美国伊利诺斯州亚历山大县修复后的Len Small大堤为何在重大洪水事件中继续决口?

Kenneth Ray Olson, David R. Speidel
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引用次数: 3

摘要

人们只需要研究古代密西西比河和俄亥俄河的土壤和地质历史以及位置,就可以理解为什么Len Small堤坝如果修补就会继续失效。位于伊利诺伊州亚历山大县的Dogtoth Bend大部分地区最初位于古俄亥俄河谷(图1),冲积沉积物位于与古密西西比河交汇处的北部和东部。古老的俄亥俄河谷土壤位于冲积沉积物之下,很容易被重新排列的现代密西西比河侵蚀,密西西比河现在流经基岩控制的底比斯峡谷(图2),进入古老的俄亥俄河河谷。本文的主要目标是:1)解释为什么美国伊利诺伊州亚历山大县的Len Small大堤如果修复,将在重大洪水事件中继续溃堤;2)开发一种新的凸起堤道和大堤系统,该系统将提供密西西比河洪水绕行,具有可持续性,鼓励并资助土地利用变化,恢复退化的公路路基,保护尚未因过去的洪水事件而退化的Dogtoth Bend农场和农田,并在密西西比河和俄亥俄河交汇处的重大洪水事件期间提供洪水储存。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Why Does the Repaired Len Small Levee, Alexander County, Illinois, US Continue to Breach during Major Flooding Events?
One only needs to study the soil and geologic history and location of the ancient Mississippi and Ohio Rivers to understand why Len Small levee if patched will continue to fail. Much of Dogtooth Bend located in Alexander County, Illinois was originally in the ancient Ohio River valley (Figure 1) alluvial sediments north and east of the confluence with the ancient Mississippi River. The ancient Ohio River valley soils underlain by alluvial sediments and have been easily eroded by the re-aligning modern Mississippi River which now travels through the bedrock controlled Thebes Gap (Figure 2) and into the Ancient Ohio river valley. The primary objectives of this paper are: 1) to explain why Len Small levee, Alexander County, Illinois, US will continue to breach during major flooding events if repaired and 2) to develop a new combined raised causeway and levee system which will provide a Mississippi River floodwater bypass, be sustainable, encourage and fund a land use change, restore the degraded highway road beds, protect remaining Dogtooth Bend farmsteads and farmland that have not yet been degraded by past flooding events and provide floodwater storage during major flooding events at the confluence of the Mississippi and Ohio Rivers.
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