Flush flood and debris flow warning method based on pore water pressure monitoring

Abstract

The invention discloses a flush flood and debris flow warning method based on pore water pressure monitoring. The method comprises the steps that the location of a monitoring point is determined, and a pore water pressure sensor is resettled; a series of monitored pore water pressure Pc is converted into a mud bit; the flow QJ of a corresponding monitoring point is calculated, and a curve of the relationship between Pc and QJ is established; the flow Q*J of the monitoring point and the flow Q*B of the location of a protected object under different rainfall conditions are respectively calculated; according to a curve of the relationship between Q*J and Q*B, the flow QY of a monitoring point corresponding to protection standard flow is determined; according to the curve of the relationship between Pc and QJ, the pore water pressure corresponding to QY is determined as red warning pressure Pred, and the pore water pressure corresponding to 0.75QY is determined as yellow warning pressure Pyellow; when actual warning is carried out, the actually measured pore water pressure which is monitored in real time is compared with Pred and Pyellow, and warning information is issued. According to the method, disaster prevention warning information and disaster prompt warning information are respectively provided according to different situations, and the method has the advantages of high reliability and accuracy.

Description

technical field [0001] The invention relates to a method for early warning of torrent and mud-rock flow, in particular to a method for early warning of torrent and mud-rock flow based on pore water pressure monitoring. Background technique [0002] Mountain torrents and debris flow disasters are one of the main types of mountain disasters in my country, causing heavy casualties and property losses every year. Monitoring and early warning is an important measure to reduce casualties caused by torrents and debris flows. With the development of the mountainous economy and the deepening of the western development, the demand for monitoring and early warning of mountain torrents and debris flows is becoming more and more vigorous. [0003] At present, the monitoring and early warning methods of debris flow at home and abroad are mainly based on rainfall monitoring, ground acoustic monitoring, ultrasonic mud level monitoring, infrared mud level monitoring, disconnected mud level m...

AI Technical Summary

Problems solved by technology

Rainfall monitoring and early warning uses automatic rain gauges to monitor the rainfall process in debris flow formation areas, and uses the 10-minute rain intensity model and 30-minute rain intensity model that trigger debris flows to calculate critical thresholds and issue early warning information, but this method has a high false alarm rate

Ultrasonic mud level monitoring and early warning is to use ultrasonic to detect the real-time mud level height, compare it with the height of the ditch bed before the debris flow erupts to calculate the thickness of the debris flow, and then determine the flow rate of the debris flow. , the debris flow obtained by this method is too large, which may cause false positives

There are two forms of infrared mud level monitoring and early warning. One is similar to the ultrasonic mud level monitoring and early warning method. Infrared rays are emitted downward from directly above the ditch to monitor the height of the mud level of the mud-rock flow. The other is from one side of the ditch to the other. One side emits a group of infrared rays at equal intervals, and uses the position where the debris flow blocks the infrared rays to determine the height of the mud level; both methods have the problem that the determined flow rate is too large due to the phenomenon of debris flow splashing

The broken line mud level monitoring and early warning is to erect several cables on the debris flow channel and connect the electrical signal, and use the interruption of the electrical signal of the debris flow to break the cable to judge the height of the mud level, and then issue an early warning. This method may have insufficient impact of the debris flow The judged mud level is too small due to the unbroken cable, which makes the downstream face danger and is not found. There is also a certain distance between the cables, which makes the judgment error. Cannot be alerted again

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