Influência de eventos hidrológicos extremos na qualidade da água de reservatórios na região tropical semiárida

Figueiredo, Aline do Vale; Becker, Vanessa

Aline do Vale Figueiredo

Universidade Federal do Maranhão, São Luís, MA, Brasil

Vanessa Becker

Universidade Federal do Rio Grande do Norte, Natal, RN, Brasil

E-mails: alinefigueiredo_@hotmail.com (AVF), becker.vs@gmail.com (VB)

Aline do Vale Figueiredo: Participated in the execution of the monitoring, sample analysis, data analysis, bibliographical revision, discussion, paper writing and translation.

Vanessa Becker: Contributed to the conception of the work, execution of monitoring, data acquisition and treatment, discussion and writing supervision.

Figuras (5)
Tabelas (1)

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Figure 1
Geographical location of Cruzeta reservoir and Gargalheiras reservoir, showing the sample station (P1).

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Figure 2
Monthly rainfall accumulated between June 2010 and May 2014, and the rainfall historical average for the period between 1963 and 2013 for the region (Source: EMPARN, 2014 EMPARN – EMPRESA DE PESQUISA AGROPECUÁRIO DO RIO GRANDE DO NORTE. Dados de precipitação. Natal, 2014. Available from: <http//www.emparn.rn.gov.br//>. Access on: 11 Dec. 2014. ). SPI12: months extremely humid, severely humid, moderately humid, normal, moderately dry, severely dry and extremely dry (Source: INMET, 2014 INMET – INSTITUTO NACIONAL DE METEOROLOGIA. Índice de Precipitação Padronizada (SPI). Brasília, 2014. Available from: <http://www.inmet.gov.br/portal/index.php?r=clima/indicePrecipitacaoPadronizada>. Access on: 15 Dec. 2014.
http://www.inmet.gov.br/portal/index.ph... ). (A) Gargalheiras; (B) Cruzeta.

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Figure 3
Variation of the volume stored (%) of the Gargalheiras reservoir and Cruzeta reservoir during the period June 2010 and May 2014. (Source: SEMARH, 2014 SEMARH – SECRETARIA DE ESTADO DO MEIO AMBIENTE E DOS RECURSOS HÍDRICOS DO RIO GRANDE DO NORTE. Dados de volume. Natal, 2014. Available from: <http//www.semarh.rn.gov.br//>. Access on: 10 Dec. 2014. ). (A) Gargalheiras; (B) Cruzeta.

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Figure 4
Principal component analysis (PCA) of the Gargalheiras reservoir during the period June 2010 and May 2014, including the limnological variables.

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Figure 5
Principal component analysis (PCA) of the Cruzeta reservoir during the period June 2010 and May 2014, including the limnological variables.

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Table 1
Descriptive statistics (minimum, maximum, average and standard deviation) of the limnological variables studied at the Gargalheiras reservoir and Cruzeta reservoir sample station (P1) during periods identified by rainy season and dry season (periods I and II).

Variables	GARGALHEIRAS		CRUZETA
Variables	Period I	Period II	Period I	Period II
Zmax (m)	14.3-20.2 (17.9 ± 1.9)	7.0-19.5 (14.0 ± 3.0)	4.5-8.7 (6.7 ± 1.2)	0.3-5.7 (3.4 ± 1.4)
Secchi (m)	0.35-2.10 (0.76 ± 0.41)	0.15-0.50 (0.28 ± 0.09)	0.20-1.00 (0.62 ± 0.21)	0.05-0.80 (0.47 ± 0.18)
T (°C)	23.8-31.0 (27.4 ± 1.9)	24.6-33.7 (28.6 ± 2.3)	24.5-33.9 (28.1 ± 2.5)	24.9-33.4 (29.0 ± 2.4)
OD (mg L^-1)	6.79-16.87 (10.87 ± 2.97)	4.10-21.65 (11.17 ± 4.05)	4.17-17.52 (10.16 ± 3.64)	1.40-14.92 (7.33 ± 2.68)
C (µS cm^-1)	340.0-927.0 (697.7 ± 150.4)	867.0-2070.0 (1190.0 ± 301.2)	289.0-1225.0 (683.5 ± 280.9)	210.0-1713.0 (966.1 ± 429.5)
pH	7.7-10.6 (8.8 ± 0.6)	6.7-10.3 (9.2 ± 0.7)	6.7-10.0 (8.3 ± 0.8)	7.7-10.3 (8.4 ± 0.6)
ISS (mg L^-1)	0.0-18.8 (3.2 ± 3.9)	0.0-13.5 (4.9 ± 4.0)	0.0-11.7 (4.6 ± 3.6)	0.4-29.5 (11.1 ± 8.1)
OSS (mg L^-1)	0.9-36.5 (11.9 ± 9.6)	6.0-43.6 (24.0 ± 9.6)	4.4-37.4 (12.9 ± 9.8)	0.9-14.0 (6.9 ± 3.8)
TP (µg L^-1)	21.67-147.83 (99.42 ± 30.16)	55.20-342.00 (212.17 ± 91.00)	37.23-194.15 (88.80 ± 52.29)	21.20-517.00 (160.14 ± 133.02)
NO₃^- (µg L^-1)	42.00-104.46 (78.12 ± 17.73)	46.50- 309.50 (133.42 ± 58.37)	24.50-132.59 (87.31 ± 29.98)	42.50- 287.50 (136.59 ± 62.38)
SRP (µg L^-1)	0.00-104.33 (23.45 ± 28.40)	2.57- 138.83 (27.63 ± 39.63)	0.00-67.42 (14.48 ± 17.49)	4.50- 269.50 (94.28 ± 69.84)
Chla (µg L^-1)	5.82-162.11 (72.17 ± 48.17)	41.25- 348.68 (186.78 ± 70.54)	5.86-162.73 (49.59 ± 41.05)	2.40- 167.87 (24.14 ± 34.35)

[1] E-mails: alinefigueiredo_@hotmail.com (AVF), becker.vs@gmail.com (VB)

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Influência de eventos hidrológicos extremos na qualidade da água de reservatórios na região tropical semiárida

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