<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0370-3908</journal-id>
<journal-title><![CDATA[Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. acad. colomb. cienc. exact. fis. nat.]]></abbrev-journal-title>
<issn>0370-3908</issn>
<publisher>
<publisher-name><![CDATA[Academia Colombiana de Ciencias Exactas, Físicas y Naturales]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0370-39082018000400379</article-id>
<article-id pub-id-type="doi">10.18257/raccefyn.641</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Cuatro modelos de redes de drenaje]]></article-title>
<article-title xml:lang="en"><![CDATA[Four Models of Channel Networks]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mesa]]></surname>
<given-names><![CDATA[Oscar José]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional de Colombia Departamento de Geociencias y Medio Ambiente ]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2018</year>
</pub-date>
<volume>42</volume>
<numero>165</numero>
<fpage>379</fpage>
<lpage>391</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0370-39082018000400379&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0370-39082018000400379&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0370-39082018000400379&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Se revisan cuatro modelos cuantitativos de redes de drenaje. La característica principal de la redes es la autosemejanza. Pero las redes no son determinísticas y es necesario tener en cuenta la variabilidad. El primer modelo es simple, incorpora la variabilidad y es falsificable. Sin embargo, no reproduce las observaciones porque la consideración de la autosemejanza no es explícita. El segundo modelo corrige esta falencia, pero es determinista y no es falsificable. El tercer modelo mantiene la autosemejanza, incorpora la variabilidad, pero no se ha puesto a prueba. El cuarto modelo define un marco teórico más riguroso, aunque su verificación empírica aún está pendiente. Se concluye con un corto análisis de las implicaciones de los modelos para la geometría hidráulica y la semejanza hidrológica.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract We review four quantitative models of drainage networks. The main characteristic of channel networks is self- similarity. But networks are not deterministic, there is natural variability that needs to be taken into account. The first model is simple, it takes into account variability and can be tested. Nevertheless, it does not reproduce observations adequately because self-similarity is not explicitly considered in the model construction. The second model does consider self-similarity in the construction but it does not take into account variability and it cannot be tested. The third model considers both self-similarity and variability. The fourth model defines a firmer theoretical basis but it also needs testing against observations. We conclude stressing the need for a thorough test of the model against observations and analysing implications for hydraulic geometry and hydrologyc similarity.]]></p></abstract>
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<kwd lng="es"><![CDATA[Geomorfología]]></kwd>
<kwd lng="es"><![CDATA[Redes de drenaje]]></kwd>
<kwd lng="es"><![CDATA[Hidrología]]></kwd>
<kwd lng="es"><![CDATA[Auto-semejanza.]]></kwd>
<kwd lng="en"><![CDATA[Geomorphology]]></kwd>
<kwd lng="en"><![CDATA[drainage networks]]></kwd>
<kwd lng="en"><![CDATA[hydrology]]></kwd>
<kwd lng="en"><![CDATA[self-similarity]]></kwd>
</kwd-group>
</article-meta>
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