INVESTIGADORES
BUSCHIAZZO Daniel Eduardo
artículos
Título:
Comparison of different mass transport calculation methods for wind erosion quantification purposes
Autor/es:
PANEBIANCO, JUAN ESTEBAN; BUSCHIAZZO, D.E.; ZOBECK, T.M.
Revista:
EARTH SURFACE PROCESSES AND LANDFORMS
Editorial:
JOHN WILEY & SONS LTD
Referencias:
Año: 2010 vol. 35 p. 1548 - 1555
ISSN:
0197-9337
Resumen:
Quantitative estimation of the material transported by the wind under field conditions is essential for the study and control of wind erosion. A critical step of this calculation is the integration of the curve that relates the variation of the amount of the material carried by the wind with height. Several mathematical procedures have been proposed for this calculation, but results are scarce and controversial. One objective of this study was to assess the efficiency of the following mathematical approaches for the calculation of the mass transport, as compared to linear spline interpolation:     (1)        (2)        (3) Another objective of this study was to compare the mass transport calculated from field measurements obtained from a minimum of three discrete sampling heights with measurements of nein sampling heights. With this purpose wind erosion was measured on an Entic Haplustoll during 25 events. The rational function (1) was found to be mathematically limited for the estimation of wind eroded sediment mass flux. The simplified Gaussian model (3) did not fit to the vertical mass flux profile data. Linear spline interpolation generally produced higher mass transport estimates than the exponential (2) equation, and it proved to be a very flexible and robust method. The exponential model, even with data from three sampling heights, proved to be a feasible method for field wind erosion quantification under low surface roughness conditions. Using different sampling arrangements and different mass flux models can produce differences of more than 45% in mass transport estimates, even under similar field conditions. Under the conditions of this study, at least three points within soil surface and 1.5m high, including one point as closest as possible to the surface, should be sampled in order to obtain accurate mass transport estimates. Additionally, the linear spline interpolation and the non linear regression using an exponential model, proved to be mathematically reliable methods for calculating the mass transport.