CN107991213B - Calculation method for rainfall interception amount of dry branch and fallen leaf layer - Google Patents
Calculation method for rainfall interception amount of dry branch and fallen leaf layer Download PDFInfo
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- CN107991213B CN107991213B CN201711115943.9A CN201711115943A CN107991213B CN 107991213 B CN107991213 B CN 107991213B CN 201711115943 A CN201711115943 A CN 201711115943A CN 107991213 B CN107991213 B CN 107991213B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/02—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by absorbing or adsorbing components of a material and determining change of weight of the adsorbent, e.g. determining moisture content
- G01N5/025—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by absorbing or adsorbing components of a material and determining change of weight of the adsorbent, e.g. determining moisture content for determining moisture content
Abstract
The invention discloses a method for calculating rainfall interception of a dry branch and deciduous leaf layer. The method involves parameters related to rainfall interception including vegetation coverage, aboveground biomass, duration of rainfall, rain intensity, and thickness of the dead-shoot and deciduous leaf layer. The coefficient of the parameter in the calculation formula is determined by manufacturing a soil tank device for simulating the environment of a dry branch and deciduous leaf layer, setting a control experiment and calculating the coefficient of the parameter in the calculation formula. And finally, the calculation formula is verified through experimental data, and the accuracy of the formula is improved. The method has high rationality and accuracy, and meanwhile, the adjusting capacity of the dead branch and fallen leaf layer on the rainfall is identified by establishing the relation between the earth surface dead branch and fallen leaf layer and the rainfall, so that scientific basis is provided for the research on the hydrological mechanism of the dead branch and fallen leaf layer.
Description
Technical Field
The invention belongs to the technical field of hydrology and water resources, and particularly relates to a rainfall interception amount calculation method of a dry branch and deciduous leaf layer under the conditions of different rainfall intensities, different vegetation coverage degrees and different rainfall durations.
Background
In the water circulation process, the withered branches and fallen leaves layer has important influence on the production flow, the capacity of intercepting the rainfall by the withered branches and fallen leaves layer is accurately known, and the method is very important for accurate calculation of the production convergence.
At present, the rainfall interception amount is calculated by mainly adopting a mass difference method for the calculation of the rainfall interception amount of the dry branch and fallen leaf layer, and then the rainfall interception amount is calculated by testing the weight of the dry branch and fallen leaf layer before and after rainfall. The method is complicated to operate, has poor accuracy, and also has sampling errors, weighing errors and the like from a test area.
The calculation method can accurately calculate the rainfall interception amount only by monitoring conventional parameters, thereby providing better support for the research of the hydrological mechanism of the dry branch and fallen leaf layer.
Disclosure of Invention
The invention aims to provide a method for calculating rainfall interception of a dry branch and fallen leaf layer, which is used for identifying the rainfall adjusting capacity of the dry branch and fallen leaf layer by establishing the relation between the surface dry branch and fallen leaf layer and rainfall.
In order to solve the technical problem, the invention provides a method for calculating the rainfall interception amount of a dry branch and deciduous leaf layer, which comprises the following steps:
(1) and (3) providing a rainfall interception amount calculation formula: i ═ k · V · Ba·Rb·Tc·H，
I is rainfall interception amount, V is vegetation coverage, B is aboveground biomass, and R is rainfall intensity; t is the duration of rainfall, and H is the thickness of a dry branch and deciduous leaf layer;
(2) manufacturing an experimental device for simulating a rainfall interception environment of a dry branch and fallen leaf layer;
(3) operating a control experiment;
(4) and determining parameter coefficients in the rainfall interception amount calculation formula through experimental data.
Preferably, the method for calculating the rainfall interception of the dry branch and deciduous leaf layer further comprises the following steps:
(5) the accuracy of the rainfall interception amount calculation formula is verified through experimental data.
In a preferred embodiment, the experimental device for simulating the rainfall interception environment of the dry branch and deciduous leaf layer comprises a groove-shaped container and a rainfall simulation device, the dry branch and deciduous leaf layer, a latex water-resisting layer, a fine sand layer and a soil layer are sequentially arranged in the groove-shaped container from top to bottom, and a water outlet is formed in one side of the groove-shaped container and is located at the position where the latex water-resisting layer converges. According to the experimental device, the trapped rainfall is collected from the water outlet by using the latex water-resisting layer and weighed; the fine sand layer is used for enabling the latex waterproof layer to form a certain gradient, so that rainwater can be conveniently collected; the delivery port sets up the position that converges at the latex water barrier, the collection of the rainwater of further being convenient for.
In a preferred embodiment, the control variables of the control experiment are the rainfall intensity, the rainfall duration and the above-ground biomass in the rainfall interception amount calculation formula. More preferably, four sets of experiments are provided for each control variable.
The calculation method provided by the invention adopts a method combining a calculation formula and experimental verification, and is suitable for the condition that the rainfall is greater than the interception amount in the rainfall process.
As described above, according to the calculation method of rainfall interception at the dry-branch and deciduous leaf layer of the present invention, after a theoretical calculation formula is proposed, coefficients of parameters required by the calculation formula are determined through experiments, and finally, a reasonable and feasible calculation method is obtained. The method involves parameters related to rainfall interception including vegetation coverage, aboveground biomass, duration of rainfall, rain intensity, and thickness of the dead-shoot and deciduous leaf layer. The coefficient of the parameter in the calculation formula is determined by manufacturing a soil tank device for simulating the environment of a dry branch and deciduous leaf layer, setting a control experiment and calculating the coefficient of the parameter in the calculation formula. And finally, the calculation formula is verified through experimental data, and the accuracy of the formula is improved. The method has high rationality and accuracy, and meanwhile, the adjusting capacity of the dead branch and fallen leaf layer on the rainfall is identified by establishing the relation between the earth surface dead branch and fallen leaf layer and the rainfall, so that scientific basis is provided for the research on the hydrological mechanism of the dead branch and fallen leaf layer.
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In order that the above objects, features and advantages of the present invention will become more apparent, some exemplary embodiments thereof will be described more fully hereinafter with reference to the accompanying drawings; this invention may, however, be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, the drawings illustrate some example embodiments of the invention, together with the description, and serve to explain the principles and aspects of the invention.
Fig. 1 is a schematic flow chart of a method for calculating rainfall interception at a dry branch and deciduous leaf layer according to the present invention.
Fig. 2 is a schematic structural diagram of an experimental apparatus for implementing a method for calculating a rainfall interception amount of a dry branch and deciduous leaf layer according to the present invention.
Detailed Description
In the following detailed description, certain exemplary embodiments of the present invention are shown and described, simply by way of illustration. As those skilled in the art will recognize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.
Fig. 1 is a schematic flow chart of a method for calculating rainfall interception at a dry branch and deciduous leaf layer according to the present invention.
As shown in fig. 1, a method for calculating rainfall interception at a dry branch and deciduous leaf layer comprises the steps of:
(1) and (3) providing a rainfall interception amount calculation formula: i ═ k · V · Ba·Rb·Tc·H，
I is rainfall interception amount, V is vegetation coverage, B is aboveground biomass, and R is rainfall intensity; t is the duration of rainfall, and H is the thickness of a dry branch and deciduous leaf layer;
(2) manufacturing an experimental device for simulating a rainfall interception environment of a dry branch and fallen leaf layer;
(3) operating a control experiment;
(4) and determining parameter coefficients in the rainfall interception amount calculation formula through experimental data.
Preferably, the method for calculating the rainfall interception of the dry branch and deciduous leaf layer further comprises the following steps:
(5) the accuracy of the rainfall interception amount calculation formula is verified through experimental data.
Fig. 2 schematically shows an example of the structure of an experimental apparatus for implementing a calculation method of the rainfall interception amount of a dry shoot and deciduous leaf layer of the present invention.
As shown in fig. 2, the experimental apparatus for simulating a rainfall interception environment of a dry shoot and deciduous leaf layer includes a tank type container 1 made of stainless steel and a rainfall simulation apparatus (not shown). From last to setting gradually withered branch deciduous leaf layer 11, latex water barrier 12, fine sand layer 13 and soil horizon 14 down in the cell type container 1, delivery port 15 set up in one side of cell type container 1 is in the position department that latex water barrier 12 converges.
The experimental apparatus according to the present invention collects and weighs the trapped rainfall from the outlet using the latex water barrier 12. The fine sand layer 13 is for letting the latex water barrier form certain slope, makes things convenient for the collection of rainwater. The water outlet 14 is arranged at the position where the latex waterproof layer converges, so that the rainwater can be further conveniently collected. The rainfall simulation device (not shown) may adjust the intensity of rainfall, duration of rainfall, etc.
In a preferred embodiment, the control variables of the control experiment are the rainfall intensity, the rainfall duration and the above-ground biomass in the rainfall interception amount calculation formula. More preferably, four sets of experiments are provided for each control variable. Alternatively, more than four sets of experiments may be set for each control variable.
The calculation method provided by the invention adopts a method combining a calculation formula and experimental verification, and is suitable for the condition that the rainfall is greater than the interception amount in the rainfall process.
As described above, according to the calculation method of rainfall interception at the dry-branch and deciduous leaf layer of the present invention, after a theoretical calculation formula is proposed, coefficients of parameters required by the calculation formula are determined through experiments, and finally, a reasonable and feasible calculation method is obtained. The method involves parameters related to rainfall interception including vegetation coverage, aboveground biomass, duration of rainfall, rain intensity, and thickness of the dead-shoot and deciduous leaf layer. The coefficient of the parameter in the calculation formula is determined by manufacturing a soil tank device for simulating the environment of a dry branch and deciduous leaf layer, setting a control experiment and calculating the coefficient of the parameter in the calculation formula. And finally, the calculation formula is verified through experimental data, and the accuracy of the formula is improved.
The method has higher rationality and accuracy, and simultaneously identifies the adjusting capacity of the dry branch and fallen leaf layer on the rainfall by establishing the relation between the dry branch and fallen leaf layer on the earth surface and the rainfall, thereby providing scientific basis for the research on the hydrological mechanism of the dry branch and fallen leaf layer.
Claims (5)
1. A method for calculating rainfall interception of a dry branch and deciduous leaf layer is characterized by comprising the following steps:
(1) and (3) providing a rainfall interception amount calculation formula: i ═ k · V · Ba·Rb·Tc·H，
I is rainfall interception amount, V is vegetation coverage, B is aboveground biomass, and R is rainfall intensity; t is the duration of rainfall, and H is the thickness of a dry branch and deciduous leaf layer; k. a, b and c are parameter coefficients in a rainfall interception amount calculation formula;
(2) manufacturing an experimental device for simulating a rainfall interception environment of a dry branch and fallen leaf layer;
(3) operating a control experiment;
(4) and determining parameter coefficients in the rainfall interception amount calculation formula through experimental data.
2. The computing method of claim 1, further comprising:
(5) the accuracy of the rainfall interception amount calculation formula is verified through experimental data.
3. The calculation method according to claim 1, wherein the experimental device for simulating the rainfall interception environment of the dry-shoot deciduous leaf layer comprises a tank-shaped container (1) and a rainfall simulation device, the dry-shoot deciduous leaf layer (11), a water-resisting layer (12), a fine sand layer (13) and a soil layer (14) are sequentially arranged in the tank-shaped container (1) from top to bottom, and a water outlet (15) is arranged at one side of the tank-shaped container (1) at a position where the water-resisting layer (12) converges.
4. The method of claim 1, wherein the control variables of the control experiment are rainfall intensity, duration of rainfall and above-ground biomass in the rainfall cutoff calculation formula.
5. The calculation method according to claim 4, wherein four sets of experiments are provided for each control variable.
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| CN109033584B (en) * | 2018-07-12 | 2023-04-18 | 中国水利水电科学研究院 | Slope convergence calculation method considering withered and falling layers |
| CN110553946A (en) * | 2019-08-07 | 2019-12-10 | 中国水利水电科学研究院 | experimental device and method for rapidly measuring rainfall interception rate in field |
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