| MECHANISM OF ARMORING PHENOMENA |
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| 作者姓名： | Shinji Egathira and Kazuo Ashida Associate Professor Disaster Prevention Research institute Kyoto University. Professor Disaster Prevention Research Institute Kyoto University. |
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| 作者单位： | Shinji Egathira and Kazuo Ashida Associate Professor，Disaster Prevention Research institute，Kyoto University. Professor，Disaster Prevention Research Institute，Kyoto University. |
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| 摘 要： | I. INTRODUCTIONArmor coats, which are comPOSed of particles coarser than those of the under layers, are usually foundon the bed surfaces of mountain streams or gravel bed rivers. A large number of P8pers have been publishedon armor coats. Most of them emphasize that the selective entrainment or transportation plays an imPOrtantrole on the armoring processes.Some recent studies indicate that the difficulty arises in describing the propagation of armor coats interms of selective entrainm…
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MECHANISM OF ARMORING PHENOMENA |
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| Shinji Egathira and Kazuo Ashida Associate Professor,Disaster Prevention Research institute,Kyoto University. Professor,Disaster Prevention Research Institute,Kyoto University..MECHANISM OF ARMORING PHENOMENA[J].International Journal of Sediment Research,1990(1). |
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| Authors: | Shinji Egathira and Kazuo Ashida Associate Professor Disaster Prevention Research institute Kyoto University Professor Disaster Prevention Research Institute Kyoto University |
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| Abstract: | It is indicated that armor coats are formed even if all the sediment particles of the river ho move. Such armor coats can not be described in terms of selective entrainment. In this study, the mechanism on the formation of armor coat is investignted, first, with the flume data. A mathematical model, in which the processes of particle exchange within bed layers as well as of the selective entrainment are taken into account, is presented This model is analyzed numerically and compared with experimental data. |
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| Keywords: | bed armoring Selective entrainment Particle exchange Flume test Mathematical model Bed layer |
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