MAPPING RAINFALL [ISOHYET] IN AREAS WITH A SHORTAGE OF RAIN STATIONS USING MANUAL STATION TECHNIQUE AND PRECTOTCORR MERRA-2 DATA ANALYSIS

Gunawan  Prayitno; Gerry Novand  Kaunang; Akhmad  Amiruddin Natsir

doi:10.52436/1.jutif.2023.4.4.943

Gunawan Prayitno Informatics Program Study, STMIK PESAT NABIRE, Indonesia
Gerry Novand Kaunang Informatics Program Study, STMIK PESAT NABIRE, Indonesia
Akhmad Amiruddin Natsir Informatics Program Study, STMIK PESAT NABIRE, Indonesia

DOI: https://doi.org/10.52436/1.jutif.2023.4.4.943

Keywords: annual rainfall, IDW, Isohyet method, Kriging, manual station, PRECTOTCORR

Abstract

Rainfall observation data from each rain station in an area is so important to measure the intensity of rainfall in that region. The number of rain stations that are not ideal will affect the process of acquiring rainfall data which is the primary data required for regional rainfall mapping. This study uses the manual station technique and analysis of satellite precipitation data as an alternative aid for mapping annual rainfall with the Isohyet method for areas constrained by a shortage of rain stations like the Nabire Regency area. The purpose of the research was to study the intensity of rainfall in the Nabire Regency area based on data PRECTOTCORR, bias-corrected precipitation by MERRA-2 for the last ten years of precipitation data from 2014-2023 taken from the POWER-NASA climate map and managed through ArcGIS software. The area of Nabire Regency with 12.075,00 km² includes the category of place with high rainfall intensity where the average rainfall ranges from 2000 mm – 5000 mm per year. The results of rainfall mapping with IDW (Inverse Distance Weighting) interpolation and Kriging interpolation show that there are several areas with the highest rainfall, Napan, Siriwo, Kimi, Menou, and Dipa, while the lowest rainfall areas are in the coastal areas, Teluk Umar and the northern region of Wapoga.

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