Numerical solution to kinematic wave equation for surface runoff analysis using satellite based DEM data

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2020-9

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Yıldırım, Hasan Hüseyin

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Modeling of rainfall runoff over large catchment areas is a critical step in flood analysis to estimate the time-wise variation of discharge at the outlet of hydrological basin. Outlet hydrograph of a basin is generally estimated using empirical formulations based on measurements from previous rainfall events. However, these empirical methods may not correctly model the surface flow dynamics over large and complex geometries. In this study, a fully distributed numerical model is developed that can deal with various flow conditions in natural domains. A structured computational grid is constructed on a Digital Elevation Model (DEM) that is derived from satellite data using appropriate transformations. The numerical algorithm switches between central and up-wind differencing to accurately simulate surface flow, accumulation around barriers and ponding inside cavities. Some numerical anomalies in regions of large bed slope were detected and cure is obtained in the code development stage. The code is optimized for parallel processing in multi-core computers which gives much faster solutions for large domains. Tests on hypothetical and natural domains are performed to validate the developed code.

Subject Keywords

CFD, Kinematic Wave, Rainfall-Runoff, Satellite Based Data

URI

https://hdl.handle.net/11511/69296

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

H. H. Yıldırım, “Numerical solution to kinematic wave equation for surface runoff analysis using satellite based DEM data,” M.S. - Master of Science, Middle East Technical University, 2020.