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Abstract of the Article

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Determining appropriate locations of gravel and sand extraction by using GSTR-1D

Authors:
[ Tarbon ] - Senior Engineer, Yekom Consulting Engineers
[ Sadeghi ] - Project Manager, Yekom Consulting Engineers
[ Tabatabai ] - Assistant Professor , power and Water University of Technology

Abstract:

In this research , GSTAR-1D has been utilized to specify locations of appropriate gravel and sand extraction. This model has special capabilities in comparison to other one – dimensional models. One of the most capabilities in comparison to other one-dimensional models. One of the most capabilities of this model is utilizing several dry zones to determine flow margins in each cross section. In this paper, results obtained from model runs in onereach of Aj chai river have been assessed . reach are 11.5 km long. The results have been presented as appropriate locations and allowable dimensions for gravel mining from river bed. Yang’s sediment transport equation was selected as the most suitable function for sediment transport. Bed material size frequency distribution was sampled in 44 cross sections. These were coupled up with strickler equation to work out manning’s roughness coefficients. In all the analysis , 2 and 25 years flood hydrographs were used for simulations . it is concluded that sedimentation occurs in downstream reaches, while erosion is noticeable in upstream reaches.

Keywords:

gravel and sand extraction , Ajichai river , sedimentation , erosion , numerical similation , GSTAR-1D