The influence of castanhão reservoir on nutrient and suspended matter transport during rainy season in the ephemeral Jaguaribe river (CE, Brazil)

Brazilian Journal of Biology

Mm. Molisani²  H. Becker¹  Hs. Barroso¹  Cag. Hijo¹  Tm. Monte¹  Gh. Vasconcellos¹  Ld. Lacerda¹ 

[1] ,Universidade Federal do Rio de Janeiro Núcleo em Ecologia e Desenvolvimento Sócio-Ambiental de Macaé Macaé RJ ,Brazil

关键词: dam;    semi-arid;    nutrient budget;    sediment retention;    impoundment;    barragem;    semiárido;    balanço de nutrientes;    retenção de sedimentos;    represamento de águas;   

DOI  :  10.1590/S1519-69842013000100013

来源: SciELO

【 摘 要 】

Measurements of nutrient and suspended matter concentrations and loads entering and leaving the Castanhão reservoir during the rainy season were carried out to assess the influence of this large reservoir on land-sea fluvial transport in the ephemeral Jaguaribe river basin. Spatial variation indicated statistically significant attenuation of concentrations only for total phosphorous and suspended matter across the reservoir. Strong retention of nutrients and suspended matter loads by the reservoir was observed with average trapping efficiency of 89% for dissolved silicon, 98% of soluble reactive phosphorus, 71% for ammonium, 87% for total nitrogen, 98% for total phosphorus and 97% for suspended matter compared to the reservoir inflow. The dam operational procedure defined by the ephemeral conditions of the river reduced water releases compared to reservoir inflow and induced strong retention of nutrient and suspended matter loads within the reservoir when fluvial transfer occurs in this semiarid watershed.

【 授权许可】

CC BY   
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