Narrow Results

This exploration aims to transfer, process and store multimedia information timely, accurately and comprehensively through computer comprehensive technology processing, and organically combine various elements under the background of big data analysis, so as to form a complete intelligent platform design for multimedia information processing and application. In this exploration, the intelligent vehicle monitoring system is taken as an example. Data acquisition, data transmission, real-time data processing, data storage and data application are realized through the real-time data stream processing framework of $\mathrm{\text{Flume}}+\mathrm{\text{Kafka}}+\mathrm{\text{Storm}}$ of big data technology. Data interaction is realized through Spring, Spring MVC, VUE front-end framework, and Ajax asynchronous communication local update technology. Data storage is achieved through Red is cache database, and intelligent vehicle operation supervision system is achieved through multimedia information technology processing. Its purpose is to manage the vehicle information, real-time monitor the running state of the vehicle and give an alarm when there are some problems. The basic functions of vehicle operation monitoring and management system based on big data analysis are realized. The research on the design of vehicle operation monitoring and management system based on big data analysis shows that big data technology can be applied to the design of computer multimedia intelligent platform, and provides a reference case for the development of computer multimedia intelligent platform based on big data analysis.

Erosion of the nourished beach in Bethany Beach in Delaware is examined using available beach profile, wave and tide data during September 2007 to September 2010. The volume of the placed sand with the median diameter of 0.31 mm was about 500 m³/m along the curved shoreline of 1.8 km length. The placed sand volume along this shoreline decreased to approximately 30% for the duration of 2.5 years. The nourished beach was attacked by two severe storms in May 2008 and November 2009. The eroded sand volume above the mean sea level (MSL) was about 70 m³/m for each of the two storms and emergency repairs were necessary. The recovery after the first storm was about 8 m³/m above MSL and much smaller than the eroded volume probably because the large placed sand volume resulted in the relatively steep eroded profile below MSL. The numerical cross-shore model with multiple cross-shore lines is used to compute the cross-shore and longshore sediment transport. The decrease of the placed sand volume is found to be caused partly by the increase of the longshore sand transport in the downdrift direction. The beach erosion by the two storms is shown to be caused by the offshore sand transport and the alongshore gradient of the longshore sand transport rate. The small recovery after the first storm is difficult to reproduce without increasing the onshore bed load transport rate by a factor of 2.

Large coral boulders are usually deposited in coastal regions due to high-energy inundation events, such as tsunamis or storms. The study on physical mechanisms is an important issue in hydrodynamics and sedimentology. In this study, the dam break induced the transportation, and the initial movements of a boulder are simulated on a flatbed in a laboratory experiment using a microelectromechanical system (MEMS) and image analysis. The scaled-down modeled boulder made the three-dimensional reconstruction rebuild the shape and surface texture of a realistic boulder. The MEMS integrated with the modeled boulder autonomously measures the signals and numerically calculates corresponding postures and transportation in three submerged conditions of the modeled boulder in the hydrodynamic experiment. Experimental results show that the boulder transportation process is a typical two-dimensional general planar motion, which includes sliding along the transported direction and swaying around the $z$-axis. Rolling and saltation are not dominant modes in the experiment. The results show that a complete transportation includes a variable speed movement in the initial motion, acceleration–deceleration to the uniform motion, and boulder stopping in the destination. The transported velocities of the modeled boulder are smaller than wave celerities. The maximum/minimum velocities and displacements occur in the partially and fully submerged conditions, respectively. The adjustment of the boulder’s posture is completed in the initial motion, and then the boulder almost keeps the same posture to move forward to the end. Moreover, the boulder is not driven when the nondimensional water depth is close to the critical condition.

With the development of the Internet of Things, the influx of mass sensed data, and the bottleneck of relational databases in functions, performance and stability, the industry’s leading IT companies have started to abandon the technical architecture of single relational databases, and the upgrade, transformation and migration of the software and hardware architecture of existing systems with a soaring size data for processing. Storage in the information systems of the transportation industry have also become a priority. Taking the upgrade and transformation project for the real-time probe vehicle system of Beijing for instance, this paper describes the real-time computing and storage management dilemma in the traditional architecture of the urban transportation core business system, new architecture solutions, and the effect of enhancement after upgrade and transformation.

This paper examines profile equilibration and longshore spreading associated with beach nourishment based on weekly to monthly profile surveys along the west-central Florida coast. Profile equilibration occurred rapidly and was largely completed after the first post-fill storm, typically with the formation of a nearshore bar and the overall beach-profile slope approaching the pre-nourishment slope. The bar moved offshore and onshore in response to subsequent storm and calm-weather conditions, respectively, while shoreline position remains largely stable. Longshore spreading is strongly influenced by grain size. Fine sand (~ 0.20 mm) tends to be transported and deposited along the nearshore bar resulting in little change along the shorelines and on the dry beach. The coarser shell debris tends to spread along the shoreface through the growth of a diffusion spit, which abruptly changed the shoreline orientation at the ends of project.

This paper examines the two year temporal and spatial performance of several beach nourishment projects constructed in 2006 along three microtidal low-wave energy barrier islands in west central Florida, based on monthly surveys of 145 beach profiles. The performance relates to background transport gradients, localized morphology variations, and project length. The performance of the different projects varied spatially and temporally, relating to a shoreline orientation change of 65 degrees, variations in the general depth of the inner continental shelf, and longshore sediment transport interrupted by two tidal inlets. Short projects adjacent to inlets, with large longshore transport gradients, resulted in 20-70 % volume loss of the initial-fill after 2-years. Along the longer projects further from inlets, 80 % of the fill-volumes remained.