Landslide dammed disaster chain cooperative early warning method and system

Abstract

The landslide damming disaster chain cooperative early warning method and system provided by the application relates to the field of disaster early warning. The method comprises the following steps: receiving landslide shock signals and water level signals in real time; obtaining time and position information of landslide occurrence according to landslide shock signal analysis, and issuing a large landslide warning; evaluating the possibility of river blocking caused by landslide according to the spatial relationship between landslide and river system; if there is a possibility of river blocking caused by landslide, issuing a secondary warning of river blocking, and combining the water level signal to determine whether the river has been blocked; if the river has been blocked, issuing a primary warning of river blocking, and positioning the blocking point according to the spatial relationship between landslide and river system; evaluating the risk of landslide damming backwater and flood outburst according to the water level signal, and issuing a corresponding grade of flood warning. The application actively issues landslide damming stage identification and early warning information by timely and accurate identification of the disaster link and severity of landslide damming, which helps to automatically identify the disaster process of the landslide damming disaster chain.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of disaster early warning, in particular to a landslide dammed disaster chain cooperative early warning method and system. BACKGROUND

[0002] The landslide dammed disaster chain generally refers to landslide damming and the chain-born upstream backwater and downstream breach flood events, and the complete disaster chain process includes four disaster links of landslide-damming-backwater-breach. The landslide dammed disaster chain evolves from the point domain landslide disaster to the line domain river flood, the influence range is prolonged, the damage area is expanded, and several kilometers or several tens of kilometers of the area may suffer from the flood; when the breach occurs, the river water level increases sharply, and the destructive power also rises sharply, which may cause the bridge along the river to be washed away, the roadbed to collapse, and the house to collapse.

[0003] Due to the suddenness of the disaster chain, it is difficult to find the activity signs in advance, and it is difficult to implement monitoring and early warning. The recent landslide dammed lakes such as Yigong landslide dammed lake, Beichuan Tangjiashan landslide dammed lake, Baige landslide dammed lake, and Ceduopu landslide dammed lake were all discovered by local personnel after the landslide damming occurred, and the emergency response was started by the emergency department after receiving the information. If the landslide damming can be found in time and accurately through monitoring and early warning means, and the dammed lake flood that may occur is warned, more valuable time will be provided for the emergency response of the landslide dammed disaster chain.

[0004] The existing landslide dammed early warning is often reported by the local residents at the dammed point after discovering the landslide damming of the river, or by the nearby residents after discovering the sudden rise or fall of the river water level. If the dammed point is located in an uninhabited or sparsely populated area, or the residents lack experience to determine the occurrence of damming according to the water level change, the rescue opportunity may be missed due to the failure to find the damming in time.

[0005] The disaster chain activity can be roughly divided into pre-chain events and post-chain events, and the outstanding features are intermittency and amplification, that is, there is an intermittent period between the pre-chain and the post-chain, and the post-chain is often larger in scale and stronger in destructive power. Due to the concealment of the pre-chain events, it is difficult to lock the activity area in advance, although the activity area of the post-chain events is clear, but it is complex and variable, and the window period available for disposal is often short, and once the disposal fails, it may bring serious consequences due to the amplification. From the perspective of emergency management business, the main purpose is to break the chain or reduce the disaster loss of the post-chain.

[0006] Limited by the limited funds, it is impossible to take point domain monitoring facilities for every slope and channel in all prone areas, but if the pre-chain events can be quickly identified and the activity area can be located through the monitoring station network, it is helpful to take active measures to deal with the post-chain; for the post-chain events, if the change of the disaster environment and the disaster characteristic index can be judged through the monitoring station network and the necessary supplementary point monitoring, it is beneficial to accurate decision-making and disaster reduction. SUMMARY

[0007] The purposes of the present application include, for example, providing a landslide damming disaster chain cooperative early warning method and system, which can help to automatically determine the disaster process of the landslide damming disaster chain by timely and accurately identifying the disaster link and severity of the landslide damming, and actively issuing the landslide damming stage determination and early warning information, and filling the gap of the landslide damming disaster chain cooperative early warning technology in unpopulated areas.

[0008] Embodiments of the present application can be implemented as follows:

[0009] In a first aspect, an embodiment of the present application provides a landslide damming disaster chain cooperative early warning method, comprising:

[0010] Real-time receiving of landslide shock signals and water level signals, wherein the landslide shock signals refer to low-frequency vibration signals generated in the landslide occurrence process, and the water level signals refer to sensing signals generated when the river water level changes;

[0011] According to the landslide shock signals, the time and location information of the landslide occurrence are analyzed, and a large landslide warning is issued;

[0012] According to the spatial relationship between the landslide and the river system, the possibility of the landslide causing the river blocking is determined; if the landslide has the possibility of causing the river blocking, a river blocking secondary early warning is issued, and whether the river blocking has occurred is determined in combination with the water level signals; if it is determined that the river blocking has occurred, a river blocking primary early warning is issued, and the river blocking point is located according to the spatial relationship between the landslide and the river system.

[0013] According to the water level signals, the danger of landslide damming backwater and flood breaking is evaluated, and a flood warning corresponding to the danger level of the landslide damming backwater and flood breaking is issued.

[0014] Further, in an optional embodiment, in the step of real-time receiving of landslide shock signals and water level signals, the landslide shock signals include low-frequency vibration signals in more than three different directions, and the water level signals include more than two groups.

[0015] Further, in an optional embodiment, in the step of analyzing the time and location information of the landslide occurrence according to the landslide shock signals and issuing a large landslide warning, assuming that the signal recorded by the vibration collector Ei arrives at the time Ti, the collector point horizontal coordinate Xi and the vertical coordinate Yi, the epicenter position (X, Y) and the earthquake time (T) are solved, there is V(Ti-T)=S((Xi-X), (Yi-Y)), more than three groups of vibration collector signals are used, the epicenter position (X, Y) and the earthquake time (T) are determined through numerical iterative analysis.

[0016] Further, in the optional embodiment, the step of judging the possibility of blocking the river caused by the landslide according to the spatial relationship between the landslide and the river system; if the landslide has the possibility of blocking the river, the step of issuing the secondary warning of blocking the river comprises:

[0017] According to the horizontal and vertical coordinates of the large landslide point and the contour lines of the adjacent terrain, the elevation coordinate Z of the landslide point is interpolated;

[0018] Assuming that the volume of the large landslide is V, the apparent friction coefficient c is converted according to the functional relationship between the volume and the apparent friction coefficient c=c(V);

[0019] The strike line of the gully bed (or slide bed) under the landslide point is identified, and the strike line between the landslide point D1 and the intersection point D2 is counted as the blocking river path t until the strike line intersects with the river line strike. The coordinates of the point D2 are read;

[0020] According to the height difference ΔH and the path length ΔL of the path, the tangent value c(t)=tan(arcsin(ΔH / ΔL)) is calculated;

[0021] According to the size of c and c(t), the possibility of blocking the river is judged. When c is smaller than c(t), the apparent friction coefficient of the landslide is small, the distance of the landslide is large, and the possibility of blocking the river is large; otherwise, the possibility of blocking the river is small;

[0022] When the possibility of blocking the river is large, the secondary warning information of the landslide blocking the river is issued, and the landslide blocking the river warning response work is carried out.

[0023] Further, in the optional embodiment, in the step of judging whether the blocking of the river has occurred by combining the water level signal; if it is determined that the blocking of the river has occurred, the primary warning of the blocking of the river is issued, and the blocking point position of the river is located according to the spatial relationship between the landslide and the river system. When the water level monitored by the downstream sensor of the water level sensor group decreases and the water level monitored by the upstream sensor increases, it is determined that the water level sensor group is blocked, the intersection point D2 of the landslide path t and the river is taken as the blocking point position of the river, and the primary warning of the blocking of the river is issued;

[0024] If the water level monitored by the water level sensor group decreases and the water level monitored by the upstream sensor decreases earlier than the water level monitored by the downstream sensor, it is determined that the upstream of the water level sensor group is blocked, the intersection point D2 of the landslide path t and the river is taken as the blocking point position of the river, and the primary warning of the blocking of the river is issued;

[0025] If the water level monitored by the water level sensor group increases and the water level monitored by the downstream sensor increases earlier than the water level monitored by the upstream sensor, it is determined that the downstream of the water level sensor group is blocked, the intersection point D2 of the landslide path t and the river is taken as the blocking point position of the river, and the primary warning of the blocking of the river is issued.

[0026] Further, in the optional embodiment, when the water level monitored by the downstream sensor of the water level sensor group decreases and the water level monitored by the upstream sensor increases, it is determined that the water level sensor group is blocked, the intersection D2 of the landslide path t and the river is taken as the blocking point position, and the step of issuing the first blocking warning is:

[0027] If the warning center monitors that the water level monitored by the downstream sensor decreases by more than 1.2 times the fluctuation amplitude within a unit monitoring time, the warning center issues a fourth-level warning information;

[0028] If the warning center monitors that the water level monitored by the downstream sensor decreases by more than 1.5 times the fluctuation amplitude within a unit monitoring time, the warning center issues a third-level warning information;

[0029] If the warning center monitors that the water level monitored by the downstream sensor decreases by more than 2 times the fluctuation amplitude within a unit monitoring time, the warning center issues a second-level blocking warning information;

[0030] If the warning center monitors that the water level monitored by the downstream sensor decreases to a stable water level and lasts for more than a unit monitoring time, the warning center issues a first-level blocking warning information; and,

[0031] If the warning center monitors that the water level monitored by the downstream sensor decreases and then suddenly increases to a stable water level, and the stable water level lasts for at least two unit monitoring times, the warning center cancels the warning information.

[0032] Further, in the optional embodiment, when the water level monitored by the downstream sensor of the water level sensor group decreases and the water level monitored by the upstream sensor increases, it is determined that the water level sensor group is blocked, the intersection D2 of the landslide path t and the river is taken as the blocking point position, and the step of issuing the first blocking warning is:

[0033] If the warning center monitors that the water level monitored by the upstream sensor decreases by more than 1.2 times the fluctuation amplitude within a unit monitoring time, the warning center issues a fourth-level warning information;

[0034] If the warning center monitors that the water level monitored by the upstream sensor decreases by more than 1.5 times the fluctuation amplitude within a unit monitoring time, the warning center issues a third-level warning information;

[0035] If the warning center monitors that the water level monitored by the upstream sensor decreases by more than 2 times the fluctuation amplitude within a unit monitoring time, the warning center issues a second-level blocking warning;

[0036] If the early warning center monitors that the water level monitored by the upstream sensor drops to a stable water level and lasts for more than one unit of monitoring time, the early warning center issues a first-level warning of river blockage; and

[0037] If the water level monitored by the upstream sensor suddenly rises after dropping and then drops to a stable water level, and the stable water level lasts for at least two units of monitoring time, the early warning center cancels the warning information.

[0038] Further, in an optional embodiment, in the step of determining that the downstream of the group of water level sensors is blocked if the water levels monitored by the group of water level sensors all rise and the water level monitored by the downstream sensor rises earlier than the water level monitored by the upstream sensor, taking the intersection D2 of the landslide path t and the river channel as the position of the river blockage point, issuing the first-level warning of river blockage,

[0039] If the early warning center monitors that the water level monitored by the downstream sensor rises by more than 1.2 times the fluctuation amplitude within a unit of monitoring time, the early warning center issues a fourth-level warning information;

[0040] If the early warning center monitors that the water level monitored by the downstream sensor rises by more than 1.5 times the fluctuation amplitude within a unit of monitoring time, the early warning center issues a third-level warning information;

[0041] If the early warning center monitors that the water level monitored by the downstream sensor rises by more than 2 times the fluctuation amplitude within a unit of monitoring time, the early warning center issues a second-level warning information of river blockage;

[0042] If the early warning center monitors that the water level monitored by the downstream sensor rises to a stable water level, the early warning center issues a first-level warning information of river blockage; and

[0043] If the early warning center monitors that the water level monitored by the downstream sensor rises and then drops to a stable water level and lasts for at least two units of monitoring time, the early warning center cancels the warning information.

[0044] Further, in an optional embodiment, in the step of evaluating the danger of landslide blockage backwater and flood outburst according to the water level signals, and issuing a flood warning corresponding to the level of danger of landslide blockage backwater and flood outburst, if it is evaluated that the landslide cannot reach the near shore of the main channel, a fourth-level warning of river blockage is issued; if it is evaluated that the landslide can reach the near shore but cannot reach the far shore, a third-level warning of river blockage is issued; if it is evaluated that the landslide can reach the far shore but the distance is less than the limit river width, a second-level warning of river blockage is issued; if it is evaluated that the distance of the landslide is greater than the limit river width, a first-level warning of river blockage is issued.

[0045] In a second aspect, the embodiments of the present application provide a landslide damming disaster chain cooperative early warning system for implementing the landslide damming disaster chain cooperative early warning method, the landslide damming disaster chain cooperative early warning system comprising a collection module, a processing module and a release module.

[0046] The collection module is configured to acquire the landslide vibration signal and the water level signal, the processing module is configured to analyze the landslide vibration signal to obtain time and position information of landslide occurrence, and the release module is configured to release a large landslide warning.

[0047] The processing module is further configured to evaluate the possibility of river blocking caused by the landslide according to the spatial relationship between the landslide and the river system, the release module is further configured to release a river blocking secondary warning if the landslide has the possibility of causing river blocking, the processing module is further configured to determine whether river blocking has occurred in combination with the water level signal, the release module is further configured to release a river blocking primary warning if it is determined that river blocking has occurred, and the processing module is further configured to locate the river blocking point according to the spatial relationship between the landslide and the river system if it is determined that river blocking has occurred.

[0048] The processing module is further configured to evaluate the danger of landslide damming backwater and flood outburst according to the water level signal, and the release module is further configured to release a flood warning corresponding to the danger level of landslide damming backwater and flood outburst.

[0049] The landslide damming disaster chain cooperative early warning method and system provided by the present application have the following beneficial effects: In the past, the landslide damming disaster chain mainly relied on local residents to identify and report, and it was difficult to report to the emergency management department at the beginning of the event, which might miss the valuable response opportunity. The landslide damming disaster chain disaster identification and early warning analysis method and system provided by the embodiments of the present application are helpful to timely and accurately identify each link of the disaster chain, and are particularly suitable for disaster chain early warning analysis in unpopulated areas. The embodiments of the present application provide a solution for damming point identification and disaster chain early warning by combining the cooperative analysis of landslide vibration signals and river water level signals, and provide technical support for more accurate emergency response. BRIEF DESCRIPTION OF DRAWINGS

[0050] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0051] Figure 1 The schematic diagram of the landslide damming disaster chain cooperative early warning method described in the embodiments of the present application. DETAILED DESCRIPTION

[0052] In order to make the above objectives, characteristics and advantages of the present application more apparent, concrete embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0053] In order to make the objectives, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the accompanying drawings can be arranged and designed in various different configurations.

[0054] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0055] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0056] It should be noted that: the features in the embodiments of the present application can be combined with each other without conflict.

[0057] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0058] Referring to Figure 1 The embodiment provides a landslide dam disaster chain cooperative early warning method, which timely and accurately identifies a disaster link and severity of landslide dam, and actively sends landslide dam stage identification and early warning information, so as to help automatically identify a disaster process of the landslide dam disaster chain, and fill a blank of the landslide dam disaster chain cooperative early warning technology in an unmanned area.

[0059] Referring to Figure 1 The landslide dam disaster chain cooperative early warning method provided by the embodiment of the present application comprises the following steps.

[0060] Step S100: real-time receiving of landslide shock signals and water level signals, wherein the landslide shock signals refer to low-frequency vibration signals generated in a landslide occurrence process, and the water level signals refer to sensing signals generated when a river water level changes.

[0061] It should be understood that step S100 receives the monitoring signal, that is, receives the slide shock signal and water level signal provided by the monitoring station network; the slide shock signal refers to the low-frequency vibration signal generated during the occurrence of a landslide, which can be collected by a vibration collector (such as a wideband seismograph). In order to accurately locate the position of the earthquake source, more than 3 groups of low-frequency vibration signals in different directions can be designed; the water level signal refers to the sensing signal generated when the water level of the river changes, which can be collected by a water level collector (such as an ultrasonic water level meter). In order to determine the barrier section, more than 2 groups of water level signals can be designed.

[0062] Step S200: According to the analysis of the slide shock signal, the time and position information of the landslide occurrence are obtained, and a large landslide warning is issued.

[0063] It should be pointed out that in step S200, the commonly used earthquake source positioning algorithm can be used to determine the position and time of the slide shock. Assuming that the signal recorded by the vibration collector Ei arrives at time Ti, the horizontal coordinate Xi and the vertical coordinate Yi of the collector point, the earthquake source position (X, Y) and the earthquake time (T) are solved. Then there is V(Ti-T) = S((Xi-X), (Yi-Y)), more than three groups of vibration collector signals are used, and the three parameters (X, Y, T) of the earthquake source, that is, the position and time of the earthquake source, can be accurately determined through numerical iterative analysis. On this basis, a large landslide warning is issued to inform the time and position of the landslide, carry out landslide early warning response work, and prepare for landslide barrier disaster chain emergency response.

[0064] Step S300: According to the spatial relationship between the landslide and the river system, it is judged whether the landslide causes the possibility of blocking the river; if the landslide has the possibility of causing the river to be blocked, a secondary warning of blocking the river is issued, and combined with the water level signal, it is judged whether the river has been blocked; if it is determined that the river has been blocked, a primary warning of blocking the river is issued, and the blocking point of the river is located according to the spatial relationship between the landslide and the river system.

[0065] For step S300, according to the spatial relationship between the landslide and the river system, it is judged whether the landslide causes the possibility of blocking the river; if the landslide has the possibility of causing the river to be blocked, a secondary warning of blocking the river is issued, and combined with the water level signal, it is judged whether the river has been blocked; if it is determined that the river has been blocked, a primary warning of blocking the river is issued, and the blocking point of the river is located according to the spatial relationship between the landslide and the river system. Among them, according to the spatial relationship between the landslide and the river system, it is judged whether the landslide causes the possibility of blocking the river; if the landslide has the possibility of causing the river to be blocked, a secondary warning of blocking the river is issued, which is determined according to the large landslide outflow distance prediction and the relative position of the far end of the river bank. The specific steps are as follows:

[0066] (1) Identify the elevation coordinate Z of the landslide. According to the horizontal and vertical coordinates of the large landslide point and the adjacent topographic contour line, the elevation coordinate Z of the landslide point is interpolated;

[0067] (2) Conversion of apparent friction coefficient c. Assuming that the volume of a large landslide is V, the apparent friction coefficient c is converted according to the functional relationship c = c(V) between volume and apparent friction coefficient;

[0068] (3) Identify the landslide blocking river movement path t. Identify the strike line of the landslide point below the channel bed (or slide bed), and until the strike line intersects with the river line, the strike line between the landslide point D1 and the intersection point D2 is calculated as the blocking river path t, and the coordinates of the D2 point are read;

[0069] (4) Calculate the tangent value c(t) of the path. According to the height difference ΔH and the path length ΔL of the first and last points of the path, the tangent value c(t) = tan(arcsin(ΔH / ΔL)) is calculated.

[0070] (5) Determine the possibility of blocking the river according to the size of c and c(t). When c is smaller than c(t), it means that the apparent friction coefficient of the landslide is small, the outflow distance is large, and the possibility of blocking the river is large; otherwise, the possibility of blocking the river is small.

[0071] (6) Issue a landslide blocking river warning. When the possibility of blocking the river is large, issue a secondary warning information of landslide blocking river, and carry out a landslide blocking river warning response work.

[0072] When the possibility of landslide blocking river is present, the blocking river event may not occur or may not be completed immediately, and it still needs to be confirmed whether the river is blocked. In the case that the person has not arrived at the scene, the surrounding water level sensors can be used for monitoring and analysis.

[0073] Generally, the water level upstream of the blockage point rises significantly, and the water level downstream falls significantly. For the combination of water level signals, it is determined whether the river has been blocked; if it is determined that the river has been blocked, a primary warning of blocking the river is issued, and the steps of positioning the blocking river point according to the spatial relationship between the landslide and the river system are as follows:

[0074] Case one: if the water level monitored by the downstream sensor in the water level sensor group decreases and the water level monitored by the upstream sensor increases, it is determined that the water level sensor group is blocked, the intersection point D2 of the landslide path t and the river is taken as the blocking river point position, and a primary warning of blocking the river is issued;

[0075] Case two: if the water level monitored by the water level sensor group decreases and the water level monitored by the upstream sensor decreases earlier than the water level monitored by the downstream sensor, it is determined that the upstream of the water level sensor group is blocked, the intersection point D2 of the landslide path t and the river is taken as the blocking river point position, and a primary warning of blocking the river is issued;

[0076] Case three: if the water level monitored by the water level sensor group rises and the water level monitored by the downstream sensor rises first, it is determined that the downstream of the water level sensor group is blocked, the intersection D2 of the landslide path t and the river is taken as the position of the blocking point, and a first-level blocking river warning is issued.

[0077] It should be noted that the rising or falling amplitude in the above three cases should be 1.2 times the fluctuation amplitude of the normal water level. At the same time, when one of the above three cases occurs, the intersection D2 of the aforementioned landslide path t and the river is taken as the position of the blocking point, and the blocking point warning is issued, i.e. the first-level blocking river warning.

[0078] Step S400: According to the water level signal, the danger of landslide damming backwater and flood is evaluated, and a flood warning corresponding to the danger level of landslide damming backwater and flood is issued.

[0079] For step S400, the danger of dammed lake flood is determined according to the water level fluctuation amplitude, and different level warning information is issued. If it is evaluated that the landslide cannot reach the near shore of the main ditch, the fourth-level blocking river warning is issued; if it is evaluated that the landslide can reach the near shore but cannot reach the far shore, the third-level blocking river warning is issued; if it is evaluated that the landslide can reach the far shore but the distance is less than the limit river width, the second-level blocking river warning is issued; if it is evaluated that the landslide distance is greater than the limit river width, the first-level blocking river warning is issued.

[0080] For the above case one:

[0081] If the warning center monitors that the water level monitored by the downstream sensor decreases by more than 1.2 times the fluctuation amplitude within a unit monitoring time, the warning center issues a fourth-level warning information;

[0082] If the warning center monitors that the water level monitored by the downstream sensor decreases by more than 1.5 times the fluctuation amplitude within a unit monitoring time, the warning center issues a third-level warning information;

[0083] If the warning center monitors that the water level monitored by the downstream sensor decreases by more than 2 times the fluctuation amplitude within a unit monitoring time, the warning center issues a second-level blocking river warning information;

[0084] If the warning center monitors that the water level monitored by the downstream sensor decreases to a stable water level and the duration is more than a unit monitoring time, the warning center issues a first-level blocking river warning information; and,

[0085] If the warning center monitors that the water level monitored by the downstream sensor rises suddenly after falling and then falls to a stable water level, and the stable water level lasts for at least two unit monitoring times, the warning center cancels the warning information.

[0086] For the above case two:

[0087] If the early warning center monitors that the water level monitored by the upstream sensor decreases by more than 1.2 times the fluctuation amplitude within a unit monitoring duration, the early warning center issues a fourth-level early warning information;

[0088] If the early warning center monitors that the water level monitored by the upstream sensor decreases by more than 1.5 times the fluctuation amplitude within a unit monitoring duration, the early warning center issues a third-level early warning information;

[0089] If the early warning center monitors that the water level monitored by the upstream sensor decreases by more than 2 times the fluctuation amplitude within a unit monitoring duration, the early warning center issues a second-level early warning of river blockage;

[0090] If the early warning center monitors that the water level monitored by the upstream sensor decreases to a stable water level and the duration exceeds a unit monitoring duration, the early warning center issues a first-level early warning of river blockage; and,

[0091] If the water level monitored by the upstream sensor decreases and then suddenly increases and then decreases to a stable water level, and the stable water level lasts for at least two unit monitoring durations, the early warning center cancels the early warning information.

[0092] For the third case described above:

[0093] If the early warning center monitors that the water level monitored by the downstream sensor increases by more than 1.2 times the fluctuation amplitude within a unit monitoring duration, the early warning center issues a fourth-level early warning information;

[0094] If the early warning center monitors that the water level monitored by the downstream sensor increases by more than 1.5 times the fluctuation amplitude within a unit monitoring duration, the early warning center issues a third-level early warning information;

[0095] If the early warning center monitors that the water level monitored by the downstream sensor increases by more than 2 times the fluctuation amplitude within a unit monitoring duration, the early warning center issues a second-level early warning information of river blockage;

[0096] If the early warning center monitors that the water level monitored by the downstream sensor increases to a stable water level, the early warning center issues a first-level early warning information of river blockage; and,

[0097] If the early warning center monitors that the water level monitored by the downstream sensor increases and then decreases to a stable water level and lasts for at least two unit monitoring durations, the early warning center cancels the early warning information.

[0098] The embodiment of the present application also provides a landslide damming disaster chain cooperative early warning system for implementing the landslide damming disaster chain cooperative early warning method of any one of the preceding. The landslide damming disaster chain cooperative early warning system comprises a collection module, a processing module and a release module; the collection module is used for acquiring landslide shock signals and water level signals, the processing module is used for obtaining time and position information of landslide occurrence according to the landslide shock signals, and the release module is used for releasing large landslide warning; the processing module is also used for evaluating the possibility of blocking a river caused by the landslide according to the spatial relationship between the landslide and the river system; the release module is also used for releasing a secondary warning of river blocking if the landslide has the possibility of causing the river blocking; the processing module is also used for judging whether the river blocking has occurred in combination with the water level signals; the release module is also used for releasing a primary warning of river blocking if it is judged that the river blocking has occurred; the processing module is also used for positioning the river blocking point according to the spatial relationship between the landslide and the river system if it is judged that the river blocking has occurred; the processing module is also used for evaluating the danger of landslide damming backwater and flood breaking according to the water level signals; and the release module is also used for releasing a flood warning of a corresponding level of the danger of landslide damming backwater and flood breaking.

[0099] The landslide damming disaster chain cooperative early warning method and system provided by the present application: in the past, the landslide damming disaster chain mainly relied on local residents to identify and report, and it was difficult to report to the emergency management department at the beginning of the event, which might miss the valuable response opportunity. The analysis method and system provided by the embodiment of the present application for landslide damming disaster chain disaster identification and early warning are helpful to timely and accurately identify each link of the disaster chain, and are particularly suitable for disaster chain early warning analysis in unpopulated areas; the embodiment of the present application provides a solution for damming point identification and disaster chain early warning by combining the cooperative analysis of landslide shock signals and river water level signals, and provides technical support for more accurate emergency response.

[0100] It should be noted that in this document, the terms "comprising", "containing", or any other variant thereof are intended to cover non-exclusive inclusions, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such a process, method, article or device. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of another identical element in the process, method, article or device comprising the element.

[0101] Although the present application is disclosed as above, the present application is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, and therefore the protection scope of the present application should be subject to the scope defined by the claims.

Claims

1. A collaborative early warning method for landslide and dammed disaster chains, characterized in that: Real-time reception of landslide signals and water level signals, wherein the landslide signal refers to the low-frequency vibration signal generated during the occurrence of a large landslide, and the water level signal refers to the sensing signal generated when the river water level changes; the low-frequency vibration signal is acquired by a vibration acquisition device, which includes a broadband seismograph; the water level signal is acquired by a water level sensor, which includes an ultrasonic water level meter; the collaborative early warning steps include: S01. When a landslide signal is received, the time and location information of the large landslide are analyzed based on the landslide signal, and a large landslide alarm is issued; S02. Based on the spatial relationship between the landslide and the river system, assess and predict the possibility of the landslide causing river blockage; if the landslide has the possibility of causing river blockage, issue a level II warning for river blockage. S03. When a sudden change in water level occurs after a landslide signal, the landslide signal and the sudden change in water level are combined to determine whether a blockage has occurred in the river. If a blockage has occurred, a Level I warning for the blockage is issued, and the location of the blockage point is determined based on the spatial relationship between the landslide and the river system. S04. Based on the subsequent water level signals, further assess the danger of landslide damming backwater and outburst flood, and issue flood warnings at levels corresponding to the danger of landslide damming backwater and outburst flood; Step S02 specifically includes: The elevation coordinates Z of the landslide location are obtained by interpolation based on the horizontal and vertical coordinates of the large landslide location and the nearby topographic contour lines. Assuming the volume of a large landslide is V, the apparent friction coefficient c is obtained by converting it according to the functional relationship between volume and apparent friction coefficient c = c(V); Identify the gully bed or sliding bed direction line below the landslide point until the direction line intersects with the river channel line. Count the direction line between landslide point D1 and intersection point D2 as the river blocking path t, and read the coordinates of point D2. Calculate the tangent value c(t) = tan(arcsin(ΔH / ΔL)) based on the elevation difference ΔH between the first and last points of the path and the path length ΔL. The likelihood of blocking the river is determined by the magnitudes of c and c(t). When c is less than c(t), the apparent friction coefficient of the landslide body is smaller, the runoff distance is larger, and the likelihood of blocking the river is greater; conversely, the likelihood of blocking the river is smaller. When there is a high probability of landslide blocking the river, a Level II landslide blocking warning will be issued, and landslide blocking warning response work will be carried out.

2. The method for collaborative early warning of landslide and dammed disaster chains according to claim 1, characterized in that, In the step of receiving the slippage signal and the water level signal in real time, the slippage signal includes three or more sets of low-frequency vibration signals from different directions, and the water level signal includes two or more sets.

3. The method for collaborative early warning of landslide and dammed disaster chains according to claim 2, characterized in that, In the step of analyzing the landslide signal to obtain the time and location information of the large landslide and issuing a large landslide alarm, assuming the signal arrival time Ti recorded by the vibration collector Ei, the horizontal coordinate Xi and the vertical coordinate Yi of the vibration collector point, and the signal velocity V, the source location (X, Y) and the time of occurrence T are solved. Then, V(Ti-T) = S((Xi-X), (Yi-Y)). Using three or more sets of vibration collector signals, the source location (X, Y) and the time of occurrence T are determined through numerical iterative analysis.

4. The method for collaborative early warning of landslide and dammed disaster chains according to claim 1, characterized in that, In step S03, when a sudden change in water level occurs after a landslide signal, the landslide signal and the sudden change in water level are combined to determine whether a blockage has occurred in the river. If a blockage has occurred, a Level I warning for the blockage is issued, and the blockage point is located based on the spatial relationship between the landslide and the river system. If the water level monitored by the downstream sensor in the water level sensor group drops while the water level monitored by the upstream sensor rises, a dam is determined to have occurred between the water level sensor groups, and the intersection point D2 is taken as the blockage point location, and a Level I warning for the blockage is issued. If the water level monitored by the water level sensor group all drops and the water level monitored by the upstream sensor drops before the water level monitored by the downstream sensor, it is determined that a blockage has occurred upstream of the water level sensor group, and the intersection point D2 is taken as the location of the blockage point, and the first-level warning of the blockage is issued. If the water levels monitored by the water level sensor group all rise and the water level monitored by the downstream sensor rises before the water level monitored by the upstream sensor, it is determined that a dam has occurred downstream of the water level sensor group, and the intersection point D2 is taken as the location of the damming point, and a level one warning for the damming point is issued.

5. The method for collaborative early warning of landslide and dammed disaster chains according to claim 4, characterized in that, In the step of determining that a dam has occurred between the water level sensor groups when the water level monitored by the downstream sensor in the water level sensor group drops and the water level monitored by the upstream sensor rises, and taking the intersection point D2 as the location of the dammed river, a level-one warning for the dammed river is issued: If the early warning center detects that the water level monitored by downstream sensors drops by more than 1.2 times the fluctuation range within a unit monitoring time, the early warning center will issue a Level IV early warning. If the early warning center detects that the water level monitored by downstream sensors drops by more than 1.5 times within a unit monitoring period, the early warning center will issue a Level III early warning. If the early warning center detects that the water level monitored by downstream sensors drops by more than twice the fluctuation range within a unit monitoring time, the early warning center will issue a level II early warning for river blockage. If the early warning center detects that the water level monitored by downstream sensors has dropped to a stable level and the duration exceeds one unit of monitoring time, the early warning center will issue a Level I warning for river blockage. as well as, If the early warning center detects that the water level monitored by the downstream sensor drops, then suddenly rises and then drops to a stable level, and the stable water level lasts for at least two monitoring periods, the early warning center will lift the early warning information.

6. The method for collaborative early warning of landslide and dammed disaster chains according to claim 4, characterized in that, If the water level monitored by the water level sensor group all drops, and the water level monitored by the upstream sensor drops before the water level monitored by the downstream sensor, then it is determined that a blockage has occurred upstream of the water level sensor group, and the intersection point D2 is taken as the location of the blockage point, and the first-level warning for the blockage is issued: If the early warning center detects that the water level monitored by the upstream sensor drops by more than 1.2 times the fluctuation range within a unit monitoring time, the early warning center will issue a level four early warning. If the early warning center detects that the water level monitored by the upstream sensor drops by more than 1.5 times the fluctuation range within a unit monitoring time, the early warning center will issue a Level III early warning. If the early warning center detects that the water level monitored by the upstream sensors drops by more than twice the fluctuation range within a unit monitoring time, the early warning center will issue a level II warning for river blockage. If the early warning center detects that the water level monitored by upstream sensors has dropped to a stable level and this drop continues for more than one unit of monitoring time, the early warning center will issue a Level I warning for river blockage; and, If the water level monitored by the upstream sensor drops, then suddenly rises and then drops to a stable level, and the stable water level lasts for at least two monitoring periods, the early warning center will cancel the early warning information.

7. The method for collaborative early warning of landslide and dammed disaster chains according to claim 4, characterized in that, If the water levels monitored by the water level sensor group all rise, and the water level monitored by the downstream sensor rises before the water level monitored by the upstream sensor, then it is determined that a dam has occurred downstream of the water level sensor group. The intersection point D2 is then designated as the damming point, and a Level 1 damming warning is issued. If the early warning center detects that the water level monitored by the downstream sensors rises by more than 1.2 times the fluctuation range within a unit monitoring time, the early warning center will issue a level four early warning. If the early warning center detects that the water level monitored by downstream sensors rises by more than 1.5 times within a unit monitoring period, the early warning center will issue a Level III early warning. If the early warning center detects that the water level monitored by downstream sensors rises by more than twice the fluctuation range within a unit monitoring time, the early warning center will issue a level II early warning for river blockage. If the early warning center detects that the water level at the downstream sensor has risen to a stable level, the early warning center will issue a Level I warning for river blockage. as well as, If the early warning center detects that the water level monitored by the downstream sensor rises and then falls to a stable level and continues for at least two unit monitoring periods, the early warning center will lift the early warning information.

8. The method for collaborative early warning of landslide and dammed disaster chains according to claim 1, characterized in that, In the step of further assessing the danger of landslide damming backwater and outburst flood based on the subsequent water level signals, and issuing flood warnings at levels corresponding to the danger of landslide damming backwater and outburst flood, if it is assessed that the landslide overflow cannot reach the near bank of the main channel, a Level IV warning for blocking the river is issued; if it is assessed that the landslide overflow can reach the near bank but not the far bank, a Level III warning for blocking the river is issued; if it is assessed that the landslide overflow can reach the far bank, but the distance beyond is less than the boundary river width, a Level II warning for blocking the river is issued; if it is assessed that the landslide overflow distance is greater than the boundary river width, a Level I warning for blocking the river is issued.

9. A collaborative early warning system for landslide and dammed disaster chains, used to implement the collaborative early warning method for landslide and dammed disaster chains as described in any one of claims 1-8, characterized in that, The landslide and damming disaster chain collaborative early warning system includes a data acquisition module, a processing module, and a publishing module; The acquisition module is used to acquire the slippage signal and the water level signal, and send the signal to the processing module. It includes a vibration acquisition device for acquiring low-frequency vibration signals and a water level sensor for acquiring water level signals. The vibration acquisition device includes a broadband seismograph, and the water level sensor includes an ultrasonic water level meter. The processing module is used to analyze the landslide signal to obtain the time and location information of the large landslide, assess the possibility of the landslide causing river blockage based on the spatial relationship between the landslide and the river system, and publish the judgment result through the publishing module. If the landslide has the possibility of causing river blockage, it is judged as a level II warning for river blockage. When a sudden change in water level occurs after a landslide signal, the processing module combines the landslide signal and the sudden change in water level signal to determine whether a blockage has occurred. If a blockage has occurred, the processing module issues a Level 1 warning for a blockage and sends it to the issuing module. The issuing module is used to issue a large landslide alarm based on the judgment of the processing module. If the landslide has the potential to cause river blockage, a level II river blockage warning is issued. If it is determined that river blockage has already occurred, a level I river blockage warning is issued. The processing module is also used to locate the river blockage point based on the spatial relationship between the landslide and the river system if it is determined that river blockage has already occurred. The processing module is also used to assess the risk of backwater from landslide damming and outburst floods based on the water level signal; the publishing module is also used to issue flood warnings corresponding to the risk levels of backwater from landslide damming and outburst floods.

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