Ultrasonic Anemometers for Transportation
Application Guide – Marine | Road | Rail | Airport
Application Guide – Marine | Road | Rail | Airport
Meteorology has a great impact on traffic safety, so meteorological monitoring stations are particularly important.
Ultrasonic anemometer is an important part of monitoring station, and also plays an important role.
Let’s start with the impact of weather on traffic.
According to statistics from the traffic control department, nearly 30% of traffic accidents occur under bad weather conditions.
Low visibility, fog, ice, water accumulation, snow, high temperature, gale, dust storm, drought, frost and other weather and geological disasters secondary to rainstorm, such as floods, debris flows, landslides, are the main disastrous weather affecting traffic safety.
Today, we will have a detailed understanding of the impact of meteorological disasters on traffic.
According to the investigation and analysis, the main meteorological disasters affecting traffic safety are low visibility, precipitation (rain and snow), snow, ice and gale.
Low visibility is the main meteorological disaster affecting traffic, and the level of visibility has a direct impact on traffic safety.
Low visibility weather often causes highway blockage and road closure, which directly leads to traffic disruption. Due to the influence of fog, there are even several dozen to hundreds of vehicles colliding in a series on the highway, causing huge economic losses and casualties.
Because of the network of expressways, the closure of some highways often leads to traffic jams or even traffic paralysis in other highways or surrounding small towns.
In addition, the serious traffic accidents caused by low visibility are shocking. According to statistics, traffic accidents on expressways caused by heavy fog account for about 1/4 of the total number of accidents, and the accident rate on expressways in foggy days is 10 times that of normal ones.
Fog, precipitation (rain, snow, etc.), air humidity, atmospheric dust and smoke are the key factors affecting visibility. Thick fog decreases horizontal visibility, and the average horizontal visibility distance is less than 1 km, or even less than 200 m. For trains, there must be 800 m taxiing distance from braking to stopping, so if the train does not decelerate in fog, accidents will occur easily.
Low visibility also has a great impact on transport by sea. When visibility is less than 1500m, the navigation of ships will be affected, and many ports will be closed.
In addition, low visibility has a considerable impact on the take-off and landing of aircraft. Poor visibility on the ground can easily lead to yaw and stray. When landing, it will affect the safe landing, and improper handling will also endanger flight safety.
When the visibility of the airport is less than 350 meters, flights cannot take off, and flights cannot land when the visibility is less than 500 meters. If the visibility is less than 50 meters, the aircraft can not even glide, and improper handling can easily lead to flight accidents. In the history of international aviation, there have been serious consequences of aircraft taxiing collision in fog.
The frictional coefficient of pavement is directly affected by the weather phenomena such as freezing and snow caused by low temperature. Ice and snow on the road surface will greatly reduce the friction coefficient of the road surface and increase the safe braking distance of motor vehicles.
Bridge or tuyere sections are liable to freeze because of the rapid cooling, and motor vehicles are liable to cause traffic accidents when passing through these roads from the normal road surface.
Snow cover, avalanche, snowfall and other snow hazards also have a great impact on Railway traffic, mainly in the following aspects: snow cover rails, slippery pavement, reduced visibility, affecting train speed, causing train delays, and even causing train subversion. When snow cover exceeds 70 cm, it will cause snow blockage and traffic interruption. In addition, the frozen soil caused by low temperature may cause the deformation of railway subgrade.
The freezing of rivers caused by low temperature also directly affects shipping.
In addition, the weather that has the greatest impact on aviation safety in winter is freezing rain and snow, including ice grains, snow and sleet.
After takeoff, there is snow or ice on the wing surface, the airflow is easy to separate, the lift required for the aircraft to float in the air will decrease, and the ice on the wing may hinder the aircraft’s control system, even if the aircraft flies, it will be in an unstable state.
If there is a large amount of ice on the wing, the drag will increase, the lift will decrease, leading to stall and deformation, which may lead to the failure of aircraft control.
Therefore, once it is confirmed that there is frost or snow on the wing surface, or ice caused by low temperature, deicing operations must be carried out.
Strong convective weather such as gale and hail will also have a greater impact on traffic. Gale will cause serious damage to buildings and transportation facilities. Vehicles are overturned by gale from time to time. Vehicle driving ability in the wind and tire grip ability are obviously weakened.
According to the theory of wind pressure, the wind force is proportional to the square of wind speed and the wind area. When the wide side of the car body is exposed to wind, the force is the greatest. When the wind speed is more than 12 m/s, the steering wheel is easy to fail and the speed should be slowed down. The critical value of wind speed causing road accidents is usually 15 m/s, and the corresponding gust can reach 22 m/s. If accompanied by rainfall, the car is more difficult to control.
Strong wind can harm railway, bridge, communication and power facilities, blow down road trees, block traffic, wind erosion roadbed, sand blowing, reduce visibility, and directly harm trains, slow down train speed, and even overturn trains
The impact of gale on maritime transport is particularly obvious, especially in open areas. Ships do not have time to enter the shelter area, which often results in serious accidents such as overturning of ships by the wind. Hail can also cause damage to motor vehicles and road traffic facilities, but often hail occurs in a smaller range and has a shorter impact time than other weather phenomena. Thunderstorms also threaten the safety of transportation facilities and bridges.
Wind impact on aviation: Ground wind will directly affect the aircraft’s control, and high-altitude wind will affect the aircraft’s flight speed and fuel volume on the route.
Wind shear has a great impact on aviation. Wind shear is an atmospheric phenomenon, which refers to the abrupt change of wind direction and speed in short distance. Low-altitude wind shear is a serious threat to take-off and landing of aircraft.
Strong wind shear moments can cause aircraft to fly prematurely or forcibly. Under certain conditions, it can also lead to aircraft stall and the danger of difficult to control, and even lead to flight accidents.
Because the mechanical three-cup anemometer is the most common and the cost is low, it is mainly used on transmission lines at present, but with the deepening of the application, more and more drawbacks are reflected.
The following will be shown by comparing the tables one by one.
|3-Cup Anemometer||Ultrasonic Anemometer|
|Volume & Weight||Normall||Small size and light weight|
|Maintainability||Regular maintenance and replacement of components||Free-Maintaince|
|Accuracy||Instable||High accuracy and sensitivity|
|Starting Velocity||At least 0.5m/s||Start-up wind speed is small, 0.1m/s|
|Heating Function||No||Yes. Outdoor use in winter|
|Life||1 Year||No moving parts, long life 5 Years|
|Price||High cost performance||More expensive than mechanical ones.|
|Notes||Operating at high altitude(Up to 60 meters), maintenance service fee is at least $1000||No additional cost|
Anemometer for Sale!
We are a supplier of ultrasonic anemometers from China. A group of young team engaged in innovative design of meteorological instruments, especially ultrasonic monitoring instruments, while providing customized development services.
Would you need any ultrasonic anemometer suggestion service?
Send an email to:
China Office Tel:
US Office Tel:
+1 (209) 890-8816