The hydro-geomorphologic complexity of the lower Amazon River floodplain and hydrological connectivity assessed by remote sensing and field control
The hydro-geomorphologic complexity of the lower Amazon River floodplain and hydrological connectivity assessed by remote sensing and field control
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DOI：
10.1016/j.rse.2017.06.021
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发表时间：
2017-09
影响因子：
13.5
通讯作者：
E. Park;E. Latrubesse
中科院分区：
文献类型：
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作者：
E. Park;E. Latrubesse
基于遥感和实测资料，分析了亚马逊河下游米拉图巴湖洪泛区（LMF）沿着的水文连通性过程。连通性过程与河漫滩的12个地貌子单元有关，这些子单元通过渠道化和漫滩流路径在不同阶段阈值相互连接，而湖泊则充当洪水沃茨、当地降雨和地下水位饱和渗流的水库。沿洪泛区沿着的水文连通性过程是通过水流在空间和时间上的复杂内部路径发生的，主要是沿洪泛区河道和决堤沿着。当地补给（主要是降雨）的贡献是脱钩河流补给（河流水文连接到洪泛区），因为降水和当地径流也补给洪泛区。的12个地貌单元的水文连通性显着不同，从对方，因为洪水泛滥和河漫滩与河流的连接开始在特定的河流阶段阈值为每个子unit.An有趣的发现是，所有单元与河流的连接开始通过以下的亚马逊河的bankfull阶段渠化流。不同地貌单元的连通性过程也不与它们离河流的最小距离（最短线）相关。这意味着，"洪水脉冲"模型主要涉及横向连通性（主要是通过漫滩扩散）仅部分解释了复杂的水文连通性过程在区域尺度上沿着复杂的亚马逊河下游洪泛区。因此，在亚马逊河洪泛区的水文连通性评估，达到了达到规模的研究必须进行，有关的水文地貌过程（渠道化的流量路由路径，漫滩扩散，和本地补给）的内部地貌的变化和复杂性的洪泛区。
Hydrological connectivity processes along the lower Amazon River floodplain at Lago Miratuba Floodplain (LMF) were analyzed based on remote sensing and field measurements. Connectivity processes are related to 12 geomorphic sub-units of the floodplain that are interconnected at different stage thresholds through channelized and overbank flow paths, while lakes act as reservoirs for flood waters, local rainfall, and water table saturation-seepage. Hydrological connectivity processes along the floodplain happen through complex internal routings of water flows over space and time, mainly along floodplain channels and breached levees. The contribution oflocal recharge(mainly rainfall) was decoupled fromriver recharge(river hydrological connection to floodplain) because precipitations and local runoff also recharge the floodplain. The hydrological connectivity of the 12 geomorphic units varied significantly from each other, because the inundation and the floodplain connections with the river were initiated at specific river stage thresholds for each sub-unit.An interesting finding is that connections with the river for all units were initiated through channelized flows below the bankfull stage of the Amazon River. The connectivity processes over different geomorphic units are also not correlated with their minimum distance (shortest lines) from the river. This implies that a “flood pulse” model largely concerned with lateral connectivity (mostly through overbank diffusion) only partially explains the complex hydrological connectivity processes at a regional scale along the complex lower Amazon River floodplain. Thus, for hydrological connectivity assessments in the Amazon River floodplain, reach-by-reach scale studies have to be carried out, relating the hydro-geomorphologic processes (channelized flow routing paths, overbank diffusion, and local recharge) to the internal geomorphic variability and complexity of the floodplain.