A moving circle and the words "uniform bedload transport" illustrate this.Īfter the channelization note bank failures both up and downstream, and that the channel slowly reestablishes a meandering form so that its overall length is about the same as before the channelization. Note the relative stability of the system before channelization, in which a small amount of sediment is moving through the reach, but there is little bank erosion and by one definition - sediment in = sediment out - the system is very stable. The playback speed varies and is noted on the video. In this case the channel length between two points is more than halved, so slope would increase by a factor of 2+. This is a time-lapsed Emriver channelization demonstration in which a meander loop is cut off. Emriver and the green meandering river logo are registered trademarks of Little River Research and Design.Ĭhannelization, large meanders (MP4 Video 27MB Jul27 17) All videography, post production work, and video descriptions were done by Steve Gough. For more information about these clips, contact the Missouri Department of Conservation Streams Unit, or email LRRD at Artita and Jesse Riechman assisted with this production, and Mike Covell of Southern Illinois University - Carbondale provided technical advice. The DVD contains a total of 59 videos and the Teaching Guide and can be obtained from the LRRD website. These videos and several more are available on a DVD from Little River Research and Design. These videos may be freely used and copied as long as they remain unchanged, with all logos and other graphics intact, and with acknowledgment of their creators and funding agencies. Many were made using the Emriver movable bed model. The US Environmental Protection Agency Region VII, through the Missouri Department of Natural Resources, provided partial funding for this project under Section 319 of the Clean Water Act. The clips were produced by Little River Research and Design (LRRD) under contract with the Missouri Department of Conservation. The clips are intended for use by an instructor. These videos were made to help students better understand geomorphic processes in rivers with special attention to the effects of channelization and gravel mining. In these short experiments, we are able to see the drastic difference vegetation has on riparian and shoreline erosion.Other Geomorphology Visualizations Introduction The beach eroded away considerably faster without mangroves and flooded the town. For our second experiment, we simulated a beachfront neighborhood with and without a mangrove forest. With each flood we observed the buffered meander retaining its position, while the non-buffered cut bank eroded away. The river has two meanders: one with vegetation and one without. For our first experiment, we observed a river channel as it underwent three floods. In the video below, we used our Em3 geomodel to experiment with the effects of riparian and shoreline vegetation. Our Emriver geomodels can provide impressive and accurate physical modeling of this phenomenon. Their results indicate that over extended time periods, riparian buffers could increase the economic returns of the plantations while at the same time meet some environmental sustainability and conservation goals. Using imagery and numerical modeling over a simulated 100-year period, they found the amount of land lost to lateral channel migration in the no-buffer scenario was significantly higher than the losses with a riparian buffer. sought to find if retaining riparian buffers along the rivers of tropical oil palm plantations (rather than bringing crops to the water’s edge) would be economically beneficial. Understanding and utilizing the benefits of riparian buffers can help improve conservation efforts and, according to a recent study, increase agricultural economic returns. Vegetation plays a large role in erosion regulation. By Erin Cotter, Research Assistant and Prototyper at LRRD
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