IDENTIFICATION OF CHANGING IN DIURNAL PATTERN OF RAINFALL IN CASE OF FLOODING IN NORTHERN COASTAL OF WEST JAVA 2014

Documentation regarding events of Jakarta flooding in 2007 and 2013 showed heavy rains occurred in the morning until noon for a couple days on the coastal area. These indicated that the events related to a change in diurnal patterns of rainfall over land. This study was conducted to confirm the changing on diurnal rainfall pattern in the case of flooding in the northern West Java on 17 January 2014 using hourly 3B41RT rainfall data from TRMM satellite. Research results show significant changes in phase and amplitude of diurnal patterns of rainfall occurred on the north coast of West Java during 16-21 January 2014. This change was shown through opposite phase of diurnal rainfall pattern over the north coastal area, which the larger amplitude of maximum rainfall was reached in the early morning. In land, the phase of diurnal rainfall cycle has changed from diurnal to semidiurnal with peaks of rainfall occurs in the mornings and evenings. Genesis of flooding on 17 January along the northern coast of West Java preceded by heavy rainfall persistently which occurred during 18 hours on 16-17 January and it was supposed changed the cycle of diurnal rainfall average during January 2014.