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http://dx.doi.org/10.3741/JKWRA.2010.43.7.657

Experimental Study on the Adjustment Processes of Minning Pit in the Dredged Channels  

Jang, Chang-Lae (Dept. of Civil Engineering, Chungju National University)
Jung, Kwan-Sue (Dept. of Civil Engineering, Chungju National University)
Publication Information
Journal of Korea Water Resources Association / v.43, no.7, 2010 , pp. 657-666 More about this Journal
Abstract
The adjustment processes of mining pits in the disturbed channels by sand or gravel mining were investigated by laboratory experiments in this study. The pit migrated with speed when the river bed was steep. The pit migrated slow and steady when the pit was filling with sand, but the pit migrated with speed after the filling processes was finished. The submerged angle of repose in the pit was nearly constant during the pit was filling. The pit was filled with sand with speed as the channel slope was increased. It took time for the pit to be filled with sand as the pit dimension was increased. This meant that the disturbed channels by sand or gravel mining to adjust the new environment was dependent on the slope of the channels and the dimension of the pits. The dimensionless pit length was short and the dimensionless pit depth was shallow as the time was increased. The dimensionless pit depth was shallow, but the dimensionless pit migration speed was increased as the dimensionless shear velocity and the migration speed of the pit were increased. The dimensionless pit depth was increased with the dimensionless bar migration speed. The shape of the pit was deformed and migrated downstream in accordance with the location and shape of the biased bar front which was developed upstream.
Keywords
dredged channel; mining pit; bed change; adjustment processes;
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