Articles | Volume 21, issue 9
Hydrol. Earth Syst. Sci., 21, 4525–4532, 2017
https://doi.org/10.5194/hess-21-4525-2017
Hydrol. Earth Syst. Sci., 21, 4525–4532, 2017
https://doi.org/10.5194/hess-21-4525-2017

Research article 12 Sep 2017

Research article | 12 Sep 2017

Impact of rainfall spatial aggregation on the identification of debris flow occurrence thresholds

Francesco Marra et al.

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Cited articles

Abancó, C., Hürlimann, M., Moya, J., and Berenguer, M.: Critical Rainfall Conditions for the Initiation of Torrential Flows, Results from the Rebaixader Catchment (Central Pyrenees), J. Hydrol., 541, 218–229, https://doi.org/10.1016/j.jhydrol.2016.01.019, 2016.
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Short summary
Previous studies have reported a systematic underestimation of debris flow occurrence thresholds, due to the use of sparse networks in non-stationary rain fields. We analysed high-resolution radar data to show that spatially aggregated estimates (e.g. satellite data) largely reduce this issue, in light of a reduced estimation variance. Our findings are transferable to other situations in which lower envelope curves are used to predict point-like events in the presence of non-stationary fields.