Significant of Edge Waves and Shear Waves Essay

Significant of Edge Waves and Shear Waves - Essay Example Edge waves or low frequency gravity motion waves are water waves that are trapped at the shoreline by refraction. It is produce by the variability of wave energy reaching shore. An edge-wave is a low frequency wave attached to the beach. The edge waves have periods of a minute, a long-shore wave-length of around a kilometer, and amplitude that decays exponentially offshore as shown in figure 1 (Cutchin and Smith, 1973).While they were originally considered to be a curiosity, these waves play a significant role in near shore hydrodynamics. (Eckart C., 1951). The edge waves are modeled by creating incident waves that approach perpendicular to the direction of the constructed shoreline. The numerical modeling of edge waves was first described by Stokes equation in 1946. Shear Wave is also known as the voticity wave. The stability of a steady alongshore current V(x) to small perturbations using a linear vorticity equation based on the shallow water equations and the rigid-lid approximation. They showed that in the region of strong seaward shear (d|V|/dx pressure variance R, is 1 (i.e., equi-partitioning of kinetic and potential energy) independent of the mode mix. For shear waves , R = O(gh/V2), that is, 1 for natural alongshore currents with typically small Froude numbers (e.g., Oltman-Shay et al. 1989). Hence, can be used to estimate the contributions of gravity waves and shear waves to the infragravity band. If the gravity and shear wave velocity fluctuations are assumed to be statistically independent, then the fraction of the infragravity velocity variance contributed by shear waves is approximately given by = 1 1/R.(17). The effects of Shear and Edge Wave in the Environment The shape of the land under sea determines the strength and direction of the wave toward the coastline, while above ground it determines the run-up. Since the generation of a wave is defined by transferance of energy, or force in simple mathematical terms, the decrease in sea floor depth has the proportional effect of focusing and speeding up the movement of the wave. Thus a wave generated from a large, deep body of water will produce larger waves than those produced from a shallower body of water. Beach coastlines. As shown by Adams & Lewis, (1979) offshore coastline has a modifying effect on the wave shape as it breaks on land. The most destructive waves are where the force of the wave is focused as it breaks on l

Cultural Economy of the Media Essay Example | Topics and Well Written Essays - 2000 words

Cultural Economy of the Media - Essay Example This study stresses that  since advertisements and consumer culture is an ongoing system, customers must be constantly motivated to buy and spend more money on products. It follows then that new strategies must be used to hook these buyers by replacing old goods with new ones and also being constantly in touch with current trends in terms of goods and services. The need for new inventions has pushed the advertisement market into new heights whereby the targeted customers are confused. This means that the targeted clients are more likely to look for new adverts just like looking for new products. Indeed, overcoming ideas to circulation of capital has led to the rise of commodity culture based on a high turnover of signfieds and signifiers.As the research highlights that  hidden beneath the innovations that create new images and colourful presentations are less than normal and discontinuous stories which define the society. The excitement found in this adverts are packed through te chnological fantasy to suit different segments if client base. Recognisable and traditional representations in seasoned advertisements are usually anchored on a combination of new ideologies as well as enduring ideologies.  This then brings about the sense of contoured cultural meaning which integrates different meanings to bring about relativity and conventionalism.  Ã‚  It is not surprising that businesses usually exploit dominant ideologies at the expense of the important elements of promotion which are expected to be dominant in adverts. (Caraher, Landon an