At around 17:00 on March 15, a forest fire broke out near Baizi Village, Xiala Town, Yajiang County, Garze Tibetan Autonomous Prefecture, Sichuan Province. After receiving the order from superiors, Radium Test Chuangxin immediately formed an emergency support working group, cooperated with the expert team of the Emergency Management Department and the China Meteorological Administration, and quickly arrived at the scene with two Doppler wind lidars to overcome complex terrain obstruction and observation conditions. It can realize real-time monitoring of three-dimensional wind fields, low-altitude jet streams, smoke plume dispersion, atmospheric boundary layer and other information, and combine it with AI models to predict future meteorological information of fire fields and carry out system-level emergency meteorological support services.
The spread of forest fires is mainly controlled by valley winds. It is three-dimensional in nature and often develops in leaps and bounds. Complex mountainous areas usually have changeable topography and landforms, such as mountains, canyons, dramatic changes in slope and altitude, etc. These factors will affect meteorological conditions. At the same time, complex mountainous areas are often affected by a variety of meteorological systems, such as monsoons, high-pressure systems, low-pressure systems, etc. The interaction of these systems results in variable meteorological conditions and increases the uncertainty of forecasts. How to identify and warn at the early stage of fire formation and conduct three-dimensional monitoring of fire development paths and fire mutations are the key points of forest fire prevention and control.
Figure 2. Schematic diagram of complex meteorological fields in mountainous areas
Fire is the order! Under the unified command of the National Work Safety Emergency Rescue Survey Team, the Laser Testing and Creation Team was continuously on duty at the Yajiang fire scene. The three-dimensional scanning wind lidar and boundary layer profile wind lidar they carried were on the 2nd and 3rd. Carry out motorized remote sensing observation at the fire scene, obtain the meteorological conditions in the fire scene area and quantitatively evaluate them in real time, distinguish smoke, clouds, fog, dust, etc. in and around the fire scene in real time, providing a full range of Three-dimensional monitoring can quickly obtain the specific location of the fire point, meteorological information, burning intensity and other data, more accurately predict the direction and speed of fire development, provide scientific basis for fire emergency response, help optimize the allocation of fire-fighting resources, and provide on-site mountain fire The rapid response and decision-making of the firefighting command provide effective equipment and data support to ensure the smooth development of rescue work and the personal safety of the rescue team.
Figure 3. On-site support members of the National Work Safety Emergency Rescue Survey Team
As of 15:00 on March 26, with the full efforts of the on-site rescue team, there was no open fire at the Yajiang County forest fire scene. After joint discussion and judgment by the command headquarters, the fire scene has fully entered the cleaning and guarding stage, and some fire-fighting teams are in an orderly manner as arranged. Evacuate and return to construction.
The three-dimensional scanning wind lidar, boundary layer profile lidar and vehicle-mounted and drone-mounted wind lidar developed by Leichuangxin have played an important role in emergency meteorological support for many forest fire rescues in China. After continuous actual combat drills and application iterations, a systematic solution has been formed, and the reliability of relevant equipment and data validity have been fully verified.
