Landscape response to the intentional use of the Birds Point New Madrid Floodway on May 3, 2011

摘要: During the spring of 2011 massive, coalescing storm fronts in upper Mississippi, and Ohio River basins caused extreme weather conditions that flooded bottleneck section Mississippi vicinity Cairo, IL. In order to alleviate volume floodwaters acting on downstream levees stop flooding near IL, US Army Corps. Engineers activated Birds Point New Madrid Floodway by intentionally breaching Levee, releasing onto active agricultural fields. The impacts floodwater landscape were regionally significant. Concentrated erosion generated deep scour holes, rills, gullies localized areas floodway. Inflow outflow waters formed large deposits sands gravels. Sand sheets a few centimeters meter thick blanketed impacted areas, some cases sand accumulations exhibited current ripples indicating multiple flow directions. This study directly addresses geomorphic changes resulting from activation diversion River. Results this can be used along with other field data conduct thorough flood damage assessment includes costs associated alteration within