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W200989842 abstract "ALAN PURBA KUSUMA. The Dynamics of Surface Boundary Layer Characteristics above Oil Palm Plantation. Supervised by TANIA JUNE. The research conducted in two separated oil palm plantation sites, i.e. in Pompa Air Village, Jambi (2 years old of oil palm) and in PT. Perkebunan Nusantara VIII, Cimulang, West Java (8-10 years old of oil palm) showed that the roughness parameters including zero-plane displacement (d), friction velocity (u), and roughness length ( z0 ) increase with the rise of the age of plants. These parameters play a crucial role in affecting the dynamics of wind vertical-profile, turbulence intensity, turbulence kinetic energy (TKE), as well as momentum and heat (sensible and latent) transport mechanisms. Based on the results, above the plant canopies of both of plantation sites, the wind speed will be disturbed by and logarithmically decreased downward to just above the roughness elements by the surface shear stress which has postitive correlation with the drag coefficient (CD). Value of CD is equivalent to square of ratio between the tangential velocity of air flow generated by mechanical turbulence and wind speed at certain height. Above both of plantation sites in neutral atmospheric condition CD tended to decrease with the increase of wind speed. In addition, in unstable atmospheric condition, surface heating process by short wave radiation generates buoyancy reaching its peak at mid-day (12 am 2 pm). All of these mechanisms cause chaotic air flow and convert kinetic and potential energy of stratified mean flow into TKE. Based on result, TKE had high correlation with sensible heat flux and latent heat flux as well. It showed that turbulence has more efficient mixing mechanism than molecular diffussion process." @default.
W200989842 created "2016-06-24" @default.
W200989842 creator A5002387787 @default.
W200989842 date "2014-01-01" @default.
W200989842 modified "2023-09-24" @default.
W200989842 title "Dinamika karakteristik lapisan perbatas permukaan (surface boundary layer) di atas perkebunan kelapa sawit" @default.
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