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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Flood risk management and adaptation : The adjustment of c-band radar-rainfall estimates and its impact on stream flow simulation uncertain...
The adjustment of c-band radar-rainfall estimates and its impact on stream flow simulation uncertainty: a case study for jakarta urban river basin, indonesia
The utilization of weather radar has shown the considerable potential for improving the distributed rainfall estimation and
prediction of flood. Ciliwung River in Indonesia (476 km2) has notably contributed to the recurrent flooding in Jakarta. Cband
weather radar is available for providing rain information in Greater Jakarta. Yet, as single polarimetric radar, the
verification of its observation with point rain gauge measurements is indispensable. In this study, the strategies of radarrainfall
calibration and adjustment for extracting radar estimates that is consistent with the ongoing development of realtime
flood prediction in Ciliwung River is designed. Furthermore, the impact of the adjusted radar-rainfall estimates on the
rainfall-runoff simulation is investigated. The radar reflectivity is converted to rainfall intensity by Z-R algorithms. Several
storm events are selected to evaluate the appropriate Z-R relation by minimizing the mean square error between rain
gauges and radar-rainfall in offline scheme. Applying the predefined Z-R relation, the remaining biases in the radar-rainfall
estimates are corrected by using bias adjustment factor method calculated as the ratio between the accumulated rain
gauge rainfall and accumulated radar-rainfall. The rainfall estimates without adjustment, by Marshall-Palmer Z-R
algorithm, calibrated radar-rainfall, and adjusted radar-rainfall are introduced to physically distributed hydrological model in
hourly basis. The simulated runoff is evaluated at Katulampa, Depok, and MT. Haryono points representing upstream,
middle stream, and downstream outlets. Along with these three inputs, the uncertainties of hydrological model parameter
are assessed. Through the calibration process, the algorithm with the lowest error for Ciliwung River basin is obtained.
The analysis reveals that the different radar verification methods account for the variation in the performance of simulated
flood. The results suggest the importance of correction of rainfall estimated from C-band non-polarimetric radar
observation. The proposed framework on radar-rainfall utilization for real-time flood prediction system in Ciliwung River is
also discussed.
File Size : 2,142,528 bytes
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Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Flood risk management and adaptation
Date Published : 19/08/2015
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