Publication: Silica sand slope gllying and mining in
Central Spain: erosion processes and
geomorphic reclamation of contour mining
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Publication Date
2008
Authors
Sanz Santos, Miguel Angel
Lucía Vela, Ana
Nicolau Ibarra, José Manuel
Pedraza Gilsanz, Javier de
Sánchez Castillo, Lázaro
Ruiz López de la Cova, Rafael
García, A.
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Publisher
Wessex Institute of Technology.
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Abstract
A Characterization and quantification of the geomorphic activity of three
scenarios of silica sand slops of Central Spain (Segovia and Guadalajara
province), is being carried out: (a) silica sand slope gullies; (b) Non reclaimed
(abandoned) silica sand mines; (c) abandoned silica sand mines reclaimed with a
geomorphic approach. On the silica sand slope gullies, gathered data point at
very high rates of erosion and sedimentation, since runoff and hydric erosion
occurs on them almost instantaneausly after precipitation. When no reclamation
is made, silica sand mines evolve like 'natural' gullies, and they show higher
tares of hydric erosion than them. The erosion of non-reclaimed silica sand
mines produces severe on and off sile environmental impacts. When
reclamations are made based on geomorphic approaches, runoff and soil erosion
can be reduced to the minimum at the pediment areas, whereas the highwalls can
maintain a geomorphic activity which integrates them into the landscape. The
understanding of these scenarios is allowing improving new reclamation plans
on silica sand and kaolin mines of Central Spain, concerning their topographical
and watershed design, and layout of the reconstructed terrain (waste dumps,
surficial deposits, and topsoil). The latter example shows a desirable framework
of collaboration between mining companies, protected areas managers and
universities