ABSTRACT

This paper presents the geomorphological mapping at a 1:100,000 scale of fluvial deposits in the middle Tocantins River. The region preserves an important sedimentary archive of environmental changes of the Amazon and Cerrado biomes. Yet, the region is under influence of diverse anthropogenic activities, including planned or operational hydropower plants, and detailed geomorphological mapping is lacking. The mapping combined interpretation of surface geomorphic features, morphometric analysis, and field surveys. Three main geomorphic units were defined: (i) fluvial plain, (ii) fluvial terraces, and (iii) paleo-alluvial fans. The detailed mapping survey allowed a hierarchical organization of geomorphological units as well as their relative chronology of formation. Our results improve the understanding on the complex geomorphological processes which shape the current fluvial landscape. Specifically, improving the understanding of the Tocantins River floodplains is crucial to support conservation of flooded forests, sustainable use of natural resources and minimize socio-economic losses and damages.

摘要

本文介绍了托坎汀斯河中段河流沉积物的比例为1：100,000的地貌图。该地区保存着关于亚马逊和塞拉多生物群落环境变化的重要沉积档案。然而，该地区受到各种人类活动的影响，包括计划中的或运营中的水力发电厂，并且缺乏详细的地貌图。该映射结合了表面地貌特征的解释，形态分析和野外勘测。定义了三个主要的地貌单元：（i）河床平原，（ii）河床阶地和（iii）古冲积扇。详细的制图调查可以对地貌单位及其形成的相对年代进行分层组织。我们的结果提高了对影响当前河流景观的复杂地貌过程的理解。具体而言，增进对托坎丁斯河漫滩的了解对于支持水淹森林的保护，自然资源的可持续利用以及将社会经济损失和损害降至最低至关重要。