Migration of rectangular mining pit composed of nonuniform sediments
Journal
Journal of the Chinese Institute of Engineers, Transactions of the Chinese Institute of Engineers,Series A/Chung-kuo Kung Ch'eng Hsuch K'an
Journal Volume
19
Journal Issue
2
Pages
255-264
Date Issued
1996
Author(s)
Abstract
Abstract A mining pit in a riverbed is rather unstable and subject to scouring and deposition, thereby resulting in the migration of the pit. A series of experiments were conducted in this study to investigate the migration behaviors of several rectangular pits composed of nonuniform sediments. Experimental results indicate that the migration of the pit can be separated into two periods, i.e., a convection period, in which the scouring depth remains nearly constant, and a diffusion period, in which the scouring depth decreases as time proceeds. The migration speed in each period remains constant and increases as the sediment transport capacity increases. The migration speed of the diffusion period is faster than that of the convection period except for when the bed surface is fully armoured. The maximum scour depth of the diffusion period decreases as sediment transport capacity increases and varies inversely with the armouring factor, while the effective length increases as sediment transport capacity and the armouring factor increase. Regression equations for the maximum scour depth, effective length and migration speeds are also obtained. Key words: sediment transportgravel miningnonuniform sediment Notes Correspondence addressee
SDGs
Type
journal article