Scour Analysis in High Vertical Drop Shallow Using Numerical and Physical Models
The "vertical drop Structure" is one of the basic types used in channel system flow. Drops are used as slope breakers in some parts of channels where we encounter supercritical slopes. Scour is a dynamic phenomenon that is visible in vertical drop tail water depth. Because of complexity of Scour process and simultaneous testing of variables' effective compliance, studies are still underway to determine the accuracy of the equations and provide possible explanation for this phenomenon. These investigations include field or laboratory experiments under special conditions where mathematical models have been often used to provide an explicit result. Using the laboratorial physical modeling, this research explores the impact of a vertical drop flow rate on the balance of forces at the scour depth below a high vertical drop . Satisparametery results have been obtained by changing several of the parameters like sediments grading, tail water depth and flow rate. In order to specify a set of effective parameters, dimensional analysis has been used to show the scour hole dimensions. Also, computer software FLOW-3D was used to simulate the numerical modeling of Scour below a high vertical drop. The data from numerical simulation is then compared with physical modeling resulting in the great compatibility and correlation.
Scour below a high vertical drop
Experimental results on scour below a high vertical drop (drop height/critical depth >1) in uniform sands and gravels are presented. The experimental results are used to describe the effects of important parameters, identified from the dimensional analysis, on equilibrium scour depth. The important observations are that the equilibrium scour depth increases with increase in densimetric Froude number, whereas the scour depth decreases with increase in sediment size and tailwater depth. The time scale of scour depth that follows an exponential law is determined. The nondimensional time scale decreases with increase in densimetric Froude number.
The Millennial of Castile (1943): the historical culture of Spanish Fascism
Abstract The creation of new symbols and historical myths were common practices of nationalist politics, especially in Fascist regimes. In 1943 the Franco regime organized the most impressive historical commemoration celebrated in post-war Spain: the Milenario of Castile. With its heterogeneous mixture of history and spectacle, the Milenario of Castile was by far the greatest historical commemoration promoted by the State during the 1940s. Taking the commemoration of the Milenario as a case study, this article examines the historical culture of Spanish Fascism, as well as the attempts of the Falangist intellectual elite to impose a concrete national narrative in post-war Spain. At the same time, the article analyses the historical discourses and aesthetics displayed throughout the commemoration, underlining its Fascist character, and consequently the transnational dimension of the Fascist politics of the past. Finally, the article reflects on the scope and limits of the process of Fascistisation in Franco's dictatorship, especially in its commemorative culture.