توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Effect of Space between Spur dikes on Scour in Flood Plain
اطلاعات انتشار: اولین کنفرانس بین المللی مدیریت منابع آب، سال
تعداد صفحات: ۷
This paper presents an experimental measuring scour depth at spur dikes ending in a straight compound channel with symmetrically enlarge floodplain over a fixed bed in upside and clear water(u\uc<1). The compound channel is composed by two elements, the main channel that contains the permanent and faster flow, and the floodplain which is often shallow and where there is a slowly flow. Reliable estimate of depth of scour are essential for the design, operation and stability of spur dikes in river with floodplain. In this paper, the effect of distance between spur dikes on flow pattern and erosion and deposition of the sediment due to spur dikes with installed space between spur dikes 2L and 3L (L= length of spur dikes) in floodplain, as semi circular end shape are compared and results of experimental are showed in figures and tables.<\div>

۲Local scour at single abutment in floodplain
اطلاعات انتشار: اولین کنفرانس بین المللی مدیریت منابع آب، سال
تعداد صفحات: ۷
Abutments support the ends of the bridge and transfer the loads from the superstructure into the ground. The abutments also support the bearing devices and the back walls Failure of bridges due to local scour has motivated many investigators to explore the causes of scouring and to predict the maximum scour depth at abutments. In this paper, set of experimental tests, which are done in SCWMRI in Tehran, are presents with 20 cm length, with rectangular end shape of abutments with three discharges. Experimental results indicate that, scour hole and sediment tail is deposited downstream of abutment were extended with increasing of the discharge.<\div>

۳simulation of high velocity flows in chutes with nonparallel sidewalls using upwind and central overlapping finite volumes
نویسنده(ها): ،
اطلاعات انتشار: سمپوزیوم برآورد عدم قطعیت در مهندسی سد، سال
تعداد صفحات: ۱۰
This paper presents the comparison between the numerical results of central and upwind results of a computational model which efficiently simulate super–critical free surface flow in channels with nonparallel side walls. This model computes water depth and velocity components in horizontal plane using shallow water continuity and equations motion in horizontal plane. This model evaluates twodimensional velocity patterns and shockwaves. The governing equations are discretized utilizing over lapping cell vertex finite volume method on triangular unstructured meshes. The numerical oscillations of explicit solution procedure are damped out using either artificial viscosity scheme or upwind averaging fluxes at control volume boundary edges. The algorithm of evaluation of the fluxes at edges and artificial dissipation terms at nodes is adopted for unstructured meshes. Using both techniques, no additional dissipation is introduced to the computed flow and shockwaves are simulated accurately. The efficiency of the model is improved using edge base data structure for addressing unstructured mesh details. The accuracy of results is assessd by simulating super–critical flow in two chute canal with expanded and contracted walls and using comparison of between the computation results with the reported experimental measurements.<\div>
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