Deciphering the Role of Total Water Storage Anomalies in Mediating Regional Flooding

Author:

Sun Alexander Y.1ORCID,Save Himanshu2ORCID,Rateb Ashraf1ORCID,Jiang Peishi3ORCID,Scanlon Bridget R.1ORCID

Affiliation:

1. Bureau of Economic Geology The University of Texas at Austin Austin TX USA

2. Center for Space Research The University of Texas at Austin Austin TX USA

3. Pacific Northwest National Laboratory Watershed & Ecosystem Science Richland WA USA

Abstract

AbstractRegional floods result from various flood generation mechanisms. Traditional analyses mainly link flooding to extreme rainfall, with limited input from soil moisture. Total water storage (TWS) is a holistic measure of basin wetness, including additional storage components from surface water, snow, and groundwater. Utilizing a new 5‐day Gravity Recovery and Climate Experiment and its Follow On (GRACE(‐FO)) data set, we investigated the linkage between short‐term TWS anomaly (TWSA) and regional flooding. The 5‐day TWSA solutions revealed flood signals missed by monthly TWSA solutions. Global basins exhibit distinct storage‐discharge co‐evolution patterns, offering new insights into flood mechanisms and propensity. Our bivariate event analyses show the annual maximum river discharges co‐occur more often with the TWSA maxima than with precipitation in many basins. Further analyses revealed TWSA's time‐lagged effect on river discharge, particularly in basins susceptible to floods triggered by saturation‐excess runoff. The 5‐day TWSA provides a new source of information for enhancing global flood preparedness.

Funder

Earth Sciences Division

Publisher

American Geophysical Union (AGU)

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