Rainfall estimates through the lightning occurrences within the Tocantins river basin
| Autor: | Marcela Machado Pompeu, José Ricardo Santos de Souza, Wanda Maria do Nascimento Ribeiro |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Atmospheric Science
geography geography.geographical_feature_category Amazon rainforest Geography Planning and Development Drainage basin Numerical models Lightning Meso scale Geophysics Precipitation Computers in Earth Sciences Cartography Geomorphology Earth-Surface Processes General Environmental Science |
| Zdroj: | Revista Brasileira de Geografia Física. 9 |
| ISSN: | 1984-2295 |
| DOI: | 10.5935/1984-2295.20160069 |
| Popis: | O objetivo desse estudo foi estimar a precipitacao media quinzenal na bacia do Rio Tocantins a partir de dados observados simultaneamente de ocorrencia de raios, incidentes em area a montante da represa da Hidroeletrica de Tucurui. Em geral, a relacao entre essas variaveis nao e linear e pode variar com o clima regional. Como a Amazonia ja e razoavelmente coberta por redes de monitoramento continuo das ocorrencias de raios, esse estudo pode contribuir para corrigir deficiencias na obtencao de dados de precipitacao, por outros meios de observacao, nessa Regiao. As estimativas poderao subsidiar modelos numericos para previsao de secas, enchentes e nivel de agua nas represas. Foram utilizados dados de raios coletados pela rede STARNET no periodo de setembro 2008 a setembro de 2010 e dados de chuva disponibilizados por varios sistemas de observacao de superficie. Os resultados das analises desses dois anos mostraram que as medias quinzenais de ocorrencias de raios e chuvas tem um comportamento sazonal semelhante, influenciado pelas oscilacoes de sistemas de grande escala como a ZCIT e ZCAS, e outros sistemas em meso escala. Correlacoes entre as variaveis foram apresentadas. Analises da relacao entre cota de rios e raios indicaram que para periodos curtos houve boa correlacao entre essas variaveis. Portanto o metodo desenvolvido nesse trabalho pode ser estendido satisfatoriamente e a baixo custo para suprir deficiencias das redes de observacoes pluviometricas ou hidrologicas em outras bacias hidrograficas e/ou areas de caracteristicas fisiograficas distintas e de grande interesse socioeconomico na Amazonia. Normal 0 false false false PT-BR X-NONE X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Tabela normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin-top:0in; mso-para-margin-right:0in; mso-para-margin-bottom:8.0pt; mso-para-margin-left:0in; line-height:107%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri",sans-serif; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-ansi-language:PT-BR;} A B S T R A C T The main objective of this study was to estimate the biweekly average precipitation within the Tocantins River basin, using simultaneous data from lightning occurrences over an area up river from the Tucurui hydroelectric power dam. In general, the relation between these variables is not linear and may vary according to the regional climate. Considering that t he Amazon Region is now reasonably covered by continuous monitoring lightning detection networks, this study will contribute to correct precipitation data collection deficiencies, by other means, in this Region. These estimates may subsidize numerical models to forecast droughts, floods and the water level at the reservoirs. Lightning events data collected by the STARNET system between September 2008 and September 2010 were processed, as well as, rainfall data from the available surface observation systems. The results from the analysis for this two years period showed that, both the biweekly averages of the lightning occurrences and rainfall have similar seasonal behaviors, influenced by large scale systems oscillations such as the ITCZ and SACZ, and meso scale systems. The correlations between these variables were presented in the work. Analysis of the river levels versus lightning numbers over short periods showed a good correlation between these variables. Therefore, the developed methodology for this work can be extended satisfactorily and at low cost, to remedy deficiencies of pluviometric and hydrologic observation networks, in other hydrographic basins and/or areas of distinct physiographic characteristics and great socio economic interest in the Amazon Region. Keywords : Amazon Region. Lightning. Rainfall. Hydrographic Basins |
| Databáze: | OpenAIRE |
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