Experimental Researched On The Function Of Debris Flow Monitoring And Early Warning System

Debris flow disaster is distributed in all over the world.China's debris flow break out frequently.According to incomplete statistics,the 20 th century 50 to 80 s,the national debris flow kill million people,direct economic losses of it is more than 100 billion yuan.Most of the existing debris flow monitoring and early warning systemt is expensive and not suitable for a large number of layout.Most areas of debris flow monitoring means mainly manual monitoring and critical rainfall threshold forecast,this method is difficult to ensure its efficiency and accuracy.In this paper,a method of monitoring and monitoring of debris flow for most of the debris flow area is designed by using the method of rainfall-displacement joint monitoring,and some functional experiments are carried out.Debris flow monitoring and early warning system consists of "data acquisition","network transmission","control and early warning" and "auxiliary" four subsystems.The scheme which regard two base stations as the center,the monitoring nodes are regular hexagon,is designed by the formation of debris flow.The node in the debris flow area is set up to verify it.In view of the possibility of monitoring data loss,another scheme designed to form a secondary base station at the boundary is designed.In order to ensure the accuracy of the monitoring node displacement,the GPS differential algorithm precision test experiment is carried out.The experimental results show that the accuracy is greatly improved and the accuracy requirement of the debris flow monitoring and early warning system is satisfied.In order to ensure the validity and displacement of the monitoring data transmission,the debris flow displacement simulation experiment was carried out by using the integrated monitoring node.The experimental results show that the monitoring point information is clearly displayed on the MainWindow software,and the data transmission is timely and effective.In order to ensure the accuracy of the measured rainfall,the error experiment of rainfall and installation height is carried out for the influence factors of the installation height on the error of the rain gauge.The relationship between the rainfall intensity and the rainfall measurement error is summarized.And rainfall statistics are corrected in the control and early warning system.According to the actual situation of the debris flow disaster area,the rainfall threshold is calculated by the method of "example method","frequency method" and "storm flood method".In view of the serious lack of disaster data,the "analogy analysis method" and "starting mechanism method" for rainfall threshold calculation to Shi Jiagou is regard as an example to illustrate.According to the function of the control early warning subsystem,the function of displaying and storing the monitoring point information by MainWindow software is studied.In response to the rainfall error experiment,rainfall statistics correction was carried out in this subsystem.And the accuracy of the effective rainfall is improved by modifying the existing effective rainfall calculation formula.