EXTREME PRECIPITATION ANALYZED FROM MERGED RAIN GAUGE AND SATELLITE PRECIPITATION DATA IN CENTRAL JAVA-INDONESIA

• Main Authors: , Andung Bayu Sekaranom, , Prof. Dr. rer. nat. Muh Aris Marfai, M.Sc.
• Format: Theses and Dissertations NonPeerReviewed
• Published: [Yogyakarta] : Universitas Gadjah Mada 2013
• Subjects: ETD
• Online Access: https://repository.ugm.ac.id/127510/; http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=67768
• Institution: Universitas Gadjah Mada

This research aims to 1) evaluate precipitation data from satellite estimates and develop a daily rain gauge and satellite merging precipitation data, 2) identify the spatial distribution of extreme precipitations based on merged rain gauge-satellite precipitation data, and 3) identify the spatial distribution of flood susceptibility in Central Java based on extreme precipitation distribution and land surface characteristics. Daily precipitation data from 1998-2010 were obtained from rain gauge stations from BMKG, while satellite estimates were obtained from TRMM 3B42. The data were merged using based on data assimilation technique using successive corrections method. Extreme precipitation identification taken by precipitation threshold, return period rainfall, and probable maximum precipitation (PMP). The merging technique produces improved precipitation data from the study area, especially in replacing missing daily data and area with low station density. The results indicate that extreme precipitation occurs mainly in the low lands and coastal areas. Moreover, extreme precipitation is in line with highly susceptible area, especially in Tegal, Pekalongan, Kendal, Semarang, Demak, Purworejo, Kebumen, Kutoarjo, Gombong, and Cilacap.