<?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>2007-2422</journal-id>
<journal-title><![CDATA[Tecnología y ciencias del agua]]></journal-title>
<abbrev-journal-title><![CDATA[Tecnol. cienc. agua]]></abbrev-journal-title>
<issn>2007-2422</issn>
<publisher>
<publisher-name><![CDATA[Instituto Mexicano de Tecnología del Agua, Coordinación de Comunicación, Participación e Información]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-24222016000600159</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Composite Roughness in Hydraulic Models]]></article-title>
<article-title xml:lang="es"><![CDATA[Rugosidad compuesta en modelos hidráulicos]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Marengo-Mogollón]]></surname>
<given-names><![CDATA[Humberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aldama-Rodríguez]]></surname>
<given-names><![CDATA[Alvaro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Romero-Castro]]></surname>
<given-names><![CDATA[Ignacio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México (UNAM) Instituto de Ingeniería ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Consultor independiente  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="Af3">
<institution><![CDATA[,Comisión Federal de Electricidad  ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2016</year>
</pub-date>
<volume>7</volume>
<numero>6</numero>
<fpage>159</fpage>
<lpage>178</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-24222016000600159&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-24222016000600159&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-24222016000600159&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: An experimental survey study was carried out on hydraulic models in tunnels working as full pipe on composite roughness; the experimental analysis was made with different friction coefficients (that belong to different materials) and compared with values calculated from a proposed theoretical formulation. The model was made for the diversion work of El Cajón hydroelectric project, these criteria also was applied to the Grijalva Tunnels under operation in Mexico and they are also being used for La Yesca hydroelectric project presently under construction.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: En un aparato experimental se llevó a cabo un modelo en túneles hidráulicos trabajando a tubo lleno con rugosidad compuesta; el análisis experimental fue con distintos coeficientes de fricción (que pertenecen a distintos materiales). Se comparan con valores calculados a partir de formulaciones teóricas. El modelo se hizo para la obra de desvío del proyecto hidroeléctrico El Cajón, y se aplicó también para el diseño de los túneles de emergencia del Grijalva, ambos proyectos en operación en México.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Acrylic-plastic-carpet]]></kwd>
<kwd lng="en"><![CDATA[coefficient of resistance]]></kwd>
<kwd lng="en"><![CDATA[composite roughness]]></kwd>
<kwd lng="en"><![CDATA[hydraulic models]]></kwd>
<kwd lng="es"><![CDATA[acrílico-plástico]]></kwd>
<kwd lng="es"><![CDATA[coeficiente resistencia]]></kwd>
<kwd lng="es"><![CDATA[rugosidad compuesta]]></kwd>
<kwd lng="es"><![CDATA[modelos hidráulicos]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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