Fallout Radionuclides - Application of Geochemical Tracers to Fluvial Sediment - page 64

Fig. 3.6 Variations in estimated soil redistribution rates calculated using 137 Cs and 210 Pb for a slope
in the Pre-Pyrenean Mountains of northeast Spain. Local profile shows sampling points, average
hillslope gradient and land-use at sampled site (from Gaspar et al. 2013 )
However, sediments budgets are difficult to develop using traditional monitoring
techniques because while they can effectively document sediment transport rates
along the drainage network, they do not explicitly determine the transfer of sediment
from one landscape unit to another (Blake et al. 2009 ). The FRN budgeting approach
overcomes this problem.
Wallbrink et al. ( 2002 ), for example, demonstrated that a sediment budget could
be constructed for a hillslope on the basis of 137 Cs inventories to assess areas of soil
erosion and deposition, the rates of sediment transfer between different landform
units, and the overall loss of sediment from the system. In this case, the data were
needed to assess the effectiveness of sediment management practices associated
with forest harvesting. In general, their sediment budget, and those that followed,