Characteristics of Land Surface Parameters of the Underlying Surface of Gobi Photovoltaic Power Station

The construction and operation of photovoltaic （PV） power stations have changed the surface characteristics of the natural underlying surface， which may cause changes in land surface process factors such as surface albedo and surface roughness， affecting the characteristics of material exchange and energy distribution.In order to explore the influence of the construction of Gobi photovoltaic power station on the underlying land surface parameters and improve the land surface process model， this paper studied the characteristics of the underlying land surface parameters of the photovoltaic power station based on the observation data of the photovoltaic power station and reference stations in Wujiaqu.The results showed that the average aerodynamic roughness inside the PV plant is 0.12 m， which is much larger than the roughness of the natural Gobi underlying surface.During the daytime， the friction velocity and momentum flux inside the PV plant are larger than those at the reference site， with the maximum values in the daily variation increased by 18.8% and 38.5%， respectively.The vertical turbulent mixing in the PV plant increased by 22.2% compared to the reference site， while the latitudinal and longitudinal turbulence intensity decreased by 11.8% and 2.9%， respectively.The average soil thermal conductivity of 5~20 cm depth in photovoltaic power station is 0.33 W·（m·K）-1.