CN111198253A - Soil moisture characteristic curve expression method and acquisition method thereof - Google Patents
Soil moisture characteristic curve expression method and acquisition method thereof Download PDFInfo
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Abstract
A soil moisture characteristic curve expression method and an acquisition method thereof relate to a characteristic curve expression and an acquisition method thereof. The invention aims to solve the technical problems that the existing expression method of the moisture characteristic curve equation is long in time consumption and expensive in adopted instruments. The method for expressing the soil moisture characteristic curve comprises the following steps: firstly, establishing a soil moisture characteristic curve equation: theta-1-Db/2.65‑Sln h [1]Wherein θ is the volume water content (cm) of the soil3cm‑3) S is the coefficient of the equation, DbIs the volume weight (g cm) of soil‑3) H is soil water suction (cm); secondly, measuring the maximum moisture absorption w of the soilr(ii) a Thirdly, solving S:
fourthly, will equation [2]Substitution equation [1]]And obtaining a soil moisture characteristic curve:
Description
Technical Field
The invention relates to a characteristic curve expression and an acquisition method thereof.
Background
The soil moisture characteristic curve is a relation curve of soil water suction force along with the change of soil moisture content. The method reflects the relation between the energy and the quantity of soil water, is a basic parameter for researching soil water retention and movement, and has important theoretical and practical values. At present, the expression method of the soil moisture characteristic curve comprises a van Genuchten equation, a Brooks-Coren equation and a Garden equation. The water characteristic curve equations are usually obtained by adopting an actual measurement method, namely measuring different water absorption values of soil and corresponding soil water content thereof by methods of a pressure membrane instrument, a high-speed centrifuge, a suction flat instrument and the like, and then fitting the equations by mathematical software. The main disadvantage of this method is that it is time-consuming, often requiring periods varying from one month to several months, depending on the soil type; in addition, the method needs expensive instruments, such as a pressure membrane instrument and a high-speed centrifuge, the price of which is in the range of hundreds of thousands to hundreds of thousands, the suction flat plate instrument is about tens of thousands yuan, and common soil science laboratories can rarely be equipped with the instruments.
Disclosure of Invention
The invention aims to solve the technical problems that the existing expression method of the moisture characteristic curve equation is long in time consumption and expensive in adopted instruments, and provides an expression method of a soil moisture characteristic curve and an acquisition method thereof.
The method for expressing the soil moisture characteristic curve comprises the following steps:
firstly, establishing a soil moisture characteristic curve equation:
θ＝1-Db/2.65-Slnh [1]
wherein θ is the volume water content (cm) of the soil3cm-3) S is the coefficient of the equation, DbIs the volume weight (g cm) of soil-3) H is soil water suction (cm);
secondly, calculating the maximum moisture absorption amount w of the soilr：
In the formula w1Is called vessel mass, w2The mass of the soil after one week of moisture absorption, w3The weight is the weight of the dried material;
thirdly, solving S:
fourthly, substituting the equation [2] and the equation [3] into the equation [1] to obtain a soil moisture characteristic curve:
the method for acquiring the soil moisture characteristic curve comprises the following steps:
firstly, establishing a soil moisture characteristic curve equation:
θ＝1-Db/2.65-Slnh [1]
wherein θ is the volume water content (cm) of the soil3cm-3) S is the coefficient of the equation, DbIs the volume weight (g cm) of soil-3) H is soil water suction (cm);
second measurement of maximum moisture absorption w of soilr：
Sieving the air-dried soil by a 1mm sieve, taking 15 g of the soil, putting the soil into a weighing dish, paving a layer at the bottom of the weighing dish, and recording the mass of the weighing dish as w1Placing the weighed dish on a magnetic plate with a hole in a dryer, wherein the weighed dish is not close to the wall of the dryer, the lower part of the magnetic plate with the hole in the dryer is filled with saturated potassium sulfate solution or sulfuric acid solution with the mass concentration of 10%, 2 ml of sulfuric acid solution or potassium sulfate solution is placed into each gram of soil, the dryer is placed at the temperature of 20 ℃, after the soil absorbs moisture for one week, the weighed dish is taken out of the dryer, and the mass w is rapidly measured2Then putting the weighed dish into a drying oven at 150 ℃ for drying until the weight is constant, and marking as w3；
Calculating the maximum moisture absorption w of the soilr：
In the formula w1Is called vessel mass, w2The mass of the soil after one week of moisture absorption, w3The weight is the weight of the dried material;
thirdly, solving S:
fourthly, substituting the equation [2] and the equation [3] into the equation [1] to obtain a soil moisture characteristic curve:
aiming at the defects of the existing method, the invention provides a new soil moisture characteristic curve expression equation, and simple and cheap experimental equipment is adopted to obtain the parameters of the curve equation in a short time. Not only saves time, but also saves money. Compared with the measured value, the error rate of the soil water content obtained by the method is 0.3755-4.9043%.
Detailed Description
The technical solution of the present invention is not limited to the following specific embodiments, but includes any combination of the specific embodiments.
The first embodiment is as follows: the method for expressing the soil moisture characteristic curve of the embodiment is as follows:
firstly, establishing a soil moisture characteristic curve equation:
θ＝1-Db/2.65-Slnh [1]
wherein θ is the volume water content (cm) of the soil3cm-3) S is the coefficient of the equation, DbIs the volume weight (g cm) of soil-3) H is soil water suction (cm);
secondly, calculating the maximum moisture absorption amount w of the soilr：
In the formula w1Is called vessel mass, w2The mass of the soil after one week of moisture absorption, w3The weight is the weight of the dried material;
thirdly, solving S:
fourthly, substituting the equation [2] and the equation [3] into the equation [1] to obtain a soil moisture characteristic curve:
the second embodiment is as follows: the method for acquiring the soil moisture characteristic curve comprises the following steps:
firstly, establishing a soil moisture characteristic curve equation:
θ＝1-Db/2.65-Slnh [1]
wherein θ is the volume water content (cm) of the soil3cm-3) S is the coefficient of the equation, DbIs the volume weight (g cm) of soil-3) H is soil water suction (cm);
secondly, measuring the maximum moisture absorption w of the soilr：
Sieving the air-dried soil by a 1mm sieve, taking 15 g of the soil, putting the soil into a weighing dish, paving a layer at the bottom of the weighing dish, and recording the mass of the weighing dish as w1Placing the weighed dish on a magnetic plate with a hole in a dryer, wherein the weighed dish is not close to the wall of the dryer, the lower part of the magnetic plate with the hole in the dryer is filled with saturated potassium sulfate solution or sulfuric acid solution with the mass concentration of 10%, 2 ml of sulfuric acid solution or potassium sulfate solution is placed into each gram of soil, the dryer is placed at the temperature of 20 ℃, after the soil absorbs moisture for one week, the weighed dish is taken out of the dryer, and the mass w is rapidly measured2Then putting the weighed dish into a drying oven at 150 ℃ for drying until the weight is constant, and marking as w3；
Calculating the maximum moisture absorption w of the soilr：
In the formula w1Is called vessel mass, w2The mass of the soil after one week of moisture absorption, w3The weight is the weight of the dried material;
thirdly, solving S:
fourthly, substituting the equation [2] and the equation [3] into the equation [1] to obtain a soil moisture characteristic curve:
the following experiments are adopted to verify the effect of the invention:
experiment one:
the method for acquiring the soil moisture characteristic curve comprises the following steps:
firstly, establishing a soil moisture characteristic curve equation:
θ＝1-Db/2.65-Slnh [1]
wherein θ is the volume water content (cm) of the soil3cm-3) S is the coefficient of the equation, DbIs the volume weight (g cm) of soil-3) H is soil water suction (cm);
secondly, measuring the maximum moisture absorption w of the soilr：
Sieving the air-dried sandy soil by a 1mm sieve, taking 15 g, putting into a weighing dish, spreading a layer at the bottom of the weighing dish, weighing the dish with the mass of 10.23g, and recording as w1Placing the weighed dish on a magnetic plate with a hole in a dryer, wherein the lower part of the magnetic plate with the hole in the dryer is not close to the wall of the dryer, the lower part of the magnetic plate with the hole in the dryer is filled with a sulfuric acid solution with the mass concentration of 10%, 2 ml of sulfuric acid solution is placed into each gram of soil, the dryer is placed at the temperature of 20 ℃, after the soil absorbs moisture for one week, the weighed dish is taken out of the dryer, the weighed dish is rapidly measured to have the mass of 25.77g, and the weighed dish is recorded as2Then the weighed dish is put into a drying oven at 150 ℃ to be dried to constant weight, the mass is 25.11g, and is marked as w3；
Calculating the maximum moisture absorption w of the soilr：
In the formula w1Is called vessel mass, w2The mass of the soil after one week of moisture absorption, w3Calculating to obtain w for drying to constant weightr＝0.0434g g-1；
Thirdly, solving S:
fourthly, substituting the equation [2] and the equation [3] into the equation [1] to obtain a soil moisture characteristic curve:
the volume weight of the soil DbIs 1.35g cm-3The maximum moisture absorption capacity of the soil is 0.0434g g-1(ii) a The soil moisture characteristic curve is:
θ＝0.4906-0.054lnh。
the soil water content and the soil test water content comparison table obtained by calculation according to the soil water characteristic curve are shown in table 2, and the instruments and prices adopted in the experiment are shown in table 1:
TABLE 1
Table 2 actual measurement values of soil water content corresponding to different soil water absorption values and soil water content obtained by the method of the invention
The comparison of the data shows that the error rate of the soil water content obtained by the method of the invention is 1.6411-3.9373% compared with the measured value.
Experiment two:
the method for acquiring the soil moisture characteristic curve comprises the following steps:
firstly, establishing a soil moisture characteristic curve equation:
θ＝1-Db/2.65-Slnh [1]
wherein θ is the volume water content (cm) of the soil3cm-3) S is the coefficient of the equation, DbIs the volume weight (g cm) of soil-3) H is soil water suction (cm);
secondly, sieving the air-dried loamy soil by using a 1mm sieve, taking 15 g of loamy soil, putting the loamy soil into a weighing dish, and flatly paving a layer at the bottom of the weighing dish, wherein the weighing dish has the mass of 11.41g and is marked as w1Will callPlacing the dish on a magnetic plate with a hole in a dryer, wherein the lower part of the magnetic plate with the hole in the dryer is not close to the wall of the dryer, the lower part of the magnetic plate with the hole in the dryer is filled with a sulfuric acid solution with the mass concentration of 10%, 2 ml of sulfuric acid solution is placed into each gram of soil, the dryer is placed at the temperature of 20 ℃, after the soil absorbs moisture for one week, the dish is taken out of the dryer, the mass is rapidly measured to be 27.44, and the mark is w2Then the weighed dish is put into an oven at 150 ℃ to be dried to constant weight, the mass is 26.36g and is recorded as w3；
Calculating the maximum moisture absorption w of the soilr：
In the formula w1Is called vessel mass, w2The mass of the soil after one week of moisture absorption, w3For drying to constant weight, wr＝0.0722g g-1；
Thirdly, solving S:
fourthly, substituting the equation [2] and the equation [3] into the equation [1] to obtain a soil moisture characteristic curve:
the volume weight of the soil DbIs 1.35g cm-3The maximum moisture absorption capacity of the soil is 0.0722g g-1(ii) a The soil moisture characteristic curve is:
θ＝0.4906-0.0491lnh。
the comparison table of the soil water content and the soil test water content calculated according to the soil water characteristic curve is shown in table 3, and the instruments and the price adopted in the experiment are shown in table 1.
Table 3 actual measurement values of soil water content corresponding to different soil water absorption values and soil water content obtained by the method of the invention
The comparison of the data shows that the error rate of the soil water content obtained by the method of the invention is 0.3755-4.9043% compared with the measured value.
Claims (2)
1. The soil moisture characteristic curve expression method is characterized by comprising the following steps of:
firstly, establishing a soil moisture characteristic curve equation:
θ＝1-Db/2.65-S ln h [1]
wherein θ is the volume water content (cm) of the soil3cm-3) S is the coefficient of the equation, DbIs the volume weight (g cm) of soil-3) H is soil water suction (cm);
secondly, calculating the maximum moisture absorption amount w of the soilr：
In the formula w1Is called vessel mass, w2The mass of the soil after one week of moisture absorption, w3The weight is the weight of the dried material;
thirdly, solving S:
fourthly, substituting the equation [2] and the equation [3] into the equation [1] to obtain a soil moisture characteristic curve:
2. the method for obtaining a soil moisture characteristic curve according to claim 1, wherein the method for obtaining a soil moisture characteristic curve comprises:
firstly, establishing a soil moisture characteristic curve equation:
θ＝1-Db/2.65-S ln h [1]
wherein θ is the volume water content (cm) of the soil3cm-3) S is the coefficient of the equation, DbIs the volume weight (g cm) of soil-3) H is soil water suction (cm);
secondly, measuring the maximum moisture absorption w of the soilr：
Sieving the air-dried soil by a 1mm sieve, taking 15 g of the soil, putting the soil into a weighing dish, paving a layer at the bottom of the weighing dish, and recording the mass of the weighing dish as w1Placing the weighed dish on a magnetic plate with a hole in a dryer, wherein the weighed dish is not close to the wall of the dryer, the lower part of the magnetic plate with the hole in the dryer is filled with saturated potassium sulfate solution or sulfuric acid solution with the mass concentration of 10%, 2 ml of sulfuric acid solution or potassium sulfate solution is placed into each gram of soil, the dryer is placed at the temperature of 20 ℃, after the soil absorbs moisture for one week, the weighed dish is taken out of the dryer, and the mass w is rapidly measured2Then putting the weighed dish into a drying oven at 150 ℃ for drying until the weight is constant, and marking as w3；
Calculating the maximum moisture absorption w of the soilr：
In the formula w1Is called vessel mass, w2The mass of the soil after one week of moisture absorption, w3The weight is the weight of the dried material;
thirdly, solving S:
fourthly, substituting the equation [2] and the equation [3] into the equation [1] to obtain a soil moisture characteristic curve:
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112034138A (en) * | 2020-08-25 | 2020-12-04 | 塔里木大学 | Calculation method and classification method of soil physical property comprehensive character parameters |
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| CN104198317A (en) * | 2014-09-03 | 2014-12-10 | 塔里木大学 | Method for measuring physical parameter S of soil |
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| CN106706885A (en) * | 2017-01-12 | 2017-05-24 | 江西理工大学 | Calculating method of distribution of volumetric water content around liquid injection hole for in situ leaching of ion type rare earth |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112034138A (en) * | 2020-08-25 | 2020-12-04 | 塔里木大学 | Calculation method and classification method of soil physical property comprehensive character parameters |
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