EGU22-4916, updated on 27 Mar 2022
EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Global Assessment of Compound Risk of High Temperature and Low Streamflow

Rihui An1,2, Pan Liu1, and Xiaogang He2
Rihui An et al.
  • 1School of Water Resources and Hydropower Engineering, Wuhan University, China
  • 2Civil and Environmental Engineering, National University of Singapore, Singapore

In river flowing areas, the co-occurrence of high temperature and low streamflow may cause compound hydrologic hot-dry events (CHHDEs). When thermal and hydrological extremes interact, the impact can be worse than when they occur individually. Evidence shows that CHHDEs have severe socio-economic effects, such as increasing pollutant concentration, endangering aquatic species, and reducing power generation. Despite the importance, large-scale risk quantification of CHHDEs remains rarely studied due to the lack of enough simulated data at the global scale.

Therefore, the objectives of this study are threefold: (1) developing the first global hydrologic hot-dry event dataset from 1901 to 2014 (containing four attributes: duration, intensity, severity, and magnitude) based on a state-of-the-art physically-based Tightly Coupled framework for Hydrology of Open water Interactions in River–lake network (TCHOIR) model, which dynamically simulates thermal and hydrological regimes; (2) developing a robust statistical framework to conduct attribution analysis to identify drivers of compound risk (distinguishing high temperature-driven, low streamflow-driven, and dependence-driven); (3) quantifying the impact of river order and hydrologic belt on compound risk to pinpoint CHHDEs hotspots.

CHHDEs have multi-sectoral impacts, including water availability, food security, and energy production. The compound risk analysis provides crucial insights to maintain regional resilience and guide adaptation strategies.

How to cite: An, R., Liu, P., and He, X.: Global Assessment of Compound Risk of High Temperature and Low Streamflow, EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-4916,, 2022.

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