<?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>S2007-24222021000600455</article-id>
<article-id pub-id-type="doi">10.24850/j-tyca-2021-06-11</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Contraste del EDI (Effective Drought Index) mensual como método simple para el monitoreo de sequías meteorológicas]]></article-title>
<article-title xml:lang="en"><![CDATA[The contrast of the monthly EDI (Effective Drought Index) as a simple method for monitoring meteorological droughts]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Campos-Aranda]]></surname>
<given-names><![CDATA[Daniel Francisco]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma de San Luis Potosí  ]]></institution>
<addr-line><![CDATA[ San Luis Potosí]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2021</year>
</pub-date>
<volume>12</volume>
<numero>6</numero>
<fpage>455</fpage>
<lpage>479</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-24222021000600455&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-24222021000600455&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-24222021000600455&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Los índices de sequías se utilizan para detectar y dar seguimiento a las condiciones de sequía de una zona o región. Diversos índices de sequías han sido propuestos desde mediados de la década de 1970, algunos de ellos fueron desarrollados para una región o clima específicos y, por ello, los estudios de comparación de varios índices de sequía bajo climas diferentes son siempre útiles y se genera confianza en tales índices cuando sus resultados son semejantes. En este estudio se describe con detalle el procedimiento operativo del EDI (Effective Drought Index), aplicado a datos de precipitación mensual. El EDI fue expuesto originalmente por Byun y Wilhite (1999) para procesar lluvias diarias, pero debido a la dificultad que existe para disponer de tales registros, se desarrolló su versión mensual. Los tres contrastes del EDI descritos en este estudio se realizan para una duración de sequía de 12 meses: 1) con el SPI (Standardized Precipitation Index) de la estación climatológica Río Verde, en San Luis Potosí, México; 2) con el SPEI (Standardized Precipitation-Evapotranspiration Index) de la estación climatológica Zacatecas, Zacatecas, México, y 3) con el SPDI (Standardized Palmer Drought Index) de la estación climatológica Xilitla, San Luis Potosí, México. Las gráficas de evolución de cada índice contrastado mostraron una gran similitud con las gráficas únicas del EDI; pero estas últimas definen un mayor detalle respecto a los cambios de la precipitación mensual. Con base en el análisis de los resultados, se recomienda la aplicación sistemática del EDI mensual en el monitoreo de sequías meteorológicas y en los estudios de comparación de índices debido a que tiene un procedimiento operativo bastante simple, y a que no requiere la definición de la duración de la sequía, lo cual conduce a un único cálculo de tal índice.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Drought indices are used to detect and monitor the drought conditions of an area or region. Various drought indices have been proposed since the mid-sixties, some of them were developed for a specific region or climate and therefore, comparison studies of various drought indices under different climates are always useful and build confidence in such indices, when their results are similar. This study describes in detail the operating procedure of the EDI (Effective Drought Index), applied to monthly precipitation data. The EDI was originally exposed by Byun and Wilhite (1999) to process daily rains, but due to the difficulty of having such records, its monthly version was developed. The three EDI contrasts described in this study are carried out for a drought duration of 12 months: 1) with the SPI (Standardized Precipitation Index) of the climatological station Río Verde, San Luis Potosí, Mexico; 2) with the SPEI (Standardized Precipitation-Evapotranspiration Index) of the climatological station Zacatecas, Zacatecas, Mexico, and 3) with the SPDI (Standardized Palmer Drought Index) of the climatological station Xilitla, San Luis Potosí, Mexico. The evolution graphs of each contrasted index showed great similarity with the unique EDI graphs, but the latter define in more detail the changes of monthly precipitation. Based on the analysis of the results, the systematic application of the monthly EDI, in the monitoring of meteorological droughts and the comparison studies of indexes, is recommended because it has a simple operating procedure, it does not require the definition of the duration of drought, and it is derived from a one-step calculation.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[sequías meteorológicas]]></kwd>
<kwd lng="es"><![CDATA[Índice Efectivo de Sequías (EDI)]]></kwd>
<kwd lng="es"><![CDATA[SPI]]></kwd>
<kwd lng="es"><![CDATA[SPEI]]></kwd>
<kwd lng="es"><![CDATA[SPDI]]></kwd>
<kwd lng="es"><![CDATA[gráficas de evolución de las sequías]]></kwd>
<kwd lng="en"><![CDATA[Meteorological droughts]]></kwd>
<kwd lng="en"><![CDATA[Effective Drought Index (EDI)]]></kwd>
<kwd lng="en"><![CDATA[SPI]]></kwd>
<kwd lng="en"><![CDATA[SPEI]]></kwd>
<kwd lng="en"><![CDATA[SPDI]]></kwd>
<kwd lng="en"><![CDATA[drought evolution graphs]]></kwd>
</kwd-group>
</article-meta>
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