Changes in the Sediment Regime and Channel Morphology of the Lower Mississippi River

密西西比河下游沉积形态和河道形态的变化

• 批准号: 9012724
• 负责人: Richard Kesel
• 金额: $ 2.68万
• 依托单位: Louisiana State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-09-01 至 1992-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9012724&HistoricalAwards=false
• 关键词: Changes; Sediment; Regime; Channel; Morphology

Many stream channels have been modified significantly in the last century. Dams, levees, revetments, meander cut-offs, and reservoirs have been constructed to control floods and to improve navigation. These modifications have severely altered the morphology of the channels and have changed the patterns of erosion and sedimentation. The exact character of these changes is not well documented, however. Among the most drastically modified streams is the lower Mississippi River. This project will use historic hydrographic survey maps to measure changes in channel morphology and sediment regimes on the lower Mississippi over the last century. The data gathered in this project will also be used to analyze the degree to which human versus natural forces have altered flows and depositional patterns, and they will provide a basis for more detailed examination of the processes of meandering in large streams. This project will yield useful results at a number of levels. It will provide a data set specific to the lower Mississippi River. These data will be valuable aids to scholars studying this stream and to practitioners who must deal directly with flood control and navigation systems. The conclusions drawn in this project will also have broader significance, offering new insights into the processes by which stream flow and sediment transport respond to modification by humans and to changes in natural conditions.

在过去的几年里，许多河流通道都进行了重大修改。 世纪。 水坝、堤坝、护岸、曲流断流和水库 建造这些水坝是为了控制洪水和改善航行。 这些修饰严重改变了 改变了侵蚀和沉积的模式。 然而，这些变化的确切特征并没有很好的记录。 其中变化最大的河流是密西西比河下游 河 该项目将使用历史水文测量图， 测量下游河道形态和沉积物状况的变化 密西西比在过去的世纪。 本项目收集的数据 也将被用来分析人类与自然的对比程度 各种力量改变了水流和沉积模式， 为更详细地审查 在大的溪流中蜿蜒。 该项目将在若干层面产生有益的结果。 它 将提供密西西比河下游的特定数据集。 这些 这些数据将对研究这一河流的学者和 必须直接与防洪和航行打交道的从业人员 系统. 该项目得出的结论也将具有更广泛的 重要性，提供了新的见解的过程， 水流和泥沙输运对人类活动的影响， 自然条件的变化。