CN109166280A - A kind of EARLY RECOGNITION method and its application of meizoseismal area mud-rock flow - Google Patents
A kind of EARLY RECOGNITION method and its application of meizoseismal area mud-rock flow Download PDFInfo
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Abstract
The invention discloses a kind of EARLY RECOGNITION methods of meizoseismal area mud-rock flow, belong to debris flow control works technical field, characterized by comprising the following steps: a, determining the basic parameter of potential catchment basin of debris flow: the full drainage area A0 of mud-rock flow, catchment basin of debris flow form area's area A, catchment basin of debris flow forms area's form factor F, catchment basin of debris flow forms the long L of area's ditch and catchment basin of debris flow forms area's ditch bed longitudinal river slope J；B, determine that catchment basin of debris flow forms area's channel mean breadth W, catchment basin of debris flow forms area's grain diameter D and catchment basin of debris flow bulk solids material resource amount V0；C, catchment basin of debris flow material resource coefficient V is calculated；D, catchment basin of debris flow discrimination index S is calculated；E, judge whether it is catchment basin of debris flow.Influence of the present invention by the bulk solids material resource amount of research mud-rock flow to debris flow formation, proposes quantitative catchment basin of debris flow material resource amount judge index, greatly improves the EARLY RECOGNITION accuracy of mud-rock flow.
Description
Technical field
The present invention relates to debris flow control works technical field more particularly to a kind of EARLY RECOGNITIONs of meizoseismal area mud-rock flow
Method and its application.
Background technique
Mud-rock flow is a kind of natural calamity occurred in mountain area.After mud-rock flow occurs, mud-rock flow carries a large amount of silts, destroys by rush of water
Cities and towns destroy farmland and forest, the bridge road that destroys by rush of water, block traffic.It is induced in the strong zone of influence of earthquake after violent earthquake
A large amount of landslide and avalanche, for later period mud-rock flow provide a large amount of solid material resource.Studies at home and abroad show that strongly
Earthquake effect region tends to occur many places mud-rock flow in the rainfall after earthquake, sometimes or mass-sending property mud-rock flow；It is former
Not being the basin of debris flow gully, it is possible to develop into catchment basin of debris flow under the influence of violent earthquake；It is originally debris flow gully
Basin, it is possible to develop into high-frequency catchment basin of debris flow under the influence of violent earthquake, while the scale meeting that mud-rock flow occurs
It is bigger.Because the basin having before violent earthquake is not also debris flow gully, there is no the early stage sign of mud-rock flow, the pine in basin
It is seldom to dissipate solid material resource, therefore is defined as flood basin.But after violent earthquake, which may have landslide and avalanche,
And potential landslide and avalanche occur, and the original only possible basin that flood occurs is made to have the material resource item that mud-rock flow occurs
Part.But whether develop into catchment basin of debris flow, it is also necessary to which definitely method judges whether it is debris flow gully.Only definitely judgement is
No is catchment basin of debris flow, i.e. EARLY RECOGNITION catchment basin of debris flow could judge its risk, and make and assessing accordingly, early warning and
It administers.Current scientific research is especially unmatched there are no the EARLY RECOGNITION method that exact quantitative method determines mud-rock flow
The EARLY RECOGNITION method of meizoseismal area mud-rock flow when sign occurs for phase mud-rock flow.General mud-rock flow EARLY RECOGNITION is often
It by field investigation, determines whether early stage occurred mud-rock flow, mud-rock flow is judged whether there is according to deposit on deposition fan,
Whether interview survey occurred mud-rock flow in the recent period, and whether investigation has more bulk solids material resource in debris flow formation region.
These Mud Flows are often based on qualitative survey, and having above-mentioned condition is catchment basin of debris flow, i.e., in larger rainfall item
Mud-rock flow may occur under part.
For not having the basin of early stage mud-rock flow, bulk solids material resource is also considerably less, is confirmed as the stream of flood ditch
Domain, under the influence of violent earthquake, great changes are had occurred in the solid material resource condition in basin, cannot be determined with original qualitative method
It whether is catchment basin of debris flow.
Publication No. CN 104318058A, publication date are that on 01 28th, 2015 Chinese patent literatures disclose one kind
Debris flow early-warning method based on rainfall monitoring characterized by comprising the mud-rock flow thing established according to history rainfall product data
Part feature rainfall model, rainwash affair character rainfall model and normal precipitation affair character rainfall model, and determine area
Scaling function；Attenuation coefficient, weight coefficient and threshold limit value are determined according to the discrimination function；Acquire rainfall of the first n days
Data introduce attenuation coefficient and calculate the first n days effective rainfall；Weight coefficient and daily rainfall data are introduced, and according to the power
Weight coefficient, daily rainfall data and the first n days effective rainfall calculate feature rainfall；By the feature rainfall with it is described critical
Threshold value is compared, and determines whether daily rainfall can cause mud-rock flow event according to comparison result.The patent document discloses
Debris flow early-warning method based on rainfall monitoring, corresponding model is established by history rainfall product data, calculating is faced accordingly
Boundary's threshold value, merely by single characteristics of rainfall to determine whether mud-rock flow event can be caused, mud-rock flow EARLY RECOGNITION
Accuracy is lower.
Summary of the invention
The present invention in order to overcome the defects of the prior art described above, provide a kind of meizoseismal area mud-rock flow EARLY RECOGNITION method and
It is applied, and influence of the present invention by the bulk solids material resource amount of research mud-rock flow to debris flow formation proposes quantitative mud
Rock glacier basin material resource amount judge index, greatly improves the EARLY RECOGNITION accuracy of mud-rock flow.
The present invention is achieved through the following technical solutions:
A kind of EARLY RECOGNITION method of meizoseismal area mud-rock flow, which comprises the following steps:
A, the basic parameter of potential catchment basin of debris flow: the full drainage area of mud-rock flow is determined by Google Earth or topographic map
A0, catchment basin of debris flow form area's area A, catchment basin of debris flow forms area's form factor F, catchment basin of debris flow forms the long L of area's ditch and mud
Rock glacier basin formation area ditch bed longitudinal river slope J；
B, field investigation determines that catchment basin of debris flow forms area's channel mean breadth W, catchment basin of debris flow forms area's grain diameter D
With catchment basin of debris flow bulk solids material resource amount V0；
C, catchment basin of debris flow material resource coefficient V is calculated by formula 1；
V=V0/ A0 formula 1
Wherein, V is catchment basin of debris flow material resource coefficient, unit m；V0For catchment basin of debris flow bulk solids material resource amount, refer to straight
Meet the bulk solids material resource for being deposited in and being formed in area's channel, unit m3, A0 is the full drainage area of mud-rock flow, unit m2；
D, catchment basin of debris flow discrimination index S is calculated by formula 2；
S=T0.2/G0.38Formula 2
Wherein, S is catchment basin of debris flow discrimination index；T is catchment basin of debris flow terrain factor, is calculated by formula 3；G is mudstone
With flowing basin prime factor, is calculated by formula 4；
T=FJ (A/W2)0.2=JA/L2(A/W2)0.2Formula 3
Wherein, T is catchment basin of debris flow terrain factor；F is that catchment basin of debris flow forms area's form factor；L is catchment basin of debris flow
It is long to form area's ditch, unit m；J is that catchment basin of debris flow forms area's ditch bed longitudinal river slope；A is that catchment basin of debris flow forms area's area, unit
m2；W is that catchment basin of debris flow forms area's channel mean breadth, unit m；
G=D/D0Formula 4
Wherein, G for catchment basin of debris flow prime factor；D is that catchment basin of debris flow forms area's grain diameter, refers to that form area loose
The average grain central diameter partial size of solid matter surface, unit mm；D0For coarse granule minimum grain size, D0=2mm；
E, judge whether it is catchment basin of debris flow；
As V < 0.001m, basin is flood basin, non-catchment basin of debris flow；
As V >=0.001m and S < 0.05, basin is flood basin, non-catchment basin of debris flow；
As V >=0.001m and S >=0.05, basin is catchment basin of debris flow.
When the catchment basin of debris flow has tap drain and 1 or more Zhigou, using maximum V value and S value as judge index.
The present invention is suitable in violent earthquake influence area, the single-groove mudstone under the short-term and long-term earthquake effect time
The EARLY RECOGNITION of stream.
Catchment basin of debris flow of the present invention forms area and refers to that mud-rock flow is circulated through region and the above area of debris fans
Domain.
Basic principle of the invention is as follows:
The bulk solids for being formed as mountain torrents caused by rainfall and washing away debris flow formation region of strong seismic region mud-rock flow
Substance starts these solid matters and forms mud-rock flow.If bulk solid mass is very little, the bulk solid mass that mountain torrents wash away,
Mud-rock flow, preferably at most high sand-containing flood can't be formed by starting these solid matters.If catchment basin of debris flow discrimination index is too small,
Mountain torrents take husky scarce capacity, and fail to start forms solid matter in area's channel.
The reason for causing catchment basin of debris flow discrimination index too small has:
Catchment basin of debris flow terrain factor T is too small:
1) catchment basin of debris flow formation area's area A is too small, then charge for remittance is very little, and the mountain torrents that cannot form enough flows start solid
Substance；
2) catchment basin of debris flow formation area's ditch bed longitudinal river slope J is too small, and it is more difficult to start solid matter；
3) catchment basin of debris flow formation area's form factor F is too small, cannot converge to form bigger mountain torrents, does not start solid enough
Substance；
4) catchment basin of debris flow formation area's channel mean breadth W is too big, has dispersed mountain torrents in the water flow for forming area, has made to take husky energy
Power decline, cannot form mud-rock flow.
Catchment basin of debris flow prime factor G it is too big: catchment basin of debris flow formed area's grain diameter D it is too big, mountain torrents start solids
Matter is difficult.
Beneficial effects of the present invention are mainly manifested in following aspect:
1, of the invention, " a, the basic parameter that potential catchment basin of debris flow is determined by Google Earth or topographic map: mud-rock flow is complete
Drainage area A0, catchment basin of debris flow form area's area A, catchment basin of debris flow forms area's form factor F, catchment basin of debris flow forms area's ditch
Long L and catchment basin of debris flow form area's ditch bed longitudinal river slope J；B, field investigation determine catchment basin of debris flow formed area's channel mean breadth W,
Catchment basin of debris flow forms area's grain diameter D and catchment basin of debris flow bulk solids material resource amount V0；C, catchment basin of debris flow is calculated by formula 1
Material resource coefficient V；D, catchment basin of debris flow discrimination index S is calculated by formula 2；E, judge whether it is catchment basin of debris flow；As V < 0.001m
When, basin is flood basin, non-catchment basin of debris flow；As V >=0.001m and S < 0.05, basin is flood basin, non-mud-rock flow
Basin；As V >=0.001m and S >=0.05, basin is catchment basin of debris flow ", as a complete technical solution, more existing skill
For art, influence of the present invention by the bulk solids material resource amount of research mud-rock flow to debris flow formation proposes quantitative mud
Rock glacier basin material resource amount judge index, greatly improves the EARLY RECOGNITION accuracy of mud-rock flow.
2, of the invention, by studying influence of the distinguishing indexes of mud-rock flow to debris flow formation, propose quantitative mudstone
Flow basin distinguishing indexes judgment value；The grain diameter of fine parameter, especially bulk solid mass is given, mudstone is made
The EARLY RECOGNITION of stream is more acurrate.
3, of the invention, by studying influence of the distinguishing indexes of mud-rock flow to debris flow formation, give fine calculating
The ditch bedside degree of index, especially debris flow formation region, further improves the EARLY RECOGNITION accuracy of mud-rock flow.
4, of the invention, by studying influence of the distinguishing indexes of mud-rock flow to debris flow formation, give fine calculating
Index also includes that quantitative catchment basin of debris flow forms area's ditch bed longitudinal river slope, catchment basin of debris flow forms area's form factor and mud-rock flow
Basin formation area area, keeps the EARLY RECOGNITION of mud-rock flow more accurate.
Specific embodiment
Embodiment 1
A kind of EARLY RECOGNITION method of meizoseismal area mud-rock flow, comprising the following steps:
A, the basic parameter of potential catchment basin of debris flow: the full drainage area of mud-rock flow is determined by Google Earth or topographic map
A0, catchment basin of debris flow form area's area A, catchment basin of debris flow forms area's form factor F, catchment basin of debris flow forms the long L of area's ditch and mud
Rock glacier basin formation area ditch bed longitudinal river slope J；
B, field investigation determines that catchment basin of debris flow forms area's channel mean breadth W, catchment basin of debris flow forms area's grain diameter D
With catchment basin of debris flow bulk solids material resource amount V0；
C, catchment basin of debris flow material resource coefficient V is calculated by formula 1；
V=V0/ A0 formula 1
Wherein, V is catchment basin of debris flow material resource coefficient, unit m；V0For catchment basin of debris flow bulk solids material resource amount, refer to straight
Meet the bulk solids material resource for being deposited in and being formed in area's channel, unit m3, A0 is the full drainage area of mud-rock flow, unit m2；
D, catchment basin of debris flow discrimination index S is calculated by formula 2；
S=T0.2/G0.38Formula 2
Wherein, S is catchment basin of debris flow discrimination index；T is catchment basin of debris flow terrain factor, is calculated by formula 3；G is mudstone
With flowing basin prime factor, is calculated by formula 4；
T=FJ (A/W2)0.2=JA/L2(A/W2)0.2Formula 3
Wherein, T is catchment basin of debris flow terrain factor；F is that catchment basin of debris flow forms area's form factor；L is catchment basin of debris flow
It is long to form area's ditch, unit m；J is that catchment basin of debris flow forms area's ditch bed longitudinal river slope；A is that catchment basin of debris flow forms area's area, unit
m2；W is that catchment basin of debris flow forms area's channel mean breadth, unit m；
G=D/D0Formula 4
Wherein, G for catchment basin of debris flow prime factor；D is that catchment basin of debris flow forms area's grain diameter, refers to that form area loose
The average grain central diameter partial size of solid matter surface, unit mm；D0For coarse granule minimum grain size, D0=2mm；
E, judge whether it is catchment basin of debris flow；
As V < 0.001m, basin is flood basin, non-catchment basin of debris flow；
As V >=0.001m and S < 0.05, basin is flood basin, non-catchment basin of debris flow；
As V >=0.001m and S >=0.05, basin is catchment basin of debris flow.
" a, the basic parameter that potential catchment basin of debris flow is determined by Google Earth or topographic map: the full drainage area of mud-rock flow
A0, catchment basin of debris flow form area's area A, catchment basin of debris flow forms area's form factor F, catchment basin of debris flow forms the long L of area's ditch and mud
Rock glacier basin formation area ditch bed longitudinal river slope J；B, field investigation determines that catchment basin of debris flow forms area's channel mean breadth W, mud-rock flow
Basin formation area grain diameter D and catchment basin of debris flow bulk solids material resource amount V0；C, catchment basin of debris flow material resource system is calculated by formula 1
Number V；D, catchment basin of debris flow discrimination index S is calculated by formula 2；E, judge whether it is catchment basin of debris flow；As V < 0.001m, stream
Domain is flood basin, non-catchment basin of debris flow；As V >=0.001m and S < 0.05, basin is flood basin, non-catchment basin of debris flow；
As V >=0.001m and S >=0.05, basin is catchment basin of debris flow ", as a complete technical solution, compared with the prior art
Speech, influence of the present invention by the bulk solids material resource amount of research mud-rock flow to debris flow formation, proposes quantitative mud-rock flow
Basin material resource amount judge index, greatly improves the EARLY RECOGNITION accuracy of mud-rock flow.
Embodiment 2
A kind of EARLY RECOGNITION method of meizoseismal area mud-rock flow, comprising the following steps:
A, the basic parameter of potential catchment basin of debris flow: the full drainage area of mud-rock flow is determined by Google Earth or topographic map
A0, catchment basin of debris flow form area's area A, catchment basin of debris flow forms area's form factor F, catchment basin of debris flow forms the long L of area's ditch and mud
Rock glacier basin formation area ditch bed longitudinal river slope J；
B, field investigation determines that catchment basin of debris flow forms area's channel mean breadth W, catchment basin of debris flow forms area's grain diameter D
With catchment basin of debris flow bulk solids material resource amount V0；
C, catchment basin of debris flow material resource coefficient V is calculated by formula 1；
V=V0/ A0 formula 1
Wherein, V is catchment basin of debris flow material resource coefficient, unit m；V0For catchment basin of debris flow bulk solids material resource amount, refer to straight
Meet the bulk solids material resource for being deposited in and being formed in area's channel, unit m3, A0 is the full drainage area of mud-rock flow, unit m2；
D, catchment basin of debris flow discrimination index S is calculated by formula 2；
S=T0.2/G0.38Formula 2
Wherein, S is catchment basin of debris flow discrimination index；T is catchment basin of debris flow terrain factor, is calculated by formula 3；G is mudstone
With flowing basin prime factor, is calculated by formula 4；
T=FJ (A/W2)0.2=JA/L2(A/W2)0.2Formula 3
Wherein, T is catchment basin of debris flow terrain factor；F is that catchment basin of debris flow forms area's form factor；L is catchment basin of debris flow
It is long to form area's ditch, unit m；J is that catchment basin of debris flow forms area's ditch bed longitudinal river slope；A is that catchment basin of debris flow forms area's area, unit
m2；W is that catchment basin of debris flow forms area's channel mean breadth, unit m；
G=D/D0Formula 4
Wherein, G for catchment basin of debris flow prime factor；D is that catchment basin of debris flow forms area's grain diameter, refers to that form area loose
The average grain central diameter partial size of solid matter surface, unit mm；D0For coarse granule minimum grain size, D0=2mm；
E, judge whether it is catchment basin of debris flow；
As V < 0.001m, basin is flood basin, non-catchment basin of debris flow；
As V >=0.001m and S < 0.05, basin is flood basin, non-catchment basin of debris flow；
As V >=0.001m and S >=0.05, basin is catchment basin of debris flow.
When the catchment basin of debris flow has tap drain and 1 or more Zhigou, using maximum V value and S value as judge index.
The present invention is suitable in violent earthquake influence area, the single-groove mudstone under the short-term and long-term earthquake effect time
The EARLY RECOGNITION of stream.
By studying influence of the distinguishing indexes of mud-rock flow to debris flow formation, quantitative catchment basin of debris flow identification is proposed
Index judgment value；The grain diameter of fine parameter, especially bulk solid mass is given, the early stage of mud-rock flow is known
It is not more acurrate.
By studying influence of the distinguishing indexes of mud-rock flow to debris flow formation, fine parameter is given, especially
It is the ditch bedside degree of debris flow formation region, further improves the EARLY RECOGNITION accuracy of mud-rock flow.
By studying influence of the distinguishing indexes of mud-rock flow to debris flow formation, fine parameter is given, is also wrapped
It includes quantitative catchment basin of debris flow and forms area's ditch bed longitudinal river slope, catchment basin of debris flow formation area's form factor and catchment basin of debris flow formation area
Area keeps the EARLY RECOGNITION of mud-rock flow more accurate.
Below with reference to specific example, detailed description of embodiments of the present invention:
The town Ying Xiu of the violent earthquake zone of influence of Wenchuan in 2008 to Wenchuan county town section be the strong zone of influence of Wenchuan earthquake, in river in Shangdong Province
Before valley shake occurs, which once had mud-rock flow to occur, and generally only mud-rock flow occurs for single-groove, and frequency is lower.In August, 2010
Mass-sending mud-rock flow occurs twice for 13 days and on July 10th, 2013, the region undergoes heavy rainfall.This has in the region of rainfall data
There are 6 catchment basin of debris flow, 8 mud-rock flows have occurred during mass-sending mud-rock flow twice in this altogether.Using formula of the invention to upper
It states 6 debris flow gullies and carries out EARLY RECOGNITION judgement.
First by the way that the catchment basin of debris flow that topographic map measures each catchment basin of debris flow forms area's area A, catchment basin of debris flow is formed
Area form factor F, catchment basin of debris flow form the long L of area's ditch and catchment basin of debris flow forms area's ditch bed longitudinal river slope J；Field investigation determines mud
Rock glacier basin formation area channel mean breadth W and catchment basin of debris flow form area's grain diameter D, catchment basin of debris flow bulk solids material resource
Measure V0；Catchment basin of debris flow material resource coefficient V is calculated by formula 1；Catchment basin of debris flow terrain factor T is calculated by formula 3；It is logical
Cross prime factor G catchment basin of debris flow is calculated of formula 4；Catchment basin of debris flow discrimination index S is calculated by formula 2 again.
The EARLY RECOGNITION judge index catchment basin of debris flow material resource system of parameter and calculating of 6 debris flow gullies after Wenchuan earthquake
Number V and catchment basin of debris flow discrimination index S and mud-rock flow to actually occur situation as shown in table 1；Table 1 is the mud after Wenchuan earthquake
Rock glacier landform, geology, material resource coefficient, EARLY RECOGNITION judgment value table.Table 2 is mud-rock flow landform, geology, material resource before Wenchuan earthquake
Coefficient, EARLY RECOGNITION judgment value table.
| Ditch name | A(m2) | F | J | D(mm) | W(m) | T | G | S | V0(m3) | V(m) | EARLY RECOGNITION |
| Small fiber crops gully | 1650000 | 0.661 | 0.506 | 200 | 12 | 2.17 | 100 | 0.203 | 455000 | 0.276 | It is |
| Lotus flower heart ditch | 7680000 | 0.307 | 0.318 | 50 | 5.5 | 1.19 | 25 | 0.304 | 1060000 | 0.138 | It is |
| Silver-colored factory's ditch | 5020000 | 0.359 | 0.455 | 350 | 20 | 1.07 | 175 | 0.143 | 1520000 | 0.303 | It is |
| Big cloaca | 14500000 | 0.488 | 0.393 | 250 | 20 | 1.56 | 125 | 0.175 | 4270000 | 0.294 | It is |
| Mill ditch | 3170000 | 0.445 | 0.412 | 225 | 18 | 1.15 | 112.5 | 0.171 | 1330000 | 0.420 | It is |
| Peaceful ditch | 14200000 | 0.452 | 0.298 | 300 | 6 | 1.77 | 150 | 0.167 | 2890000 | 0.2035 | It is |
Table 1
| Ditch name | A(m2) | F | J | D(mm) | W(m) | T | G | S | V0(m3) | V(m) | EARLY RECOGNITION |
| Small fiber crops gully | 1650000 | 0.661 | 0.506 | 1000 | 22 | 1.7 | 500 | 0.105 | 80000 | 0.04848 | It is |
| Lotus flower heart ditch | 7680000 | 0.307 | 0.318 | 1000 | 16 | 0.77 | 500 | 0.089 | 6000 | 0.00078 | It is no |
| Silver-colored factory's ditch | 5020000 | 0.359 | 0.455 | 1000 | 29 | 0.93 | 500 | 0.093 | 3500 | 0.0007 | It is no |
| Big cloaca | 14500000 | 0.488 | 0.393 | 1000 | 33 | 1.28 | 500 | 0.099 | 12000 | 0.00083 | It is no |
| Mill ditch | 3170000 | 0.445 | 0.412 | 1000 | 30 | 0.94 | 500 | 0.093 | 20000 | 0.00631 | It is |
| Peaceful ditch | 14200000 | 0.452 | 0.298 | 1000 | 18 | 1.14 | 500 | 0.097 | 10000 | 0.0007 | It is no |
Table 2
Mud-rock flow EARLY RECOGNITION judgment criteria:
As V < 0.001m, basin is flood basin, non-catchment basin of debris flow；
As V >=0.001m and S < 0.05, basin is flood basin, non-catchment basin of debris flow；
As V >=0.001m and S >=0.05, basin is catchment basin of debris flow.
To the catchment basin of debris flow judgement in Tables 1 and 2: firstly, catchment basin of debris flow material resource coefficient V judges, V >=0.001m；
EARLY RECOGNITION judgement is carried out further according to catchment basin of debris flow discrimination index S: as S >=0.05, being judged as catchment basin of debris flow.
Judge that the debris flow gully of catchment basin of debris flow after Wenchuan earthquake there are 6 in table 1, mud-rock flow all has occurred.
Judge that the debris flow gully of catchment basin of debris flow before Wenchuan earthquake there are 2 in table 2, the debris flow gully of non-catchment basin of debris flow has
4.Illustrate that Wenchuan earthquake changes small watershed feature, make 4 originally be not catchment basin of debris flow small watershed, develop into mud-rock flow
Basin.Present invention could apply to strong seismic region small watershed whether be catchment basin of debris flow judgement.
In conclusion using the method for the invention to the judgment accuracy of the EARLY RECOGNITION of strong seismic region mud-rock flow very
It is high.Influence of the violent earthquake to catchment basin of debris flow embodies in the judgement of catchment basin of debris flow, can be used for violent earthquake shadow
The catchment basin of debris flow judgement in area is rung, planning reconstruction provides important evidence after avoiding mud-rock flow danger and calamity for rainy season after calamity.
Claims (3)
1. a kind of EARLY RECOGNITION method of meizoseismal area mud-rock flow, which comprises the following steps:
A, the basic parameter of potential catchment basin of debris flow: the full drainage area A0 of mud-rock flow, mud is determined by Google Earth or topographic map
Rock glacier basin formation area area A, catchment basin of debris flow form area's form factor F, catchment basin of debris flow forms the long L of area's ditch and mud-rock flow stream
Domain formation area ditch bed longitudinal river slope J；
B, field investigation determines that catchment basin of debris flow forms area's channel mean breadth W, catchment basin of debris flow forms area's grain diameter D and mud
Rock glacier basin bulk solids material resource amount V0；
C, catchment basin of debris flow material resource coefficient V is calculated by formula 1；
V=V0/ A0 formula 1
Wherein, V is catchment basin of debris flow material resource coefficient, unit m；V0For catchment basin of debris flow bulk solids material resource amount, refer to direct accumulation
In the bulk solids material resource formed in area's channel, unit m3, A0 is the full drainage area of mud-rock flow, unit m2；
D, catchment basin of debris flow discrimination index S is calculated by formula 2；
S=T0.2/G0.38Formula 2
Wherein, S is catchment basin of debris flow discrimination index；T is catchment basin of debris flow terrain factor, is calculated by formula 3；G is mud-rock flow stream
Domain ground prime factor, is calculated by formula 4；
T=FJ (A/W2)0.2=JA/L2(A/W2)0.2Formula 3
Wherein, T is catchment basin of debris flow terrain factor；F is that catchment basin of debris flow forms area's form factor；L is formed for catchment basin of debris flow
Area's ditch is long, unit m；J is that catchment basin of debris flow forms area's ditch bed longitudinal river slope；A is that catchment basin of debris flow forms area's area, unit m2；W is
Catchment basin of debris flow forms area's channel mean breadth, unit m；
G=D/D0Formula 4
Wherein, G for catchment basin of debris flow prime factor；D is that catchment basin of debris flow forms area's grain diameter, refers to form area's bulk solids
The average grain central diameter partial size of material surface, unit mm；D0For coarse granule minimum grain size, D0=2mm；
E, judge whether it is catchment basin of debris flow；
As V < 0.001m, basin is flood basin, non-catchment basin of debris flow；
As V >=0.001m and S < 0.05, basin is flood basin, non-catchment basin of debris flow；
As V >=0.001m and S >=0.05, basin is catchment basin of debris flow.
2. a kind of EARLY RECOGNITION method of meizoseismal area mud-rock flow according to claim 1, it is characterised in that: the mud-rock flow
When there are tap drain and 1 or more Zhigou in basin, using maximum V value and S value as judge index.
3. a kind of application of the EARLY RECOGNITION method of meizoseismal area mud-rock flow according to claim 1, it is characterised in that: be applicable in
In in violent earthquake influence area, the EARLY RECOGNITION of the single-gully mud-rock flow under the short-term and long-term earthquake effect time.
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