Development of the bed load transport equation for nonuniform sediment in mountain rivers
Developing a bed load transport for size fractions requires an understanding of basic theory for the properselection of independent variables. To evaluate the selected independent variables as predictors of bed load transport equation, a linear regression procedure was initially chosen. Development...
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[Yogyakarta] : Universitas Gadjah Mada
2000
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| author | Perpustakaan UGM, i-lib |
| author_facet | Perpustakaan UGM, i-lib |
| author_sort | Perpustakaan UGM, i-lib |
| collection | UGM |
| description | Developing a bed load transport for size fractions requires an understanding of basic theory for the properselection of independent variables. To evaluate the selected independent variables as predictors of bed load transport equation, a linear regression procedure was initially chosen.
Development of the equation for bed load transport by size fraction in this study was based on element of three equations of bed load transport. The first is the Schoklitsch (1962) total bed load transport equation, which uses only one single size diameter D40 and neglects the proportion of bed load and bed material in each size fraction, but involves channel slope. The second equation is the bed load transport equation of Shih and Komar (1990) in which the proportion of bed load in each size fraction is used to obtain the bed load transport for each size fraction. The effect of the bed load size distribution is considered, but the effect of the bed material size distribution and channel slope are neglected. The third equation is the bed load transport equation of Wilcock and Southard (1989) in which both proportions of size fraction, in the bed load and in the bed material are used to calculate the bed load transport by size fraction. However, the equation of Wilcock and Southard was based on laboratory data where the size distribution of the bed load was similar to the size distribution of the bed material. It therefore needs to be compared with data from natural rivers where the bed load size distribution generally narrower than the bed material size distribution.
General relationships of the bed load transport for individual size fractions as well as total bed load transport have been developed. The approach of the relationships is the water discharge approach, which may be more appropriate for steep channels with coarse non-uniform materials characteristic of mountain regions, than one based on shear stress. Three parameters have been considered (channel slope, bed material and bed load size distribution) involve together in the equations. This basis may not be found in the previous equations for bed load transport.
Independent tests the observed data for bed load transport for individual size fractions are in a good agreement with the values obtained by derived equation, which provides encouraging support for the relationship.
Key Words: Bed load transport - nonuniform sediment - civil engineering |
| first_indexed | 2024-03-13T18:35:43Z |
| format | Article |
| id | oai:generic.eprints.org:18345 |
| institution | Universiti Gadjah Mada |
| last_indexed | 2024-03-13T18:35:43Z |
| publishDate | 2000 |
| publisher | [Yogyakarta] : Universitas Gadjah Mada |
| record_format | dspace |
| spelling | oai:generic.eprints.org:183452014-06-18T00:33:44Z https://repository.ugm.ac.id/18345/ Development of the bed load transport equation for nonuniform sediment in mountain rivers Perpustakaan UGM, i-lib Jurnal i-lib UGM Developing a bed load transport for size fractions requires an understanding of basic theory for the properselection of independent variables. To evaluate the selected independent variables as predictors of bed load transport equation, a linear regression procedure was initially chosen. Development of the equation for bed load transport by size fraction in this study was based on element of three equations of bed load transport. The first is the Schoklitsch (1962) total bed load transport equation, which uses only one single size diameter D40 and neglects the proportion of bed load and bed material in each size fraction, but involves channel slope. The second equation is the bed load transport equation of Shih and Komar (1990) in which the proportion of bed load in each size fraction is used to obtain the bed load transport for each size fraction. The effect of the bed load size distribution is considered, but the effect of the bed material size distribution and channel slope are neglected. The third equation is the bed load transport equation of Wilcock and Southard (1989) in which both proportions of size fraction, in the bed load and in the bed material are used to calculate the bed load transport by size fraction. However, the equation of Wilcock and Southard was based on laboratory data where the size distribution of the bed load was similar to the size distribution of the bed material. It therefore needs to be compared with data from natural rivers where the bed load size distribution generally narrower than the bed material size distribution. General relationships of the bed load transport for individual size fractions as well as total bed load transport have been developed. The approach of the relationships is the water discharge approach, which may be more appropriate for steep channels with coarse non-uniform materials characteristic of mountain regions, than one based on shear stress. Three parameters have been considered (channel slope, bed material and bed load size distribution) involve together in the equations. This basis may not be found in the previous equations for bed load transport. Independent tests the observed data for bed load transport for individual size fractions are in a good agreement with the values obtained by derived equation, which provides encouraging support for the relationship. Key Words: Bed load transport - nonuniform sediment - civil engineering [Yogyakarta] : Universitas Gadjah Mada 2000 Article NonPeerReviewed Perpustakaan UGM, i-lib (2000) Development of the bed load transport equation for nonuniform sediment in mountain rivers. Jurnal i-lib UGM. http://i-lib.ugm.ac.id/jurnal/download.php?dataId=1128 |
| spellingShingle | Jurnal i-lib UGM Perpustakaan UGM, i-lib Development of the bed load transport equation for nonuniform sediment in mountain rivers |
| title | Development of the bed load transport equation for nonuniform sediment in mountain rivers |
| title_full | Development of the bed load transport equation for nonuniform sediment in mountain rivers |
| title_fullStr | Development of the bed load transport equation for nonuniform sediment in mountain rivers |
| title_full_unstemmed | Development of the bed load transport equation for nonuniform sediment in mountain rivers |
| title_short | Development of the bed load transport equation for nonuniform sediment in mountain rivers |
| title_sort | development of the bed load transport equation for nonuniform sediment in mountain rivers |
| topic | Jurnal i-lib UGM |
| work_keys_str_mv | AT perpustakaanugmilib developmentofthebedloadtransportequationfornonuniformsedimentinmountainrivers |