ESTIMATING DUSTFALL GENERATION AFFECTED BY WIND SPEED, SOIL MOISTURE CONTENT AND LAND COVER
There is a lack of quantitative approach to estimate the amount of natural and anthropogenic dustfall generation during an environmental impact assessment in Indonesia. Dustfall is an obligatory parameter of Indonesian ambient air quality standard. The final objective of the research was to formulate a simple mathematical expression used to estimate the ambient dustfall generation as affected by wind speed, soil moisture content and land cover, during an environmental impact assessment. The
... assessment. The experiment was carried out in a laboratory scale tunnel with a land model consisted of soil layer originated from Java Island, Indonesia, i.e. Complex Mediteran Red Yellow Grumusol (RYG) and Regosol (REG). Three speed levels of artificial blowing wind were applied in the tunnel to assess the impact of wind speed on the dustfall generation. Soil moisture content was kept in the range of 35-40%. Paddy plant (15 cm high) was used to serve as land cover to simulate the impact of cover crop on the generated dustfall. Analysis on the resulted dustfall was carried out according to national standard (SNI 13-4703-1998). The revealed experiment result showed that the average generated dustfall over RYG soil type was 14 ton/km 2 .month, whereas for Regosol was 4 ton/km 2 .month. Mathematical expression of the dustfall generation was successfully formulated. It indicated that dustfall generation was strongly affected by wind speed, soil moisture content and land cover. The mathematical expression can be used to estimate the amount of dustfall generation by simply inputting the three affecting parameters (soil moisture content, wind speed and land cover).