Effect of Dike Notching on Missouri River Bank Stabilization and Navigation Project
Publication: World Environmental and Water Resources Congress 2022
ABSTRACT
In this study, a two-dimensional hydrodynamic model was developed using the Hydrologic Engineering Center’s River Analysis System (HEC-RAS) to evaluate notch impacts on water levels and sedimentation processes. The study site includes an approximately 2-mi stretch of the Missouri River with a dike field, including eight spur dikes with notches and three spur dikes without notches. Elevation contours of the existing condition digital terrain model were modified by performing geospatial operations in the vicinity of each notch to create two additional terrain conditions—proposed conditions 1 (filled notches with filled scour holes downstream of each notch) and proposed conditions 2 (filled notches with existing scour holes downstream of each notch). Four flow events were modeled at each terrain condition to account for different dike overtopping ratios. The model results of each proposed condition were compared with the existing condition near the dike, at the downstream riverbank, and at the navigation channel for each notched dike. Results indicated that filling the notch and scour hole causes higher degradation rates in the navigation channel, decreased bank scour downstream of each notch, and high variability in hydraulic stresses on the dike structures.
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World Environmental and Water Resources Congress 2022
Pages: 282 - 296
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Published online: Jun 2, 2022
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