Abstract:

Sand and dust weather includes dust devil， sand and dust storm and other sand and dust processes， which do great harm to ecology， production and life. With the frequent occurrence of dust storms in recent years， especially this year， debates have arisen regarding the role of farmland shelterbelts in preventing and controlling dust storms. In light of this， we focused on discussing the thermodynamic mechanisms of the formation and development of severe convective dust storms， including the thermodynamic effects of dust devils and dust rising in dust storms， the thermodynamic values of dust and the estimation of the lifting energy density of dry squall line black storm and squall line hailstorm， etc. Based on this， we obtained the mechanisms and effects of farmland shelterbelts in preventing and controlling dust storms： （1） slowing down the accumulation of surface heat， dissipating advection and convective heat through friction， effectively preventing surface wind erosion and dust uplift； （2） the static air space within the forest network can capture dust particles and filter dust； （3） promoting the exchange of high-altitude dusty airflows with near-ground turbulent flows， continuously directing micro-dust enters the dust retention spaces for filtration. In the future， it is necessary to strengthen the monitoring of dust source areas， the positive feedback effects of dust thermal dynamics and the dust suppression effect of different farmland shelterbelts configurations.

Key words: dust weather, severe convective dust storm, dust thermal dynamics, farmland shelterbelts