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首页> 外文期刊>Limnology >A photographic method for detailing the morphology of the floor of a dynamic crater lake: the El Chichón case (Chiapas, Mexico)
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A photographic method for detailing the morphology of the floor of a dynamic crater lake: the El Chichón case (Chiapas, Mexico)

机译：用摄影方法详细描述动态火山口湖底的形态：ElChichón箱（墨西哥恰帕斯州）

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摘要

The active volcano El Chichón (Chiapas, Mexico) hosts a shallow acidic crater lake. During the period 2001–2007, 26 photographs of the crater lake were taken from the same spot at the eastern crater rim, ~160 m above the crater floor. The size of the lake was extremely variable. Using a GPS track from around the lake shore as a reference, 26 digitized lake outlines were corrected simultaneously for the perspective angle. The corrected lake outlines were superposed, leading to a “morphological map” of a large section of the lake bottom. This map provides insight into the erosive–sedimentary regime of the lake floor. The inner section of the lake is more stable due to the precipitation of sealing clays. This is probably one of the reasons why the El Chichón crater lake has never disappeared during the past 28 years. The sealing clays at the lake bottom can be considered the superficial analog of impermeable clay caps at the depths of hydrothermal systems. The photographic procedure presented here may be useful for other limnological and (volcanic) lake studies aimed at describing lake morphology, and for eventually deducing the surface area and volume of the lake.
机译：活跃的火山ElChichón（墨西哥恰帕斯）拥有一个浅酸性的火山口湖。在2001年至2007年期间，从火山口边缘上方约160 m的东部火山口边缘的同一地点拍摄了26张火山口湖的照片。湖的大小变化很大。以湖岸周围的GPS轨迹为参考，同时对26个数字化的湖面轮廓进行了视角校正。校正后的湖面轮廓被叠加，从而形成了湖底大部分区域的“形态图”。该地图提供了对湖床侵蚀性沉积沉积的了解。由于密封粘土的沉淀，湖的内部更加稳定。这可能是ElChichón火山口湖在过去28年从未消失的原因之一。湖底的密封黏土可以认为是热液系统深度的不透水黏土盖的表面模拟。此处介绍的照相程序可能对其他旨在描述湖泊形态的湖泊学和（火山）湖泊研究有用，并最终推断出湖泊的表面积和体积。

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