Drought Dynamics in Hydrological Systems
Summary
Drought dynamics within hydrological systems encompass the onset, propagation and cessation of water-deficit events across interconnected compartments of the water cycle. Meteorological drought, defined by precipitation shortfalls, may evolve through soil moisture depletion into agricultural and ultimately hydrological drought, affecting streamflow and groundwater reserves. Key controls on this propagation include climatic regime, catchment storage properties (soil, aquifer and snowpack) and land-cover characteristics that regulate evapotranspiration and runoff generation. Feedbacks between vegetation stress and soil moisture can either amplify or buffer drought severity, while human interventions such as reservoir operations and water abstraction further modulate the timing and magnitude of hydrological deficits. Improved understanding of these processes underpins early warning systems, informs water-resource management and guides adaptation strategies in a changing climate.
Research from Nature Portfolio
Recent studies have applied advanced remote-sensing assimilation techniques to track drought propagation from precipitation deficits through soil moisture into river discharge, revealing spatially explicit lags that vary with catchment storage and seasonality. A global modelling ensemble has quantified projected intensification of streamflow drought under warming scenarios, highlighting the critical role of subsurface storage in moderating deficit duration and severity. Another investigation deployed machine-learning algorithms to integrate land–atmosphere flux data for seasonal forecasting of hydrological drought, achieving enhanced lead times to support agricultural and urban water-supply planning.
Drought Dynamics in Hydrological Systems publication trend
The graph below shows the total number of articles in drought dynamics in hydrological systems across all publications each year (not limited to Nature Index journals).
Technical terms
Standardised Precipitation Index (SPI): A normalised measure of precipitation anomaly over a specified timescale, used to identify meteorological drought.
Standardised Streamflow Index (SSI): A standardised indicator of streamflow variability based on historical flow records, employed to characterise hydrological drought.
Drought propagation: The transmission of precipitation deficits through soil moisture, groundwater and surface water compartments.
Groundwater storage: The volume of water held in subsurface aquifers that sustains base flow and buffers hydrological droughts.
Copula: A statistical function modelling the dependence structure between variables such as precipitation and soil moisture to assess joint drought behaviour.
References
- Application of ESACCI SM product-assimilated to a statistical model to assess the drought propagation for different Agro-Climatic zones of India using copula. International Journal of Applied Earth Observation and Geoinformation (2024).
- Contrasting Drought Propagation Into the Terrestrial Water Cycle Between Dry and Wet Regions. Earth's Future (2023).
- A new perspective for assessing hydro-meteorological drought relationships at large scale based on causality analysis. Environmental Research Letters (2023).
- From meteorological to hydrological drought using standardised indicators. Hydrology and Earth System Sciences (2016).
- Hydrological drought across the world: impact of climate and physical catchment structure. Hydrology and Earth System Sciences (2013).
- Global hydrological droughts in the 21st century under a changing hydrological regime. Earth System Dynamics (2015).
- Understanding and seasonal forecasting of hydrological drought in the Anthropocene. Hydrology and Earth System Sciences (2017).
- Using paired catchments to quantify the human influence on hydrological droughts. Hydrology and Earth System Sciences (2019).
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