Evaluation of the change in physical features of two over-wide channel stream relocation projects
Creators:Ketzer, Daniel T.
Advisor:Ward, Andrew D.
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Publisher:The Ohio State University
Series/Report no.:The Ohio State University. Department of Food, Agricultural and Biological Engineering Honors Theses; 2007
The over-wide channel design is a recent, innovative, channel modification design. In this design, the channel is constructed as a wide, flat trapezoid at the channel bed elevation. The theory behind the design states that over time, floodplain benches will form, creating a stable two-staged geometry with a functional floodplain. This design could function as a stormwater management practice designed to provide flood storage and channel protection. This study begins the process of gathering data to create a database to (1) evaluate whether following construction the evolution of over-wide channels is consistent with theory; and (2) if the channel does evolve according to theory, to initiate the work necessary to determine how quickly it will take for an over-wide channel to evolve into a two-stage system. The parameters examined in this paper are geomorphology, turbidity, and sequential photographs. This study examined two study sites; Clover Groff Run and a tributary to Big Walnut Creek. While little change was observed at the Clover Groff Run site, the formation of a small inset channel and attached floodplain system was observed at the Big Walnut Creek study site. This channel was 8 feet wide and 0.75 feet; within the predicted range of the design. While aggradation and down-cutting were both observed at the study site, the measured inset channel was formed predominantly by down-cutting. Future studies are needed to definitively quantify the evolution of over-wide channels. Advisor: Andrew D. Ward
Ohio Agricultural and Research Development Center
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