Analysis Of Long Term Hydrological Records To
Assess The Changing Regime And Pathways In
Oil Shale Mining Districts Of North East Estonia
Author(s)
R. Vaht, W. M. Mayes, M. Sepp, A. Järvet & Ü. Mander
Abstract
This paper documents long term (1923-2005) changes in surface drainage areas
and run-off characteristics in two small to medium (100-1000 km2) rivers
draining part of the Ordovician oil shale field of north east Estonia. The
changing regime in the heavily mined catchments is contrasted with a
morphologically similar reference catchment (River Keila) where there has been
no mining activity. Coupling of flow regime with mining records (discharge
rates and workings locations) is undertaken to assess the impact of expansion in
oil shale mining through the mid to late 20th century on downstream flow regime
and pathways. The study shows that during phases of intense mining, summer
baseflow is between 53-72% higher than long term average baseflow in the
Purtse catchment and between 66-92% higher in the smaller Pühajõgi catchment
where the volumetric significance of mine discharges is greater. The Keila
catchment does not show any significant change in summer baseflow during the
study period suggesting that the changes in the Pühajõgi and Purtse are not
controlled by climatic drivers. Assessment of mine flow records highlights the
significant augmentation of baseflow in the mined catchments.
Keywords: hydrological regime, baseflow, minimum run-off, mine water.
Keywords
hydrological regime, baseflow, minimum run-off, mine water
Related Book
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