Sediment information is closely related to a lake-catchment system.Lake Baikal and Lake Khuvsgul in the Baikal depression have shown different sedimentary trends during the past 800 ka;the sediment discharge(sedimentation rate) in Baikal basically followed the global climatic change,whereas that in Khuvsgul did not always do so.An elementary mathematical model is used to explain the difference,considering changes in the catchment area and water level.Numerical calculations based on the model suggest that sedimentary conditions are closely related to changes in the water level and erosion area,which probably had a significant influence on Lake Khuvsgul and little influence on Lake Baikal.
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