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龙卷风自然灾害英语作文
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龙卷风用英语怎么读
The tornado is a 涡旋 ： dragon air around the shaft to rotate rapidly, by a tornado center pressure was reduced to attract, dozens of a thin layer of air currents from all sides, by inhalation 涡旋 bottom. and then into the vortex of 轴心, the strong wind always cyclones, the centre of pressure around 10% lower than the pressure.
The atmosphere of instability have a strong rising air currents, the current in the flow of traffic, it was further strengthened
In a vertical, horizontal with the speed and direction are never get wind of interaction, rising air currents in the troposphere central began to revolve, forming scale necessitated
With the scale necessitated to the development and progress, itself became fine and strengthened. meanwhile, a small area of increased support to that of the dragon born in the form, cyclones necessitated the same process and the formation of a tornado core
A tornado's whirling core and cyclones in, it was strong enough to make a tornado to the ground. when development reached the surface pressure, the ground with a sharp rise to form strom
关于龙卷风的英文介绍简短
Tornado is a vortex: the air around the tornado's axis rapid rotation, very central pressure decreases by tornadoes attracted tens of meters thick near the surface of a thin layer of air, the air was inhaled from all over the bottom of the vortex. And then up into the vortex around the axis, tornadoes in the wind is always cyclonic, and its center of pressure can be 10 percent lower than the surrounding air pressure.
Tornadoes are associated with high-speed rotation of the funnel-shaped cloud of strong wind vortex. Tornado wind speed near the center up to 100m / s ~ 200m / s, maximum 300m / s, than the maximum wind speed near the center of typhoon good times. Central pressure is very low, as low as 400hPa, the lowest up to 200hPa. It has great sucking effect, can the sea (lake) water suction from the sea (lake) side to form a water column, and then connecting with the cloud, commonly known as "Dragon water." As the tornado is extremely thin internal air, and the temperature rapidly decreases, water vapor quickly condenses, forming funnel cloud is an important reason. Funnel cloud diameter, the average is only about 250m. Instability resulting from a strong tornado in cumulonimbus. Its formation was strongly increased with the warm air, cold air south, the terrain effects, and so on. Its life history is short, the general maintenance of 10 minutes to 12 hours, but its amazing destructive power, able to uproot trees, buildings blown down, or the part of the surface material to air volume. Jiangsu Province, nearly all tornadoes occur each year, but the place where there is no obvious rule. Occurs, usually six to seven, sometimes in August, the middle.
The formation of a tornado
A tornado is a product of thunderstorm clouds. Specifically, a huge thunderstorm tornado is a small part of the energy in a small area in a concentrated form of release. Tornado formation can be divided into four phases:
(1) the instability of the atmosphere produced a strong updraft, due to the largest rapids in the flow of transit, it was further strengthened.
(2) Since the vertical direction with the speed and direction are the interaction of wind shear, increased airflow in the middle troposphere begin rotating, the formation of mesoscale cyclones.
(3) With the development of mesoscale cyclones in the ground and up to stretch, and strengthen its own thinner. Meanwhile, a small area of enhanced counseling together, that is born within the cyclone formation of tornadoes, cyclones generated in the same process, forming a tornado core.
(4), tornadoes and cyclones in the core of the Rotary's different, because it is strong enough to make tornadoes has been extended to the ground. When the development of the vortex to reach ground level, the sharp decline in surface pressure, surface wind speed increased rapidly to form a tornado.
Tornadoes often occur in summer lightning storm, the most common especially in the afternoon to evening. Attack range of small diameter cyclones typically between 10 meters to several meters. Tornado survival time to only a few minutes, more than a few hours. Wind particularly in wind speed near the center of up to 100-200 m / sec. Extremely destructive, tornado through the place, often occur uprooted trees, overturned cars, destroyed buildings and other phenomena, sometimes people take away a very serious hazard
龙卷风有哪些危害及防治方法
龙卷风好看但却是一种非常危险的自然灾害。它能够在瞬间消灭陆地上存在的所有东西。1995年在美国俄克拉何马州阿得莫尔市发生了一场陆龙卷，诸如屋顶之类的重物被吹出几十英里之远。大多数碎片落在陆龙卷通道的左侧，按重量不等常常有很明确的降落地带。较轻的碎片可能会飞到300多千米外才落地。
在1999年5月27日，美国得克萨斯州中部，包括首府奥斯汀在内的4个县遭受特大龙卷风袭击，造成至少32人死亡，数十人受伤。据报道，在离奥斯汀市北部40英里的贾雷尔镇，有50多所房屋倒塌，已有30多人在龙卷风丧生。遭到破坏的地区长达1英里，宽200码。这是继5月13日迈阿密市遭龙卷风袭击之后，美国又一遭受龙卷风的袭击。
强烈不稳定的积雨云中才会产生龙卷风，它的形成与暖湿空气强烈上升、冷空气南下、地形作用等有关。龙卷风一种很强的小范围旋风，一般在几十米到几百米之间。不过龙卷风的维持时间从几分钟到几十分钟，最多时不会超过几小时。但由于它是一种高速旋转体，中心气压极低，风力很大，虽然影响范围虽小，但它的破坏力极强。在龙卷风经过的地方，往往成片庄稼、成万株果木被其瞬间摧毁，还会拔起大树、掀翻车辆、摧毁建筑物等现象或把部分地面物卷至空中，有时把人吸走所以。因此，龙卷风是一种严重的灾害性天气。
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