EXPERIMENTAL AND FIELD STUDY ON MINING-PIT MIGRATION
EXPERIMENTAL AND FIELD STUDY ON MINING-PIT MIGRATION作者机构：Civil Engineering Dept. University of Tarbiat Modarres University of Tarbiat Modarres University of Tarbiat Modarres Assistant Professor P.O.Box14115-143 Tehran Iran Ph.D.Student Msc.Student
出 版 物：《International Journal of Sediment Research》 (国际泥沙研究(英文版))
年 卷 期：2002年第17卷第4期
页 面：323-331页
学科分类：08[工学] 081502[工学-水力学及河流动力学] 0815[工学-水利工程]
主 题：Pit migration Sand and gravel mining Experiment Field study
摘 要：Rivers are one of the most essential sources of sand and gravel supply for civil works. However, undesirable effects of irregular in-stream mining have been reported on natural sources, environment and infrastructures close to rivers. Therefore, it is necessary to find the effects of mining on rivers in more details. This research concentrates on mining-pit migration phenomenon and its effects on the channel bed. This paper reports an experimental study on the migration of rectangular mining pits and variation of longitudinal profile in the channel bed composed of rather uniform sediments. Different values of widths and lengths were used for pit while pit depths and flow variables were kept constant. The results show that the migration speed changes with the length/width ratio of the pit. The migration speed in convection period is higher than that in diffusion period. In addition, by increasing the length or width, filling rate of pit increases, where the effect of width is more important than the effect of the length. Also is reported in this paper a field study on the changes of three pits excavated at different locations of a river. Some similarities between the pit migration in the straight reach of the river and that of the experimental work is realized and presented.
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