Method for constructing artificially natural slope-type terrace land in Three Gorges reservoir area

A technology of the Three Gorges reservoir area and construction method, which is applied in excavation, construction, infrastructure engineering, etc., can solve the problems of large amount of earthwork, low degree of mechanization, fragmented land, etc., and achieves increased soil layer thickness, low cost, and method simple effect

Inactive Publication Date: 2011-09-07
INST OF MOUNTAIN HAZARDS & ENVIRONMENT CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cost of building horizontal terraces at one time is high, and the amount of earth and stone works is large, requiring high-intensity manpower and material resources. However, most of the sloping farmland in the Three Gorges reservoir area is fragmented, with a large slope, and a low degree of mechanization. In the case of cancellation, it is not practical to transform most of the slope farmland into horizontal terraces in a one-size-fits-all manner

Method used

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  • Method for constructing artificially natural slope-type terrace land in Three Gorges reservoir area
  • Method for constructing artificially natural slope-type terrace land in Three Gorges reservoir area
  • Method for constructing artificially natural slope-type terrace land in Three Gorges reservoir area

Examples

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Embodiment 1

[0034] Example 1: Building a ridge on a ridge

[0035] The main function of the ridge is to intercept the runoff generated by the slope precipitation and the sediment carried by the runoff. They are generally relatively low, mostly made by manual tamping and beating. Specific construction method: According to the critical slope length of rill erosion, the ridge spacing L is drawn up, and the ridge spacing L is generally greater than the critical slope length L of rill erosion R, so that rill erosion can occur on the slope between the ridges. In this way, under the action of trace erosion and down-slope erosion of the slope stream, the soil on the upper slope is gradually transported downward. For sand storage, the silt deposits on the part above the ridge, gradually raising the slope, thereby slowing down the slope. Farmers only need to heighten and reinforce the ridge every year or every few years. In this example, taking the 15° sloping farmland in the purple soil area as ...

Embodiment 2

[0036] Embodiment 2: simple civil engineering ridge building

[0037] Along the contour line, in accordance with the principle of taking advantage of large bends and straightening small bends, simple civil engineering is constructed on the slope at a certain distance, the distance is slightly greater than the critical slope length of rill erosion, and then log fences, bamboo rafts, biological frames, Build ridges with civil materials such as fly ash strip columns, concrete hollow cells, and block stones. In this embodiment, the 15° sloping farmland in the purple soil area is taken as an example, the interval distance is set to 6m, and the civil engineering materials are block stones. Firstly, lay out the line at the same height on the slope, clear the foundation of the field sill, and excavate to form a foundation trench with a height of 35cm and a width of about 25cm. Year after year, the slope of the field surface gradually slows down after plowing down the soil or the hydr...

Embodiment 3

[0038] Example 3: Building a ridge with hedgerows

[0039] Plant hedges are to plant perennial shrubs or herbaceous plants densely in lines or strips at certain intervals along the contour line on the slope or on the initial ridge that has been naturally formed on the sloping farmland to form an energy barrier. Water, retaining fence walls, and eroded sediment that reaches its upslope location produce siltation. With the enhancement of the sand-retaining effect of the hedgerow, the soil is continuously blocked near the hedgerow, and the slope gradually slows down, and the slope gradually develops from the steep slope to the gentle slope, and the slope cultivated land finally becomes a gentle slope terrace or a horizontal terrace. The selection of hedgerow varieties is mainly based on native varieties, supplemented by introduction, mainly by economic plant varieties, supplemented by pure ecological benefit varieties. In this embodiment, different hedgerow varieties are configu...

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Abstract

The invention discloses a method for constructing an artificially natural slope-type terrace land in the Three Gorges reservoir area. The method comprises the following steps of: (1) calculating rill erosion critical slope length of a gentle slope by utilizing a rill erosion generation critical value and a tillage erosion theory; and (b) sequentially constructing sand-blocking terrace banks along the slope according to interval positions larger than the rill erosion critical slope length, wherein the bottom surfaces of all the sand-blocking terrace banks extend into soil below an original slope line, the top surfaces of all the sand-blocking terrace banks are higher than the original slope lines, and between every two adjacent sand-blocking terrace banks, the top surface of the next-stage sand-blocking terrace bank and the bottom surface of the last-stage sand-blocking terrace bank are located on the same isohypse line. The sand-blocking terrace banks are ridge-type sand-blocking terrace banks or simple civil-engineering-type sand-blocking terrace banks or plant-fence-type sand-blocking terrace banks. The method has the characteristics of low cost, easiness for popularization, high benefit and the like.

Description

technical field [0001] The invention relates to a method for preventing and controlling soil and water loss in sloping farmland, in particular to a method for controlling soil and water loss in sloping farmland based on the principles of rill erosion critical value, tillage erosion, slope soil erosion-transportation-deposition process and the like. Background technique [0002] The Three Gorges Reservoir area has an important strategic position in my country, especially in terms of social economy, water resource security and ecological barrier in the Yangtze River Basin. The area of ​​the Three Gorges Reservoir area is 59,300 square kilometers, with a population of more than 21 million. The area of ​​cultivated land is 31,000 square kilometers, most of which are slope cultivated land, of which the area of ​​slope greater than 25 degrees accounts for 22% of the total cultivated land area. The purple soil widely distributed in the Three Gorges Reservoir area is bedrock weather...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D17/20
Inventor 鲍玉海贺秀斌唐强朱宏伟郭丰
Owner INST OF MOUNTAIN HAZARDS & ENVIRONMENT CHINESE ACADEMY OF SCI
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