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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Morphometric indices as indicators of tectonic, fluvial and karst processes in calcareous drainage basins, South Menorca Island, Spain
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Morphometric indices as indicators of tectonic, fluvial and karst processes in calcareous drainage basins, South Menorca Island, Spain

机译：形态计量学指标作为钙质流域盆地构造，河流和岩溶过程的指标，西班牙南梅诺卡岛

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摘要

This study proposes using morphometric indices to discriminate the processes that shape calcareous drainage basins. To illustrate this, a DEM of the southern part of Menorca Island (Migjorn) was created and basin slope, drainage density, hypsometric curve and integral, and the area occupied by open and closed dolines were extracted from it. These indices show an important dependence on tectonics, which govern the morphology of these drainage basins and encourage the predominance of karst and/or fluvial processes in the different sectors. The morphometric indices are clearly influenced by the geological Migjorn structure, a carbonate Upper Miocene reef platform gently folded as an asymmetrical anticline. The hypsometric integral and curve discriminate the influence of tectonics and structure whilst the drainage density and the proportion of open dolines are associated with basins with more pronounced fluvial processes. A cluster analysis based on these indices discriminated three sectors where different forms and processes are found. In the western and eastern sectors, rounded basins without major fractures predominate. The basins slope at less than 5 degrees, and karst processes outweigh fluvial processes. The central sector, however, has steeper slopes, a clearly defined drainage system, and a predominance of fluvial over karst processes. Greater uplift in this sector has facilitated the formation of elongated basins that follow the main fracture lines. Copyright (c) 2007 John Wiley & Sons, Ltd.
机译：这项研究建议使用形态计量学指标来区分形成钙质流域的过程。为了说明这一点，在梅诺卡岛（Migjorn）南部创建了DEM，并提取了盆地坡度，排水密度，水压曲线和积分，并从中提取了开放和封闭的do线所占的面积。这些指数显示出对构造的重要依赖，后者控制着这些流域的形态，并促进了不同部门的岩溶和/或河流作用。形态学指标明显受到地质Migjorn结构的影响，Migjorn地质结构是碳酸盐岩中上新世珊瑚礁平台，它被折叠成不对称的背斜。抽水法积分和曲线可区分构造和结构的影响，而排水密度和开放式菱形的比例则与盆地形成过程有关。根据这些指数进行的聚类分析将三个部门区别开来，这些部门找到了不同的形式和过程。在西部和东部地区，没有严重裂缝的圆形盆地占主导地位。盆地的倾斜度小于5度，岩溶过程胜于河流过程。然而，中部地区坡度较陡，排水系统明确，在喀斯特过程中主要以河床为主。该区域更大的隆升促进了沿着主要裂缝线的细长盆地的形成。版权所有（c）2007 John Wiley＆Sons，Ltd.

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