Grain Size Characteristics Of Topsoil Under Photovolt Plate In Hobp Desert

In order to explore the distribution law of the surface soil particle size under the photovoltaic panel,the research was carried out in the 200MWp solar power base in the Hobp desert,and the surface soil of 0-5cm was selected as the research object.Using a laser diffraction technique,analyzing the characteristic of the soil particle size in order to avoid the photovoltaic power station construction in the process of large degree on soil disturbance on the test results,the influence of related parameters on the analysis of particle size,the introduction of the variation coefficient.To explore the correlation between volume fractal dimension and point distribution and photovolt plate distribution.compared with the change of its degree and the regularities of the photovoltaic panels of particle distribution are obtained with double perspective analysis method.On the one hand,the 9 sample points under the photovoltaic panel were taken as the research object,and all the sample points at the same point of the whole research area were integrated to study the change characteristics of soil surface particle size under the panel,reflecting the change law of the small area.On the other hand,taking a single photovoltaic panel as the research object,the characteristics of soil surface particle size change under each photovoltaic panel in the sample area were studied based on the data results of each point under the panel,reflecting the change law of the large area,and combining the data results,the photovoltaic panel in the sample area was divided into the east-west line for analysis.The influence of photovolt plate on the main wind direction-northwest wind and photovoltaic plate oriented wind direction-south wind flow field is also explored.results are as follows:(1)In the 200MWp solar energy base of Hobp desert,the surface soil grain size distribution of the sample area is mainly medium and fine sand,and the sum proportion of medium sand and fine sand is higher than 95%;The soil mechanical composition of 0-5cm under photovoltaic plate in this sample area for 3 years is not obviously affected by the soil disturbance caused by the construction of photovoltaic base.(2)The fractal dimension of particle size volume of subplate topsoil is negatively correlated with the distribution of points under the plate R2=0.1145,and positively correlated with the azimuth change of photovolt plate R2=0.4304,but the determination coefficient R2 is small,so the correlation is small;The particle size of topsoil at each point under the plate is smaller than that at the midpoint under the plate,and the kinetic energy at the midpoint at the front of the plate is larger.(3)The average percentage of soil particle size volume under the plate,the extreme value distribution in the main wind direction upwind region along the wind direction,in the non-main wind direction upwind area along the photovolt plate tilt direction has a regular change;The acceleration of the southward photovolt plate to the northwest wind is concentrated in the midpoint below the plate and the front part of the plate,and the acceleration of the southward wind is concentrated in the front of the plate.