Sedimentological connectivity is associated with the degree of linkage between sediment sources and downslope areas. In this study, a connectivity index is proposed to estimate the contribution of different parts of a basin as sources of sediments and to assess the pathway of sediment flux. A small granitic basin located on the eastern slope of the Comechingones Ranges (Córdoba Province, Argentina), was selected as a case study. The semi-quantitative connectivity index is defined by the equation CI = T + Dd + C–B, in which T is the variable toposequences that represents the types of storage and lateral links; Dd is the drainage density and it is used to evaluate the longitudinal links; C corresponds to the number of connections between channels of different order in a basin and it complements Dd in the longitudinal links analysis; and B connotes barriers associated with the number and type of disconnections in the drainage network, thus its sign is negative. From cartographic and field data, a detailed lithological–geomorphological survey was carried out; storage and toposequence types were described, and the barriers were classified according to the type, size, and position in the basin. The CI was determined for each secondary and main sub-basin of the Arenoso stream. Therefore, five connectivity classes were defined from the CI values obtained. This methodology allows arising acceptable results in research associated with the spatial heterogeneity of basin connectivity. The CI developed, in this first approach, showed satisfactory results and is applicable to analysis of small mountain basins, being based mainly on geological–geomorphological–hydrographic maps coupled with detailed fieldwork.

沉积学上的连通性与沉积物来源和下坡地区之间的联系程度有关。在这项研究中，提出了连通性指数以估计盆地不同部分作为沉积物来源的贡献并评估沉积物通量的路径。作为案例研究，选择了一个位于Comechones Ranges东坡（阿根廷科尔多瓦省）的小型花岗岩盆地。半定量连通性指数由方程CI  =  T  +  Dd  +  C–B定义，其中T是表示存储和侧链类型的后继变量。Dd是排水密度，用于评估纵向连接；C对应于盆地中不同阶的通道之间的连接数，它在纵向链接分析中是Dd的补充；和乙蕴含与排水网络中断开的数量和类型相关联的障碍，因而其符号为负。根据制图和现场数据，进行了详细的岩性-地貌调查。描述了储层和后序类型，并根据盆地的类型，大小和位置对障碍进行了分类。确定了Arenoso流的每个次要和主要子流域的CI。因此，从配置项定义了五个连接类别获得的值。这种方法可以使与盆地连通性空间异质性相关的研究产生可接受的结果。在第一种方法中开发的配置项显示出令人满意的结果，并且适用于小型山区盆地的分析，主要基于地质－地貌－水文地图以及详细的实地考察。