Name
Comparative Drought and Recovery Response Across the Atmosphere-Aquifer-Stream Continuum
Date & Time
Tuesday, May 26, 2026, 10:45 AM - 11:00 AM
Description
Droughts are already posing serious water resource management challenges globally, and future drought impacts are expected to be exacerbated due to a likely increase in the frequency, intensity, and duration of droughts around the world. However, most drought research understandably focuses on warm, arid regions, creating a knowledge gap for drought dynamics in colder, wetter regions. The overall goal of this study is to investigate hydrometeorological and hydrogeological drought through combined analyses of linked atmosphere, aquifer, and stream drought responses in Nova Scotia. Accordingly, we investigated spatiotemporal trends in meteorological (net precipitation), hydrogeological (groundwater level), and hydrological (baseflow) variables, using standardized indexes (Standardized Precipitation Evapotranspiration Index (SPEI), Standardized Groundwater Index (SGI), and Standardized Base Flow Index (SBFI)). The analyses explore how drought signals propagate across the atmosphere-aquifer-stream continuum, assess the strength and timing of cross-system relationships, and investigate the duration of drought events and recovery periods. Results indicate that more intense droughts are becoming more frequent and spatially extensive in Nova Scotia, with statistically significant trends particularly evident in the fall. The results reveal a strongly connected atmosphere-aquifer-stream hydrologic system. In most observation wells, SGI exhibited short (< 1 month) lag times and strong correlations with both SPEI and SBFI, a connection that weakened with increasing well depth. Unlike the consistent patterns of drought onset, recovery times vary, with groundwater taking much longer (up to 51 months) to recover to pre-drought conditions.
Location Name
DSU 224
Full Address
Dalhousie University
Halifax NS
Canada
Session Type
Oral Presentation
Abstract ID
21
Speaker Organization
Dalhousie University
Session Name
IAH-8
Co-authors
Nicole K. LeRoux, Audrey M. Hill, Rob C. Jamieson, Lauren D. Somers, Barret L. Kurylyk/ Department of Civil and Resource Engineering and Centre for Water Resources Studies, Dalhousie University, Nova Scotia, Canada
Presenting Author
Armita Motamedi, 1Department of Civil and Resource Engineering and Centre for Water Resources Studies, Dalhousie University, Nova Scotia, Canada