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首页> 外文期刊>Estuarine Coastal and Shelf Science >Riverine sediment inflow to Louisiana Chenier Plain in the Northern Gulf of Mexico
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Riverine sediment inflow to Louisiana Chenier Plain in the Northern Gulf of Mexico

机译：河流沉积物流入墨西哥北部湾路易斯安那州的谢尼尔平原

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The Louisiana Chenier Plain is a geomorphologic extension of the Mississippi Deltaic Plain, highly influenced by sediments originating from the Mississippi River. With the Mississippi River unable to avulse closer to the Plain local riverine sediment resources are integral to maintaining the physical and ecological integrity of the estuaries and marshlands. To gain insight into the sediment resources, this study assessed two decades (1990-2009) of discharge and total suspended solids (TSS) of four rivers, Sabine River, Calcasieu River, Mermentau River, and Vermilion River that flow into the Chenier Plain. The study quantified long-term sediment delivery, analyzed seasonal and inter-annual trends of sediment transport, and investigated the effect of hydrometeorological conditions on sediment yields. Total sediment delivery from the rivers over the 20-year period was 6.86 × 10~6 tonnes, with the Sabine River contributing 62% of the sediment load. The Sabine River also showed a significant decreasing trend (p = 0.03) in annual sediment yield. Long-term trends of sediment loads in all the rivers were influenced by their discharge, not their TSS concentrations. Annual mean sediment load was 342,950 tonnes with higher sediment loading during the winter and spring months and lower during the summer and fall months. Annual sediment inflow has the capacity to create 2.3 × 10~7 m~2 of land to the depth of 1 cm, but most of this sediment is unable to reach the coastline. The greatest asset that these rivers provide for the Chenier Plain is sediment and freshwater for restoration of marsh lost to salinization or inundation.
机译：路易斯安那州的谢尼尔平原是密西西比三角洲平原的地貌扩展，受密西西比河的沉积物影响很大。由于密西西比河无法向更靠近平原的地方抽水，当地河流沉积物资源对于维持河口和沼泽地的物理和生态完整性至关重要。为了深入了解沉积物资源，本研究评估了流入谢尼尔平原的四大河（萨宾河，卡萨西约河，梅门多河和朱红河）的二十年（1990-2009年）流量和总悬浮固体（TSS）。该研究量化了长期输沙量，分析了输沙量的季节性和年际趋势，并研究了水文气象条件对输沙量的影响。在20年的时间里，河流的总输沙量为6.86×10〜6吨，萨宾河贡献了62％的输沙量。萨宾河的年产沙量也显示出显着的下降趋势（p = 0.03）。所有河流的泥沙负荷的长期趋势受其流量的影响，而不是其TSS浓度的影响。年平均泥沙量为342,950吨，冬季和春季月份的泥沙含量较高，而夏季和秋季月份的泥沙含量较低。每年的泥沙流入量可以在2.3厘米×10〜7 m〜2的土地上形成1厘米深的土地，但是大部分泥沙无法到达海岸线。这些河流为谢尼尔平原提供的最大资产是沉积物和淡水，用于恢复盐碱化或淹没造成的沼泽。

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