Precipitation has a very important influence in the process of agricultural planting, and it has a great influence on soil moisture and water supply measures. Therefore, under the development of modern precision agriculture, the use of rainfall recorders is very necessary for the determination of precipitation. However, the observation of precipitation is affected by evaporation. Water evaporation is an important process in the water cycle. The amount of evaporation is affected by many factors, and the installation height of the rainfall recorder is also one of the influencing factors.
Three sets of rainfall recorders are arranged in the evaporation field, and the heights of their mouths from the ground are 100, 70, and 15 cm, respectively. 100cm is a self-reporting gauge and 70 and 15cm are manual gauges. The gauges are arranged in the east-west direction and the distance between the instruments is about 4m. Evaporation station 4 kinds of evaporation instruments in the calculation of evaporation, because the evaporator mouth height from the ground is not the same, the value of P in the formula (1) should not be the same P value of the rain gauge, P value should be used with the evaporator The distance recorder corresponds to the height of the ground.
Evaporator mouth from the ground height of 70cm 20cm evaporating dish, 80cm evaporation basin, formula (1) of the P value should be used from the mouth height of 70cm rain gauge rainfall measured. The E-601B evaporator with an evaporator height of 30 cm above the ground should be used. The P value of type (1) should be measured using a 15 cm rain gauge measured at the height of the ground. Evaporator mouth from the floor height of 15cm 20m2 evaporation pond, the type of P value is appropriate to use the mouth from the ground height of 15cm rainfall measured by the rain gauge. Evaporation is a very complex natural phenomenon in the process of water cycle. It is clear to analyze and master its inherent laws and plays a decisive role in people's life, military, industry, agriculture, and especially the construction of water conservancy projects. In recent years, the global climate has been warming year by year. Scholars from all over the world have paid more attention to the study of evaporation. The internal laws of evaporation have been studied, and their social and economic values ​​are increasingly evident. Grasping the inherent laws and eliminating external factors is an important means to improve the accuracy of evaporation. We hereby recommend:
When setting up evaporation fields, sites that meet the industry standards such as open terrain, air circulation, unobstructed objects nearby, and good natural vegetation should be selected as much as possible. When setting the gauge, try to keep the height of the instrument from the ground and the height of the evaporator from the ground. When measuring the amount of evaporation, minimize human error and eliminate external factors. During periods of heavy rain or high winds, it is advisable to measure the rainfall amount by section and to obtain the total value of P, and to minimize the impact of E value due to the P value error caused by rain intensity and strong wind, that is, to affect the accuracy of evaporation.
In agricultural production and life, the use of a rainfall recorder is generally necessary for the determination of rainfall. However, in order to obtain a more accurate measurement result, promote the implementation of agricultural measures, and improve agricultural economic returns, it is necessary to pay attention to the installation of the instrument. Height and location.
Three sets of rainfall recorders are arranged in the evaporation field, and the heights of their mouths from the ground are 100, 70, and 15 cm, respectively. 100cm is a self-reporting gauge and 70 and 15cm are manual gauges. The gauges are arranged in the east-west direction and the distance between the instruments is about 4m. Evaporation station 4 kinds of evaporation instruments in the calculation of evaporation, because the evaporator mouth height from the ground is not the same, the value of P in the formula (1) should not be the same P value of the rain gauge, P value should be used with the evaporator The distance recorder corresponds to the height of the ground.
Evaporator mouth from the ground height of 70cm 20cm evaporating dish, 80cm evaporation basin, formula (1) of the P value should be used from the mouth height of 70cm rain gauge rainfall measured. The E-601B evaporator with an evaporator height of 30 cm above the ground should be used. The P value of type (1) should be measured using a 15 cm rain gauge measured at the height of the ground. Evaporator mouth from the floor height of 15cm 20m2 evaporation pond, the type of P value is appropriate to use the mouth from the ground height of 15cm rainfall measured by the rain gauge. Evaporation is a very complex natural phenomenon in the process of water cycle. It is clear to analyze and master its inherent laws and plays a decisive role in people's life, military, industry, agriculture, and especially the construction of water conservancy projects. In recent years, the global climate has been warming year by year. Scholars from all over the world have paid more attention to the study of evaporation. The internal laws of evaporation have been studied, and their social and economic values ​​are increasingly evident. Grasping the inherent laws and eliminating external factors is an important means to improve the accuracy of evaporation. We hereby recommend:
When setting up evaporation fields, sites that meet the industry standards such as open terrain, air circulation, unobstructed objects nearby, and good natural vegetation should be selected as much as possible. When setting the gauge, try to keep the height of the instrument from the ground and the height of the evaporator from the ground. When measuring the amount of evaporation, minimize human error and eliminate external factors. During periods of heavy rain or high winds, it is advisable to measure the rainfall amount by section and to obtain the total value of P, and to minimize the impact of E value due to the P value error caused by rain intensity and strong wind, that is, to affect the accuracy of evaporation.
In agricultural production and life, the use of a rainfall recorder is generally necessary for the determination of rainfall. However, in order to obtain a more accurate measurement result, promote the implementation of agricultural measures, and improve agricultural economic returns, it is necessary to pay attention to the installation of the instrument. Height and location.
Eccentric Concrete Vibrator ,Concrete Vibrator Tool,Concrete Vibrator Cordless,Concrete Vibrator Rental
NINGBO TIANCE MACHINERY CO.LTD , https://www.provibra.com