dc.contributor.author	Alahmadi, Fahad Salim
dc.date.accessioned	2024-07-23T01:34:37Z
dc.date.available	2024-07-23T01:34:37Z
dc.date.issued	2016
dc.description	Thesis (PhD. (Civil Engineering))
dc.description.abstract	In the last decade, Saudi Arabia faced many urban flash flood disasters in the most populated areas. Unfortunately, in arid regions flash flood phenomenon has yet to be fully understood and still poorly documented. Wadi Bathan in Almadinah Almunawwarah was selected for flood modeling study. It’s an urban arid ungauged catchment with its lithology mostly composed of fractured volcanic rocks. The main objective of this study was to predict the extreme rainfall pattern and simulate flood inundation using hydrodynamic model. The R software was used to predict the extreme rainfall for different return periods by frequency analysis using nine probability distribution functions (PDFs). The predicted design storms were subsequently used in HEC-HMS software to produce simulated hydrographs. Three methods of excess rainfall estimation (SCS curve number, initial constant rate and Green-Ampt) were applied and two synthetic Unit Hydrograph (UH) methods (SCS dimensionless unit hydrograph and Clark unit hydrograph) were compared. The extreme resultant hydrographs were selected in flood hydrodynamic modeling using Infowork-ICM software to generate the flood mapping characteristics and LiDAR data was used to represent the detailed topographic features. Pearson type III PDF provided the best fit for Peak over Threshold (POT) data series. The estimated 100 year rainfall depths are 128.6 mm and 83.5 mm for station M001 and station M103, respectively. SCS-CN loss method is more appropriate for computing excess rainfall on volcanic rocks, where the SCS-CN is 78. However, both synthetic UH methods yield comparable results. The simulated peak discharge ranges from 27.3 m3/sec to 412.7 m3/sec, and the runoff depth from 16.7 mm to 131.9 mm. The flood inundation maps showed at least two vulnerable flood prone areas near the downstream with maximum flood depth from 1.45 m to 2.63 m, and the flow velocity from 3.2 m/sec to 5.25 m/sec. The finding also revealed that flood modeling of arid ungauged fractured volcanic catchment was more complex since the runoff did not behave like Hortonian flow
dc.description.sponsorship	Faculty of Civil Engineering
dc.identifier.uri	http://openscience.utm.my/handle/123456789/1267
dc.language.iso	en
dc.publisher	Universiti Teknologi Malaysia
dc.subject	Arid regions—Research
dc.subject	Rainfall anomalies
dc.subject	Flood routing
dc.title	Flood modeling of ungauged arid volcanic environment of Wadi Bathan in Almadinah
dc.type	Thesis
dc.type	Dataset

Flood modeling of ungauged arid volcanic environment of Wadi Bathan in Almadinah

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