Numerical simulation of flow for improved width of the shipwreck in the curvature of the Waal River in Netherlands by using of Groyns

One of the effective methods for protecting the shores of navigable rivers at the site of the arches is the use of groynes. In order to study a case in the Netherlands, a numerical study was carried out on the effects of using submerged vanes with vertical groynes on the protection of the Waal coast in Netherlands. In the present study, the numerical results of the impact of vertical groynes series with ۵ angular deviations were compared to the external arc wall with a length of ۲۵% channel width (۸۷.۵ m) and a spacing of ۵۹۵.۸۵۹ meters with a nonsubmerged vane at a distance of one fourth of the width of the internal arc with a full arc length of ۹۰ degrees are paid to the average velocity distribution and pressure in the arc of ۹۰ degrees, with a width of ۳۵۰ meters and a depth of ۴.۵ meters. The results of the study showed that the presence of groynes series causes uniformity of upstream velocity and high- velocity transmission from the inner arc to the middle of the canal. In the case of the presence of groynes in the outer arc with a submerged vane close to the inner arch, about one quarter of the width of the internal arc produces a counterflow stream that reduces the normal secondary flow in the bends of the river. Hence, the high- velocity current, which is driven radially to the inner shore, is diverted to the middle direction. So it will improve the sedimentation on the inner shore of the bend and scouring on the outer shore of the bend. In this way, the flow rate from the mean value of one meter per second reaches ۱.۹۸ m/s in the middle region and decreases from the sedimentation in this range.

کلیدواژه ها:

Groyne ، Flow Pattern ، Secondary Currents ، ۹۰ degree bend ، Waal river