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首页> 外文期刊>Journal of South American earth sciences >Crevassing and capture by floodplain drains as a cause of partial avulsion and anastomosis (lower Rio Pastaza, Peru)
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Crevassing and capture by floodplain drains as a cause of partial avulsion and anastomosis (lower Rio Pastaza, Peru)

机译：洪泛区排水沟造成的皱vas和捕获是部分撕脱和吻合的原因（秘鲁下里约帕斯塔萨）

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摘要

Avulsion is the main process at the origin of anastomosing rivers. This study illustrates 3 examples of avulsions resulting from crevasse splays evolving in anastomosed channels along the Rio Pastaza, a tropical humid river sourced in the Ecuadorian Andean Cordillera and flowing into the Amazonian foreland. The Lower Pastaza flows in an alluvial plain, with no tectonic influence and an average monthly rainfall equally distributed throughout the year. Based on the analysis of satellite image recorded over the period 1977-2008, three cases have been studied. The first one began in 1990 with crevassing of natural levees of the right bank of the Pastaza main channel and the formation of a small channel linking up with a pre-existing tributary to this main channel. A splay formed at the confluence beheaded the tributary which became an anabranch of the main river. Downstream, two other avulsions developed from crevasse splays on a low gradient flood-plain. In both cases, capture of one of the distributary channels flowing on the splay by a pre-existing drain of the floodplain and consecutive headward erosion arrives to disconnect the other drains and capture their flow into a single-thread channel. As this channel rejoins the Pastaza main channel downstream, this process gives rise to the larger-scale anastomosing system which characterizes the lower reach of the Rio Pastaza.
机译：撕脱是河流吻合的主要过程。这项研究说明了3个示例，它们是由沿里奥帕斯塔萨河（Rio Pastaza）吻合的河道演变而成的裂缝撕裂所致。下帕塔萨（Pastzaza）在冲积平原上流动，没有构造影响，并且全年平均每月降雨量平均分布。在分析1977-2008年期间记录的卫星图像的基础上，研究了三种情况。第一个始于1990年，当时帕斯塔萨主河道右岸的天然堤坝开裂，并形成了一条小河道，该河道与该主河道的先前支流相连。汇合处形成八字形，将支流斩首，支流成为主河的支流。下游，在低坡度洪泛平原上，裂隙张开形成了另外两个撕脱。在这两种情况下，洪泛区的既有排水口都捕获了在八角上流动的分流水道之一，并且连续的向前冲蚀作用使其他排水口断开，并将它们的水流捕获为单线程水道。当此河道重新连接到下游的Pastaza主河道时，此过程产生了较大规模的吻合系统，这是Rio Pastaza下游河段的特征。

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  • 来源
    《Journal of South American earth sciences》 |2013年第7期|63-74|共12页
  • 作者

    Carolina Eternal; Frederic Christophoul; Jose Darrozes; Alain Laraque; Luc Bourrel; Jean-Claude Soula; Jean-Loup Guyot; Patrice Baby;

  • 作者单位

    UMR 5563 GET, Universite de Toulouse - CNRS - IRD - CNES, 14 Av., Edouard Belin, F-31400 Toulouse, France;

    UMR 5563 GET, Universite de Toulouse - CNRS - IRD - CNES, 14 Av., Edouard Belin, F-31400 Toulouse, France;

    UMR 5563 GET, Universite de Toulouse - CNRS - IRD - CNES, 14 Av., Edouard Belin, F-31400 Toulouse, France;

    UMR 5563 GET, Universite de Toulouse - CNRS - IRD - OMP - CNES, 14 Avenue Edouard Belin, 31400 Toulouse, France;

    UMR 5563 GET, University de Toulouse - CNRS - IRD - OMP, 14 Avenue Edouard Belin, 31400 Toulouse, France;

    UMR 5563 GET, Universite de Toulouse - CNRS - IRD - CNES, 14 Av., Edouard Belin, F-31400 Toulouse, France;

    IRD Brasil, CP 7091 - Logo Sul 71619-971 - Brasilia (DF), Brazil;

    IRD, 14 Av. Edouard Belin, F-31400 Toulouse, France;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Crevasse splay; Avulsion; Anastomosis; Amazonian basin; Floodplain; Pastaza;

    机译：裂痕张开;撕脱;吻合;亚马孙盆地洪泛区意大利面;

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