22-27 September 2019
Trade Fairs and Congress Center (FYCMA)
Europe/Madrid timezone

A global dataset of simulated karstic groundwater recharge to support water management and speleothem analysis

26 Sep 2019, 12:15
15m
Conference room 2.1 ()

Conference room 2.1

Oral Topic 7 - Karst Hydrogeology Parallel

Speaker

Prof. Andreas Hartmann (Chair of Hydrological Modeling and Water Resources, University of Freiburg, Germany; Department of Civil Engineering, University of Bristol, UK)

Description

Large-scale assessment of karstic groundwater recharge has been receiving increased attention because of the need to support national and international decision making and water policy. Also, the inclusion of above-cave karst recharge processes just recently showed to considerably improve the reconstruction of past climates using speleothem records. However, at many regions or caves, quantitative assessments of karstic recharge are not available. In this study, we present the first results of a large-scale karst recharge model that is applied over all karst regions in the world. As a starting point, we use a previously continental karst recharge model and the World Karst Aquifer Map (WoKAM). The model input (precipitation, potential evapotranspiration) is derived from the Global Land Data Assimilation System GLDAS. Similar to the continental scale model, we use observed latent heat fluxes and soil moisture observations freely available from global data bases for estimating the model parameters. For model evaluation, we use annual averages of stream discharge of catchments that are mainly covered by carbonate rock. Yet uncertain compared to local or regional studies, the simulated recharge volumes derived from this first global karst recharge model will provide valuable information for water management and speleothem interpretation at regions were hydrological measurements are scarce or completely missing.

Primary author

Prof. Andreas Hartmann (Chair of Hydrological Modeling and Water Resources, University of Freiburg, Germany; Department of Civil Engineering, University of Bristol, UK)

Co-author

Vera Marx (Chair of Hydrological Modeling and Water Resources, University of Freiburg, Germany)

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