<?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>0188-4611</journal-id>
<journal-title><![CDATA[Investigaciones geográficas]]></journal-title>
<abbrev-journal-title><![CDATA[Invest. Geog]]></abbrev-journal-title>
<issn>0188-4611</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Geografía]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0188-46112016000300025</article-id>
<article-id pub-id-type="doi">10.14350/rig.47722</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Análisis cuantitativo del relieve en cuencas de drenaje de la vertiente norte del macizo &#8220;El Ávila&#8221; (estado Vargas, Venezuela) y su significado hidrogeomorfológico]]></article-title>
<article-title xml:lang="en"><![CDATA[Quantitative analysis of the relief in watersheds of the &#8220;El Ávila&#8221; massif northern hillside (Vargas State, Venezuela) and its hydrogeomorphological meaning]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Méndez Mata]]></surname>
<given-names><![CDATA[Williams José]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Pedagógica Experimental Libertador Instituto Pedagógico de Caracas Departamento de Ciencias de la Tierra]]></institution>
<addr-line><![CDATA[Caracas ]]></addr-line>
<country>Venezuela</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>
<numero>91</numero>
<fpage>25</fpage>
<lpage>42</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-46112016000300025&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-46112016000300025&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-46112016000300025&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Las características morfológicas del relieve y la cuantificación morfométrica de sus magnitudes son elementos esenciales para la interpretación de la influencia de este en la dinámica hidrogeomorfológica de cuencas de drenaje en ambientes montañosos. Por ello, es propósito fundamental de esta investigación analizar cuantitativamente los rasgos del relieve en cuencas de la vertiente norte del macizo &#8220;El Ávila&#8221; (estado Vargas, Venezuela) y su incidencia en el comportamiento hidrogeomorfológico de ellas. La metodología consistió en la caracterización geomorfológica del área; mediciones y cálculos de parámetros morfométricos del relieve; análisis estadístico descriptivo de estos parámetros; análisis de correlación lineal entre ellos y análisis de sus componentes principales. Las cuencas estudiadas categorizan como microcuencas de carácter exorreico, en las que se distinguen un área de recepción, un canal de desagüe principal y abanicos aluviales. Los ríos y quebradas principales de los sistemas son de cortos recorridos, con fuertes cambios en sus gradientes topográficos. En general, se observan muy bajas correlaciones entre los parámetros morfométricos del relieve. Los parámetros morfométricos con mayor peso sobre la dinámica hidrogeomorfológica de las cuencas están representados por: pendiente media del relieve, altitud máxima, relieve máximo, concavidad del perfil longitudinal de la corriente principal y altitud de la naciente.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: The morphological features of the relief and its quantitative morphometric quantification are essential elements in interpreting its influence on the hydrogeomorphological dynamics of watersheds in mountainous environments. This is particularly important when studying small spatial units (micro watersheds) and torrential regimes, as this influences the sudden and aggressive hydrological responses of these systems and the likelihood of activation of mass removal processes. In the study region (Vargas State, Venezuela) the most important debris flow recorded in Venezuela's history occurred on December 14, 15 and 16, 1999, as a consequence of extremely heavy rainfall in those dates associated with a very particular weather. For the above reasons, this research conducted a quantitative analysis of the relief features in watersheds of &#8220;El Ávila&#8221; massive northern hillside and their impact on the local hydrogeomorphological dynamics, aimed at identifying the main attributes influencing these dynamics. The study area is located in the northern-central region of Venezuela, in the central part of Vargas state, delimited by 10°32&#8217;25&#8221;-10°37&#8217;35&#8221;N and 66°40&#8217;08&#8221;- 66°59&#8217;12&#8221;W, and comprises thirteen micro watersheds of mountainous environment. The methodology consisted of (a) the geomorphological characterization of the area, from the review and interpretation of digitized base maps at scales 1:5 000 and 1:25 000, the digital elevation model (DEM), aerial photographs at scale 1:5 000, orthophotomaps at scale 1:25 000, satellite images, Google Earth and Google Maps images, and geomorphological maps (landforms and geomorphological processes) at scale 1:25 000; (b) measurements and calculations of basic morphometric parameters of watershed relief on digital mapping using the ArcGIS 9.2 and their Spatial Analysis and ArcHydro modules, and the mathematical equations that define the other parameters using MS Excel; (c) descriptive statistical analysis (DSA) of morphometric parameters in Excel spreadsheets, based on the following statistics: maximum value, minimum value, mean, mode, median, variance, standard deviation, skewness, kurtosis, coefficient of variation, first quartile, second quartile and third quartile; (d) linear correlation analysis (LCA) between morphometric parameters, based on the application and estimation of the Pearson product-moment correlation using the MS Excel XLSTAT add-on software; and (e) principal component analysis (PCA) of morphometric parameters based on correlations, run with SPSS Statistics v. 17.0. The results show that the watersheds in the study area are conceived as exorheic hydrogeomorphological systems. Three relief units characteristic of these mountain environments systems were distinguished: catchment area, main drain channel and cone or alluvial fan, each with its own morphological features (landforms) and distinctive geomorphological processes. Landforms were grouped into two major groups: on the one hand, those that result from the depositional activity of the main creeks and rivers, prevailing in valleys of the main drain channels and in foothills (alluvial fans); on the other, those that have been shaped by the erosive action associated with drainage networks, being observed mainly on hillsides. Creeks and rivers are waterways running along very short distances from headwaters to outputs on the mountain front, exhibiting pronounced changes in slope, usually steep. These are typical of torrential systems in mountainous environments with abrupt relief, favoring sudden hydrological responses. As regards the morphometric parameters of watershed relief and drainage networks, these were defined as topographically very rugged areas with steep slopes and steep altitudinal slopes. These morphometric parameters are typically represented by the slopes along the longitudinal profiles of the main creeks and rivers, and by the pronounced mountainous relief (massivity coefficient, orographic coefficient and Melton's ruggedness number). The LCA between morphometric parameters of relief revealed a few cases with good-to-high correlation, mainly due to the mathematical and geometric relationships between them. The PCA allowed reducing the number of morphometric parameters of relief, defining as new variables to the four created components. The main relief components in the first PCA axis were mean slope, maximum altitude, maximum relief, mainstream longitudinal profile concavity and headwater altitude, identified as those that exert the greatest influence on the hydrogeomorphological dynamics of the watersheds studied.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[análisis cuantitativo]]></kwd>
<kwd lng="es"><![CDATA[relieve]]></kwd>
<kwd lng="es"><![CDATA[cuenca de drenaje]]></kwd>
<kwd lng="es"><![CDATA[hidrogeomorfología]]></kwd>
<kwd lng="es"><![CDATA[estado Vargas]]></kwd>
<kwd lng="es"><![CDATA[Venezuela]]></kwd>
<kwd lng="en"><![CDATA[Quantitative analysis]]></kwd>
<kwd lng="en"><![CDATA[relief]]></kwd>
<kwd lng="en"><![CDATA[watershed]]></kwd>
<kwd lng="en"><![CDATA[hydrogeomorphology]]></kwd>
<kwd lng="en"><![CDATA[Vargas State]]></kwd>
<kwd lng="en"><![CDATA[Venezuela]]></kwd>
</kwd-group>
</article-meta>
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