The geochemistry in the Manzanares river floodplain sediments as a way to assess environmental impact

P. Adánez; A. García Cortés; J. Locutura

doi:10.21701/bolgeomin.120.1.007

Authors

P. Adánez Instituto Geológico y Minero de España
A. García Cortés Instituto Geológico y Minero de España
J. Locutura Instituto Geológico y Minero de España

DOI:

https://doi.org/10.21701/bolgeomin.120.1.007

Keywords:

floodplain, geochemistry, Madrid, Manzanares, trace elements

Abstract

Floodplains are an important component of drainage systems, as they act like transport channels and stores or sinks for suspended sediment deposited during the floods. A geochemical study in floodplain sediments is a reliable method to reconstruct the evolution of anthropic contamination through time in a basin. As an application of this method, the floodplain of the Manzanares River (Madrid) has been examined, as an example of urban environment. Samples have been collected through the floodplain vertical profile at two different selected sites upstream and downstream the city of Madrid. The samples have been sieved at six sizes of grain in which trace elements have been analysed by ICP-MS and INAA. This study highlights an increase in the contents of contaminant elements in the profile sampled downstream as well as an enrichment of these elements as the sediment is younger.

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