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GIS-based canopy interception model

A technology of canopy interception and model, applied in the field of GIS-based canopy interception model, can solve the problem that the model is difficult to popularize and apply, and achieve the effect of improving the scope of application and the accuracy of calculation

Inactive Publication Date: 2016-08-31
SICHUAN UNIV
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Problems solved by technology

However, it is precisely because of the limitations of the establishment conditions that it is difficult to popularize and apply the model if it leaves the research area.

Method used

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  • GIS-based canopy interception model
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  • GIS-based canopy interception model

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Embodiment Construction

[0013] The specific implementation of the present invention will be described in conjunction with the examples.

[0014] This embodiment takes the Baisha River Basin as an example: the Baisha River is a primary tributary on the left bank of the upper reaches of the Minjiang River, originating from Chaping Mountain at the junction of Dujiangyan City and Wenchuan. The geographical location is between 103°34′~103°43′ east longitude and 31°01′~31°22′ north latitude, and the control station is the downstream Yangliuping hydrological station. According to the spatial data obtained by GIS, the rain collection area of ​​the study area is 359.4km 2 , the main river is 45.9km long, the average gradient of the river course is 49.3‰, the total length of the river network is 305.5km, and the average elevation of the watershed is 2665.9m. Vegetation is dominated by temperate coniferous forest and broad-leaved forest, accounting for 82.6% of the vegetation area in the study area. The soil ...

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Abstract

The invention relates to a canopy interception model, particularly a GIS-based canopy interception model. According to basin reality and in combination with distribution and percentage of different vegetation types extracted through GIS, after weight average, a parameter forest crown closure Sigma, a leaf area index and a branches and leaves wetted water layer thickness hw are obtained. <{EN2}>According to the GIS-based canopy interception model, from the physical process of crown interception, a canopy interception model in heavy rain is established; the number of the parameters is small; GIS technology is combined; nonparametric solve of canopy interception is realized; and application scope and calculating accuracy of the model are improved.

Description

technical field [0001] The invention relates to a canopy interception model, in particular to a GIS-based canopy interception model. Background technique [0002] Some of the raindrops that fall into the forest first fall on the surface of leaves, branches, trunks and other trees, and are absorbed due to the balance of surface tension and gravity, or accumulate at the forks of branches and leaves and are retained. Part of the retained rainwater evaporates directly into the atmosphere, but as the rainfall continues, the amount of retained rain continues to increase. When it reaches a certain amount, the surface tension and gravity lose balance, and part of it is blown from the trees naturally or due to the wind. Some of the rainfall is transferred from the leaves to the stems, or from the branches to the trunk and flows to the forest floor. The former is called the canopy dripping rainfall, and the latter is called the stemflow rainfall. Once the rainfall stops, the retained...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
CPCG16Z99/00Y02A90/10
Inventor 梁煜峰周宏伟周家文弓瑞霍苗王佳美
Owner SICHUAN UNIV
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