全新世气候变化对河流地貌响应的遥感评价

Giulia Iacobucci
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引用次数: 0

摘要

在全新世,底格里斯河-幼发拉底河水系(下美索不达米亚平原)受气候波动、海岸线移动和人类活动的影响,呈现出复杂的形态动力学特征。在海拔较低的宽阔贫瘠河漫滩上,遥感多传感器方法适合于识别主要地貌特征和相关地貌过程。采用光学和多光谱图像(TerraColor和Landsat 8)进行初步目视检查和多光谱指数(NDVI和Clay Ratio)的计算,并进行监督分类。对微地形进行综合地形分析,对两个dem (AW30D30和GDEM2)进行重新分类,以突出排水系统的特殊配置,该排水系统的河道高于周围洪泛平原几米。这种方法可以通过大中型尺度对研究区域进行调查,识别活动和废弃的河道,区分活动和废弃的崩解过程,区分裂缝河道、堤防和沉积物。以类似的方式,人类特征被识别,允许评估人与环境的相互作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Remote sensing applications for the assessment of the geomorphic response of fluvial systems to the Holocene Climate Changes
During the Holocene, the Tigris-Euphrates river system (Lower Mesopotamian Plain) was characterized by a complex morphodynamic due to climatic fluctuations, shoreline shifting, and human activities. Within a wide and barren floodplain with low elevation ranges, a remote sensing multi-sensor approach is suitable to identify the main geomorphological features and associated geomorphic processes. Optical and multispectral imagery (TerraColor and Landsat 8) are adopted for the preliminary visual inspection and the computation of multispectral indices (NDVI and Clay Ratio), as well as for the supervised classification. The topographic analysis of the micro-relief is integrated reclassifying two DEMs (AW30D30 and GDEM2) to highlight the peculiar configuration of the drainage system, which channels are several meters above the surrounding floodplain. This approach allows the investigation of the study area through large and medium scale, identifying active and abandoned channels, discerning between active and abandoned avulsion processes and distinguishing crevasse channels, levees, and deposits. In like manner, human features are recognized, allowing the evaluation of human-environmental interactions.
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