IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 35th IAHR Congress - Chengdu (2013) : THEME 8 - CLIMATE CHANGE AND HAZARD MITIGATION : Numerical Prediction of Heavy Rainfall Using Weather and Research Forecasting Model
Numerical Prediction of Heavy Rainfall Using Weather and Research Forecasting Model
Author : Masato Kita, Yoshihisa Kawahara, Ryota Tsubaki and Tomoki Ushiyama
The increase of heavy rainfall events with global climate change highlights the importance of effective schemes to prevent or mitigate the loss of life and property due to inundation and landslides. The advancement in numerical prediction of heavy rainfall is one of the important measures to give suitable forecast and warning for flood prevention and evacuation activities. This study aims at clarifying the accuracy of a numerical model WRF (Weather and Research Forecasting) coupled with a data assimilation method LETKF (Local Ensemble Transform Kalman Filter). We carried out numerical simulation of heavy rainfall in the northern part of Kyushu Island, Japan, which occurred from July in 2012. Comparison between the calculated hourly rainfall and that measured by a radar system shows that the numerical model can reasonably capture the high mixing ratio and the strong southwest wind over the southern part of Kyushu, which transported moisture to cause the heavy rainfall in the northern Kyushu. It also shows that the prediction without data assimilation fails to reproduce the heavy rain and the southwest wind, which demonstrates the effectiveness of LETKF.
File Size : 575,710 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 35th IAHR Congress - Chengdu (2013)
Date Published : 19/07/2016
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