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首页> 外文会议>IAHR congress >GEOMORPHIC AND GEOLOGICAL SOIL CHARACTERISTICS OF BANK-EROSION SITES ALONG THE UPPER MISSISSIPPI RIVER BETWEEN ST. PAUL, MINNESOTA AND CAIRO, ILLINOIS
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GEOMORPHIC AND GEOLOGICAL SOIL CHARACTERISTICS OF BANK-EROSION SITES ALONG THE UPPER MISSISSIPPI RIVER BETWEEN ST. PAUL, MINNESOTA AND CAIRO, ILLINOIS

机译：ST沿着上密西西比河上的银行侵蚀地貌与地质土壤特征。 Paul，Minnesota和Cairo，伊利诺伊州

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摘要

In order to assess existing river-bank conditions along the Upper Mississippi River reach between St. Paul, Minnesota and Cairo, Illinois at the Ohio River confluence, a field survey of bank-erosion sites was conducted during September and October 1995. Much of the bank erosion in the Corps of Engineers St. Paul District, the upper one-third of the reach, was found at dredged material placement sites and along Holocene-aged landscapes. In the Corps of Engineers Rock Island District reach, the middle reach, historical deposits were thicker along the channel margins, and erosion of Holocene surfaces was most severe in the upper portion of each pool. In the open-water reach downstream from St. Louis, the lower one-third of the reach, the continuous levee and open-water river system revealed significant re-working along the channel margins with scarps more than 6-m high, indicating frequent historical alluvial sequences. However, the Great Flood of '93 and the floods of '94 and '95, particularly along the middle and the lower study reaches, had left extensive erosion scours and encompassed most of the secondary failure and erosion features due to other causes. On the basis of the field investigation, approximately 14 percent of the Upper Mississippi River banks was estimated to be actively eroded as of 1995.
机译：为了评估沿于伊利诺伊州圣保罗，明尼苏达州和开罗之间的上层密西西比河沿线的现有河岸条件，伊利诺伊州俄亥俄州河流汇合，于1995年9月和10月进行了对银行侵蚀地点的田间调查。大部分在工程师圣保罗区兵团中的银行侵蚀，在挖掘材料放置网站和全新世老年景观中被发现。在工程师岩岛地区达到，中间距离，历史沉积物沿着通道边缘更厚，每个游泳池的上部侵蚀最严重。在ST.LOUIS下游的开放水中，连续的堤坝和开放式水域系统较低，透露沿着渠道边缘的显着重新工作，稀有6-m高，表明频繁历史肠序列。然而，'93的大洪水和洪水'94和'95，特别是沿着中间和较低的研究达到，留下了广泛的侵蚀冲刷，包括由于其他原因而受到大多数二次失败和侵蚀特征。在实地调查的基础上，大约14％的上部密西西比河银行估计截至1995年的积极侵蚀。

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