Spatial and seasonal variations of surface and groundwater quality in a fast-growing city: Lubango, Angola
Lubango is a fast-growing city of Angola, with a very deficient water distribution public system. The majority of the population uses groundwater from shallow, rudimentary dug wells and also surface water from the Mapunda River, which crosses the city. The city has very poor systems for collecting d...
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| description | Lubango is a fast-growing city of Angola, with a very deficient water distribution public system. The majority of the population uses groundwater from shallow, rudimentary dug wells and also surface water from the Mapunda River, which crosses the city. The city has very poor systems for collecting domestic sewage and household wastes. The majority of domestic sewage is dumped directly into the Mapunda River or in pit latrines. In this study, the surface water quality and groundwater quality were assessed. In surface water, the low oxygen contents are related to the high temperature (
T
) in the warm rainy season and with high contents of oxygen-consuming organic pollution and nutrients, as shown by PCA, in both seasons. Anoxic conditions, with negative ORP values (− 55.7 mV), are caused by oxygen-consuming organic pollution, added with low flow regime during the dry, cold season. The very low ecological quality of the surface water is also indicated by the high contents of PO
4
and Cl
t
(up to 2.00 and 0.44 mg L
−1
, respectively). The phosphate contamination is higher in the warm rainy season, due to higher run-off and higher
T
, as expressed by PCA, both in river water and groundwater. Most groundwater sampling points are contaminated with nitrate (contents up to 132 mg L
−1
). The pH, total dissolved solids (TDS), alkalinity, Cl
t
and K, determined in the surface water reflect the anthropic contribution to the river water. The variations in water bulk parameters (T, TDS, alkalinity, ORP, DO) and chemical species are indicative of pollution by diffuse sources (N-species, phosphates). The PCA shows that non-point sources such as the free discharge of household wastewater, intense laundering in the river, agriculture and animal grazing are the main contributors to low water quality, associated with seasonality and low contents of dissolved oxygen due to its consumption by organic matter. The multivariate analysis allows the evaluation of the changes in water quality, in fast-growing cities where the climate has a clear seasonality. |
| doi_str_mv | 10.1007/s12665-017-7149-9 |
| format | Article |
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T
) in the warm rainy season and with high contents of oxygen-consuming organic pollution and nutrients, as shown by PCA, in both seasons. Anoxic conditions, with negative ORP values (− 55.7 mV), are caused by oxygen-consuming organic pollution, added with low flow regime during the dry, cold season. The very low ecological quality of the surface water is also indicated by the high contents of PO
4
and Cl
t
(up to 2.00 and 0.44 mg L
−1
, respectively). The phosphate contamination is higher in the warm rainy season, due to higher run-off and higher
T
, as expressed by PCA, both in river water and groundwater. Most groundwater sampling points are contaminated with nitrate (contents up to 132 mg L
−1
). The pH, total dissolved solids (TDS), alkalinity, Cl
t
and K, determined in the surface water reflect the anthropic contribution to the river water. The variations in water bulk parameters (T, TDS, alkalinity, ORP, DO) and chemical species are indicative of pollution by diffuse sources (N-species, phosphates). The PCA shows that non-point sources such as the free discharge of household wastewater, intense laundering in the river, agriculture and animal grazing are the main contributors to low water quality, associated with seasonality and low contents of dissolved oxygen due to its consumption by organic matter. The multivariate analysis allows the evaluation of the changes in water quality, in fast-growing cities where the climate has a clear seasonality.</description><identifier>ISSN: 1866-6280</identifier><identifier>EISSN: 1866-6299</identifier><identifier>DOI: 10.1007/s12665-017-7149-9</identifier><language>eng</language><publisher>Berlin/Heidelberg: Springer Berlin Heidelberg</publisher><subject>Agricultural wastes ; Agriculture ; Alkalinity ; Anoxia ; Anoxic conditions ; Biogeosciences ; Chemical speciation ; Cold season ; Contamination ; Dissolved oxygen ; Domestic wastewater ; Dug wells ; Earth and Environmental Science ; Earth Sciences ; Environmental Science and Engineering ; Evaluation ; Geochemistry ; Geology ; Groundwater ; Groundwater quality ; High temperature ; Household wastes ; Hydrology/Water Resources ; Latrines ; Low flow ; Mineral nutrients ; Multivariate analysis ; Nutrients ; Organic matter ; Original Article ; Oxygen ; Oxygen consumption ; pH effects ; Phosphates ; Point source pollution ; Pollution ; Pollution sources ; Quality assessment ; Rainy season ; River water ; Rivers ; Runoff ; Seasonal variation ; Seasonal variations ; Seasons ; Sewage ; Spatial distribution ; Species diffusion ; Surface water ; Surface water quality ; Surface-groundwater relations ; Terrestrial Pollution ; Total dissolved solids ; Washing ; Wastewater ; Water analysis ; Water distribution ; Water engineering ; Water pollution ; Water quality ; Water sampling ; Wet season</subject><ispartof>Environmental earth sciences, 2017-12, Vol.76 (23), p.1-17, Article 790</ispartof><rights>Springer-Verlag GmbH Germany, part of Springer Nature 2017</rights><rights>Environmental Earth Sciences is a copyright of Springer, (2017). All Rights Reserved.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a339t-190439db74788e4069171ab6769fb4edb4780422d66de41512cd22d9051028f93</citedby><cites>FETCH-LOGICAL-a339t-190439db74788e4069171ab6769fb4edb4780422d66de41512cd22d9051028f93</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://link.springer.com/content/pdf/10.1007/s12665-017-7149-9$$EPDF$$P50$$Gspringer$$H</linktopdf><linktohtml>$$Uhttps://link.springer.com/10.1007/s12665-017-7149-9$$EHTML$$P50$$Gspringer$$H</linktohtml><link.rule.ids>314,776,780,27901,27902,41464,42533,51294</link.rule.ids></links><search><creatorcontrib>Silva, M. Manuela Vinha G.</creatorcontrib><creatorcontrib>Gomes, Elsa M. C.</creatorcontrib><creatorcontrib>Isaías, Malaquias</creatorcontrib><creatorcontrib>Azevedo, José Manuel M.</creatorcontrib><creatorcontrib>Zeferino, Benedito</creatorcontrib><title>Spatial and seasonal variations of surface and groundwater quality in a fast-growing city: Lubango, Angola</title><title>Environmental earth sciences</title><addtitle>Environ Earth Sci</addtitle><description>Lubango is a fast-growing city of Angola, with a very deficient water distribution public system. The majority of the population uses groundwater from shallow, rudimentary dug wells and also surface water from the Mapunda River, which crosses the city. The city has very poor systems for collecting domestic sewage and household wastes. The majority of domestic sewage is dumped directly into the Mapunda River or in pit latrines. In this study, the surface water quality and groundwater quality were assessed. In surface water, the low oxygen contents are related to the high temperature (
T
) in the warm rainy season and with high contents of oxygen-consuming organic pollution and nutrients, as shown by PCA, in both seasons. Anoxic conditions, with negative ORP values (− 55.7 mV), are caused by oxygen-consuming organic pollution, added with low flow regime during the dry, cold season. The very low ecological quality of the surface water is also indicated by the high contents of PO
4
and Cl
t
(up to 2.00 and 0.44 mg L
−1
, respectively). The phosphate contamination is higher in the warm rainy season, due to higher run-off and higher
T
, as expressed by PCA, both in river water and groundwater. Most groundwater sampling points are contaminated with nitrate (contents up to 132 mg L
−1
). The pH, total dissolved solids (TDS), alkalinity, Cl
t
and K, determined in the surface water reflect the anthropic contribution to the river water. The variations in water bulk parameters (T, TDS, alkalinity, ORP, DO) and chemical species are indicative of pollution by diffuse sources (N-species, phosphates). The PCA shows that non-point sources such as the free discharge of household wastewater, intense laundering in the river, agriculture and animal grazing are the main contributors to low water quality, associated with seasonality and low contents of dissolved oxygen due to its consumption by organic matter. The multivariate analysis allows the evaluation of the changes in water quality, in fast-growing cities where the climate has a clear seasonality.</description><subject>Agricultural wastes</subject><subject>Agriculture</subject><subject>Alkalinity</subject><subject>Anoxia</subject><subject>Anoxic conditions</subject><subject>Biogeosciences</subject><subject>Chemical speciation</subject><subject>Cold season</subject><subject>Contamination</subject><subject>Dissolved oxygen</subject><subject>Domestic wastewater</subject><subject>Dug wells</subject><subject>Earth and Environmental Science</subject><subject>Earth Sciences</subject><subject>Environmental Science and Engineering</subject><subject>Evaluation</subject><subject>Geochemistry</subject><subject>Geology</subject><subject>Groundwater</subject><subject>Groundwater quality</subject><subject>High temperature</subject><subject>Household wastes</subject><subject>Hydrology/Water Resources</subject><subject>Latrines</subject><subject>Low flow</subject><subject>Mineral nutrients</subject><subject>Multivariate analysis</subject><subject>Nutrients</subject><subject>Organic matter</subject><subject>Original Article</subject><subject>Oxygen</subject><subject>Oxygen consumption</subject><subject>pH effects</subject><subject>Phosphates</subject><subject>Point source pollution</subject><subject>Pollution</subject><subject>Pollution sources</subject><subject>Quality assessment</subject><subject>Rainy season</subject><subject>River water</subject><subject>Rivers</subject><subject>Runoff</subject><subject>Seasonal variation</subject><subject>Seasonal variations</subject><subject>Seasons</subject><subject>Sewage</subject><subject>Spatial distribution</subject><subject>Species diffusion</subject><subject>Surface water</subject><subject>Surface water quality</subject><subject>Surface-groundwater relations</subject><subject>Terrestrial Pollution</subject><subject>Total dissolved solids</subject><subject>Washing</subject><subject>Wastewater</subject><subject>Water analysis</subject><subject>Water distribution</subject><subject>Water engineering</subject><subject>Water pollution</subject><subject>Water quality</subject><subject>Water sampling</subject><subject>Wet season</subject><issn>1866-6280</issn><issn>1866-6299</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2017</creationdate><recordtype>article</recordtype><sourceid>BENPR</sourceid><recordid>eNp1kE9LxDAQxYMouKz7AbwFvBrNtNm08bYs_oOCB_Ucpm1autRkN2ld9tubtSJezCGZefnNg3mEXAK_Ac6z2wCJlEvGIWMZCMXUCZlBLiWTiVKnv3XOz8kihA2PJ4VUcTkjm9ctDh32FG1Ng8HgbGw-0XdRdjZQ19Aw-gYr84203o223uNgPN2N2HfDgXaWIm0wDCz-7jvb0irKd7QYS7Stu6arePd4Qc4a7INZ_Lxz8v5w_7Z-YsXL4_N6VTBMUzUwUFykqi4zkeW5EVwqyABLmUnVlMLUZdS5SJJaytoIWEJS1bFTfAk8yRuVzsnV5Lv1bjeaMOiNG31cK2hQMlcicjxSMFGVdyF40-it7z7QHzRwfUxVT6nqmKo-pqqPzsk0EyJrW-P_OP879AUcdXlO</recordid><startdate>20171201</startdate><enddate>20171201</enddate><creator>Silva, M. Manuela Vinha G.</creator><creator>Gomes, Elsa M. C.</creator><creator>Isaías, Malaquias</creator><creator>Azevedo, José Manuel M.</creator><creator>Zeferino, Benedito</creator><general>Springer Berlin Heidelberg</general><general>Springer Nature B.V</general><scope>AAYXX</scope><scope>CITATION</scope><scope>3V.</scope><scope>7ST</scope><scope>7TG</scope><scope>7UA</scope><scope>7XB</scope><scope>88I</scope><scope>8FK</scope><scope>ABUWG</scope><scope>AEUYN</scope><scope>AFKRA</scope><scope>ATCPS</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BHPHI</scope><scope>BKSAR</scope><scope>C1K</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>F1W</scope><scope>GNUQQ</scope><scope>H96</scope><scope>HCIFZ</scope><scope>KL.</scope><scope>L.G</scope><scope>M2P</scope><scope>PATMY</scope><scope>PCBAR</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PYCSY</scope><scope>Q9U</scope><scope>SOI</scope></search><sort><creationdate>20171201</creationdate><title>Spatial and seasonal variations of surface and groundwater quality in a fast-growing city: Lubango, Angola</title><author>Silva, M. Manuela Vinha G. ; Gomes, Elsa M. C. ; Isaías, Malaquias ; Azevedo, José Manuel M. ; Zeferino, Benedito</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a339t-190439db74788e4069171ab6769fb4edb4780422d66de41512cd22d9051028f93</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2017</creationdate><topic>Agricultural wastes</topic><topic>Agriculture</topic><topic>Alkalinity</topic><topic>Anoxia</topic><topic>Anoxic conditions</topic><topic>Biogeosciences</topic><topic>Chemical speciation</topic><topic>Cold season</topic><topic>Contamination</topic><topic>Dissolved oxygen</topic><topic>Domestic wastewater</topic><topic>Dug wells</topic><topic>Earth and Environmental Science</topic><topic>Earth Sciences</topic><topic>Environmental Science and Engineering</topic><topic>Evaluation</topic><topic>Geochemistry</topic><topic>Geology</topic><topic>Groundwater</topic><topic>Groundwater quality</topic><topic>High temperature</topic><topic>Household wastes</topic><topic>Hydrology/Water Resources</topic><topic>Latrines</topic><topic>Low flow</topic><topic>Mineral nutrients</topic><topic>Multivariate analysis</topic><topic>Nutrients</topic><topic>Organic matter</topic><topic>Original Article</topic><topic>Oxygen</topic><topic>Oxygen consumption</topic><topic>pH effects</topic><topic>Phosphates</topic><topic>Point source pollution</topic><topic>Pollution</topic><topic>Pollution sources</topic><topic>Quality assessment</topic><topic>Rainy season</topic><topic>River water</topic><topic>Rivers</topic><topic>Runoff</topic><topic>Seasonal variation</topic><topic>Seasonal variations</topic><topic>Seasons</topic><topic>Sewage</topic><topic>Spatial distribution</topic><topic>Species diffusion</topic><topic>Surface water</topic><topic>Surface water quality</topic><topic>Surface-groundwater relations</topic><topic>Terrestrial Pollution</topic><topic>Total dissolved solids</topic><topic>Washing</topic><topic>Wastewater</topic><topic>Water analysis</topic><topic>Water distribution</topic><topic>Water engineering</topic><topic>Water pollution</topic><topic>Water quality</topic><topic>Water sampling</topic><topic>Wet season</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Silva, M. Manuela Vinha G.</creatorcontrib><creatorcontrib>Gomes, Elsa M. 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Manuela Vinha G.</au><au>Gomes, Elsa M. C.</au><au>Isaías, Malaquias</au><au>Azevedo, José Manuel M.</au><au>Zeferino, Benedito</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Spatial and seasonal variations of surface and groundwater quality in a fast-growing city: Lubango, Angola</atitle><jtitle>Environmental earth sciences</jtitle><stitle>Environ Earth Sci</stitle><date>2017-12-01</date><risdate>2017</risdate><volume>76</volume><issue>23</issue><spage>1</spage><epage>17</epage><pages>1-17</pages><artnum>790</artnum><issn>1866-6280</issn><eissn>1866-6299</eissn><abstract>Lubango is a fast-growing city of Angola, with a very deficient water distribution public system. The majority of the population uses groundwater from shallow, rudimentary dug wells and also surface water from the Mapunda River, which crosses the city. The city has very poor systems for collecting domestic sewage and household wastes. The majority of domestic sewage is dumped directly into the Mapunda River or in pit latrines. In this study, the surface water quality and groundwater quality were assessed. In surface water, the low oxygen contents are related to the high temperature (
T
) in the warm rainy season and with high contents of oxygen-consuming organic pollution and nutrients, as shown by PCA, in both seasons. Anoxic conditions, with negative ORP values (− 55.7 mV), are caused by oxygen-consuming organic pollution, added with low flow regime during the dry, cold season. The very low ecological quality of the surface water is also indicated by the high contents of PO
4
and Cl
t
(up to 2.00 and 0.44 mg L
−1
, respectively). The phosphate contamination is higher in the warm rainy season, due to higher run-off and higher
T
, as expressed by PCA, both in river water and groundwater. Most groundwater sampling points are contaminated with nitrate (contents up to 132 mg L
−1
). The pH, total dissolved solids (TDS), alkalinity, Cl
t
and K, determined in the surface water reflect the anthropic contribution to the river water. The variations in water bulk parameters (T, TDS, alkalinity, ORP, DO) and chemical species are indicative of pollution by diffuse sources (N-species, phosphates). The PCA shows that non-point sources such as the free discharge of household wastewater, intense laundering in the river, agriculture and animal grazing are the main contributors to low water quality, associated with seasonality and low contents of dissolved oxygen due to its consumption by organic matter. The multivariate analysis allows the evaluation of the changes in water quality, in fast-growing cities where the climate has a clear seasonality.</abstract><cop>Berlin/Heidelberg</cop><pub>Springer Berlin Heidelberg</pub><doi>10.1007/s12665-017-7149-9</doi><tpages>17</tpages></addata></record> |
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| subjects | Agricultural wastes Agriculture Alkalinity Anoxia Anoxic conditions Biogeosciences Chemical speciation Cold season Contamination Dissolved oxygen Domestic wastewater Dug wells Earth and Environmental Science Earth Sciences Environmental Science and Engineering Evaluation Geochemistry Geology Groundwater Groundwater quality High temperature Household wastes Hydrology/Water Resources Latrines Low flow Mineral nutrients Multivariate analysis Nutrients Organic matter Original Article Oxygen Oxygen consumption pH effects Phosphates Point source pollution Pollution Pollution sources Quality assessment Rainy season River water Rivers Runoff Seasonal variation Seasonal variations Seasons Sewage Spatial distribution Species diffusion Surface water Surface water quality Surface-groundwater relations Terrestrial Pollution Total dissolved solids Washing Wastewater Water analysis Water distribution Water engineering Water pollution Water quality Water sampling Wet season |
| title | Spatial and seasonal variations of surface and groundwater quality in a fast-growing city: Lubango, Angola |
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