A comparison of flash flood response at two different watersheds in Grenada, Caribbean Islands

R. A. Pratomo, V. Jetten, D. Alkema

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Grenada is one of the susceptible areas to flooding. It is due to the high intensity of rainfall in each year and Grenada often hit by hurricanes and tropical storms. Flash-flood often occur in Grenada, specifically in two areas (Gouyave and St. John's watershed). Both of them have different characteristics. Gouyave watershed represents rural area, whereas St. John's watershed is an urban area. This paper aims to understand the flash-flood response of Gouyave and St. John's watershed in different return periods. It is emphasized that urbanization is an important factor related to flash-flood. This paper uses quantitative methods with flood modelling using OpenLISEM software. Input data to develop flood modelling are DEM (Digital Elevation Model), saturated hydraulic conductivity (Ksat), initial soil moisture, surface roughness (Manning's n), and random roughness. The result shows that St. John's watershed is more sensitive and has higher response to flash-flood than Gouyave. St. John's watershed is more urbanized which decreases water infiltration. So, it increases the potential run-off and flash-flood events become more massive.

Original languageEnglish
Article number012004
JournalIOP conference series: Earth and environmental science
Volume29
Issue number1
DOIs
Publication statusPublished - 19 Jan 2016

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flash flood
watershed
return period
surface roughness
hurricane
modeling
digital elevation model
roughness
comparison
hydraulic conductivity
rural area
urbanization
infiltration
flooding
urban area
soil moisture
runoff
software
rainfall

Cite this

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title = "A comparison of flash flood response at two different watersheds in Grenada, Caribbean Islands",
abstract = "Grenada is one of the susceptible areas to flooding. It is due to the high intensity of rainfall in each year and Grenada often hit by hurricanes and tropical storms. Flash-flood often occur in Grenada, specifically in two areas (Gouyave and St. John's watershed). Both of them have different characteristics. Gouyave watershed represents rural area, whereas St. John's watershed is an urban area. This paper aims to understand the flash-flood response of Gouyave and St. John's watershed in different return periods. It is emphasized that urbanization is an important factor related to flash-flood. This paper uses quantitative methods with flood modelling using OpenLISEM software. Input data to develop flood modelling are DEM (Digital Elevation Model), saturated hydraulic conductivity (Ksat), initial soil moisture, surface roughness (Manning's n), and random roughness. The result shows that St. John's watershed is more sensitive and has higher response to flash-flood than Gouyave. St. John's watershed is more urbanized which decreases water infiltration. So, it increases the potential run-off and flash-flood events become more massive.",
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A comparison of flash flood response at two different watersheds in Grenada, Caribbean Islands. / Pratomo, R. A.; Jetten, V.; Alkema, D.

In: IOP conference series: Earth and environmental science, Vol. 29, No. 1, 012004, 19.01.2016.

Research output: Contribution to journalArticleAcademicpeer-review

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AU - Alkema, D.

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N2 - Grenada is one of the susceptible areas to flooding. It is due to the high intensity of rainfall in each year and Grenada often hit by hurricanes and tropical storms. Flash-flood often occur in Grenada, specifically in two areas (Gouyave and St. John's watershed). Both of them have different characteristics. Gouyave watershed represents rural area, whereas St. John's watershed is an urban area. This paper aims to understand the flash-flood response of Gouyave and St. John's watershed in different return periods. It is emphasized that urbanization is an important factor related to flash-flood. This paper uses quantitative methods with flood modelling using OpenLISEM software. Input data to develop flood modelling are DEM (Digital Elevation Model), saturated hydraulic conductivity (Ksat), initial soil moisture, surface roughness (Manning's n), and random roughness. The result shows that St. John's watershed is more sensitive and has higher response to flash-flood than Gouyave. St. John's watershed is more urbanized which decreases water infiltration. So, it increases the potential run-off and flash-flood events become more massive.

AB - Grenada is one of the susceptible areas to flooding. It is due to the high intensity of rainfall in each year and Grenada often hit by hurricanes and tropical storms. Flash-flood often occur in Grenada, specifically in two areas (Gouyave and St. John's watershed). Both of them have different characteristics. Gouyave watershed represents rural area, whereas St. John's watershed is an urban area. This paper aims to understand the flash-flood response of Gouyave and St. John's watershed in different return periods. It is emphasized that urbanization is an important factor related to flash-flood. This paper uses quantitative methods with flood modelling using OpenLISEM software. Input data to develop flood modelling are DEM (Digital Elevation Model), saturated hydraulic conductivity (Ksat), initial soil moisture, surface roughness (Manning's n), and random roughness. The result shows that St. John's watershed is more sensitive and has higher response to flash-flood than Gouyave. St. John's watershed is more urbanized which decreases water infiltration. So, it increases the potential run-off and flash-flood events become more massive.

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