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首页> 外文期刊>Ecological engineering: The Journal of Ecotechnology >Sediment and nutrient trapping as a result of a temporary Mississippi River floodplain restoration: The Morganza Spillway during the 2011 Mississippi River Flood
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Sediment and nutrient trapping as a result of a temporary Mississippi River floodplain restoration: The Morganza Spillway during the 2011 Mississippi River Flood

机译：密西西比河临时漫滩恢复造成的泥沙和养分截留：2011年密西西比河洪水期间的摩根扎溢洪道

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The 2011 Mississippi River Flood resulted in the opening of the Morganza Spillway for the second time since its construction in 1954 releasing 7.6 km(3) of water through agricultural and forested lands in the Morganza Floodway and into the Atchafalaya River Basin. This volume, released over 54 days, represented 5.5% of the Mississippi River (M.R.) discharge and 14% of the total discharge through the Atchafalaya River Basin (A.R.B.) during the Spillway operation and 1.1% of the M.R. and 3.3% of the A.R.B. 2011 water year discharge. During the release, 1.03 teragrams (Tg) of sediment was deposited on the Morganza Forebay and Floodway and 0.26 Tg was eroded from behind the Spillway structure. The majority of deposition (86 %) occurred in the Forebay (upstream of the structure) and within 4 km downstream of the Spillway structure with minor deposition on the rest of the Floodway. There was a net deposition of 26 x 10(-4) Tg of N and 5.36 x 10(-4) Tg of P, during the diversion, that was equivalent to 0.17% N and 0.33% P of the 2011 annual M.R. load. Median deposited sediment particle size at the start of the Forebay was 13 mm and decreased to 2 mm 15 km downstream of the Spillway structure. Minimal accretion was found greater than 4 km downstream of the structure suggesting the potential for greater sediment and nutrient trapping in the Floodway. However, because of the large areas involved, substantial sediment mass was deposited even at distances greater than 30 km. Sediment and nutrient deposition on the Morganza Floodway was limited because suspended sediment was quickly deposited along the flowpath and not refreshed by incremental water exchanges between the Atchafalaya River (A.R.) and the Floodway. Sediment and nutrient trapping could have been greater and more evenly distributed if additional locations of hydraulic input from and outputs to the A.R. (connectivity) were added. Published by Elsevier B.V.
机译：2011年密西西比河洪水导致Morganza溢洪道自1954年修建以来第二次开放，通过Morganza洪泛区的农业和林地向Atchafalaya流域释放7.6 km（3）的水。在54天的时间内释放的水量，在溢洪道运营期间占密西西比河（M.R.）的5.5％，通过阿恰法拉亚河流域（A.R.B.）的总排放量的14％，M.R。的1.1％和A.R.B的3.3％。 2011水年度排放量。在释放过程中，1.03兆克（Tg）的沉积物沉积在Morganza前湾和洪水道上，而0.26 Tg从溢洪道结构的后面被侵蚀。大部分沉积物（86％）发生在前湾（结构上游）和溢洪道结构下游4 km以内，其余的沉积物则发生在溢洪道的其余部分。在转移过程中，N的净沉积量为26 x 10（-4）Tg，P的净沉积量为5.36 x 10（-4）Tg，相当于2011年度M.R.负荷的0.17％N和0.33％P。在前湾开始时，沉积沉积物的中位粒径为13 mm，在溢洪道结构下游15 km处减小至2 mm。在该结构的下游超过4 km处发现了最小的吸积，这表明在洪水道中可能会有更大的沉积物和养分捕获。但是，由于涉及的区域很大，因此即使在大于30 km的距离处也沉积了大量的沉积物。 Morganza洪道上的沉积物和养分沉积是有限的，因为悬浮的沉积物会沿着流径迅速沉积，并且不会因Atchafalaya河（A.R.）和该洪道之间的增量水交换而更新。如果从A.R.到A.R.的水力输入和输出的其他位置，则沉积物和养分的捕获可能会更大，分布更均匀。 （连接性）已添加。由Elsevier B.V.发布

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