Abstract The drainage network of the Brazilian semi-arid responds directly to the complexity of the geomorphic background and surface processes. In this regional context, the Araripe Plateau, a table-like landform that reaches up of 950 m in elevation, stands out as a peculiar physiographic setting. The present work proposes an analysis of the Plateau's fluvial system based on channel morphology descriptive criteria, in relation to their morphostratigraphic scenarios. The research sought to explore river typologies, dominant surface processes and geomorphic changes in the drainage system throughout the Holocene. Seven fluvial styles have been identified in the Salamanca River watershed, expressing lithological controls of the underlying sedimentary rocks, morphotectonic influence, variability in rainfall input, as well as changes in land use. Headwaters' channels cut through the sandstone of the structural summit surface and the unconsolidated sedimentary infills of topographic hollows along the escarpment base. On the hillslopes, downstream of the escarpment, the incised meandering river style with occasional pocket plains attest to shifts in patterns of fluvial dissection due to changes in base level. In the peripheral depression (Vale do Cariri), at an average elevation of 400 m, the arroyo and floodout river styles prevail, displaying a sequence of incised and non-incised river stretches, reflecting the operation of recent cut-and-fill processes mostly controlled by the interannual rainfall variability. Cut-and-fill processes operating within the channels have prevailed all through the Holocene, as suggested by morphostratigraphical evidence, alternating overall valley bottom filling episodes with river entrenching periods (paleo-connectivity). Base level change during the upper Holocene did not result in comprehensive sediment delivery to the channel networks, as attested by remaining discontinuous pocket plains and fluvial terraces.

中文翻译：

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萨拉曼卡流域的景观演变，阿拉里佩高原：河道形态分类的见解

摘要 巴西半干旱地区的排水网络直接响应地貌背景和地表过程的复杂性。在这种区域背景下，阿拉里佩高原是一种海拔高达 950 m 的桌状地貌，具有独特的自然地理环境。目前的工作提出了基于通道形态描述标准的高原河流系统分析，与它们的形态地层情景有关。该研究旨在探索整个全新世的河流类型、主要地表过程和排水系统的地貌变化。在萨拉曼卡河流域中已经确定了七种河流样式，表达了下伏沉积岩的岩性控制、形态构造影响、降雨输入的变化以及土地利用的变化。源头水道穿过构造峰顶表面的砂岩和沿着悬崖底部的地形凹陷的松散沉积填充物。在悬崖下游的山坡上，切割蜿蜒的河流风格和偶尔出现的口袋平原证明了由于基线水平的变化，河流解剖模式发生了变化。在外围洼地 (Vale do Cariri)，平均海拔 400 m 处，阿罗约河型和泛滥河型占主导地位，呈现出下切和非下切河段的序列，主要反映了最近的挖填过程的操作受年际降雨变化的控制。正如形态地层学证据所表明的那样，在整个全新世期间，河道内的挖填过程一直盛行，交替的整体谷底充填期与河道巩固期（古连通性）。全新世上部的基线变化并未导致全面的沉积物输送到河道网络，剩余不连续的口袋平原和河流阶地证明了这一点。