CN109166280B - Early identification method for debris flow in strong earthquake region and application thereof - Google Patents
Early identification method for debris flow in strong earthquake region and application thereof Download PDFInfo
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Abstract
The invention discloses early identification of debris flow in a strong earthquake regionThe method belongs to the technical field of debris flow prevention engineering, and is characterized by comprising the following steps of: a. determining basic parameters of the potential debris flow basin: the method comprises the following steps of (1) obtaining a debris flow full-watershed area A0, a debris flow watershed forming area A, a debris flow watershed forming area shape coefficient F, a debris flow watershed forming area ditch length L and a debris flow watershed forming area ditch bed longitudinal gradient J; b. determining the average width W of the channel of the debris flow basin forming area, the particle diameter D of the particles of the debris flow basin forming area and the amount V of the loose solid source of the debris flow basin0(ii) a c. Calculating a debris flow basin source coefficient V; d. calculating a debris flow basin identification index S; e. and judging whether the river basin is a debris flow basin. According to the method, the influence of the loose solid matter source quantity of the debris flow on the debris flow formation is researched, a quantitative debris flow basin source quantity judgment index is provided, and the early identification accuracy of the debris flow is greatly improved.
Description
Technical Field
The invention relates to the technical field of debris flow prevention and control engineering, in particular to an early identification method for debris flow in a strong earthquake region and application thereof.
Background
Debris flow is a natural disaster that occurs in mountainous areas. After the debris flow occurs, the debris flow carries a large amount of silt, and the debris flow destroys towns, damages farmlands and forests, destroys bridge roads and blocks traffic. After the strong earthquake, a large amount of landslides and collapses are induced in a strong influence area of the earthquake, and a large amount of solid sources are provided for later-stage debris flow. Domestic and foreign researches show that in the strong earthquake affected area, a plurality of debris flows are often generated in the rainfall process after the earthquake, and sometimes the debris flows are mass-produced; the basin which is not the debris flow gully originally is likely to evolve into the debris flow basin under the influence of strong earthquake; originally, the basin of debris flow gully is probably to evolve into the high frequency debris flow basin under the influence of strong earthquake, and the size that the debris flow takes place can be bigger simultaneously. Since there are basins prior to an intense earthquake that are not yet debris flow gutters, there is no early indication of debris flow, and there are few sources of loose solids in the basins, and thus they are defined as flood basins. However, after a strong earthquake, landslide and collapse and potential landslide and collapse may occur in the watershed, so that the watershed where flood is likely to occur only originally has the source condition for generating debris flow. However, whether the debris flow basin is developed or not needs to be determined by a precise method. Only if the debris flow basin is determined exactly, namely the debris flow basin is identified early, the danger can be determined, and corresponding assessment, early warning and treatment are carried out. At present, no accurate quantification method is available in scientific research to determine an early identification method of the debris flow, and particularly, the early identification method of the debris flow in the earthquake-intensive region under the condition that no early-stage debris flow has signs and the like. The general debris flow early identification is usually to determine whether debris flow occurs in the early stage through field investigation, judge whether debris flow occurs according to sediments on a stacking fan, visit and investigate whether debris flow occurs recently, and investigate whether more loose solid matter sources exist in a debris flow forming area. The debris flow investigation is mainly qualitative investigation, and the condition is the debris flow basin, namely, debris flow can occur under the condition of heavy rainfall.
For a basin without early debris flow, loose solid sources are very few and are determined as a basin of a flood ditch, the conditions of the solid sources of the basin are greatly changed under the influence of a strong earthquake, and whether the basin is a debris flow basin or not cannot be determined by an original qualitative method.
Chinese patent document CN 104318058A, published as 2015, 01, 28 discloses a debris flow early warning method based on rainfall monitoring, which is characterized by comprising the following steps: establishing a debris flow event characteristic rainfall model, a surface runoff event characteristic rainfall model and a normal rainfall event characteristic rainfall model according to historical rainfall data, and determining a discrimination function; determining an attenuation coefficient, a weight coefficient and a critical threshold according to the discrimination function; collecting rainfall data of the first n days, and introducing an attenuation coefficient to calculate the effective rainfall of the first n days; introducing a weight coefficient and current-day rainfall data, and calculating characteristic rainfall according to the weight coefficient, the current-day rainfall data and the previous n-day effective rainfall; and comparing the characteristic rainfall with the critical threshold value, and determining whether the rainfall on the day can cause a debris flow event or not according to the comparison result. According to the debris flow early warning method based on rainfall monitoring disclosed by the patent document, a corresponding model is established through historical rainfall data, a corresponding critical threshold value is calculated, whether a debris flow event can be caused is judged only through a single rainfall characteristic, and early identification accuracy of the debris flow is low.
Disclosure of Invention
The invention provides the method for early identifying the debris flow in the strong earthquake region and the application thereof in order to overcome the defects of the prior art.
The invention is realized by the following technical scheme:
an early identification method for debris flow in a strong earthquake region is characterized by comprising the following steps:
a. determining basic parameters of potential debris flow basins through Google Earth or topographic maps: the method comprises the following steps of (1) obtaining a debris flow full-watershed area A0, a debris flow watershed forming area A, a debris flow watershed forming area shape coefficient F, a debris flow watershed forming area ditch length L and a debris flow watershed forming area ditch bed longitudinal gradient J;
b. determining the average width W of a channel in a debris flow basin forming area, the particle size D of particles in the debris flow basin forming area and the amount V of loose solid source in the debris flow basin by field investigation0；
c. Calculating a debris flow basin source coefficient V by using the formula 1;
V＝V0/A0 formula 1
Wherein V is the debris flow basin source coefficient in the unit m; v0The amount of the loose solid matter source in the debris flow basin refers to the loose solid matter source directly accumulated in the channel of the forming area and has the unit m3A0 is the total flow area of debris flow in m2；
d. Calculating a debris flow basin identification index S by using a formula 2;
S＝T0.2/G0.38formula 2
Wherein S is a debris flow basin identification index; t is a debris flow basin topographic factor and is calculated by the formula 3; g is a geological factor of the debris flow basin and is calculated by the formula 4;
T＝FJ(A/W2)0.2＝JA/L2(A/W2)0.2formula 3
Wherein T is a debris flow basin topographic factor; f is the shape coefficient of the debris flow basin forming area; l isForming a region ditch for the debris flow basin with the length of m; j is the longitudinal gradient of the gully bed in the debris flow basin forming area; a is the area of the debris flow basin forming area and the unit m2(ii) a W is the average width of the channel in the debris flow basin forming area, and the unit is m;
G＝D/D0formula 4
Wherein G is a geological factor of the debris flow basin; d is the particle size of particles in a debris flow basin forming area, which is the average particle medium diameter particle size of the surface of loose solid substances in the forming area and is unit mm; d0Is the minimum particle diameter of coarse particles, D0＝2mm；
e. Judging whether the river basin is a debris flow basin or not;
when V is less than 0.001m, the watershed is a flood watershed and a non-debris watershed;
when V is more than or equal to 0.001m and S is less than 0.05, the watershed is a flood watershed and a non-debris watershed;
when V is more than or equal to 0.001m and S is more than or equal to 0.05, the watershed is a debris flow watershed.
When the debris flow basin is provided with a main ditch and more than 1 branch ditch, the maximum V value and the maximum S value are used as judgment indexes.
The method is suitable for early identification of the single-trench debris flow in the strong earthquake influence area under short-term and long-term earthquake influence time.
The debris flow field forming area refers to an area where debris flow flows through and an area above a debris flow accumulation fan.
The basic principle of the invention is as follows:
the formation of debris flow in the heavy earthquake areas is caused by the rainfall induced torrential floods scouring the loose solid matter in the debris flow forming areas, which solid matter is initiated to form the debris flow. If the loose solid matter is too little, and the mountain torrents wash the loose solid matter, the solid matter can not be started to form a debris flow, and at most, the high sand flood. If the debris flow basin identification index is too small, the sand carrying capacity of the torrential flood is insufficient, and solid substances in the channel of the formation area cannot be started.
The reason why the debris flow basin identification index is too small is as follows:
the debris flow basin terrain factor T is too small:
1) if the area A of the debris flow basin forming area is too small, the amount of catchment is too small, and torrential flood starting solid substances with sufficient flow cannot be formed;
2) the longitudinal gradient J of the gully bed in the debris flow basin forming area is too small, so that solid matters are more difficult to start;
3) the shape coefficient F of the debris flow basin forming area is too small to converge to form a larger torrential flood, and solid substances are not sufficiently started;
4) the average width W of the channels in the debris flow basin forming area is too large, so that the water flow of the torrential flood in the forming area is dispersed, the sand carrying capacity is reduced, and debris flow cannot be formed.
The geologic factor G of the debris flow basin is too large: the particle size D of the particles in the debris flow basin forming area is too large, and solid matters are difficult to start in mountain torrents.
The beneficial effects of the invention are mainly shown in the following aspects:
1. the invention' a, determines the basic parameters of the potential debris flow basin through the Google earth or the topographic map: the method comprises the following steps of (1) obtaining a debris flow full-watershed area A0, a debris flow watershed forming area A, a debris flow watershed forming area shape coefficient F, a debris flow watershed forming area ditch length L and a debris flow watershed forming area ditch bed longitudinal gradient J; b. determining the average width W of a channel in a debris flow basin forming area, the particle size D of particles in the debris flow basin forming area and the amount V of loose solid source in the debris flow basin by field investigation0(ii) a c. Calculating a debris flow basin source coefficient V by using the formula 1; d. calculating a debris flow basin identification index S by using a formula 2; e. judging whether the river basin is a debris flow basin or not; when V is less than 0.001m, the watershed is a flood watershed and a non-debris watershed; when V is more than or equal to 0.001m and S is less than 0.05, the watershed is a flood watershed and a non-debris watershed; when V is larger than or equal to 0.001m and S is larger than or equal to 0.05, the watershed is a debris flow watershed, and compared with the prior art, the method has the advantages that the influence of the loose solid source quantity of the debris flow on the debris flow is researched, the quantitative debris flow watershed source quantity judgment index is provided, and the early identification accuracy of the debris flow is greatly improved.
2. According to the invention, a quantitative debris flow basin identification index judgment value is provided by researching the influence of the identification index of the debris flow on the formation of the debris flow; and a fine calculation index is given, particularly the particle size of loose solid matters, so that the early identification of the debris flow is more accurate.
3. According to the invention, by researching the influence of the identification index of the debris flow on the debris flow formation, a fine calculation index is given, especially the width of the gully bed in the debris flow formation area, and the early identification accuracy of the debris flow is further improved.
4. According to the invention, the influence of the identification index of the debris flow on the debris flow formation is researched, the fine calculation index is provided, and the longitudinal gradient of the gully bed in the debris flow basin formation area, the shape coefficient of the debris flow basin formation area and the area of the debris flow basin formation area are also quantified, so that the early identification of the debris flow is more accurate.
Detailed Description
Example 1
An early identification method for debris flow in a strong earthquake region comprises the following steps:
a. determining basic parameters of potential debris flow basins through Google Earth or topographic maps: the method comprises the following steps of (1) obtaining a debris flow full-watershed area A0, a debris flow watershed forming area A, a debris flow watershed forming area shape coefficient F, a debris flow watershed forming area ditch length L and a debris flow watershed forming area ditch bed longitudinal gradient J;
b. determining the average width W of a channel in a debris flow basin forming area, the particle size D of particles in the debris flow basin forming area and the amount V of loose solid source in the debris flow basin by field investigation0；
c. Calculating a debris flow basin source coefficient V by using the formula 1;
V＝V0/A0 formula 1
Wherein V is the debris flow basin source coefficient in the unit m; v0The amount of the loose solid matter source in the debris flow basin refers to the loose solid matter source directly accumulated in the channel of the forming area and has the unit m3A0 is the total flow area of debris flow in m2；
d. Calculating a debris flow basin identification index S by using a formula 2;
S＝T0.2/G0.38formula 2
Wherein S is a debris flow basin identification index; t is a debris flow basin topographic factor and is calculated by the formula 3; g is a geological factor of the debris flow basin and is calculated by the formula 4;
T＝FJ(A/W2)0.2＝JA/L2(A/W2)0.2formula 3
Wherein T is a debris flow basin topographic factor; f is the shape coefficient of the debris flow basin forming area; l is the channel length of the debris flow basin forming area in the unit of m; j is the longitudinal gradient of the gully bed in the debris flow basin forming area; a is the area of the debris flow basin forming area and the unit m2(ii) a W is the average width of the channel in the debris flow basin forming area, and the unit is m;
G＝D/D0formula 4
Wherein G is a geological factor of the debris flow basin; d is the particle size of particles in a debris flow basin forming area, which is the average particle medium diameter particle size of the surface of loose solid substances in the forming area and is unit mm; d0Is the minimum particle diameter of coarse particles, D0＝2mm；
e. Judging whether the river basin is a debris flow basin or not;
when V is less than 0.001m, the watershed is a flood watershed and a non-debris watershed;
when V is more than or equal to 0.001m and S is less than 0.05, the watershed is a flood watershed and a non-debris watershed;
when V is more than or equal to 0.001m and S is more than or equal to 0.05, the watershed is a debris flow watershed.
"a, determining basic parameters of a potential debris flow basin through Google Earth or topographic maps: the method comprises the following steps of (1) obtaining a debris flow full-watershed area A0, a debris flow watershed forming area A, a debris flow watershed forming area shape coefficient F, a debris flow watershed forming area ditch length L and a debris flow watershed forming area ditch bed longitudinal gradient J; b. determining the average width W of a channel in a debris flow basin forming area, the particle size D of particles in the debris flow basin forming area and the amount V of loose solid source in the debris flow basin by field investigation0(ii) a c. Calculating a debris flow basin source coefficient V by using the formula 1; d. calculating a debris flow basin identification index S by using a formula 2; e. judging whether the river basin is a debris flow basin or not; when V is less than 0.001m, the watershed is a flood watershed and a non-debris watershed; when V is more than or equal to 0.001m and S is less than 0.05, the watershed is a flood watershed and a non-debris watershed; when V is more than or equal to 0.001m andwhen S is more than or equal to 0.05, the basin is a debris flow basin, and compared with the prior art, the method has the advantages that the influence of the loose solid matter source quantity of the debris flow on the debris flow is researched, the quantitative debris flow basin source quantity judgment index is provided, and the early identification accuracy of the debris flow is greatly improved.
Example 2
An early identification method for debris flow in a strong earthquake region comprises the following steps:
a. determining basic parameters of potential debris flow basins through Google Earth or topographic maps: the method comprises the following steps of (1) obtaining a debris flow full-watershed area A0, a debris flow watershed forming area A, a debris flow watershed forming area shape coefficient F, a debris flow watershed forming area ditch length L and a debris flow watershed forming area ditch bed longitudinal gradient J;
b. determining the average width W of a channel in a debris flow basin forming area, the particle size D of particles in the debris flow basin forming area and the amount V of loose solid source in the debris flow basin by field investigation0；
c. Calculating a debris flow basin source coefficient V by using the formula 1;
V＝V0/A0 formula 1
Wherein V is the debris flow basin source coefficient in the unit m; v0The amount of the loose solid matter source in the debris flow basin refers to the loose solid matter source directly accumulated in the channel of the forming area and has the unit m3A0 is the total flow area of debris flow in m2；
d. Calculating a debris flow basin identification index S by using a formula 2;
S＝T0.2/G0.38formula 2
Wherein S is a debris flow basin identification index; t is a debris flow basin topographic factor and is calculated by the formula 3; g is a geological factor of the debris flow basin and is calculated by the formula 4;
T＝FJ(A/W2)0.2＝JA/L2(A/W2)0.2formula 3
Wherein T is a debris flow basin topographic factor; f is the shape coefficient of the debris flow basin forming area; l is the channel length of the debris flow basin forming area in the unit of m; j is a debris flow basin forming area ditchThe longitudinal gradient of the bed; a is the area of the debris flow basin forming area and the unit m2(ii) a W is the average width of the channel in the debris flow basin forming area, and the unit is m;
G＝D/D0formula 4
Wherein G is a geological factor of the debris flow basin; d is the particle size of particles in a debris flow basin forming area, which is the average particle medium diameter particle size of the surface of loose solid substances in the forming area and is unit mm; d0Is the minimum particle diameter of coarse particles, D0＝2mm；
e. Judging whether the river basin is a debris flow basin or not;
when V is less than 0.001m, the watershed is a flood watershed and a non-debris watershed;
when V is more than or equal to 0.001m and S is less than 0.05, the watershed is a flood watershed and a non-debris watershed;
when V is more than or equal to 0.001m and S is more than or equal to 0.05, the watershed is a debris flow watershed.
When the debris flow basin is provided with a main ditch and more than 1 branch ditch, the maximum V value and the maximum S value are used as judgment indexes.
The method is suitable for early identification of the single-trench debris flow in the strong earthquake influence area under short-term and long-term earthquake influence time.
The influence of the identification index of the debris flow on the formation of the debris flow is researched, and a quantitative debris flow basin identification index judgment value is provided; and a fine calculation index is given, particularly the particle size of loose solid matters, so that the early identification of the debris flow is more accurate.
Through researching the influence of the identification index of the debris flow on the debris flow formation, a fine calculation index is given, particularly the width of a gully bed in a debris flow formation area, and the early identification accuracy of the debris flow is further improved.
The influence of the identification index of the debris flow on the debris flow formation is researched, a fine calculation index is given, and the longitudinal gradient of a gully bed in the debris flow basin formation area, the shape coefficient of the debris flow basin formation area and the area of the debris flow basin formation area are also quantified, so that the early identification of the debris flow is more accurate.
The following describes embodiments of the present invention in detail with reference to specific examples:
the Luzhong strong earthquake affected area's the Xianchu of Wenchuan to the Wenchuan county section in 2008 is the Wenchuan earthquake strong affected area, and before the Wenchuan earthquake takes place, this region had once had the mud-rock flow taken place, and the mud-rock flow takes place for single ditch only generally, and the frequency is lower. On 13 days in 2010 and 10 days in 2013 and 7 months, the area is subjected to strong rainfall, and mass-produced debris flow occurs twice. The area with rainfall data is provided with 6 debris flow basins, and 8 debris flows are generated in the two debris flow mass sending processes. The formula of the invention is adopted to carry out early identification and judgment on the 6 debris flow ditches.
Firstly, measuring the debris flow basin forming area A, the shape coefficient F of the debris flow basin forming area, the debris flow basin forming area ditch length L and the longitudinal gradient J of the debris flow basin forming area ditch bed of each debris flow basin through a topographic map; determining the average width W of a channel in a debris flow basin forming area, the particle size D of particles in the debris flow basin forming area and the amount V of loose solid sources in the debris flow basin by field investigation0(ii) a Calculating to obtain a debris flow basin source coefficient V by the formula 1; calculating by formula 3 to obtain a debris flow basin terrain factor T; calculating by formula 4 to obtain a geological factor G of the debris flow basin; and then calculating by the formula 2 to obtain the debris flow basin identification index S.
Parameters of the 6 debris flow ditches after Wenchuan earthquake and early identification and judgment indexes of debris flow basin source coefficients V, debris flow basin identification indexes S and actual occurrence conditions of debris flow are shown in a table 1; table 1 shows the landform, geology, source coefficient, and early stage identification and determination values of debris flow after the venture earthquake. Table 2 shows the landform, geology, source coefficient, and early stage identification values of debris flow before the wenchuan earthquake.
| Name of ditch | A(m2) | F | J | D(mm) | W(m) | T | G | S | V0(m3) | V(m) | Early identification |
| Small Maxi ditch | 1650000 | 0.661 | 0.506 | 200 | 12 | 2.17 | 100 | 0.203 | 455000 | 0.276 | Is that |
| Lotus flower heart groove | 7680000 | 0.307 | 0.318 | 50 | 5.5 | 1.19 | 25 | 0.304 | 1060000 | 0.138 | Is that |
| Silver factory ditch | 5020000 | 0.359 | 0.455 | 350 | 20 | 1.07 | 175 | 0.143 | 1520000 | 0.303 | Is that |
| Big sulcus | 14500000 | 0.488 | 0.393 | 250 | 20 | 1.56 | 125 | 0.175 | 4270000 | 0.294 | Is that |
| Grinder groove | 3170000 | 0.445 | 0.412 | 225 | 18 | 1.15 | 112.5 | 0.171 | 1330000 | 0.420 | Is that |
| Taiping ditch | 14200000 | 0.452 | 0.298 | 300 | 6 | 1.77 | 150 | 0.167 | 2890000 | 0.2035 | Is that |
TABLE 1
| Name of ditch | A(m2) | F | J | D(mm) | W(m) | T | G | S | V0(m3) | V(m) | Early identification |
| Small Maxi ditch | 1650000 | 0.661 | 0.506 | 1000 | 22 | 1.7 | 500 | 0.105 | 80000 | 0.04848 | Is that |
| Lotus flower heart groove | 7680000 | 0.307 | 0.318 | 1000 | 16 | 0.77 | 500 | 0.089 | 6000 | 0.00078 | Whether or not |
| Silver factory ditch | 5020000 | 0.359 | 0.455 | 1000 | 29 | 0.93 | 500 | 0.093 | 3500 | 0.0007 | Whether or not |
| Big sulcus | 14500000 | 0.488 | 0.393 | 1000 | 33 | 1.28 | 500 | 0.099 | 12000 | 0.00083 | Whether or not |
| Grinder groove | 3170000 | 0.445 | 0.412 | 1000 | 30 | 0.94 | 500 | 0.093 | 20000 | 0.00631 | Is that |
| Taiping ditch | 14200000 | 0.452 | 0.298 | 1000 | 18 | 1.14 | 500 | 0.097 | 10000 | 0.0007 | Whether or not |
TABLE 2
Early recognition and judgment standards of debris flow:
when V is less than 0.001m, the watershed is a flood watershed and a non-debris watershed;
when V is more than or equal to 0.001m and S is less than 0.05, the watershed is a flood watershed and a non-debris watershed;
when V is more than or equal to 0.001m and S is more than or equal to 0.05, the watershed is a debris flow watershed.
Judging the debris flow basin in the table 1 and the table 2: firstly, judging a debris flow basin source coefficient V, wherein V is more than or equal to 0.001 m; and then, carrying out early identification and judgment according to the debris flow basin identification index S: and when the S is more than or equal to 0.05, judging the debris flow basin.
In table 1, it is judged that there are 6 debris flow ditches in the debris flow basin after the venture earthquake, and debris flow occurs.
In table 2, it is determined that there are 2 debris flow gutters in the debris flow field before the venturi earthquake, and 4 debris flow gutters in the non-debris flow field. The Wenchuan earthquake changes the characteristics of the small watershed, so that 4 small watersheds which are not the debris watershed originally evolve into the debris watershed. The method can be applied to judging whether the small watershed of the strong earthquake area is a debris flow watershed or not.
In conclusion, the method has high accuracy in judging the early identification of the debris flow in the severe earthquake area. The influence of the violent earthquake on the debris flow basin is reflected in the judgment of the debris flow basin, and the method can be used for judging the debris flow basin in an violent earthquake affected area, and provides an important basis for avoiding debris flow danger in rainy seasons after disasters and planning and reconstructing after disasters.
Claims (2)
1. An early identification method for debris flow in a strong earthquake region is characterized by comprising the following steps:
a. determining basic parameters of potential debris flow basins through Google Earth or topographic maps: the method comprises the following steps of (1) obtaining a debris flow full-watershed area A0, a debris flow watershed forming area A, a debris flow watershed forming area shape coefficient F, a debris flow watershed forming area ditch length L and a debris flow watershed forming area ditch bed longitudinal gradient J;
b. determining the average width W of a channel in a debris flow basin forming area, the particle size D of particles in the debris flow basin forming area and the amount V of loose solid source in the debris flow basin by field investigation0；
c. Calculating a debris flow basin source coefficient V by using the formula 1;
V＝V0/A0 formula 1
Wherein V is the debris flow basin source coefficient in the unit m; v0The amount of the loose solid matter source in the debris flow basin refers to the loose solid matter source directly accumulated in the channel of the forming area and has the unit m3A0 is the total flow area of debris flow in m2；
d. Calculating a debris flow basin identification index S by using a formula 2;
S＝T0.2/G0.38formula 2
Wherein S is a debris flow basin identification index; t is a debris flow basin topographic factor and is calculated by the formula 3; g is a geological factor of the debris flow basin and is calculated by the formula 4;
T＝FJ(A/W2)0.2＝JA/L2(A/W2)0.2formula 3
Wherein T is a debris flow basin topographic factor; f is the shape coefficient of the debris flow basin forming area; l is the channel length of the debris flow basin forming area in the unit of m; j is the longitudinal gradient of the gully bed in the debris flow basin forming area; a is the area of the debris flow basin forming area and the unit m2(ii) a W is the average width of the channel in the debris flow basin forming area, and the unit is m;
G＝D/D0formula 4
Wherein G is a geological factor of the debris flow basin; d is the particle size of particles in a debris flow basin forming area, which is the average particle size of the surface of loose solid substances in the forming area and is unit mm; d0Is the minimum particle diameter of coarse particles, D0＝2mm；
e. Judging whether the river basin is a debris flow basin or not;
when V is less than 0.001m, the watershed is a flood watershed and a non-debris watershed;
when V is more than or equal to 0.001m and S is less than 0.05, the watershed is a flood watershed and a non-debris watershed;
when V is more than or equal to 0.001m and S is more than or equal to 0.05, the watershed is a debris flow watershed.
2. The early identification method of the debris flow in the earthquake-intensive area according to claim 1, characterized in that: when the debris flow basin is provided with a main ditch and more than 1 branch ditch, the maximum V value and the maximum S value are used as judgment indexes.
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| CN110390149B (en) * | 2019-07-10 | 2022-05-31 | 成都理工大学 | Strong earthquake region debris flow activity prediction method based on source aggregation quantity |
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