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首页> 外文期刊>Ocean Dynamics >Sediment source, turbidity maximum, and implications for mud exchange between channel and mangroves in an Amazonian estuary
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Sediment source, turbidity maximum, and implications for mud exchange between channel and mangroves in an Amazonian estuary

机译：沉积物来源，最大浑浊度及其对亚马逊河口河道与红树林之间泥浆交换的影响

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The tide-dominated eastern sector of the Brazilian Amazonian coast includes large mangrove areas and several estuaries, including the estuary associated with the Urumaj River. There, the dynamics of suspended sediments and delivery mechanisms for mud to the tidal flats and mangroves are complex and were investigated in this study. Four longitudinal measuring campaigns were carried out, encompassing springeap tides and dry/rainy seasons. During spring tides, water levels were measured simultaneously at 5 points along the estuary. Currents, salinity, and suspended sediment concentrations (SSCs) were measured over the tidal cycle in a cross section at the middle sector of the estuary. Results show a marked turbidity maximum zone (TMZ) during the rainy season, with a 4-km upstream displacement from neap to spring tide. During dry season, the TMZ was conspicuous only during neap tide and dislocated about 5 km upstream and was substantially less apparent in comparison to that observed during rainy season. The results show that mud is being concentrated in the channel associated with the TMZ especially during the rainy season. At this time, a substantial amount of the mud is washed out from mangroves to the estuarine channel and hydrodynamic/salinity conditions for TMZ formation are optimal. As expected, transport to the mangrove flats is most effective during spring tide and substantially reduced at neap tide, when mangroves are not being flooded. During the dry season, mud is resuspended from the bed in the TMZ sector and is a source of sediment delivered to the tidal flats and mangroves. The seasonal variation of the sediments on the seabed is in agreement with the variation of suspended sediments as well.
机译：潮汐主导的巴西亚马逊河沿岸的东部地区包括大片红树林地区和几个河口，包括与乌鲁玛杰河有关的河口。那里，悬浮沉积物的动力学和泥浆向潮滩和红树林的输送机制是复杂的，并在此研究中进行了研究。进行了四次纵向测量，包括春季/春季潮汐和干旱/雨季。在春季潮汐期间，沿河口同时在5个点测量了水位。在河口中间扇形断面的整个潮汐周期内测量洋流，盐度和悬浮泥沙浓度（SSC）。结果表明，在雨季，最大浊度带（TMZ）显着，从潮汐到春季潮汐有4 km的上游位移。在干旱季节，TMZ仅在潮汐时显着，并向上游移动约5 km，与雨季相比，明显不那么明显。结果表明，泥浆正集中在与TMZ相关的河道中，特别是在雨季期间。此时，大量的泥浆从红树林被冲到河口通道，形成TMZ的流体动力/盐度条件是最佳的。不出所料，春季红潮期间向红树林单位的运输最为有效，而在未淹没红树林的潮汐潮时，运输则大大减少。在干旱季节，泥浆会从TMZ区的河床中重新悬浮，成为输送到滩涂和红树林的泥沙来源。海底沉积物的季节变化也与悬浮沉积物的变化一致。

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