Effiect of map scale and grid size for hydrological modelling

Date

2003-09-19

Author

Usul, Nurunnisa
Pasaogullari, Onur

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

113
views

0
downloads

GIS is a very useful tool in modelling the earth surface and defining basin parameters to be used in topography-based hydrological modelling. Grid based Digital Elevation Model (DEM) is used for modelling topography and grid size is the main parameter that will affect the accuracy of DEM directly and hydrological modelling indirectly. The objective of this study was to examine the effect of grid size and map scale on geomorphological basin parameters. The study was conducted on three small research basins in central Anatolia, Turkey, for which these parameters were determined and analysed with different grid sizes and different map scales. The grid operations: surface modelling, flow direction, sinks, filling sinks, flow accumulation, basin delineation, stream network, ordering and vector conversion were made with a GRID module of Are/Info software. It was found that as grid size decreases more detail can be observed, but this is true for steeper areas. Also, as the basin area increases, the effect of grid size increases. Considering the map scale, grid size selection is a tradeoff between the accuracy needed and computation time.

Subject Keywords

GIS, Grid size effect, Map scale effect, Hydrology

URI

https://hdl.handle.net/11511/53038

Conference Name

International Conference of GIS Remote Sensing in Hydrology, Water Resources and Environment

Collections

Department of Civil Engineering, Conference / Seminar

Suggestions

OpenMETU
Core

Numerical simulation of rainfall-induced landslides considering hysteresis and scanning soil-water characteristic curves Kenanoğlu, Melih Birhan; Toker, Nabi Kartal (2017-05-11) Infiltration through unsaturated soil is essential issue in the modelling of rainfall-induced landslides, Hysteresis in soil-water characteristic curves complicates the modelling of infiltration. This study aims to establish a numerical model for rainfall infiltration and ultimate limit state stability of an unsaturated infinite slope, while considering the effect of wetting-drying hysteresis.
Linear mixed model with Laplace distribution (LLMM) Gökalp Yavuz, Fulya (2018-03-01) Linear mixed modeling (LMM) is a comprehensive technique used for clustered, panel and longitudinal data. The main assumption of classical LMM is having normally distributed random effects and error terms. However, there are several situations for that we need to use heavier tails distributions than the (multivariate) normal to handle outliers and/or heavy tailness in data. In this study, we focus on LMM using the multivariate Laplace distribution which is known as the heavy tailed alternative to the normal...
3D Planar Representation of Stereo Depth Images for 3DTV Applications Ozkalayci, Burak O.; Alatan, Abdullah Aydın (2014-12-01) The depth modality of the multiview video plus depth (MVD) format is an active research area, whose main objective is to develop depth image based rendering friendly efficient compression methods. As a part of this research, a novel 3D planar-based depth representation is proposed. The planar approximation of multiple depth images are formulated as an energy-based co-segmentation problem by a Markov random field model. The energy terms of this problem are designed to mimic the rate-distortion tradeoff for a...
Numerical simulation of groundwater contamination Ger, M; Baran, Özgür Uğraş; Irfanoglu, B (2000-06-14) In this study, the finite difference modeling technique is used to develop a simulation program that can be used for groundwater contamination problems. The simulation program is written in C++ programming language and runs on personal computers using Windows 95. The simulation program supplies an interactive user interface containing useful tools for pre-processing and postprocessing the data. Numerical models are capable of simulating two-dimensional areal aquifer systems with various conditions. Finite d...
Cartesian Grid Mapper: Transformation Media for Modeling Arbitrary Curved Boundaries With Cartesian Grids ÖZGÜN, ÖZLEM; Kuzuoğlu, Mustafa (2014-01-01) A transformation electromagnetics-based approach is presented to facilitate the use of fixed Cartesian grids for modeling arbitrarily shaped (convex or nonconvex) curved boundaries in finite methods. The basic idea is to design transformation media adapted to the Cartesian grid by using the duality between the material parameters of the media and the coordinate transformation that maps the points of the Cartesian grid to the points on the original curved boundary. Such a transformation medium is named Carte...

Citation Formats

N. Usul and O. Pasaogullari, “Effiect of map scale and grid size for hydrological modelling,” Sandouping, PEOPLES R CHINA, 2003, vol. 289, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/53038.