Fine-Scale Evaluation of Rainfallrnfrom TV-Sats: A New Method for WaterrnMonitoring and Flash Flood Prevention

摘要

In this paper we present a method for rebuildingrnrainfall maps at high resolution (500 m × 500 m, 1 min).rnThis method is based on the assimilation of opportunisticrnmeasurements of the attenuation that aff ects the signalsrncoming from TV satellites in a model of spatiotemporalrnadvection of rainfall fi elds. At the frequencies used (Kurnband), the attenuation aff ecting the signals in the atmospherernis mainly due to rain. We set a sensor (fi eld analyzer) on thernground, and then measured the mean rainfall over the link.rnThis method was applied to a simulated network of sensors.rnThese simulated sensors were realistically set over the Parisrnarea, on a zone assumed to be typical of an area with highrnsocio-economic issues (fl ood prevention, water resourcesrnmanagement). We compared the simulated rainfall mapsrnwith the maps rebuilt by our algorithm. We then showedrnthe feasibility of our approach for measuring the rainfallrnin urban areas with high resolution.