انجمن هیدرولیک ایران نشریه علمی هیدرولیک 2345-4237 4 2 2009 08 23 Comparison of Deterministic and Stochastic Criteria for the Initiation of Sediment Motion in Tidal Basins مقایسه معیارهای قطعی و غیرقطعی آغاز حرکت ذرات رسوب دانه ای در حوضچه های جزر و مدی 45 57 85522 10.30482/jhyd.2009.85522 FA حنیفه ایمانیان 0000-0001-5022-1993 مرتضی کلاهدوزان دانشگاه امیرکبیر-دانشکده عمران و محیط زیست Journal Article 2009 03 23 Current study is refinement and application of a two-dimensional horizontal numerical model to<br />predict geo-morphological changes in tidal basins. An ADI finite difference algorithm has been used<br />for solving the governing equations, which consist of the conservation of mass and momentum for the<br />hydrodynamics, the transport equation for suspended sediment fluxes and the sediment mass<br />conservation equation for bed level changes. The model includes three criteria for the initiation of<br />motion (i.e. Shields (1936), Kolahdoozan (1999) and Zanke (2003)). Since the flow is turbulent, its<br />components have a random nature and sediment transport processes can be expressed by stochastic<br />approaches. In this study both deterministic and stochastic methods were included in bed load<br />computations. Verification of model results have been carried out by an experimental study cited in<br />the literature. Comparisons of results for different criteria for the initiation of motion shows that the<br />unsteadiness parameters of current have a major effect on the bed level changes in comparison with<br />turbulence structure of the flow. https://jhyd.iha.ir/article_85522_5f00d4ad44b1e476da6d9a13aaf73f20.pdf