<?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>2215-3470</journal-id>
<journal-title><![CDATA[Uniciencia]]></journal-title>
<abbrev-journal-title><![CDATA[Uniciencia]]></abbrev-journal-title>
<issn>2215-3470</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional, Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2215-34702021000100071</article-id>
<article-id pub-id-type="doi">10.15359/ru.35-1.5</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Acercamiento a los procesos de modelación de la calidad del agua en una subcuenca. Caso del río Virilla, Costa Rica]]></article-title>
<article-title xml:lang="en"><![CDATA[Approaching to water quality modeling processes in a subwatershed. The Virilla River case in Costa Rica]]></article-title>
<article-title xml:lang="pt"><![CDATA[Abordagem dos processos de modelação da qualidade da água em uma sub-bacia. Caso do rio Virilla, Costa Rica]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez-Gutiérrez]]></surname>
<given-names><![CDATA[Rolando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gómez-Castro]]></surname>
<given-names><![CDATA[Cinthya]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Laboratorio de Manejo del Recurso Hídrico ]]></institution>
<addr-line><![CDATA[ Heredia]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,cgomez@esph-sa.com  ]]></institution>
<addr-line><![CDATA[ Heredia]]></addr-line>
<country>Costa Rica</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2021</year>
</pub-date>
<volume>35</volume>
<numero>1</numero>
<fpage>71</fpage>
<lpage>89</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S2215-34702021000100071&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S2215-34702021000100071&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S2215-34702021000100071&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Se realizó la implementación de un modelo de calidad del agua superficial, a través del cual se procuraba hacer un primer acercamiento a los procesos de modelado matemático como insumo para la gestión integrada de la cuenca media del río Virilla. El estudio se desarrolló específicamente en un tramo de 20 km que inicia en San Miguel de Santo Domingo y finaliza en San Antonio de Belén, se tiene como principal afluente el río Tibás y la inclusión de algunas descargas de aguas residuales provenientes de diversas actividades productivas. El enfoque que se utilizó fue cuantitativo, mediante el modelo MOHID Land con la aplicación de datos experimentales e históricos de las variables necesarias para el modelado. El modelo implementado es un programa numérico capaz de simular la dinámica existente entre agua-suelo y los procesos de transporte de solutos; en este caso, se eligió modelar la concentración de dos indicadores de calidad: el oxígeno disuelto y la demanda bioquímica de oxígeno. Los resultados obtenidos en la modelación presentaron un buen ajuste en contraste con los datos utilizados para la validación del modelo, los porcentajes de error obtenidos son calificados como muy buenos, buenos y satisfactorios, lo que en general se puede describir como un modelo aplicable. A pesar de esto, es necesario el desarrollo de una calibración más robusta que a su vez se acompañe de un análisis de sensibilidad. Es importante que en el nivel país exista una mayor diseminación del uso de esta herramienta para la gestión integrada del recurso hídrico, este estudio sirve como base para la futura modelación de otros parámetros fisicoquímicos del cuerpo de agua, así como la aplicación del mismo en otros ríos similares.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract A surface water quality model was implemented as a first approach to mathematical modeling processes as an input for the integrated management of the middle basin of the Virilla River. The study was conducted in a 20 km-section covering from San Miguel de Santo Domingo to San Antonio de Belén, which is fed by the Tibás River as the main tributary and some discharges of wastewater resulting from various productive activities. The study used a quantitative approach and a MOHID Land model, as well as experimental and historical data of the variables needed for modeling. The model implemented is a numerical program that simulates the dynamics between water-soil and solute transport processes. For purposes of this study, two quality indicators, dissolved oxygen and biochemical oxygen demand, was the concentration modeled. The results obtained in the modeling presented a good adjustment in contrast to the data used for model validation; the error percentages obtained are rated as very good, good, and satisfactory, which can generally be described as an applicable model. Despite this, a more robust calibration needs to be developed along with a sensitivity analysis. There should be a greater dissemination of the use of this tool for the integrated management of water resources in the country. This study serves as a basis for the future modeling of other physicochemical parameters of water bodies, as well as its application in other similar rivers.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo Foi realizada a implementação de um modelo de qualidade das águas superficiais, por meio do qual se buscava fazer uma abordagem inicial nos processos de modelação matemática como insumo para a gestão integrada da bacia média do rio Virilla. O estudo foi realizado especificamente em uma seção de 20 km que começa em San Miguel de Santo Domingo e termina em San Antonio de Belén, cujo principal afluente é o rio Tibás e a inclusão de algumas descargas de efluentes provenientes de várias atividades produtivas. A abordagem utilizada foi quantitativa, utilizando o modelo MOHID Land com a aplicação de dados experimentais e históricos das variáveis &#8203;&#8203;necessárias para a modelação. O modelo implementado é um programa numérico, capaz de simular a dinâmica existente entre água-solo e os processos de transporte de solutos; nesse caso, optou-se por modelar a concentração de dois indicadores de qualidade: o oxigênio dissolvido e a demanda bioquímica de oxigênio. Os resultados obtidos na modelação apresentaram um bom ajuste em contraste com os dados utilizados para a validação do modelo, e as porcentagens de erro obtidas são classificadas como muito boas, boas e satisfatórias, que, de modo geral, podem ser descritas como um modelo aplicável. Apesar disso, é necessário desenvolver uma calibração mais robusta acompanhada de uma análise de sensibilidade. É importante, em nível nacional, haver uma maior disseminação do uso dessa ferramenta para a gestão integrada dos recursos hídricos, e que este estudo sirva de base para a futura modelação de outros parâmetros físico-químicos do corpo d'água, bem como sua aplicação em outros rios semelhantes.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Agua superficial]]></kwd>
<kwd lng="es"><![CDATA[calidad del agua]]></kwd>
<kwd lng="es"><![CDATA[modelación]]></kwd>
<kwd lng="es"><![CDATA[MOHID Land]]></kwd>
<kwd lng="es"><![CDATA[río Virilla]]></kwd>
<kwd lng="en"><![CDATA[Surface water]]></kwd>
<kwd lng="en"><![CDATA[water quality]]></kwd>
<kwd lng="en"><![CDATA[modeling]]></kwd>
<kwd lng="en"><![CDATA[MOHID Land]]></kwd>
<kwd lng="en"><![CDATA[Virilla River]]></kwd>
<kwd lng="pt"><![CDATA[Água superficial]]></kwd>
<kwd lng="pt"><![CDATA[qualidade da água]]></kwd>
<kwd lng="pt"><![CDATA[modelação]]></kwd>
<kwd lng="pt"><![CDATA[MOHID Land]]></kwd>
<kwd lng="pt"><![CDATA[rio Virilla]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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