Geochemical indices and sedimentation rates in the Pardo River basin,São Paulo state,Brazil  

作　　者：Daniel Marcos Bonotto 

机构地区：[1]Instituto de Geociências e Ciências Exatas-IGCE,Universidade Estadual Paulista-UNESP,Av.24-A No.1515,P.O.Box 178,CEP 13506-900,Rio Claro,Sao Paulo,Brazil

出　　处：《International Journal of Sediment Research》2024年第5期804-824,共21页国际泥沙研究（英文版）

基　　金：Brazilian agencies National Council for Scientific;Technologic Development(CNPq)and Foundation for Supporting Research at Sao Paulo State(FAPESP)for financial support of this study through the grants CNPq 304010/2021-9 and 465571/2014-0;FAPESP 2014/50945-4 and 2021/11737-0.

摘　　要：Sediment geochemical indices and sedimentation rates data from the Pardo River watershed,São Paulo State,Brazil,provide relevant reference guidelines for stakeholders to plan future actions aiming to achieve the appropriate management of that hydrographic basin.The watershed includes 20 municipalities where about 650,000 inhabitants are living and whose waters after withdrawal and treatment supply∼300,000 people in that region.Six sediment cores provided the geochemical and radiometric dataset,which was obtained from sampling sites located in the following cities:Ourinhos,Santa Cruz do Rio Pardo,Águas de Santa Bárbara,Avaré,Botucatu,and Pardinho.The concentration data for some metals were compared with the reference values established by the Brazilian environmental legislation for sediment dredging because currently there is a lack of specific quality guidelines for marine or fluvial sediment in Brazil.Also,the entire dataset was used in the calculation of two traditional geochemical indices,i.e.,the enrichment factor(EF)and contamination factor(CF).In some cores,both indices provided insight revealing possible anthropogenic inputs of magnesium oxide(MgO),potassium oxide(K2O),sulfur trioxide(SO_(3)),vanadium oxide(V_(2)O_(5)),copper(Ⅱ)oxide(CuO),and other constituents due to development of activities related to the crop production.The constant rate of supply(CRS)of the unsupported/excess lead 210(^(210)Pb)model has been successfully applied to the obtained a radiometric^(210)Pb dataset,yielding mean values of the mass accumulation rate(MAR)between 0.86 and 7.23 g/(cm^(2)·y)and linear sedimentation rates(LSR)ranging from 2.9 to 7.1 cm/y.Both of these rates exhibited a significant correlation,representing physical weathering processes occurring in the basin.Chemical weathering rates reported in the literature indicate values much lower than the physical weathering rates and such findings have also been confirmed in the current study when the obtained data were compared with results from previous investigat

关 键 词：Sediment geochemistry Enrichment factor(EF) Contamination factor(CF) ^(210)Pb chronological method Sedimentation rates Pardo River watershed Brazil 

分 类 号：TV14[水利工程—水力学及河流动力学]