Flash Flood Management Approach for Flood Risk Areas Using Numerical Climate Modeling Data Analysis

Abstract

The present study measures management of flash flood to avoid the devastating impacts on boro rice production at Sunamganj district. This study interacts for meteorological parameter assessment with global climate data. Three major climatic parameters (precipitation, temperature and cloud fraction) have been considered for this study. These three climatic data were analyzed using numerical software EdGCM for the period 1920 to 2020 and then downscaled by Transform software. Flash floods have been classified as general flash floods and devastating flash flood. Flash floods have been reported to be severe in March and April. A trend was evaluated for the detection of flash flooding occurrences. The study concludes that when temperature is high, a small amount of rainfall can cause a slight cloud fraction to cause flooding. Flash flooding occurs when temperature is above 76oF(24.44oC), rainfall is at least 3 mm and cloud fraction is at most 46%. Furthermore, for validation Mann-Kendall trend analysis have been done. The test result discovered increasing trend for rainfall and decreasing trend for temperature and cloud fraction. Finally, an algorithm was developed in C++ program as a flash flood precaution tool which helped to prepare strategy as well as to adapt with the flash flood.

Using Multi-index Model to Assess the Risk From Flash Flood: a Geospatial Approach on Sunamganj Haor (Wetland) Region, Bangladesh

“…These districts contain about 373 Haors, covering an area of about 85,900 ha (859 km 2 ), or about 43% of Bangladesh's total Haor zone (CEGIS, 2012) and 23 transboundary rivers have been identi ed that ow from India (Hossain et al, 2008). The maximum topography of Haor region is largely at with maximum land surface elevation less than 10 meters.…”

“…A ash ood is a hydrological event that occurs within a few hours of heavy rain, rapid snowmelt, a sudden glacial lake outburst, embankment failure, or the rapid break up of an ice block due to rapid temperature rise (Hossain et al, 2008). Flash ood usually happens in small areas.…”

Flash flood potential risk zone identification by using GIS-based spatial multi-index model: A case study of Sunamganj District (Wetland), Bangladesh

“…Sunamganj, Habiganj, Netrokona, Kishoreganj, Sylhet, Moulavibazar and Brahmanbaria are the seven districts that make up the core northeast Haor area, which spans 1.99 million ha area and 19.37 million people (CEGIS, 2012). These districts contain about 373 Haors, covering an area of about 85,900 ha (859 km 2 ), or about 43% of Bangladesh's total Haor zone (CEGIS, 2012) and 23 transboundary rivers have been identified that flow from India (Hossain et al, 2008). The maximum topography of Haor region is largely flat with maximum land surface elevation less than 10 meters.…”

“…A flash flood is a hydrological event that occurs within a few hours of heavy rain, rapid snowmelt, a sudden glacial lake outburst, embankment failure, or the rapid break up of an ice block due to rapid temperature rise (Hossain et al, 2008). Flash flood usually happens in small areas.…”