Drought Causes Effects And Prevention Pdf

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If you create an account, you can set up a personal learning profile on the site. Can you suggest why a climate which is gradually becoming warmer will result in an increase in the risk of droughts?

What is a drought? Its impacts result from the interplay between the natural event less precipitation than expected and the demand people place on water supply, and human activities can exacerbate the impacts of drought. What causes a drought? Drought has many causes. It can be caused by not receiving rain or snow over a period of time.

What causes drought?

A drought is a prolonged period with less-than-average amounts of rain or snow in a particular region. The severity of the drought depends on the amount of time that a region receives below-average precipitation. This is called a flash drought. A drought is caused by drier than normal conditions that can eventually lead to water supply problems. Really hot temperatures can make a drought worse by causing moisture to evaporate from the soil. Just because a region is hot and dry doesn't necessarily mean it is going through a drought.

Droughts only occur when an area is abnormally dry. Here's why:. Some regions are routinely wet and others are routinely dry. From season to season — and from year to year — the amount of rain or snow in a location can vary. However, over a period of many years, the average amount of precipitation in a region is fairly consistent.

For example, in the deserts of the American Southwest, the average precipitation is less than 3 inches per year. But, the average yearly precipitation in Atlanta is about 50 inches.

When a particular area gets less rain than usual, the soil gets much less moisture, too. The soil starts drying out and plants die. When this pattern continues for several weeks, months or years, the flow of streams and rivers decreases and water levels in lakes, reservoirs and wells fall. Eventually, the unusual dry weather causes water supply issues, and the dry period becomes a drought.

Two men examine roots of alfalfa and grass hay hit by drought in Sidney, Montana. Yes and no. A light rain shower might cause the grass and plants to green up. A thunderstorm can bring lots of rain into a region, but often the rain comes so quickly that it goes into sewers and ditches instead of soaking into the soil. In fact, if a thunderstorm suddenly hits a region experiencing drought, it can cause a flash flood.

If a thunderstorm hits during a drought, the rain can come too fast to be absorbed by the soil and the water may just end up going down a storm drain. Credit: Public Domain. The only way a drought can really end is with enough regular soaking rains or significant snow. Rains that soak into the soil can replenish the groundwater.

Groundwater provides water to plants and can refill streams during non-rainy periods. One soaking rain may help improve drought conditions. However, multiple soaking rains over several months are needed to truly return things to normal. One way to monitor droughts is from weather satellites in space. For example, satellite data was used to develop a tool that alerts farmers about upcoming flash droughts.

This information can be used to estimate evapotranspiration, which is a measure of how much water is being transferred from the land to the atmosphere through the soil and plants. By comparing the weekly evapotranspiration data from satellites with the average for the region, scientists can predict whether or not a region is at risk for flash droughts — and give warnings to farmers and ranchers if crops will soon be under stress.

Red and brown colors indicate extreme moisture stress. Credit: USDA. Scientists can also look at tree rings from trees that are hundreds of years old.

The thickness of tree rings can tell scientists about historical droughts over the hundreds of years of a tree's life. You may have heard of using tree rings to learn about the past, but what are scientists looking for? There is information in the thickness of each ring. Thick rings mean the tree was able to grow faster due to plentiful water, indicating a wetter year.

They can just insert a hollow drill into the trunk and pull out a cylindrical sample with the rings included. Hide Subjects Browse by Subject. The Short Answer:. Really hot temperatures can make a drought worse by evaporating moisture from the soil. But droughts don't just happen in hot and dry places.

A close-up image of dry, cracked soil during a drought.

Drought and Your Health

Drought is a natural phenomenon in which rainfall is lower than average for an extended period of time. Periods of drought can result in inadequate water supply and can lead to public health problems. Take action and learn how drought can impact your health and the health of your family. Cycles of drought have affected North America for the last 10, years. Droughts can last from a single season to many decades and can affect from a few hundred to millions of square miles. Drought can affect areas or communities differently depending on several additional variables. These variables include:.

Drought is one of the natural disasters that can be reverted by nature itself. Even though it is a natural disaster, it is one that can be prevented by man up to a certain extent. In this article, we will see what drought is, its types , causes and effects. Drought is a temporary situation in which there is the rainfall is below normal that leads to water shortage. The precipitation becomes low which affects the ground and surface water. The entire area dries up and cracks are formed on the ground.

Lessened amounts of precipitation over an area for an extended period of time has many effects on farmland and crops. Drought conditions result from a lack of precipitation and this has many effects on the surrounding land and weather conditions. Drought conditions can worsen after prolonged periods of no rainfall, especially in areas where the water supply is short. Why do I care? The effects of drought play a large role in the water supply to communities as well as damage to crops and other vegetation. Drought can have many devastating effects on communities and the surrounding environment. The amount of devastation depends on the strength of the drought and the length of time an area is considered to be in drought conditions.

What is Drought, its types, causes and effects

A drought is a prolonged period with less-than-average amounts of rain or snow in a particular region. The severity of the drought depends on the amount of time that a region receives below-average precipitation. This is called a flash drought.

Заслонка. Беккер повернул рычажок под топливным баком и снова нажал на стартер. Мотор кашлянул и захлебнулся.

Как и все криптографы АНБ, Хейл зарабатывал огромные деньги, однако вовсе не стремился держать этот факт при. Он ездил на белом лотосе с люком на крыше и звуковой системой с мощными динамиками. Кроме того, он был фанатом всевозможных прибамбасов, и его автомобиль стал своего рода витриной: он установил в нем компьютерную систему глобального позиционирования, замки, приводящиеся в действие голосом, пятиконечный подавитель радаров и сотовый телефонфакс, благодаря которому всегда мог принимать сообщения на автоответчик. На номерном знаке авто была надпись МЕГАБАЙТ в обрамлении сиреневой неоновой трубки. Ранняя юность Грега Хейла не была омрачена криминальными историями, поскольку он провел ее в Корпусе морской пехоты США, где и познакомился с компьютером.

 Могу биться об заклад.

 Зачем же ты убил Чатрукьяна? - бросила. - Я не убивал его! - Крик Хейла перекрыл вой сирены.  - Его столкнул вниз Стратмор. Я все это видел, потому что прятался в подсобке.

 Прошу начальника систем безопасности связаться с главным коммутатором, где его ждет важное сообщение. От изумления у Джаббы глаза вылезли на лоб. Похоже, она от меня не отвяжется. И он решил не реагировать на сообщение. ГЛАВА 79 Стратмор спрятал пейджер в карман и, посмотрев в сторону Третьего узла, протянул руку, чтобы вести Сьюзан за .

 Или?.  - спросил немец с расширившимися от страха глазами. - Или мы придем к соглашению.

Ведь пилот может радировать Стратмору. Усмехнувшись, Беккер еще раз посмотрелся в зеркало и поправил узел галстука. Он уже собрался идти, как что-то в зеркале бросилось ему в .

Беккер вышел в коридор. Нет проблем. А как же проваливай и умри. ГЛАВА 36 Ручное отключение. Сьюзан отказывалась что-либо понимать.

Главный банк данных… Сьюзан отстраненно кивнула. Танкадо использовал ТРАНСТЕКСТ, чтобы запустить вирус в главный банк данных. Стратмор вяло махнул рукой в сторону монитора.

 Да. Это очень важная часть! - заявил лейтенант.  - Это не ребро или палец, как в церквях Галиции. Вам и в самом деле стоило бы задержаться и посмотреть. - Может быть, я так и сделаю.

Вскоре спуск закончился, переключились какие-то шестеренки, и лифт снова начал движение, на этот раз горизонтальное. Сьюзан чувствовала, как кабина набирает скорость, двигаясь в сторону главного здания АНБ. Наконец она остановилась, и дверь открылась. Покашливая, Сьюзан неуверенно шагнула в темный коридор с цементными стенами. Она оказалась в тоннеле, очень узком, с низким потолком.

Тридцатью метрами ниже горел купол шифровалки. Поликарбонатная крыша еще была цела, но под ее прозрачной оболочкой бушевало пламя. Внутри клубились тучи черного дыма. Все трое как завороженные смотрели на это зрелище, не лишенное какой-то потусторонней величественности.

Мидж задумалась. - Может. - Может. - Мы должны позвонить ему и проверить.

Она быстро подняла глаза и увидела возвращающегося Грега Хейла. Он приближался к двери.

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