Salt lake deformation detected from space
Salt lake deformation detected from space
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DOI：
10.1016/j.epsl.2012.03.009
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发表时间：
2012-05
影响因子：
5.3
通讯作者：
J. Ruch;J. Warren;F. Risacher;T. Walter;R. Lanari
中科院分区：
文献类型：
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作者：
J. Ruch;J. Warren;F. Risacher;T. Walter;R. Lanari
为了研究智利阿塔卡马沙漠（南纬24-26°）撒拉流的时空演化，我们利用卫星雷达干涉测量技术反演了2003年至2008年期间的变形时间序列。我们发现，所有被调查的12个撒拉流都在积极变形，在卫星视线方向上的位移率为-1.4至1.5厘米/年。位移率主要局限于撒拉族本身，并且在时间和空间上通常是恒定的。为了了解这种位移信号的原因，我们进一步将这些观测结果与 LANDSAT 图像和现场观测结果进行比较。这些观测结果之间的关系表明，最快速的隆起区域表明地下物质的增生。与盐湖水文有关的各种盐沉积过程可以解释这种增生，最有可能的是地表盐壳内部和之下的毛细管岩盐沉淀。我们进一步提出，撒拉族的动态取决于盐水的存在和复苏的咸水地下水，可以用作安第斯山脉中部以及地球其他地方类似的水资源有限地区水资源演变的潜在指标。
To investigate the spatiotemporal evolution of salars in the Atacama Desert in Chile (24–26°S), we use a deformation time series retrieved by applying satellite radar interferometry techniques for the period from 2003 to 2008. We find that all 12 salars surveyed are actively deforming, with displacement rates from −1.4 to 1.5cm/yr in the satellite line-of-sight direction. Displacement rates are mostly confined to the salars themselves, and are generally constant in time and space. To understand the reason for this displacement signal, we further compare these observations with LANDSAT imagery and field observations. Relationships between these observations suggest that the most rapid uplift regions indicate subsurface material accretion. A variety of saline sedimentary processes related to the salar hydrology can explain this accretion, the most likely being capillary halite precipitation within and below surficial salt crusts. We further propose that salars, whose dynamics are dependent on the presence of brine and resurging saline groundwater, may be used as potential indicators of water resource evolution in the central Andes, and in similar water-limited regions elsewhere on earth.