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- W176361736 abstract "Digital elevation models (DEM) are extensively used in hydrological analysis to obtain the direction of flow on a topographical surface. Knowing the direction of flow helps in determining channel networks, and in obtaining the distributed specific catchments, which are important hydrological attributes in a DEM based analysis. There are certain demerits in the known methods of DEM-based flow-path mapping, despite the ease of handling the DEM in present generation computational capacity. A major demerit is the problem of accounting multidirectional flow path mapping efficiently. In this study, a new approach of assigning the flow direction is proposed. This approach considers the flow as a vector component and argues that the direction of flow can be different from the direction of steepest slope on a planar surface depending on surface roughness and flow vectors. The direction of flow, if assigned to the direction of the maximum flow tendency, gives a better flow path mapping. In this case, the direction is not necessarily restrict either on grid or across diagonal of the grid-centers, which enables to assign the flow direction toward multiple downstream cells. This method is named as the Ranked Flow Tendency (RAFT) method. This method was tested using the DEM of Kamishiiba Reservoir Site (210 km2) as the case. The results show the RAFT method is better than the conventional D8 method and modified D8 method. The RAFT method identifies the network of channels and lakes and can incorporate the flow dispersion properly. These abilities show higher possibility of yielding a better result while used this method in sediment and pollutant flow simulation and water quality modeling." @default.
- W176361736 created "2016-06-24" @default.
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- W176361736 date "2005-01-01" @default.
- W176361736 modified "2023-09-27" @default.
- W176361736 title "DEM Based Multi-Directional Flow Path Mapping Using the Raft Method" @default.
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