@article { author = {Toozandehjani, Mohamad and Haghiabi, Amir Hamzeh and Kashefipour, Mahmood and Turabi Podeh, Hasan}, title = {Investigation the effect of the height and distance of successive obstacles on the control of density current}, journal = {Irrigation Sciences and Engineering}, volume = {45}, number = {4}, pages = {1-14}, year = {2023}, publisher = {Shahid Chamran University of Ahvaz}, issn = {2588-5952}, eissn = {2588-5960}, doi = {10.22055/jise.2018.26213.1782}, abstract = {Obstacle usually blocks the current and it has been found by other researchers an obstacle with a height more than two times of body height of flow is necessary to fully block the density current. The construction of an obstacle with this elevation creates problems in terms of performance and sustainability as well as the accumulation of sediments behind it.Rottman et al. (1985) solved the analytical solution of the two-phase current in a horizontal slope with an obstacle in the steady and unsteady flow and concluded that if the height of the obstacle is twice the body height of the density current so the density current is completely blocked. Prinos (1999) conducted studies on the effect of the shape of the obstacle on the current control. In his experiments, he used two semi-circular and triangular obstacles with the same height and concluded that the shape does not have a significant effect on the control of high current. Also, in the range of densimetric Froude number, 0.7 < Frd < 0.8 if the height of the obstacle is twice the height of the body of the density current, the current will be fully restrained. As it has been stated, for a complete block of density current, based on the results of previous investigators, the height of the obstacle should be at least twice the height of the body.The purpose of this study is to use successive obstacles with lower height, with greater sustainability and lower cost, in controlling density current. For this purpose, in different conditions, in terms of slope and concentration, three rows of obstacles with different heights and also different distances were used to control sedimentary and salty density current.}, keywords = {Useful life,Dam reservoir,slope,Sediments,Density}, title_fa = {بررسی تأثیر ارتفاع و فاصله موانع متوالی در کنترل جریان غلیظ}, abstract_fa = {یکی از مهم­ترین عوامل کاهش عمر مفید سدها، جریان غلیظ است که عامل اصلی حرکت رسوبات در مخازن سدها می باشد. جریان غلیظ پدیده­ای است که به خاطر تغییرات چگالی بین دو سیال به­وجود می­آید. در مقاله حاضر تأثیر ارتفاع و فواصل موانع متوالی در کنترل جریان غلیظ بررسی می­شود. بدین منظور از سه ردیف مانع با چهار ارتفاع و سه فاصله برای موانع و نیز سه شیب و دو غلظت استفاده شده است. جریان غلیظ استفاده شده هم از نوع نمکی بوده و هم از نوع رسوبی. در مجموع 108 آزمایش به همراه 9 آزمایش شاهد انجام شد. با توجه به تحقیقات گذشته حداقل ارتفاع یک مانع برای کنترل کامل جریان غلیظ باید دو برابر ارتفاع جریان غلیظ باشد که در تحقیق حاضر نتایج نشان داد که می­توان با موانعی به ارتفاع یک برابر ارتفاع بدنه جریان غلیظ، تا 99 درصد جریان غلیظ را کنترل کرد. همچنین نتایج نشان داد که در سه ردیف مانع، تأثیر فاصله مانع اول و دوم مهمتر بوده و هرچه این فاصله بیشتر باشد کنترل جریان غلیظ نیز بیشتر است.}, keywords_fa = {Useful life,Dam reservoir,slope,Sediments,Density}, url = {https://jise.scu.ac.ir/article_14299.html}, eprint = {https://jise.scu.ac.ir/article_14299_41ac7d36bd45b1203d293c640c7b6676.pdf} }