THE INFLUENCE OF CONVERSION MODEL CHOICE FOR EROSION RATE ESTIMATION AND THE SENSITIVITY OF THE RESULTS TO CHANGES IN THE MODEL PARAMETER
ABSTRACT: A study of soil
erosion rates had been done on a slightly and long slope of cultivated area in
Ciawi – Bogor, using 137 Cs technique. The objective of the present study was
to evaluate the applicability of the 137 Cs technique in obtaining spatially
distributed information of soil redistribution at small catchment. This paper
reports the result of the choice of conversion model for erosion rate estimates
and the sensitive of the changes in the model parameter. For this purpose,
small site was selected, namely landuse I (LU-I). The top of a slope was chosen
as a reference site. The erosion/deposit rate of individual sampling points was
estimated using the conversion models, namely Proportional Model (PM), Mass
Balance Model 1 (MBM1) and Mass Balance Model 2 (MBM2). A comparison of the conversion
models showed that the lowest value is obtained by the PM. The MBM1 gave values
closer to MBM2, but MBM2 gave a reliable values. In this study, a sensitivity
analysis suggest that the conversion models are sensitive to changes in
parameters that depend on the site conditions, but insensitive to changes in
parameters that interact to the onset of 137 Cs fallout input.
Author: Nita Suhartini
Journal Code: jpkimiagg060030
