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- W2391390981 abstract "Supported by GIS techniques,the land cover data were obtained on the basis of Landsat-5 TM images derived in 2005 and DEM data(1∶250 000) in Minqin and its surrounding area,Gansu of China.Comparison between the new land cover data and the original data of 1980s used in GRAPES_SDM model was then carried out.Finally,numerical simulation for a severe dust storm process occurred from 23 to 25 April,2010 in Northwest China was conducted based on the two times of land cover data,respectively,and the simulation results were thereupon compared and evaluated by combining the observation data of the Minqin weather station.It was found out that the areas of sandy land,grassland,cropland,inland water area,and wetland decreased obviously in Minqin and its surrounding area,while urban and rural construction land changed little compared with the original land cover data used in the model.The results also showed that changes of land cover affected model outputs in extent and intensity of surface dust emission and dust concentration: On the one hand,the updating of land cover data made dust emission weaken in general,and the impact on dust emission increased with the enhancement of dust storm intensity.On the other hand,the influences of land cover changes on surface dust concentration were primeval,ambulant,and scale adaptive,which also obviously altered the distribution of dust concentration in vertical direction.What's more,the updating of land cover data is benefit to make the simulated value of surface dust concentration during dust emission in Minqin closer to the observations,implying that the land cover data used in the model should be updated in time." @default.
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- W2391390981 date "2012-01-01" @default.
- W2391390981 modified "2023-09-22" @default.
- W2391390981 title "Land Cover Changes and Their Influences on Dust Transportation Simulated Using GRAPES-SDM in Minqin and Its Surrounding Area,Gansu,China" @default.
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