Development of a flood inundation model for extreme flood analysis

A devastating flood disaster occurred at Kuala Krai, Kelantan on December 2014. The flood disaster had given a significant destructive impact on the infrastructure and as a result, almost 1,600 homes were lost or destroyed. This extreme flood event killed 25 villages and forced 45,467 people in Kuala Krai, Kelantan to be evacuated from their homes. Continuous heavy rain for over three days from the 21st to the 23rd of December, 2014 was set a rainfall record of 1,295 mm, equivalent to the amount of rain usually seen in a span of 64 days. As a result, the water levels of three major rivers, the Sungai Galas in Dabong, the Sungai Lebir in Tualang and the Sungai Kelantan in Jambatan Gueillemard, rose above the dangerous water levels. It is essential to estimate the extent of flood inundation. The objective of this study is to simulate flood event in December 2014 by using HEC-HMS. The results show the peak discharges and inundations occurred approximately on the 25th December 2014; 18,575.7 m3/s to be almost similar magnitude as reported by DID 2014 Flood Report. These findings led to the conclusion that the HEC-HMS model is useful as a flood analysis tool.

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Impact assessment of upstream flooding on extreme flood frequency analysis by incorporating a flood-inundation model for flood risk assessment

Journal of Hydrology ◽

10.1016/j.jhydrol.2017.09.012 ◽

2017 ◽

Vol 554 ◽

pp. 370-382 ◽

Cited By ~ 20

Author(s):

Tomohiro Tanaka ◽

Yasuto Tachikawa ◽

Yutaka Ichikawa ◽

Kazuaki Yorozu

Keyword(s):

Risk Assessment ◽

Impact Assessment ◽

Frequency Analysis ◽

Flood Risk ◽

Flood Frequency ◽

Flood Frequency Analysis ◽

Flood Inundation ◽

Flood Risk Assessment ◽

Extreme Flood ◽

Inundation Model

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Benchmarking of a 2D flood inundation model implemented in a GPU environment

Comprehensive Flood Risk Management ◽

10.1201/b13715-75 ◽

2012 ◽

Author(s):

Sergiy Vorogushyn ◽

Dung Nguyen ◽

Daniela Falter ◽

Heiko Apel

Keyword(s):

Flood Inundation ◽

Inundation Model

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Can the re-infiltration process be ignored for flood inundation mapping and prediction during extreme storms?

10.22541/au.163255068.80748935/v1 ◽

2021 ◽

Author(s):

Zhi Li ◽

Mengye Chen ◽

Shang Gao ◽

Berry Wen ◽

Jonathan Gourley ◽

...

Keyword(s):

Model Performance ◽

High Water ◽

Public Access ◽

Subsurface Water ◽

Flood Inundation ◽

Infiltration Process ◽

Antecedent Soil Moisture ◽

Flood Depth ◽

Extreme Flood ◽

Inundation Mapping

Coupled Hydrologic & Hydraulic (H&H) models have been widely applied to simulate both discharge and flood inundation due to their complementary advantages, yet the H&H models oftentimes suffer from one-way and weak coupling and particularly disregarded run-on infiltration or re-infiltration. This could compromise the model accuracy, such as under-prediction (over-prediction) of subsurface water contents (surface runoff). In this study, we examine the H&H model performance differences between the scenarios with and without re-infiltration process in extreme events¬ – 100-year design rainfall and 500-year Hurricane Harvey event – from the perspective of flood depth, inundation extent, and timing. Results from both events underline that re-infiltration manifests discernable impacts and non-negligible differences for better predicting flood depth and extents, flood wave timings, and inundation durations. Saturated hydraulic conductivity and antecedent soil moisture are found to be the prime contributors to such differences. For the Hurricane Harvey event, the model performance is verified against stream gauges and high water marks, from which the re-infiltration scheme increases the Nash Sutcliffe Efficiency score by 140% on average and reduces maximum depth differences by 17%. This study highlights that the re-infiltration process should not be disregarded even in extreme flood simulations. Meanwhile, the new version of the H&H model – the Coupled Routing and Excess STorage inundation MApping and Prediction (CREST-iMAP) Version 1.1, which incorporates such two-way coupling and re-infiltration scheme, is released for public access.

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