Trends in nutrient and sediment retention in Great Plains reservoirs (USA)

Autor(es)

Fernandes Cunha, Davi Gasparini ^[1] ; Calijuri, Maria do Carmo ^[1] ; Dodds, Walter Kennedy ^[2]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Escola Engn Sao Carlos, Dept Hidraul & Saneamento, BR-13560590 Sao Paulo - Brazil

^[2] Kansas State Univ, Div Biol, Manhattan, KS 66506 - USA

• Tipo de documento: Artigo Científico
• Fonte: ENVIRONMENTAL MONITORING AND ASSESSMENT; v. 186, n. 2, p. 1143-1155, FEB 2014.
• Citações Web of Science: 14

Resumo

Reservoirs are artificial ecosystems with physical, chemical, and biological transitional characteristics between rivers and lakes. Greater water retention time in reservoirs provides conditions for cycling materials inputs from upstream waters through sedimentation, biological assimilation and other biogeochemical processes. We investigated the effects of reservoirs on the water quantity and quality in the Great Plains (Kansas, USA), an area where little is known about these dominant hydrologic features. We analyzed a 30-year time-series of discharge, total phosphorus (TP), nitrate (NO3 (-)), and total suspended solids (TSS) from six reservoirs and estimated overall removal efficiencies from upstream to downstream, testing correlations among retention, discharge, and time. In general, mean removal of TP (42-74 %), TSS (0-93 %), and NO3 (-) (11-56 %) from upstream to downstream did not change over 30 years. TP retention was associated with TSS removal, suggesting that nutrient substantial portion of P was adsorbed to solids. Our results indicated that reservoirs had the effect of lowering variance in the water quality parameters and that these reservoirs are not getting more or less nutrient-rich over time. We found no evidence of temporal changes in the yearly mean upstream and downstream discharges. The ratio upstream/downstream discharge was analyzed because it allowed us to assess how much contribution of additional unsampled tributaries may have biased our ability to calculate retention. Nutrient and sediment removal was less affected by hydraulic residence time than expected. Our study demonstrates that reservoirs can play a role in the removal and processing of nutrient and sediments, which has repercussions when valuing their ecological services and designing watershed management plans. (AU)

• Processo FAPESP: 09/50842-2 - Heterogeneidade espacial e variabilidade temporal do reservatório de Itupararanga: uma contribuição ao manejo sustentável dos recursos hídricos da Bacia do Rio Sorocaba (SP)
• Beneficiário: Davi Gasparini Fernandes Cunha
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto