International Telecommunication Union-Radiocommunication Sector P.837-6 and P.837-7 performance to estimate Indonesian rainfall

Marzuki Marzuki, Dea Kurnia Harysandi, Rini Oktaviani, Lisna Meylani, Mutya Vonnisa, Harmadi Harmadi, Hiroyuki Hashiguchi, Toyoshi Shimomai, L. Luini, Sugeng Nugroho, Muzirwan Muzirwan, Nor Azlan Mohd Aris

Abstract


This work evaluated the performance of International Telecommunication Union-Radiocommunication Sector (ITU-R) P.837-6 and P.837-7 models (Annex 1) to estimate one-minute rainfall rates in Indonesia. In addition to the default ITU-R P.837-6, the input of ITU-R P.837-6 is also modified using data which has better spatial resolution, i.e. a combination of Tropical Rainfall Measuring Mission (TRMM) 3A25 and 3B43 (ITU-R+3A25+3B43), 3B42 and 3B43 (ITU-R+3B42+3B43), Global Satellite Mapping of Precipitation (ITU-R+GSMaP), and Global Precipitation Measurement (ITU-R+GPM). Among the five test sites, the default ITU-R P.837-6 and ITU-R+3A25+3B43 could predict one-minute rainfall rates at two locations accurately. The ITU-R P.837-7 exhibited a marginally better performance for sites that had a high percentage of very heavy rain, particularly at large (1%) and small (0.001%) percentages of time exceeded. The spatial distribution of rainfall rate produced by ITU-R P.837-7 and ITU-R+3A25+3B43 was closer to the pattern demonstrated by recent satellite precipitation measurements.

Keywords


Indonesia; ITU-R P.837-6; ITU-R P.837-7; rainfall rate;

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DOI: http://dx.doi.org/10.12928/telkomnika.v18i5.14316

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