Application of Real Time Rainfall Data to Inundation Forecasting
Date Issued
2007
Date
2007
Author(s)
Wu, Shu-Wei
DOI
zh-TW
Abstract
The performance of application on the numerical models in inundation simulations was fine in Taiwan, but most of the models made use of the rainfall data from the rain-gauge stations. In this study, the precipitation data was obtained not only from traditional rain-gauge stations but also from the modern precipitation radar which was a progressive detection system in space and time in recent years. By use of QPESUMS ( Quantitative Precipitation Estimation and Segregation Using Multiple Sensors ) , constructed and developed by the Central Weather Bureau, this study arms to predict inundation range and depth in a watershed using the numerical model with the radar precipitation observation system.
The precipitation data with an approximately 1.25km spatial resolution is used for the two-dimensional overland inundation model. The inundation model using 1.2km×1.2km in computational grid and ten minutes in time step provided by QPESUMS calculates immediately so as to predict the possible flooded areas in the watershed. The results can be use for typhoon emergency response.
The research area is the Ba-zhang Creek Basin. The precipitation data from two events, the storm on June 12, 2005 and typhoon Haitang were simulated for model verification. The simulated results from above events were compared with the field observations. These calculations of the inundation simulations can be completed in a short period of time so that the numerical model can be used to predict inundated areas for flood warning in advance.
Subjects
淹水預報
二維漫地流淹水模式
Inundation forecasting
Two-dimensional overland inundation model
QPESUMS
Type
thesis