INVESTIGADORES
BUSCHIAZZO Daniel Eduardo
congresos y reuniones científicas
Título:
Airborne horizontal mass flux calculated with different equations
Autor/es:
BUSCHIAZZO, DANIEL E.; ZOBECK, TED
Lugar:
Tampa, Florida, EEUU
Reunión:
Workshop; ASAE Annual International Meeting; 2005
Institución organizadora:
Am. Soc., Agronomy
Resumen:
The quantification of airborne material passing by a vertical plane as a function of height, the horizontal mass flux (HMF), is essential in measuring field wind erosion. Two commonly used equations to calculate HMF are : Q = a Z-b [1], where Q is the amount of dust collected, Z the height, and a and b are regression coefficients: and Q = fo(1 + (Z/ σ) –ß [2] where fo = is the movement of the soil at the soil surface, σ and ß are regression coefficients. Different HMF estimates are expected when comparing equations, as the integration of the eroded material as a function of height can be performed from 0 (surface) with equation [2] but not with equation [1]. Calculations were made for 28 storms using dust samplers placed at heights of a) 13.5, 50 and 150 cm (Q3) and b) 0.15, 0.7, 1.5, 7, 12, 22.5, 13.5, 50 and 150 cm (Q9). HMF calculated with equations [1] and [2] correlated well but HMF of equation [1] were 40 to 55% lower than those of equation [2]. The averaged fitting of the amount of transported material with height was lower and more variable when using equation [1] than when using equation [2]. These results showed that HFM obtained with equation [1] are highly dependent on sampling height, and need to be corrected on the basis of data obtained closer to the surface before they can be used to test wind erosion prediction models, unlike HMF obtained using equation [2].