The challenges of hydrological drought definition, quantification and communication: an interdisciplinary perspective
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Published:2020-09-16
Issue:
Volume:383
Page:291-295
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ISSN:2199-899X
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Container-title:Proceedings of the International Association of Hydrological Sciences
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language:en
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Short-container-title:Proc. IAHS
Author:
Stahl KerstinORCID, Vidal Jean-PhilippeORCID, Hannaford Jamie, Tijdeman Erik, Laaha GregorORCID, Gauster TobiasORCID, Tallaksen Lena M.ORCID
Abstract
Abstract. Numerous indices exist for the description of
hydrological drought. The EURO FRIEND-Water Low flow and Drought Group has
repeatedly discussed changing paradigms in the perception and use of
existing and emerging new indices for hydrological drought identification
and characterization. Group members have also tested the communication of
different indices to stakeholders in several national and international
transdisciplinary research projects. This contribution presents the
experience gained with regard to the purpose and applicability of different
classes of drought indices. A recent paradigm shift is the use of anomalies,
traditionally from climatology, in hydrology. For instance, anomaly-based
indices, such as the Standardized Streamflow Index (SSI) and the variable
threshold level method to define streamflow deficiencies, are used
increasingly for real-time monitoring. How these indices relate to low flows
and their impacts may have become less clear as a result. Assessments of the
severity of a particular drought may also differ depending on whether return
periods based on traditional low flow or drought frequency analyses or
whether SSI time series index values are used. These experiences call for a
systematic comparison, classification and evaluation of different low flow
and drought indices and their usages.
Funder
Deutsche Forschungsgemeinschaft Natural Environment Research Council
Publisher
Copernicus GmbH
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