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Technische Universität Dresden (2010)

Analysis of Flash Flood Routing by Means of 1D - Hydraulic Modelling

Zerisenay Tesfay Abraha

Titre : Analysis of Flash Flood Routing by Means of 1D - Hydraulic Modelling

Auteur : Zerisenay Tesfay Abraha

Université de soutenance : Technische Universität Dresden

Grade : MSc Degree of Hydro Science and Engineering 2010

This study was conducted at the mountainous catchment part of Batinah Region of the Sultanate of Oman called Al-Awabi watershed which is about 260km2 in area with about 40 Km long Wadi main channel. The study paper presents a proposed modeling approach and possible scenario analysis which uses 1D - hydraulic modeling for flood routing analysis ; and the main tasks of this study work are (1) Model setup for Al-Awabi watershed area, (2) Sensitivity Analysis, and (3) Scenario Analysis on impacts of rainfall characteristics and transmission losses. The model was set for the lower 24 Km long of Al-Awabi main channel (Figure 13). Channel cross-sections were the main input to the 1D-Hydraulic Model used for the analysis of flash flood routing of the Al-Awabi watershed. As field measurements of the Wadi channel cross-sections are labor intensive and expensive activities, availability of measured channel cross-sections is barely found in this study area region of Batinah, Oman ; thereby making it difficult to simulate the flood water level and discharge using MIKE 11 HD. Hence, a methodology for extracting the channel cross-sections from ASTER DEM (27mX27m) and Google Earth map were used in this study area. The performance of the model setup was assessed so as to simulate the flash flood routing analysis at different cross-sections of the modeled reach. And from this study, although there were major gap and problems in data as well as in the prevailing topography, slope and other Hydro Dynamic parameters, it was concluded that the 1D-Hydraulic Modelling utilized for flood routing analysis work can be applied for the Al-Awabi watershed. And from the simulated model results, it was observed that the model was sensitive to the type of Boundary Condition chosen and taken, channel cross sections and its roughness coefficient utilized throughout the model reach.

Mots clés  : Hochwasserablaufberechnung, 1-D-Hydraulikmodell, Sensitivitätsanalyse, Szenarioanalyse, Al Awabi, Oman — Flash Flood Routing, 1D-Hydraulic Model (MIKE 11 HD), Sensitivity Analysis, Scenario Analysis, Al-Awabi watershed, Oman

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Page publiée le 8 janvier 2016, mise à jour le 19 janvier 2018