Determination of channels heads from digital surface models. upper basin of La Ventana stream (Buenos Aires, Argentina)
When defining the hydrographic network of a basin, it is important to precisely locate the beginnings of the channels, since this position influences different aspects of the dynamics of a basin. Currently, the evolution of Geographic Information Systems (GIS) and the existence of Digital Surface Models (DSM) make it possible to extract drainage networks automatically, however, on many occasions, these results require verification in field or in different sources of information to validate and achieve greater precision. Therefore, the objective of this work is to determine and evaluate the optimum location threshold of the channels heads location of upper basin of La Ventana stream (Buenos Aires, Argentina) through the use of a DSM. To evaluate the suitability of the automatic models obtained, the results were compared with high-resolution satellite images and field control. In turn, morphometric indices were used to determine the variations in the hydrological response of each model. The main results indicate variations both in the length and in the number of sections according to the threshold that affect the results of each index. Is highlighted the importance of choosing an optimal threshold to obtain the drainage network model that is most consistent with reality from which valid and specific data can be extracted.
How to Cite
©The authors of the articles and other contributions published in GeoFocus keep intact the intellectual property rights over them. The authors and the publisher authorize the total or partial reproduction of the contents of the journal in the following terms:
1) Express mention of the author and the reference of the original publication.
2) Do not perform a commercial or lucrative use of them. Otherwise, you should contact the authors to make the appropriate arrangements.
3) Authors preserve their property rights and give to the journal the rights of the first publication of the work, registered with the Licencia Creative Commons Atribución-NoComercial-SinDerivar 4.0 Internacional, which allows third parties to use the published data whenever the authorship of the work and first publication in this journal is mentioned.
4) It is allowed that authors disseminate electronically (e.g., in institutional repositories or on their own website) the published version of their work, as it encourages the earliest circulation and dissemination, and thus a possible increase in the citation and scope in the academic community.