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首页> 外文期刊>Shore and beach >Monitoring of recent morphological changes of the dune of Vougot Beach (Brittany, France) using Differential GPS
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Monitoring of recent morphological changes of the dune of Vougot Beach (Brittany, France) using Differential GPS

机译：使用差分GPS监测Vougot海滩（法国布列塔尼）沙丘的近期形态变化

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摘要

The dune of Vougot beach is a massive drifting sand body approximately 250 to 400 m wide and 2 km long. It is located in the municipality of Guisseny, on the north coast of Finistere (Brittany). This dune, with a southwest to northeast position, protects a vast polder area which was disconnected from the sea by a dike construction in 1834. For several decades the eastern part of this dune experienced erosion mainly due to the construction of an artificial jetty in 1974 (Curnic jetty), which entirely modified the hydrodynamics and sedimentation processes. In order to determine the actual trend of evolution, the advance rate, and the resultant sand drift that is occurring, a survey of the dune was achieved between 2004 and 2009. Shoreline changes were monitored on a yearly basis; in addition, two detailed topography surveys (2005 and 2009) were carried out. Topography surveys were made using a Trimble DGPS respectively with 5 cm and 1.5 cm of horizontal andrnvertical accuracy. Arc View GIS was used to process the data and display the results. Shoreline change rates were determined using Digital Shoreline Analysis (DSA) Arc View tools to measure erosion and accretion transects. 3D surface analysis was based on Digital Elevation Model (DEM) calculations using Surfer software. Foredune changes showed that dune evolution since 2004 is in accordance with the trend observed during the last decades. However, the speed of dune retreat has increased from 0.6 m/yr to 1.5 m/yr. The comparison between DEMs obtained from the 2005 and 2009 surveys confirmed this evolution. A volume of eroded sand from the dune amounting to -10,677 ± 110 m~3 with an erosion of the foreshore beach of -10,933 ± 1,396 m~3 was determined. These results confirm the fact that the Curnic jetty is constantly interrupting the sand drift inducing an increase in sediment loss from the Vougot beach/dune system.
机译：Vougot海滩的沙丘是一块巨大的漂沙体，宽约250至400 m，长2 km。它位于Finistere（布列塔尼）北海岸的吉塞尼市。这个沙丘具有西南到东北的位置，保护着广阔的田地区，该地区在1834年通过堤坝构造与海分离。几十年来，该沙丘的东部遭受侵蚀，这主要是由于1974年建造了人工码头（Curnic码头），完全改变了水动力和沉积过程。为了确定实际的演变趋势，前进速度以及由此引起的沙尘漂移，在2004年至2009年之间对沙丘进行了调查。此外，还进行了两次详细的地形调查（2005年和2009年）。使用Trimble DGPS分别进行了水平和垂直精度为5 cm和1.5 cm的地形测量。 Arc View GIS用于处理数据和显示结果。海岸线变化率是使用数字海岸线分析（DSA）弧形视图工具测量侵蚀和积积断面而确定的。 3D表面分析基于使用Surfer软件的数字高程模型（DEM）计算。 Foredune的变化表明，自2004年以来，沙丘的演变与最近几十年的趋势一致。但是，沙丘撤退速度已从0.6 m / yr增加到1.5 m / yr。从2005年和2009年的调查中获得的DEM之间的比较证实了这一演变。沙丘的侵蚀沙量为-10,677±110 m〜3，前滩的侵蚀量为-10,933±1,396 m〜3。这些结果证实了Curnic码头不断中断砂漂的事实，导致了Vougot海滩/沙丘系统沉积物损失的增加。

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  • 来源
    《Shore and beach》 |2010年第1期|37-47|共11页
  • 作者

    Serge Suanez; Jean-Marie Cariolet; Bernard Fichaut;

  • 作者单位

    GEOMER - UMR 6554 CNRS LETG, Universite de Bretagne Occidentale Institut Universitaire Europeen de la Mer, Technopole Brest-lroise, Place Nicolas Copernic, 29280 Plouzane, France;

    GEOMER - UMR 6554 CNRS LETG, Universite de Bretagne Occidentale Institut Universitaire Europeen de la Mer, Technopole Brest-lroise, Place Nicolas Copernic, 29280 Plouzane, France;

    GEOMER - UMR 6554 CNRS LETG, Universite de Bretagne Occidentale Institut Universitaire Europeen de la Mer, Technopole Brest-lroise, Place Nicolas Copernic, 29280 Plouzane, France;

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