<?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>0871-018X</journal-id>
<journal-title><![CDATA[Revista de Ciências Agrárias]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. de Ciências Agrárias]]></abbrev-journal-title>
<issn>0871-018X</issn>
<publisher>
<publisher-name><![CDATA[Sociedade de Ciências Agrárias de Portugal]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0871-018X2008000100004</article-id>
<title-group>
<article-title xml:lang="pt"><![CDATA[Equação de green-ampt para a infiltração da água no solo aproximações numéricas para explicitação do volume infiltrado]]></article-title>
<article-title xml:lang="en"><![CDATA[Green-ampt equation for water infiltration into soil numerical approximations to the explicit formulation for the accumulated water]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mello]]></surname>
<given-names><![CDATA[Francisco Mercês de]]></given-names>
</name>
</contrib>
</contrib-group>
<aff id="A">
<institution><![CDATA[,  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>01</month>
<year>2008</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>01</month>
<year>2008</year>
</pub-date>
<volume>31</volume>
<numero>1</numero>
<fpage>31</fpage>
<lpage>35</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_arttext&amp;pid=S0871-018X2008000100004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_abstract&amp;pid=S0871-018X2008000100004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_pdf&amp;pid=S0871-018X2008000100004&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="pt"><p><![CDATA[O modelo de infiltração de Green-Ampt (1911), muito utilizado ainda hoje em Hidrologia, não permite explicitar de forma exacta o volume acumulado por infiltração em função do tempo. É neste contexto que se insere o presente estudo ,no qual são propostas duas soluções aproximadas. A primeira equação é original e a segunda resulta de modificações introduzidas numa das equações de Li et al. (1976). Analisaram-se os erros relativos provenientes da aplicação destas equações e apresenta-se um exemplo para melhor concretizar a aplicação destas aproximações numéricas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[The Green-Ampt infiltration model (1911), still used in Hydrology nowadays, does not allows to have an exact explicitation of the accumulated infiltration water versus time. The present work tries to solve this problem by presenting two solutions. The first equation is original and the second is the result of some improvements made in one of Li et al equations (1976).The relative errors proceeding from these equation were discussed and one example is presented in order to concretize these numerical applications.]]></p></abstract>
<kwd-group>
<kwd lng="pt"><![CDATA[infiltração]]></kwd>
<kwd lng="pt"><![CDATA[optimização numérica]]></kwd>
<kwd lng="en"><![CDATA[infiltration]]></kwd>
<kwd lng="en"><![CDATA[numerical optimization]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <div align="center">       <p><b>Equação de green-ampt para a infiltração da água no solo aproximações      numéricas para explicitação do volume infiltrado </b></p>       <p><b>Green-ampt equation for water infiltration into soil numerical approximations      to the explicit formulation for the accumulated water </b> </p> </div>     <P align="center"> Francisco Mercês de Mello<Sup><a href="#1">1</a><a name="top1"></a></Sup></P>     <P align="center">&nbsp;</P>     <P > RESUMO </P>     <P align="justify" > O modelo de infiltração de Green-Ampt (1911), muito utilizado    ainda hoje em Hidrologia, não permite explicitar de forma exacta o volume acumulado    por infiltração em função do tempo. É neste contexto que se insere o presente    estudo ,no qual são propostas duas soluções aproximadas. A primeira equação    é original e a segunda resulta de modificações introduzidas numa das equações    de Li et al. (1976). Analisaram-se os erros relativos provenientes da aplicação    destas equações e apresenta-se um exemplo para melhor concretizar a aplicação    destas aproximações numéricas. </P>     <P> <b>Palavras-chave</b>: infiltração, optimização numérica. </P>     <P>&nbsp; </P>     <P> ABSTRACT </P>     ]]></body>
<body><![CDATA[<P align="justify"> The Green-Ampt infiltration model (1911), still used in Hydrology    nowadays, does not allows to have an exact explicitation of the accumulated    infiltration water versus time. The present work tries to solve this problem    by presenting two solutions. The first equation is original and the second is    the result of some improvements made in one of Li et al equations (1976).The    relative errors proceeding from these equation were discussed and one example    is presented in order to concretize these numerical applications. </P>     <P > <b>Key-words</b>: infiltration, numerical optimization. </P>     <P >&nbsp;</P>     <P >Texto completo disponível apenas em PDF.</P>     <p>Full text only available in PDF format.</p>     <p>&nbsp;</p>     <P >&nbsp; </P>     <P align="center"> <b>REFERÊNCIAS BIBLIOGRÁFICAS </b></P>     <!-- ref --><P>Ahuja, L.R. (1974) - Applicability of the Green-Ampt approach to water infiltration    through surface crust. Soil Science 18 (5):283-288. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000021&pid=S0871-018X200800010000400001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><P>Bower, H. (1969) - Infiltration of Water into Nonuniform Soil. J. Irrigation    and Drainage Division. Am. Soc. Civ. Engrs 95(IR4):451-462. </P>     ]]></body>
<body><![CDATA[<P> Bower, H. (1976) - Infiltration into Increasingly Permeable Soils. J. Irrigation    and Drainage Division. Am.Soc.Civ.Engrs 102(IR1):127-136. </P>     <P > Childs, E.C.; Bybordi, M.(1969) - The Vertical Movement of Water in Stratified    Porous Material. 1.Infiltration. Water Resources Research 5(2): 446-459. </P>     <P> Chong, S.K.(1979) -Infiltration prediction based on in-situ measurements of    soil water properties. Ph. D. Dissertation, University of Hawaii. </P>     <P >Chu, S.T.(1978)-Infiltration During an Unsteady Rain. Water Resources Research    14. (3):461-466. </P>     <P >Green,W.H.; Ampt, G. A.(1911) - Studies on soil physics-Part I-The flow of    air and water through soils. J of Agric. Sci IV, May:1-24. </P>     <P > Hillel, D.; Gardner, W. R.(1970) - Transient infiltration into crust topped    profiles. Soil Science 109:410-416. </P>     <P > Li, R.Stevens, M.; Simons, D. (1976) - Solutions to Green-Ampt Infiltration    Equation. J.Irrigation and Drainage Division. Am.Soc.Civ.Engrs 102 (IR2):239-248.  </P>     <P > Morel-Seyroux, H. J.; Khanji, J.(1974) - Derivation of an Equation of Infiltration.    Water Resources Research 10(4):795-800. </P>     <P> Nelder, J.; Mead, R.(1964) - A Simplex Method for Function Minimization. The    Computer Journal 7 : 308-315. </P>     <P>&nbsp;</P>     ]]></body>
<body><![CDATA[<P><sup><a href="#top1">1</a></sup><a name="1"></a> Professor Associado. Doutor    em Engenharia Agrícola</P>     <P>&nbsp;</P>     <P>Recepção/Reception: 2004.04.20</P>     <P align="left" >Aceitação/Acception: 2007.03.20</P>     <P align="center">&nbsp;</P>      ]]></body><back>
<ref-list>
<ref id="B1">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ahuja]]></surname>
<given-names><![CDATA[L.R.]]></given-names>
</name>
</person-group>
<article-title xml:lang="en"><![CDATA[Applicability of the Green-Ampt approach to water infiltration through surface crust.]]></article-title>
<source><![CDATA[Soil Science]]></source>
<year>1974</year>
<volume>18</volume>
<numero>5</numero>
<issue>5</issue>
<page-range>283-288</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
