How is the total amount of soil erosion reduction calculated?

The total amount of soil erosion reduction is calculated by subtracting the amount of soil erosion after the measures taken during the construction period of the main project. Specifically, it includes the following three aspects:

1.Reduction of loss during construction: that is, the total loss during the construction period minus the total loss after treatment.

2.Temporary dumping reduces the amount of soil loss: This includes the amount of soil lost from the temporary pile and the amount of loss after treatment.

3.Reduction of loss during the natural recovery period: that is, the total amount of loss during the natural recovery period minus the total amount of loss after treatment.

It should be noted that for the calculation of the temporary soil dump and the natural restoration period, factors such as the specific natural recovery time and the stacking time of the temporary soil also need to be considered, so as to more accurately calculate the total amount of soil erosion reduced.

In addition, analogies and measurement guidelines can also be used in calculating the total amount of soil erosion reduction. Among them, the analogy method is to calculate the soil loss by referring to the soil and water conservation plans of similar projects that have been approved in the development zone or adjacent projects, combined with the opinions of the local water conservancy department, and using the analogy method to obtain the erosion modulus of different functional zones. The calculation guidelines need to select typical plots with different functional zones, measure the soil erosion modulus according to the type of surface disturbance, whether there is a watercoming earthwork excavation surface above, whether there is a watercoming engineering accumulation above, etc., and calculate the soil loss in a refined manner.

In general, the calculation of the total amount of soil erosion reduction needs to take into account a combination of factors and methods in order to obtain more accurate results.

The total amount of soil erosion during the construction period of the main project minus the amount of soil erosion after the measures taken are reduced. Including the reduction of loss during the construction period (= the total amount of loss during the construction period and the total amount of loss after treatment) the reduction of loss during the temporary soil filling and the reduction of loss during the natural recovery period (= the total amount of loss during the natural recovery period and the total loss after treatment). See more answers

1. What are the measures to reduce soil erosion?

1. Measures to reduce soil erosion are as follows:

1) Reduce slope runoff, slow down the runoff velocity, improve soil water absorption capacity and slope impact resistance, and raise the erosion datum as much as possible;

2) Reasonable arrangement of production and life; Adopt engineering measures such as damming and silting and building terraces to reduce soil erosion;

3) Biological measures such as planting trees and grasses are adopted to restore surface vegetation; Rational grazing.

2. Legal basis: Article 39 of the Land Management Law of the People's Republic of China.

The State encourages units and individuals to develop unused land in accordance with the overall land use plan and on the premise of protecting and improving the ecological environment and preventing soil erosion and land desertification; If it is suitable for development as agricultural land, it shall be developed into agricultural land on a priority basis.

The State protects the lawful rights and interests of developers in accordance with law.

2. What are the causes of soil erosion?

1. Soil quality. For example, most of the Loess Plateau in China is geologically loose, rainwater is easy to decompose, and the erosion resistance is very low, resulting in soil erosion in the region;

2. Rainfall. The impact of rainfall on soil erosion is significant. When the rainfall is insufficient, it will affect the growth of vegetation and cause sandstorms. When there is too much rain, the soil erosion is strong due to the increase of runoff scouring force.

3. Vegetation. Vegetation is an important part of the ecological environment, because most of the natural vegetation in China has been destroyed, increasing soil erosion;

4. Topography. The terrain with vertical and horizontal ravines, steep slopes and deep gullies is also the main factor affecting soil erosion.

There are two main ways to calculate the degree of soil erosion:1It is calculated according to the average annual soil erosion per unit area.

This method mainly calculates the average annual soil erosion per unit area, and then calculates the degree of soil erosion according to a certain formula of Ming Width. It is calculated as the degree of soil erosion (%!).

missing) = average annual soil erosion per unit area (t ha) soil loss modulus (t ha) 100%!. missing), where soil loss modulus refers to the amount of soil loss per unit of rainfall, is usually measured and determined according to different types of land and regions. 2.

Calculated according to the intensity of soil erosion. This method is based on the factors such as land use type, slope, slope aspect, coverage, etc., comprehensively considering the influencing factors of soil erosion, calculating the soil erosion intensity index, and then determining the degree of soil erosion according to certain classification standards. It is calculated as follows:

Soil erosion intensity index = (k1 k2 k3 k4 k5) 100, where rotten pei k1 k5 represents different influencing factor coefficients. According to the resulting soil erosion intensity index, the grade of soil erosion degree can be determined according to certain classification criteria. It should be noted that the above two methods need to be investigated and calculated in the field, and evaluated and determined in combination with local land use and climatic conditions.

Summary. Hello, dear, I have found for you: the total amount of soil erosion minus the amount of soil erosion after the measures taken is reduced.

Including the reduction of loss during the construction period (= the total amount of loss during the construction period and the total amount of loss after treatment) the reduction of loss during the temporary soil filling and the reduction of loss during the natural recovery period (= the total amount of loss during the natural recovery period and the total loss after treatment).

In the water conservation plan, how to calculate the total amount of soil erosion and the amount of new soil erosion?

Dear, hello, for your inquiry royal imitation: the total amount of soil erosion minus the amount of soil erosion after the measures taken is reduced. Including: Reduction of loss during the construction period (= total loss during the construction period - total loss of the town after treatment) Reduction of loss by temporary soil dumping Reduction of loss during natural recovery period (= total loss during natural recovery period - total loss after treatment).

Hello dear, I have found the calculation of the new soil erosion for you: w=r*k*s*l*c*p

Estimation model of soil and water flow wax loss.

**The model uses the Soil Erosion Program (USLE) commonly used in the United States

The equation is:

a=r·k·ls·c·p

Where: a - erosion intensity, that is, the loss per unit area (hm2) per unit time (a);

r—erosion factor;

k—soil factor;

ls—terrain factor;

c—biological factors;

p—soil and water conservation factors.

This model was developed by the USDA Agricultural Research Institute after more than 40 years of field observations. Many studies have shown that the model is not only suitable for soil erosion estimation on hillside land and agricultural land, but also for highway and street construction. In 1991, the Fujian Provincial Soil and Water Conservation Experimental Station and the Department of Chemistry of Fujian Provincial Agricultural University combined the basic conditions of climate, soil, topography and vegetation in southeast Fujian Province to calculate and combine the basic parameters of this model.

**Determination of factors.

Erosive force factor r

The r-factor is an indicator of rainfall erosion, and the effects of runways are also included. For areas that are perennially eroded by rainfall, the size of the r-value depends on the average monthly rainfall and the annual rainfall.

The calculation formula is as follows:

where p is the annual rainfall (mm) and pi is the average monthly rainfall (mm).

The average annual precipitation in the project area is 1200mm, and r can be obtained according to the calculation formula.

The soil factor KK factor reflects the sensitivity of soil to erosion. The higher the k-value, the higher the sensitivity and the more susceptible it is to erosion. The size of the k-factor depends on the soil texture (clay, silt, sand and organic matter content).

The empirical equation for the value of soil erodibility factor k in Fujian Province is as follows

k (where: x1-fine gravel (3 1mm) content, %;

x2-fine sand (content, %;

x3-coarse powder grains (content, %;

x4-fine powder (content, %;

x5 - organic matter content, %;

In the construction area of the project, the soil type is red loam. Based on the analysis of relevant data, the calculation mode of soil erosion soil erosion soil erosion coefficient k in the demonstration area is calculated as fine gravel content x1, fine sand x2 content as 25%, coarse silt content as 20%, fine powder x4 content as 12%, organic matter x5 content as 2%, and the k value is calculated as .

According to the relevant information, the K value of the main soil in the red soil area of Fujian Province is in between, so it is reasonable for the soil in the demonstration area to calculate the K value.

Terrain factor ls

ls is a function of the length of the surface runoff and the slope

ls=(where: s - slope (degrees);

l - slope length (m).

m - slope length index, when sins >5%, m=;

5%,m=；

3%,m=；

Hello dear, according to the situation you described, the calculation of the degree of soil erosion mainly has the following indicators:1Loss area rate:

The ratio of the area lost to the area of the watershed, which represents the ratio of the area of the area lost to the watershed within the watershed, is usually expressed in %. The higher the rate of outrage in the area lost, the more serious the degree of soil erosion. 2.

Average loss thickness: The average thickness of the soil layer per unit area in the loss area, expressed in cm. The greater the average loss thickness, the more severe the loss.

3.Loss intensity: the average amount of loss per unit area per unit time, expressed in t (km2 a).

The greater the intensity of erosion, the more severe the soil erosion. 4.Capacity factor:

The ratio of the actual water storage in the basin to the theoretical water storage, range 0-1. The smaller the capacity coefficient, the lower the water storage capacity of the basin and the more serious the soil erosion. 5.

Soil erosion modulus: the average annual soil loss per unit area of the basin, expressed in t km2. The higher the modulus, the more severe the degree of soil erosion.

In addition to the above main indicators, the reasonable assessment of soil erosion degree can also be carried out through soil erosion classification and erosion vulnerability assessment. In general, the comprehensive evaluation of multiple indicators can more accurately reflect the status of soil erosion.

In the water conservation plan, how to calculate the total amount of soil erosion and the amount of new soil erosion?

**Soil erosion is generally divided into the construction period, the core control period and the natural recovery period. First, determine the background value of the soil erosion modulus of the town, that is, the value before the damage, according to the actual investigation and refer to the local hydrological data. There are many methods to determine the soil erosion modulus after disturbance, such as data method, field investigation, simulation experiment, mathematical model sail grinding, etc.

It can be determined by referring to the classification and grading standards for soil erosion. Finally, the soil erosion modulus is multiplied by the area and time to obtain the amount of soil loss, and the amount of the construction period and the amount of the natural recovery period is the total amount, and the amount of the background value is the amount of new soil loss.