The long-term evolution of rivers draining westward from Brazilian Great escarpment remain unclear and one of the main questions is how western draining rivers organized and defined their modern courses. In this study, we evaluated how the Piraí Depression (PD) evolved and how rivers draining the PD interior defined their valleys and became an important contributing area for the Paraná River catchment. We used three sets of data: (1) topographical metrics (ks(n), knickpoints, local relief, χ-index values, Gilbert metrics, Swath Profiles and Seppômen Maps); (2) relief and river morphology (elbows and low-divides) from remote sensing derived data; and (3) sedimentologic analysis from a drainage capture previously identified with vibro-corer drilling. Ks(n), local relief and χ indices, and morphological evidence, point to an ongoing process of drainage rearrangement all over PD as it has been continuously eroded by Tibagi, Cinzas, Itararé and, mainly the Atlantic draining rivers from the Ribeira do Iguape River System. Morphometric, morphological and sedimentologic data imply long-lasting recurrence of captures and divide migration. The oldest capture evidence in the study area corresponds to the incision of the Iapó River which created the Guartelá Canyon. At least three generations of captures followed, and the younger generation is exemplified by the Maracanã-Jotuba capture as shown by the fieldwork data and described sedimentary facies. The field-documented underground capture illustrates the progressive abandonment and valley filling of the Maracanã River and capture by Jotuba river. Headward erosion and groundwater sapping are crucial for drainage (re)arrangements. In the PD drainage transition from endorheic to exorheic system was a direct result of captures. Atlantic rivers have greater erosion power and also migrate westward capturing areas from Paraná-La Plata which does not prevent drainage rearrangements to take place between westward-draining rivers.

从巴西大悬崖向西流淌的河流的长期演变仍不清楚，主要问题之一是西部流淌的河流如何组织和定义它们的现代河道。在这项研究中，我们评估了皮雷洼地 (PD) 如何演变，以及排干 PD 内部的河流如何定义它们的山谷并成为巴拉那河集水区的重要贡献区域。我们使用了三组数据：(1) 地形指标（ks(n )、knickpoints、局部地形、χ 指数值、Gilbert 指标、Swath Profiles 和 Seppômen Maps）；(2) 来自遥感数据的地形和河流形态（弯头和低洼地）；(3) 先前通过振动取芯钻孔确定的排水捕获的沉积学分析。Ks(n),局部地势和 χ 指数以及形态学证据表明整个 PD 正在进行排水重新排列的过程，因为它一直被 Tibagi、Cinzas、Itararé 以及主要是来自 Ribeira do Iguape 河系统的大西洋排水河流侵蚀。形态学、形态学和沉积学数据表明捕获的长期复发和分裂迁移。研究区域中最古老的捕获证据对应于创建瓜特拉峡谷的 Iapó 河的切口。随后至少进行了三代捕获，如实地调查所示，年轻一代以 Maracanã-Jotuba 捕获为例数据和描述的沉积相。现场记录的地下捕获说明了马拉卡纳河的逐渐废弃和山谷填充以及约图巴河的捕获。水头侵蚀和地下水流失对于排水（重新）布置至关重要。在 PD 排水系统中，从内流系统到外流系统的过渡是捕获的直接结果。大西洋河流具有更大的侵蚀能力，并且从巴拉那-拉普拉塔向西迁移捕获区域，这不会阻止向西排水的河流之间发生排水重新排列。