Iraguha Thierry
Dec 22, 2023
What are the methods used to measure evaporation?
May you explain them in brief?
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Dec 22, 2023
There are several methods used to measure evaporation. Some of the commonly used methods include:
1. Gravimetric Method: This method involves measuring the change in weight of an open container filled with the liquid being evaporated over a specific time period. The weight loss corresponds to the amount of liquid evaporated.
2. Pan Evaporation Method: In this method, a pan filled with water is placed in an open area, and the amount of water evaporated from the pan is measured over a specific time period. This method is commonly used for estimating evaporation rates in meteorology and hydrology.
3. Piche Evaporimeter: It is a device consisting of a graduated glass tube with a small opening at the bottom. The tube is filled with water, and the rate of evaporation is determined by measuring the drop in water level over a specific time period.
4. Eddy Covariance Method: This method is commonly used in atmospheric science and involves measuring the exchange of water vapor between the surface and the atmosphere using high-frequency measurements of wind speed, temperature, and humidity.
5. Bowen Ratio Method: This method measures the ratio of sensible heat flux to latent heat flux to estimate evaporation. It involves measuring temperature and humidity gradients between the surface and the atmosphere.
6. Lysimeter Method: Lysimeters are devices that measure the amount of water lost through evaporation from a specific area of soil or vegetation. They consist of a container with a known surface area and are equipped with sensors to measure water content and evaporation rates.
7. Remote Sensing: Satellite-based remote sensing techniques, such as thermal infrared imagery, can be used to estimate evaporation rates over large areas by measuring the surface temperature and other relevant parameters.
These methods can be used individually or in combination depending on the specific requirements and conditions of the study.
1. Gravimetric Method: This method involves measuring the change in weight of an open container filled with the liquid being evaporated over a specific time period. The weight loss corresponds to the amount of liquid evaporated.
2. Pan Evaporation Method: In this method, a pan filled with water is placed in an open area, and the amount of water evaporated from the pan is measured over a specific time period. This method is commonly used for estimating evaporation rates in meteorology and hydrology.
3. Piche Evaporimeter: It is a device consisting of a graduated glass tube with a small opening at the bottom. The tube is filled with water, and the rate of evaporation is determined by measuring the drop in water level over a specific time period.
4. Eddy Covariance Method: This method is commonly used in atmospheric science and involves measuring the exchange of water vapor between the surface and the atmosphere using high-frequency measurements of wind speed, temperature, and humidity.
5. Bowen Ratio Method: This method measures the ratio of sensible heat flux to latent heat flux to estimate evaporation. It involves measuring temperature and humidity gradients between the surface and the atmosphere.
6. Lysimeter Method: Lysimeters are devices that measure the amount of water lost through evaporation from a specific area of soil or vegetation. They consist of a container with a known surface area and are equipped with sensors to measure water content and evaporation rates.
7. Remote Sensing: Satellite-based remote sensing techniques, such as thermal infrared imagery, can be used to estimate evaporation rates over large areas by measuring the surface temperature and other relevant parameters.
These methods can be used individually or in combination depending on the specific requirements and conditions of the study.
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