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Characterizing Land Surface Erosion from Cesium-137 Profiles in Lake and Reservoir Sediments

^a Institute of Mountain Hazards and Environment, PO Box 417, Chengdu, China, and SKLLQG, Institute of Earth Environment, Chinese Academy of Sciences, Xian, China
^b Department of Geography, University of Exeter, Amory Building, Exeter, EX4 4RJ, UK, and visiting professor at Institute of Mountain Hazards and Environment, Chengdu, China

View larger version (12K): [in a new window]   Fig. 1. The temporal pattern of 137Cs fallout in the northern hemisphere, based on data presented by Playford et al. (1995).

View larger version (29K): [in a new window]   Fig. 2. Characteristic depth distributions of 137Cs in uncultivated soils (top graphs) and cultivated soils (bottom graphs) for stable (A), eroding (B), and depositional (C) sites.

View larger version (13K): [in a new window]   Fig. 3. A schematic representation of a typical 137Cs depth profile in the bottom sediment of a lake or reservoir. The term Cdn represents the 137Cs concentration found at the surface of the deposited sediment and Cd0 the concentration found at the depth associated with sediment deposited in 1970.

View larger version (9K): [in a new window]   Fig. 4. The relationship between the mean annual depth of surface lowering on the eroding areas within a cultivated catchment (H = 20 cm) and the rate of decline of 137Cs concentrations (Cdn/Cd0) in the upper (post-1970) horizons of a sediment core collected from a lake or reservoir at the outlet of the catchment.

View larger version (11K): [in a new window]   Fig. 5. A typical relationship between the mean annual depth of surface lowering on the eroding areas within an uncultivated catchment ( = 0.25 cm) and the rate of decline of 137Cs concentrations (Cdn/Cd0) in the upper (post-1970) horizons of a sediment core collected from a lake or reservoir at the outlet of the catchment.

View larger version (29K): [in a new window]   Fig. 6. Cesium-137 depth distributions derived for sediment cores recovered from five lakes and reservoirs in southern England.