Patterns of grain-size temporal variation of sediment transported by overland flow associated with moving storms: interpreting soil flume experiments
Abstract
This study describes and interprets the evolution of grain-size distribution of sediment yields generated
in an experimental soil flume subjected to downstream and upstream moving rain storms. Results of laboratory experiments
show that downstream moving storms cause more soil loss than do upstream moving storms. The pattern of sediment
grain-size evolution in time during a runoff event exhibits a clear dependence on the direction of storm movement.
A strong relationship between overland flow discharge and mean sediment size is found. Nevertheless, the mean
grain-size of sediments transported during the rising limb of the hydrograph is coarser than during the recession limb of
the hydrograph. This is more marked for downstream moving storms.
Subject
MODELING WATER EROSIONWIND-DRIVEN RAIN
PHYSICAL PRINCIPLES
LASER DIFFRACTION
SURFACE RUNOFF