انجمن هیدرولیک ایران نشریه علمی هیدرولیک 2345-4237 3 3 2008 11 21 An Investigation into the Effects of the Experimentation Scale Upon Unsteady Non-Darcy Flows Through Rubble Mound Breakwaters بررسی اثر مقیاس در مطالعه آزمایشگاهی جریان های غیردارسی غیرماندگار گذرنده از موج شکن های توده سنگی 1 13 85470 10.30482/jhyd.2008.85470 FA صدف نظافت خواه حبیب الله بیات Journal Article 2008 03 22 As the pore pressure within core materials in rubble mound breakwaters affect the armours stability, it<br />is often necessary to consider scale effects when related designs call for a hydraulic model study based<br />on the Froude criterion. This paper describes findings of an analytical evaluation of unsteady<br />transitional flow regimes through coarse porous media in an attempt to develop a modelling law based<br />on similarities between hydraulic behaviours of the model and the prototype. A non-linear analysis<br />approach based on the so-called modified Forschhiemer equation has been employed in developing<br />necessary equations needed for scale effects assessments. It has been made clear that the grains scale<br />ratio is not a constant and its power varies with variations of the flow regime. The extent of the<br />validity of findings in enabling correct interpretation of experimental results have been examined<br />using available field data published by previous researchers for rubble mound structures. https://jhyd.iha.ir/article_85470_e0fc8d310d4c1d31fb6d4fe200cf4809.pdf