Abstract
The study of water and heat flux in Aral Sea Basin is a hot topic in the study of water resources in Central Asia. Aerodynamic roughness is the key parameter of inversion. Zom is retrieved based on NDVI and Albedo simulation and verified by the vegetation height in Central Asia. The results show that the inversion of Zom by this model is basically reasonable. In 2018, the monthly average value of Zom is about 0.056m, the vegetation height in Aral Sea Basin is about 0.44m, and both Zom and vegetation height in space are higher in eastern mountainous areas than in western desert areas.
Highlights
Vegetation height in Aerodynamic Roughness (, Aerodynamic Roughness Length) refers to the fact that when airflow passes through a certain physical boundary, if the flow velocity near the boundary is zero, the physical boundary is said to be aerodynamically rough, and its size mainly depends on the surface roughness, that is, the distribution of underlying surface types[1]. is a key parameter for studying surface water heat flux, and is a basic parameter for estimating thermodynamic roughness ( Thermal Roughness Length), additional damping of heat transfer (KB(-1)), regional sensible heat flux and latent heat flux
The simulated vegetation height in June based on inversion is compared with the spatial distribution map of vegetation height formed by typical vegetation gridding based on vegetation zoning and surface classification, as shown in Table 2, in which the vegetation height is compared and analyzed according to the three conditions of land type, geographical zoning and vegetation zoning respectively, hRe is the height of typical vegetation and hes is the simulated inversion of vegetation height
The results of dynamic roughness of Aral sea basin based on NDVI and Albedo simulation inversion are reasonable
Summary
Aerodynamic Roughness ( , Aerodynamic Roughness Length) refers to the fact that when airflow passes through a certain physical boundary, if the flow velocity near the boundary is zero, the physical boundary is said to be aerodynamically rough, and its size mainly depends on the surface roughness, that is, the distribution of underlying surface types[1]. is a key parameter for studying surface water heat flux, and is a basic parameter for estimating thermodynamic roughness ( Thermal Roughness Length), additional damping of heat transfer (KB(-1)), regional sensible heat flux and latent heat flux. Aerodynamic Roughness ( , Aerodynamic Roughness Length) refers to the fact that when airflow passes through a certain physical boundary, if the flow velocity near the boundary is zero, the physical boundary is said to be aerodynamically rough, and its size mainly depends on the surface roughness, that is, the distribution of underlying surface types[1]. Is a key parameter for studying surface water heat flux, and is a basic parameter for estimating thermodynamic roughness ( Thermal Roughness Length), additional damping of heat transfer (KB(-1)), regional sensible heat flux and latent heat flux. Aral Sea Basin is located in the center of Eurasia. It is a typical arid and semi-arid region with a general lack of water resources [2,3]. The accurate estimation and verification analysis of can provide a more accurate parameter basis for regional energy balance and remote sensing simulation of surface energy in this region
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