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Quantifying water cover shifts across the globe: following the steps of walking floods
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  • Paula Torre Zaffaroni,
  • Javier Houspanossian,
  • Carlos M Di Bella,
  • Esteban Gabriel Jobbagy
Paula Torre Zaffaroni
Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura

Corresponding Author:[email protected]

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Javier Houspanossian
IMASL - Universidad Nacional de San Luis/CONICET
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Carlos M Di Bella
Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura
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Esteban Gabriel Jobbagy
IMASL - Universidad Nacional de San Luis/CONICET
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Abstract

Floods in ideal landscapes follow a coherent pattern where single water-covered areas expand and afterwards recede following the inverse sequence but deviate in real landscapes, due to natural or human factors, resulting in flood coverage shifts. Using remote sensing, we introduced two indices to describe the discrepancies between spatially integrated vs. pixel-level frequency distributions under maximum flooded conditions (dext) and throughout all flooding conditions (dtot), expressed as the relative weight of shifts on each landscape’s maximum registered coverage, theoretically ranging between no displacement (<20%) to maximum displacement (< < inf). Globally, over 36 years floods 26 exhibited redistributions representing, on average, 25% and 45% of their peak extents 27 revealing previously unnoticed extra flooded areas and rotational movements within flood28 ing events, rising up to 500% in meandering rivers (South America) and irrigated crop29 lands (Central Asia). We also assessed the influence of natural and human variables and 30 discussed the indices’ potential for advancing flood research.
18 Jul 2023Submitted to ESS Open Archive
23 Jul 2023Published in ESS Open Archive