Information

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IPC IPC(8): G01J5/00G01J5/60G01N33/00
CPCG01J5/00G01J5/60G01J2005/0077G01J2005/0092G01N33/0098
Inventor 邱国玉李瑞利秦龙君赵云霞
Owner PEKING UNIV SHENZHEN GRADUATE SCHOOL
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