| ON THE NUMBER OF FRACTIONS TO COMPUTE TRANSPORT OF SEDIMENT MIXTURES |
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| 作者姓名： | Pedro A. BASILE Center for Hydroenvironmental Research National University of Rosario |
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| 作者单位： | Center for Hydroenvironmental Research, National University of Rosario, (2000) Rosario, Argentina
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| 摘 要： | 1 INTRODUCTIONMany hydro-momhological mathematical models neglect the innuence of river bed maerialheterogeneity and its time and space changes during transport and related erosion/dePosition processes. Inthese models a rePresentative diameter of the river bed grain-size distribution (for examPle d5o) isspecified as initial data in each comPutational point of the modeled domain. Different d5o can be assignedto each ghd point but temPoral changes in bed material gradation cannot be simula…
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ON THE NUMBER OF FRACTIONS TO COMPUTE TRANSPORT OF SEDIMENT MIXTURES |
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| Pedro A. BASILE Center for Hydroenvironmental Research,National University of Rosario,.ON THE NUMBER OF FRACTIONS TO COMPUTE TRANSPORT OF SEDIMENT MIXTURES[J].International Journal of Sediment Research,2001,16(3). |
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| Authors: | Pedro ABASILE |
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| Abstract: | This paper deals with the determination of the minimum number of granulometric classes that should be used to calculate sediment transport of non-uniform grain-size materials. This is very important to reduce computational efforts in hydro-morphological mathematical models based on sediment continuity by fractions. In the case of log-normal river bed grain-size distributions the increment of the geometric standard deviation itself is already sufficient to describe the corresponding augment of the number of classes. However, strongly non-uniform river bed sediments (like those encountered in gravel-bed rivers) show completely different statistical characteristics when compared with the former ones. Herein specific relationships are developed which confirm that in these cases both the geometric standard deviation and the skewness of the grain-size distribution must be taken into account to define the minimum number of grain-size classes. |
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| Keywords: | Non-uniform sediments Sediment transport of mixtures Number of fractions |
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