Abstract:This work presents a new MATLAB-based tool designed for network extraction and drainage network orderings by Horton and Hack hierarchies. Most GIS software offers only topological network orderings, based on joining segments, such as Stahler or Shreve, providing segments between junctions but not entire streams. Differently, Hack and Horton orderings allow organizing a drainage network in a hierarchy, identifying the parent segment over the child segment, giving as a result a drainage network where the value of a river remains unchanged from the mouth upstream to the headwater, allowing extracting entire streams. Horton and Hack hierarchies ease the interpretation of a drainage system compared to Strahler and Shreve. To extract the drainage network, this tool uses TopoToolbox 2 functions, to compute the prior steps of the channel network extraction and channel network ordering processes, and develops new functions. To sort a network, this tool allows selecting the parameter that defines the network hierarchy. This parameter is the socalled hierarchy attribute and could be the distance upstream, which refers to the distance between a junction upstream to the headwater, or the upstream accumulation, which is the accumulation at the junction. In addition to these mandatory parameters, the tool offers a set of optional parameters which turns it into a competitive alternative to generate a highly tailored ordered drainage network. The continuous channel network provided by the tool facilitates the use of other multiple applications for landscape analysis, such as the extraction longitudinal profiles or basin analysis through geomorphic indices.Key words: Hydrology, Fluvial hierarchies, Drainage network, Horton, Hack, MATLAB Resumen:Este trabajo presenta una nueva herramienta diseñada en MATLAB para la extracción y ordenación de redes de drenaje por las jerarquías de Horton y Hack. La mayoría de software GIS ofrece sólo ordenaciones topológicas de redes, basadas en la unión de segmentos, como las ordenaciones de Stahler o Shreve, que proveen segmentos entre puntos de confluencia pero no canales completos. En cambio, las ordenaciones de Hack y Horton permiten organizar una red de drenaje en una jerarquía, identificando el segmento primario sobre el segmento secundario, dando como resultado una red de drenaje donde el valor de un río permanece inalterado desde la desembocadura aguas arriba hasta la cabecera. Las ordenaciones de Horton y Hack facilitan la interpretación de un sistema de drenaje comparado con Strahler y Shreve. Para extraer la red de drenaje, esta herramienta utiliza funciones de TopoToolbox 2 para calcular los pasos previos de los procesos de extracción y ordenación de la red y además desarrolla nuevas funciones. Para ordenar la red, esta herramienta permite seleccionar el parámetro que define la jerarquía de la red. Este parámetro es el llamado atributo de jerarquía que puede ser la distancia aguas arriba, que se refiere a la distancia desde el punto de confluencia a la cabecera, o la acumulaci...
This work presents FLUNETS (FLUvial NETwork Sorting tool), a new MATLAB-based tool designed for channel network ordering by Horton and Hack hierarchies. Differently to Strahler and Shreve hierarchies, Hack and Horton orderings allow organizing a drainage network in a hierarchy, identifying the parent segment over the child segment, giving as a result a network where the value of a river remains unchanged from the mouth upstream to the headwater. The novelty of FLUNETS is that it allows the user to choose the hierarchy attribute. Therefore, a fluvial network can be ordered by distance to the mouth or by accumulation upstream. In addition, FLUNETS offers a wide set of optional parameters, which turns it into a friendly tool to attain a highly tailored ordered fluvial network. A continuous fluvial network is the starting point for multiple landscape analysis applications. The source code is available in the authors' GitHub account (https://github.com/geouned/FLUNETS).
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