A new method is presented for estimating the space-time rainfall intensity distribution at ground level over a limited area. This is based on a tomographic technique that exploits the relationship between microwave attenuation and rainfall intensity. At each time step, the spatial distribution of rainfall intensity is calculated from a set of path-integrated microwave attenuation measurements, performed over the monitored area. A set of bilinear basis functions is used to reconstruct the rainfall space distribution from discrete samples. A recursive optimization technique is applied to solve the ill-conditioned system of linear algebraic equations providing the searched solution at each time stop, thus, obtaining an estimate of space-time distribution of rainfall intensity. This method is analyzed using computer simulated data, and various results are shown that validate the proposed tomographic technique. In particular a rainfall event is simulated over a 20 × 20 km2 plane area, assuming that propagation attenuation measurements be carded out at Ka, band through eight stations (six transmitters and two receivers) displaced inside the same area. Comparisons made with the rainfall-field reconstruction obtained by an equal number of raingage stations located in the same area show the significant improvement of spatial resolution provided by the proposed tomographic technique.

Tomographic Reconstruction of Rainfall Fields through Microwave Attenuation Measurements / D. Giuli;A. Toccafondi;G. Biffi Gentili;A. Freni. - In: JOURNAL OF APPLIED METEOROLOGY. - ISSN 0894-8763. - STAMPA. - 30:(1991), pp. 1323-1340. [10.1175/1520-0450(1991)030<1323:TRORFT>2.0.CO;2]

Tomographic Reconstruction of Rainfall Fields through Microwave Attenuation Measurements

GIULI, DINO;BIFFI GENTILI, GUIDO;FRENI, ANGELO
1991

Abstract

A new method is presented for estimating the space-time rainfall intensity distribution at ground level over a limited area. This is based on a tomographic technique that exploits the relationship between microwave attenuation and rainfall intensity. At each time step, the spatial distribution of rainfall intensity is calculated from a set of path-integrated microwave attenuation measurements, performed over the monitored area. A set of bilinear basis functions is used to reconstruct the rainfall space distribution from discrete samples. A recursive optimization technique is applied to solve the ill-conditioned system of linear algebraic equations providing the searched solution at each time stop, thus, obtaining an estimate of space-time distribution of rainfall intensity. This method is analyzed using computer simulated data, and various results are shown that validate the proposed tomographic technique. In particular a rainfall event is simulated over a 20 × 20 km2 plane area, assuming that propagation attenuation measurements be carded out at Ka, band through eight stations (six transmitters and two receivers) displaced inside the same area. Comparisons made with the rainfall-field reconstruction obtained by an equal number of raingage stations located in the same area show the significant improvement of spatial resolution provided by the proposed tomographic technique.
1991
30
1323
1340
D. Giuli;A. Toccafondi;G. Biffi Gentili;A. Freni
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/780575
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