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Discussion papers | Copyright
https://doi.org/10.5194/acp-2017-963
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 06 Dec 2017

Research article | 06 Dec 2017

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This discussion paper is a preprint. It has been under review for the journal Atmospheric Chemistry and Physics (ACP). The revised manuscript was not accepted.

On the Use of Measurements from a Commercial Microwave Link for Evaluation of Flash Floods in Arid Regions

Adam Eshel1, Hagit Messer2, Jonatan Ostrometzky2, Roi Raich2, Pinhas Alpert1, and Jonathan B. Laronne3 Adam Eshel et al.
  • 1Department of Geophysics, Tel Aviv University, Tel Aviv, Israel
  • 2School of Electrical Engineering, Tel Aviv University, Tel Aviv, Israel
  • 3Department of Geography and Environmental Development, Ben Gurion University, Beer Sheva, Israel

Abstract. Flash flood warning in deserts is a challenging task, and local rain bursts are of high significance. In the last decade, commercial microwave telecommunication links have been shown to be a valuable tool for near ground rainfall estimations. Dense networks are used for highly accurate rainfall estimates, while isolated links, typical in rural areas, can detect the existence of near-ground rainfall. However, the induced attenuation of the signal integrates the rainfall along a line, therefore high local rain intensities are smoothed. In this paper, we propose a novel method that uses the integration of measurements from an isolated long microwave link with measurements from weather radar to identify potential conditions for flash floods. In particular, we suggest using radar measurements to indicate the rain variability (spottiness) along a 16km long link, crossing Wadi Ze'elim catchment (245km2), using kurtosis as a spottiness index. Quantitative ground level rainfall measurements are then provided by the link. When compared with analyzed discharge, inverse kurtosis-rain rate relation is associated with flash flood responses in Wadi Ze'elim, an ephemeral Wadi located in the Dead Sea.

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Adam Eshel et al.
Adam Eshel et al.
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The power of a signal between two telecommunication (cellular) towers weakens when rain falls in the medium. Through which, accurate rain intensity at ground level in remote areas can be derived. This unique database, together with weather radar data was used to show the feasibility of its integration into short-term flash flood warning in arid areas, a challenging task using traditional means. Commercial towers are widely spread sensors and were therefore used opportunistically.
The power of a signal between two telecommunication (cellular) towers weakens when rain falls...
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