A Real-time Flood Monitoring Index Based on Daily Effective Precipitation and its Application to Brisbane and Lockyer Valley Flood Events

作者：Deo Ravinesh C^*; Byun Hi Ryong; Adamowski Jan F; Kim Do Woo

来源：Water Resources Management, 2015, 29(11): 4075-4093.

DOI：10.1007/s11269-015-1046-3

• Flood risk
• Flood index
• Brisbane and lockyer valley floods

An objective index for flood monitoring is pragmatic tool for flood early warning systems. This study investigates a novel Flood Index (I-F ) based on Effective Precipitation (P-E ) for quantifying floods in Brisbane and Lockyer Valley. Using daily precipitation (P) data as an input, the I-F was determined by calculating P-E using exponentially-decaying time-reduction function considering gradual depletion of water resources over the passage of time and comparing and normalizing the P-E per day with the means and standard deviations of yearly maximums in the hydrological period. Start of flood was identified for I-F >= 0, severity (I-F (acc) ) assessed by running-sum on consecutively positive I-F , duration (D-F) as number of days with positive I-F and peak danger (I-F(max) ) as maximum I (F) . The ability of I-F for flood warning was verified with river height and discharge rates. The most severe flood was recoded in January 1974 in Brisbane (I (F) (acc) =118, I-F(max) = 4.4, D-F = 104 days) with return period (T) =106.2 years. Next was the December 2010-January 2011 event (I-F (acc) = 61.8, I (F) (max) = 2.6, D-F = 89 days) with T = 53 years. For Lockyer Valley, December 2010-January 2011 was the most severe (T = 104.4 years). Consequently, we advocate the practicality of the daily I (F) for flood risk assessments where severity, peak danger, duration or return periods are to be considered.

• 出版日期2015-9