CN106680454A - Method for calculating soil erosion modulus of governed collapse mound with sand-blocking dam - Google Patents

Method for calculating soil erosion modulus of governed collapse mound with sand-blocking dam Download PDF

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Publication number
CN106680454A
CN106680454A CN201510756635.9A CN201510756635A CN106680454A CN 106680454 A CN106680454 A CN 106680454A CN 201510756635 A CN201510756635 A CN 201510756635A CN 106680454 A CN106680454 A CN 106680454A
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China
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area
check dam
silt
soil
transverse
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CN201510756635.9A
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俞慎
许敬华
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Institute of Urban Environment of CAS
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Institute of Urban Environment of CAS
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Priority to CN201510756635.9A priority Critical patent/CN106680454A/en
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Abstract

The invention relates to a method for calculating a soil erosion modulus of a governed collapse mound with sand-blocking dam. The method comprises the following specific processes: dividing a siltation area into a plurality of approximate trapezoids or triangles according to the intercepted cross section of a boundary turning point of the sand-blocking dam siltation area; determining the quantity and the positions of drilling points according to the width of the cross section and measuring the silt siltation depth of the siltation area; calculating the area of each cross section of the sand-blocking dam siltation area through the silt siltation depth; calculating the siltation volume of silt in front of the sand-blocking dam by utilizing the area of each cross section and the distance between the adjacent cross sections; calculating the soil erosion modulus according to the area of a collapse mound erosion area, the average soil volume weight of the silted silt and the silt siltation volume. The method provided by the invention has the benefits that the sand-blocking dam of the governed collapse mound and the sand-blocking dam's function of blocking most of eroded soil are fully utilized, and the soil erosion modulus after the collapse mound is governed is calculated by calculating the silt siltation quantity, so that the soil conservation benefits caused by various government measures for the collapse mount is subjected to in-situ verification.

Description

A kind of tool check dam has administered slope collapse soil erosion modulus measuring method
Technical field
The present invention relates to field is evaluated in water and soil conservation, specifically belong to a kind of tool check dam and administered slope collapse soil erosion modulus measuring method.
Background technology
Collapsed gully erosion is as a kind of serious soil loss pattern, very universal in the deep granite Hills And Low Mountains distribution of south China weathering crust.Through slope collapse improvement for many years and experimental study, sum up the technical method that various slope collapses are administered, but at present slope collapse is administered has every present situation such as engineering is established one's own system, Integration ofTechnology benefit is not highlighted, and lacks the method that Soil erosion situation carries out benefit checking after administering to slope collapse.After research slope collapse different measure is administered, Soil erosion situation is advantageously implemented slope collapse governance model optimum organization, the improvement for promoting slope collapse more efficient.
At present, the conventional Soil erosion measuring method of China mainly has runoff observation on plots method, plugs in pricker method, remote sensing image, 3 D laser scanning etc..Runoff plots method is easy to operate, but its civil engineering facility high cost, needs long-term observation, and which can only explain the size of hydraulic action in collapsed gully erosion, and shortage is considered to gravity part;Plug in pricker method is easy, practicality is high, but erosion pattern of the slope collapse based on avalanche effect can cause loss of data;Remote sensing image method is suitable for the analysis of the erosion condition in large scale, and which receives remote sensing resolution, weather conditions, vegetation coverage etc. to affect larger;Three-dimensional laser scanner high precision, data are complete, but the shortage to administering the slope collapse in one period, due to administering front basic data, it is impossible to the efficiency of soil conservation after assessment improvement, and its expense input is larger.
The content of the invention
In order to solve the above problems, the purpose of the present invention is:A kind of tool check dam has administered slope collapse soil erosion modulus measuring method.
The technical solution adopted in the present invention is:A kind of tool check dam has administered slope collapse soil erosion modulus measuring method, comprises the following steps:
Step 1:Transverse section is intercepted according to check dam alluvial area border turning point alluvial zoning is divided into into some approximate trapezoids or triangle;
Step 2:Determine drill site number, position and measure its silt depth according to transverse section width;
Step 3:By each cross sectional area in silt depth calculation check dam alluvial area;
Step 4:Using each cross sectional area SiAnd between adjacent transverse section apart from LiCalculate Sediment Siltation volume V before check dam;
Step 5:Soil erosion modulus M is calculated according to the area of collapsing erosion area S, the average soil weight σ of silt, alluvial time t and Sediment Siltation volume V.
Further, in the step 1, check dam alluvial area transverse section intercept method is:Choose and intersect and parallel to the transverse section of check dam with the important turning point in check dam alluvial area border so as to silt horizontal plane is divided into into some approximate trapezoids or triangle with the intersection of silt horizontal plane.
Further, drill site number, position are determined on transverse section in the step 2 and the method for silt depth is measured and is:3 to 5 drill sites are chosen uniformly in transverse section upper edge, the concrete number of point is depending on the width of transverse section;Depth is measured using soil drilling apparatus on the point chosen, by discerning whether to determine deposit depth for the soil that deposits to drilling apparatus submerged depth and the soil sample brought up.
Further, in the step 3, Cross Area Computation Method is:The depth data of the width and each point of gained transverse section is imported in AutoCAD and is simulated interpolation, each adjacent end points smooth curve is connected to form plane and calculate each area of plane Si
Further, in the step 4, the computing formula of Sediment Siltation amount is:
Further, the area of collapsing erosion area S, check dam alluvial area area S in the step 5yDetermined using differential GPS;The average soil weight of silt is that about 1 ~ 2 meter of position takes soil profile and determines each edaphic soil weight on section before check dam, asks for its meansigma methods σ;The alluvial time is from check dam the built time to checking minute span.
Further, the soil modulus calculation formula is:
The invention has the beneficial effects as follows:The present invention has check dam this feature according to slope collapse is administered, the average annual soil erosion modulus in corrosion area after slope collapse improvement is estimated by determining check dam silt amount, realize the value of soil erosion modulus is calculated under conditions of long-term observation and model prediction is not needed, administering efficiency of soil conservation to collapsed gully erosion carries out checking in situ.
Description of the drawings
Key step flow charts of the Fig. 1 for the inventive method
Fig. 2 is the area of collapsing erosion, alluvial area and cross-sectional location profile in the present invention
Fig. 3 is Sediment Siltation quantity algorithm three-dimensional simulation figure before check dam in the present invention
Fig. 4 intercepts example for area transverse section of depositing before check dam in the present invention
Have in figure:Check dam 1, slope collapse alluvial area 2, transverse section 3, the area of collapsing erosion 4, drill site 5, trapezoidal or triangle 6.
Specific embodiment
Below in conjunction with drawings and Examples, the present invention is described further.
Referring to figs. 1 to Fig. 4, a kind of tool check dam has administered slope collapse soil erosion modulus measuring method, comprises the following steps:
Step 1:Transverse section is intercepted according to check dam alluvial area border turning point alluvial zoning is divided into into some approximate trapezoids or triangle;
Step 2:Determine drill site number, position and measure its silt depth according to transverse section width;
Step 3:By each cross sectional area in silt depth calculation check dam alluvial area;
Step 4:Using each cross sectional area SiAnd between adjacent transverse section apart from LiCalculate Sediment Siltation volume V before check dam;
Step 5:Soil erosion modulus M is calculated according to the area of collapsing erosion area S, the average soil weight σ of silt, alluvial time t and Sediment Siltation volume V.
In the present invention, in above-mentioned steps 1, check dam alluvial area intercepts transverse section, as shown in figure 4, choose intersecting and parallel to the transverse section of check dam with the important turning point in check dam alluvial area border so as to silt horizontal plane is divided into some approximate trapezoids or triangle with the intersection of silt horizontal plane.
Reconnaissance and its depth survey on transverse section in above-mentioned steps 2, as shown in figure 3, choosing 3 to 5 drill sites on intersection of the transverse section selected with silt horizontal plane, the number of point is depending on the width of transverse section;Depth is measured using soil drilling apparatus on the point chosen, by discerning whether to determine deposit depth for the soil that deposits to drilling apparatus submerged depth and the soil sample brought up.
In above-mentioned steps 3, Cross Area Computation Method is:The depth of transverse section intersection length and each drill site is imported in AutoCAD softwares and is simulated interpolation, each adjacent end points smooth curve is connected to form plane and calculate each area of plane Si
Distance in above-mentioned steps 4 between adjacent transverse section can be by live direct measurement, also the alluvial area boundary point obtained by differential GPS measure and transverse section selected point can be imported in AutoCAD softwares and consecutive points is connected into into line, the figure with cross-sectional location and alluvial area's plane is formed, the distance of two transverse section is determined in AutoCAD softwares.
In above-mentioned steps 4, the computing formula of Sediment Siltation amount is:
In formula, V is Sediment Siltation volume before check dam, Si、Si+1Respectively i-th, the area of i+1 transverse section, Li are the distance between i-th, i+1, two transverse section.
In above-mentioned steps 5, the area of collapsing erosion area is obtained, as shown in Figure 3, continuous sampling site is carried out along collapsed gully erosion area edge by differential GPS and obtains boundary position data, then imported data in AutoCAD softwares, closed sides boundary line is formed by each single-point is connected into line and its area is calculated.
In above-mentioned steps 5, the average soil weight acquisition methods of silt are:Take silt section in check dam alluvial area, silt section is layered and from bottom to up each layer is beaten and take cutting ring, the soil weight of per layer of measure simultaneously asks for the meansigma methodss of the entire profile soil weight.
In above-mentioned steps 5, alluvial Time Calculation method is:The time span of confirmatory experiment measure is built up from check dam.
In above-mentioned steps 5, soil erosion modulus computing formula is:
In formula, M is soil erosion modulus, and V is Sediment Siltation volume before check dam, and σ is the average soil weight of silt, and S is the area of collapsing erosion area, and t is the Sediment Siltation time.

Claims (5)

1. a kind of tool check dam has administered slope collapse soil erosion modulus measuring method, it is characterised in that:Its detailed process is:
Step 1:Transverse section is intercepted according to check dam alluvial area border turning point alluvial zoning is divided into into some approximate trapezoids or triangle;
Step 2:Determine drill site number, position and measure its silt depth according to transverse section width;
Step 3:By each cross sectional area in silt depth calculation check dam alluvial area;
Step 4:Using each cross sectional area SiAnd between adjacent transverse section apart from LiCalculate Sediment Siltation volume V before check dam;
Step 5:Soil erosion modulus M is calculated according to the area of collapsing erosion area S, the average soil weight σ of silt, alluvial time t and Sediment Siltation volume V.
2. a kind of tool check dam according to claim 1 has administered slope collapse soil erosion modulus measuring method, it is characterised in that in above-mentioned steps 1, check dam alluvial area's intercepting sectioning method is:Choose and intersect and parallel to the transverse section of check dam with the important turning point in check dam alluvial area border so as to silt horizontal plane is divided into into some approximate trapezoids or triangle with the intersection of silt horizontal plane.
3. a kind of tool check dam according to claim 1 has administered slope collapse soil erosion modulus measuring method, it is characterised in that in above-mentioned steps 3, Cross Area Computation Method is:3 to 5 points are chosen on transverse section uniformly as depth drill site, the depth of each point is measured using soil drilling apparatus, the data obtained is imported in AutoCAD and is simulated interpolation, each adjacent end points smooth curve is connected to form plane and calculate each area of plane Si
4. a kind of tool check dam according to claim 1 has administered slope collapse soil erosion modulus measuring method, it is characterised in that in above-mentioned steps 4, the computing formula of Sediment Siltation amount is:
In formula, V is Sediment Siltation volume before check dam, Si、Si+1Respectively i-th, the area of i+1 transverse section, Li are the distance between i-th, i+1, two transverse section.
5. a kind of tool check dam according to claim 1 has administered slope collapse soil erosion modulus measuring method, it is characterised in that in above-mentioned steps 5, soil erosion modulus computing formula is:
In formula, M is soil erosion modulus, and V is Sediment Siltation volume before check dam, and σ is the average soil weight of silt, and S is the area of collapsing erosion area, and t is the Sediment Siltation time.
CN201510756635.9A 2015-11-10 2015-11-10 Method for calculating soil erosion modulus of governed collapse mound with sand-blocking dam Pending CN106680454A (en)

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CN108414430A (en) * 2018-03-12 2018-08-17 唐山国丰钢铁有限公司 The measuring method of the relatively corrosive area of salt spray test
CN109425561A (en) * 2017-08-30 2019-03-05 中国科学院城市环境研究所 A kind of slope collapse stability diagnostic techniques of improvement based on the soil profile particle composition that deposits before debris dam
CN109738611A (en) * 2018-12-25 2019-05-10 四川大学 A kind of apparatus and method applied to the measuring and calculating of small watershed erosion modulus

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Cited By (4)

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Publication number Priority date Publication date Assignee Title
CN109425561A (en) * 2017-08-30 2019-03-05 中国科学院城市环境研究所 A kind of slope collapse stability diagnostic techniques of improvement based on the soil profile particle composition that deposits before debris dam
CN109425561B (en) * 2017-08-30 2021-04-13 中国科学院城市环境研究所 Governing collapse stability diagnosis technology based on sediment soil profile particle composition in front of sand-blocking dam
CN108414430A (en) * 2018-03-12 2018-08-17 唐山国丰钢铁有限公司 The measuring method of the relatively corrosive area of salt spray test
CN109738611A (en) * 2018-12-25 2019-05-10 四川大学 A kind of apparatus and method applied to the measuring and calculating of small watershed erosion modulus

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Application publication date: 20170517