Nutrient dynamics in the lower Mississippi River floodplain: Comparing present and historic hydrologic conditions

Wetlands ◽  
2009 ◽  
Vol 29 (2) ◽  
pp. 476-487 ◽  
Author(s):  
Harold L. Schramm ◽  
Michael S. Cox ◽  
Todd E. Tietjen ◽  
Andrew W. Ezell
Keyword(s):  
Mississippi River ◽  
Nutrient Dynamics ◽  
River Floodplain ◽  
Lower Mississippi River ◽  
Hydrologic Conditions

Evidence of an Agricultural Heat Island in the Lower Mississippi River Floodplain

1994 ◽  
Vol 75 (6) ◽  
pp. 1019-1025 ◽  
Author(s):  
William H. Raymond ◽  
Robert M. Rabin ◽  
Gary S. Wade
Keyword(s):  
Mississippi River ◽  
Heat Island ◽  
River Floodplain ◽  
Lower Mississippi River

Fishery Resources, Environment, and Conservation in the Mississippi and Yangtze (Changjiang) River Basins

2016 ◽  
Keyword(s):  
Gulf Of Mexico ◽  
Mississippi River ◽  
Ohio River ◽  
Mississippi Valley ◽  
River Floodplain ◽  
Vegetation Communities ◽  
Deltaic Plain ◽  
Sediment Loads ◽  
Lower Mississippi River ◽  
Flood Pulses

<em>Abstract</em>.—The lower Mississippi River encompasses the 1,535-km reach extending from the confluence with the Ohio River at Cairo, Illinois to the Gulf of Mexico. Waters of the lower Mississippi River have historically inundated vast areas of adjacent floodplain during spring flood pulses. Additionally, processes of land building within the river’s deltaic plain supported vast forests and diverse freshwater and salt-marsh habitats. Flood pulses provided a mechanism of lateral exchange of energy and nutrients between the aquatic and terrestrial habitats, while sediment loads continually rebuilt and supported the deltaic plain. As human populations and agriculture expanded throughout the lower Mississippi Valley, construction of flood-protection levee systems and commercial navigational structures severely decreased the connectivity between the lower Mississippi River and its floodplain. The current lower Mississippi River floodplain is more than 90% reduced in area compared to historical conditions. Fluvial dynamics, which are the driving forces that stimulate floodplain function and create diverse habitats, appear to have been altered throughout approximately 80% of the river. As a result, the hydrograph, thermograph, sedimentation patterns, nutrient dynamics, and vegetation communities within the lower Mississippi River floodplain have experienced major changes through time, with many large alterations occurring during the past century. In addition, because most of the sediment load of the lower Mississippi River now enters the northern Gulf of Mexico, land building and associated processes are much reduced in the river’s deltaic plain. This process has allowed intrusion of saltwater into coastal habitats, which has heavily impacted vegetation communities. This paper reviews the consequences of river modification to lower Mississippi River floodplain, current efforts towards restoring the floodplain and deltaic plain, and proposes future strategies towards restoring portions of the historical floodplain.

Temporary connectivity: the relative benefits of large river floodplain inundation in the lower Mississippi River

2014 ◽  
Vol 23 (1) ◽  
pp. 53-56 ◽  
Author(s):  
Quinton E. Phelps ◽  
Sara J. Tripp ◽  
David P. Herzog ◽  
James E. Garvey
Keyword(s):  
Mississippi River ◽  
Large River ◽  
River Floodplain ◽  
Floodplain Inundation ◽  
Lower Mississippi River

High-Water Protection Methods on Lower Mississippi River

1900 ◽  
Vol 50 (1301supp) ◽  
pp. 20848-20850
Author(s):  
William Joseph Hardee
Keyword(s):  
Mississippi River ◽  
High Water ◽  
Water Protection ◽  
Lower Mississippi River
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