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Bibliographic Details
Main Author:	Uilson Ricardo Venâncio Aires
Format:	Artículo científico
Language:	pt
Published:	Universidade Federal do Paraná 2017
Subjects:	Agrociencias tendência temporal Google Earth Engine Testes não paramétricos
Online Access:	https://www.redalyc.org/articulo.oa?id=99553122002
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USO DE NDVI PARA ANÁLISE DO COMPORTAMENTO DO REGIME DE VAZÕES DO RIO PARAOPEBA, MG Uilson Ricardo Venâncio Aires José de Oliveira Melo Neto Jasmine Alves Campos Agrociencias tendência temporal Google Earth Engine Testes não paramétricos O comportamento não estacionário de séries de dados hidrológicos configura - se como um desafio para a gestão e planejamento dos recursos hídricos, pois este modelo atual considera que não há alterações significativas nas séries hidrológicas ao longo do temp o. Neste contexto, o objetivo deste trabalho foi verificar o comportamento no regime fluviométrico no Rio Paraopeba, MG, em decorrência das modificações da cobertura vegetal. A estação fluviométrica utilizada está localizada no município de Juatuba, MG. A série possui período de observação de 76 anos (1938 a 2014). Para verificar a hipótese de estacionariedade e de tendência temporal foram utilizados os testes de Spearman e Mann Kendall com nível de significância de 5%. Para a verificação da alteração da co bertura vegetal foi utilizado o Índice Vegetativo por Diferença Normalizada (NDVI), obtido através da plataforma Google Earth Engine (GEE) para os períodos: anual (janeiro a dezembro), chuvoso (outubro a março) e seco (abril a setembro). Observou - se aument o das áreas de cobertura vegetal com alto vigor vegetativo na região correspondente a área de contribuição da estação fluviométrica, o qual pode ter influenciado na tendência de redução das vazões máximas e mínimas. 2017 artículo científico 1519-1125 https://www.redalyc.org/articulo.oa?id=99553122002 pt http://www.redalyc.org/revista.oa?id=995 Scientia Agraria application/pdf Universidade Federal do Paraná Scientia Agraria (Brasil) Num.3 Vol.18

if (filemtime($filename) + $maxlifetime < time()) { unlink($filename); $count++; } } return $count; } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ protected function saveSession($sessId, $data): bool { $sessFile = $this->path . '/sess_' . $sessId; if ($handle = fopen($sessFile, 'w')) { $return = false; // Lock the file for exclusive access to avoid issues with multiple // processes writing session simultaneously: if (flock($handle, LOCK_EX)) { $return = fwrite($handle, $data); // Make sure that there's no trailing data by truncating the file to // the correct length: ftruncate($handle, strlen($data)); fflush($handle); flock($handle, LOCK_UN); } fclose($handle); if ($return !== false) { return true; } } // If we got this far, something went wrong with the file output... // It is tempting to throw an exception here, but this code is called // outside of the context of exception handling, so all we can do is // echo a message.

// Anecdotal testing Today and Yesterday seems to indicate destroy() // is called by the garbage collector and everything is good. // Something to keep in mind though. return 0; } /** * Write function that is called when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ public function write($sessId, $data): bool { if ($this->writesDisabled) { return true; } return $this->saveSession($sessId, $data); } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ abstract protected function saveSession($sessId, $data): bool; }

* * @return void */ public function writeClose() { // The assumption is that we're using PHP's ext/session. // session_write_close() will actually overwrite $_SESSION with an // empty array on completion -- which leads to a mismatch between what // is in the storage object and $_SESSION. To get around this, we // temporarily reset $_SESSION to an array, and then re-link it to // the storage object. // // Additionally, while you _can_ write to $_SESSION following a // session_write_close() operation, no changes made to it will be // flushed to the session handler. As such, we now mark the storage // object isImmutable. $storage = $this->getStorage(); if (! $storage->isImmutable()) { $_SESSION = $storage->toArray(true); session_write_close(); $storage->fromArray($_SESSION); $storage->markImmutable(); } } /** * Attempt to set the session name * * If the session has already been started, or if the name provided fails * validation, an exception will be raised. * * @param string $name * @return SessionManager * @throws Exception\InvalidArgumentException */ public function setName($name) { if ($this->sessionExists()) { throw new Exception\InvalidArgumentException( 'Cannot set session name after a session has already started'

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