Spatial Analysis of Environmental Hazards

Spatial Analysis of Environmental Hazards

Simulation of Kaleibar Chai River Changes Using CAESAR Model

Authors
somaiyeh khaleghi
mohammad mahdi hosseinzadeh
payam fatolah atikandi
10.52547/jsaeh.8.2.165
Abstract
River channel changes, bank erosion and sedimentation are the natural processes of the alluvial rivers that destroy the agricultural land and damage to human installations around the river. In the present study, the CAESAR model was used to assess the changes of the Kaleibar Chai River in order to measure the variation of 3 km of its main channel.CAESAR is a cellular automata model for river system evolution. CAESAR is a cellular model that uses a regular mesh of grid cells to represent the river catchment studied. Every cell has properties of elevation, water discharge and depth, vegetation cover, depth to bedrock and grain size. It is based upon the cellular automaton concept, whereby the repeated iteration of a series of rules on each of these cells determines the behaviour of the whole system. CAESAR has a set of rules for a hydrological model, hydraulic model (flow routing), fluvial erosion and deposition and slope erosion and deposition. For every model iteration, cell properties (e.g. elevation) are updated according to the rules, and the interaction between an individual cell and its neighbours. For example, the amount of fluvial erosion in a cell may depend upon the depth of water in the cell and the slope between that cell and its neighbours.

For modeling, the input data such as topography (DEM), daily discharge (year 2012) and sediment grain size were prepared and then channel modifications were simulated. Channel changes were identified before and after the simulation by plotting profiles of each cross-sections and were analyzed sensitive to erosion and sedimentation.Six cross-sections were selected before and after simulation. Results showed that the channel geometry has changed. The width and depth and form of the channel have changed. And only the mean depth of the channels was changed in sections 1, 2, 6 and 4. The erosion was dominated in the cross- sections 1, 2, and 3 (the initial part of the main channel). Then the sedimentation was dominated in the cross- sections 4, 5 and 6.




Keywords
Erosion and sedimentation
CAESAR
Kaleibar Chai River
6. Brierley, G. J., Fryirs, K. 2005. Geomorphology and River Management, Applications of the River Styles Framework. Wiley-Blackwell Publishing, Hoboken, New Jersey, US.
7. Coulthard, T.J.; M.G. Macklin, and M.J. Kirkby. 1996. A cellular automaton fluvial and slope model of landscape evolution. In: R.J. Abrahart (Editor), Proceedings of the 1st International Conference on Geocomputation, University of Leeds, , 17-19 September 1996, Leeds, UK, 168-185.
8. Coulthard, T. J.; M. J. Kirkby and M. G. Macklin. 1998. Non-linearity and spatial resolution in a cellular automaton model of a small upland basin. Hydrology and Earth System Sciences, 2: 257-264.
9. Douvinet, J.; D. Delahaye; P. Langlois. 2007. Use of cellular automata in physical geography. 15th European Colloquium of Theoretical and Quantitative Geography, Montreux : Switzerland.
10. Hancock, G.R; T.J. Coulthard and G.R. Willgoose. 2011. Modelling erosion and channel movement- respose to rainfall variability in South East Australia, 19th international congress on modelling and simulation, 12–16 December, Perth, Australia, 1874-1880.
11. Hancock, G.R; D. Verdon-Kidd and J.B.C. Lowry. 2017. Sediment output from a post-mining catchment – Centennial impacts using stochastically generated rainfall. Journal of Hydrology, 544: 180–194.
12. Gregory, k.j (2006), the Human role in changing River Channels Geomorphology 84, pp277-296.
13. Murray, A.B. and C. A. Paola. 1994. Cellular model of braided rivers. Nature. 371: 54–57.
14. Murray, A.B. and C. Paola. 1997. Properties of a cellular braided stream model. Earth Surface Processes and Landforms, 22: 1001-1025.
15. Nicholas, A.P. 2005. Cellular modelling in fluvial geomorphology. Earth Surface Processes and Landforms, 30: 645-649.
16. Richards, K.S. 1982. Rivers, form and process in alluvial channels. Methuen. New York.
17. River Basin Dynamics and Hydrology Research Group (RBDHRG)., Predictive and investigative modelling of flood hazard in Welsh river catchments, Volume 1, University of Wales, Aberystwyth. 2006.
18. Schumm, S. A., 2005, River Variability and Complexity, First Published, Cambridge
University Press, Published in the United States of America.
19. Van De Wiel, M.J.; T.J. Coulthrd, M.G. Macklin and J. Lewin. 2007. Embedding reach-scale fluvial dynamics within the CAESAR cellular automaton landscape evolution model. Geomorphology , 90: 283-301.
20. Van, Tri P.D.; P.A. Carling, T.J., Coulthard and P. M. Atkinson. 2007. Cellular Automata Approach for Flood Forecasting in a Bifurcation River System. PUBLS. INST. GEOPHYS. POL. ACAD. SC., E-7 (401): 255-260.
21. Wu, Huan, Yi, Yonghong, Chen, Xiuwan..2005. HydroCA: a watershed routing model based on GIS and cellular automata. Proceedings- Spie The International Society for Optical Engineering, VOL 6199, pages 61990Q.
22. Ziliani, L.; N. Surian, T.J. Coulthard and S. Tarantola. 2013. Reduced-complexity modeling of braided rivers: Assessing model performance by sensitivity analysis, calibration, and validation. Journal of Geophysical Research: Earth Surface, 118: 1-20.
Spatial Analysis of Environmental Hazards
Volume 8, Issue 2 - Serial Number 30
Summer 2021
Pages 165-178