Simulation of the water behaviour at the Karaj dam break using numerical methods in GIS environment

Gudarz  Rashno; Mostafa  Ghiyasvand; Ali Akbar  Matkan; Babak  Mirbagheri; Hamid Salehi Shahrabi

Gudarz Rashno M.Sc of RS & GIS, RS and GIS Department, Shahid Beheshti University, Tehran, Iran
Mostafa Ghiyasvand M.Sc of RS & GIS, RS and GIS Department, Shahid Beheshti University, Tehran, Iran
Ali Akbar Matkan Faculty Member of RS and GIS Department, Shahid Beheshti University, Tehran, Iran
Babak Mirbagheri Faculty Member of RS and GIS Department, Shahid Beheshti University, Tehran, Iran
Hamid Salehi Shahrabi M.Sc of RS & GIS, RS and GIS Department, Shahid Beheshti University, Tehran, Iran

Keywords: GIS, Dam failure, Numerical modeling, Finite Volume Method, Approximate Riemann Solver, Karaj dam

Abstract

Dam failure, estimating water velocity and height of wave caused as well as damage caused by the possible failure of dams, have long been of interest to researchers. In order to estimate these parameters, simulation of the failure of the dam is to be studied. The simulation is done by solving the shallow water equations using numerical methods. The method used in this research is HLL, which is written for the first time in. NET programming environment with software components of Arc Objects and its output is analyzed in a GIS environment. Spatial data used in this research includes DEM of Karaj dam reservoir and downstream areas, and also descriptive data on the Manning roughness coefficient, and water level. In this study, a failure of Karaj dam is simulated and downstream areas are zoned in terms of risk of flooding in two scenarios at the same level with the dry and wet bed. The results showed that in the wet downstream bed scenario with a 1770 meter level, the villages Khouzankala and Adrian have been flooded for 11 minutes and 39 seconds. Whereas, in the dry downstream bed scenario with the water level of 1770 m this time reaches 12 minutes and 30 seconds; and it represents more rapid flood for wet bed.

References

Alcrudo F and Mulet J. 2007. Description of the Tous dam break case study (Spain). Journal of Hydraulic Research, 45(sup1): 45-57.

Cameron TA, Avans TA and Brunner GW. 1999. HEC-GeoRAS: Linking GIS to Hydraulic Analysis using ARC/INFO and HEC-RAS. Hydrologic and Hydraulic Modeling Support with Geographic Information System, In Proceedings of the User Conference, San Diego, ESRI Press.

Chen SC, Lin TW and Chen CY. 2015. Modeling of natural dam failure modes and downstream riverbed morphological changes with different dam materials in a flume test. Engineering Geology, 188: 148-518.

[ESRI] Environmental Systems Research Institute. 1999. ArcView GIS Extensions. Internet site, HEC Geo RAS (User's Manual). 2000. US Army Corps of Engineers. Hydrologic-Engineering Center.

Mata J, Leitão NS, de Castro AT and da Costa JS. 2014. Construction of decision rules for early detection of a developing concrete arch dam failure scenario-A discriminant approach. Computers and Structures, 142: 45-53.

Nadim A. 2015. Interface Capturing Schemes for Free-Surface Flows. Encyclopedia of Microfluidics and Nanofluidics. 1418-1428.

Namin M, Lin B and Falconer RA. 2004. Modelling estuarine and coastal flows using an unstructured triangular finite volume algorithm. Advances in Water Resources, 27(12): 1179-1197.

Viseu T and de Almeida AB. 2009. Dam-break risk management and hazard mitigation. WIT Transactions on State-of-the-art in Science and Engineering, Volume 36, 211-239 p.