2D Flood Simulation Using the Nays 2D Flood Model and Comparison with the Sentinel 2 Satellite Image (Case Study: Flood of March 2019 at the end of Arazkuse River, Golestan Province)

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BAHREMAND A.; JAMALI F.; KOMAKI CH.B.

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Journal: Journal of Water and Soil Conservation Year:2020 | Volume:27 | Issue:2 Page(s): 223-236

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Title

2D Flood Simulation Using the Nays 2D Flood Model and Comparison with the Sentinel 2 Satellite Image (Case Study: Flood of March 2019 at the end of Arazkuse River, Golestan Province)

Author(s)

BAHREMAND A. | JAMALI F. | KOMAKI CH.B. | Issue Writer Certificate

Keywords

Golestan Province flooding of March 2019Q1

Nays 2D FloodQ1

Sentinel 2 imageryQ1

Two-dimensional flood hydraulic simulationQ1

Abstract

Background and Objectives: Flooding occurrence with rare return periods in most regions of the country and its harmful human and financial effects, which are intensifying often due to human actions, has brought the issue of flood management under more attention. Numerous numerical models have been developed to simulate flooding. These hydraulic models are three types, i. e., one-dimensional, two-dimensional and three-dimensional. Due to the fact that it is necessary to simulate inundation accurately with low cost, a two-dimensional horizontal hydraulic model called Nays 2D Flood was used in the present study. Materials and Methods: The model was used for simulating flood in Arazkuse river reach before joining the Gorganrood River for the event occurred on March 20, 2019, as this phenomenon is one of the rare floods for the region. For this purpose, a DEM with one meter resolution and flood hourly hydrograph were given to the model. Then an appropriate grid was determined and the roughness of the channel and flood plain were mapped using the Google Earth images in the model software environment. Results: The results of this simulation include maps of depth and flood zone and flow rate. The results were evaluated by computing the F coefficient and comparing the area calculated by the model with the images recorded by Sentinel 2 satellite on the same date. The F statistic was calculated 0. 78 in the present study. This number indicates that there is an acceptable match between the area calculated by the model and the area observed by the satellite. The flooded area is 13. 95ha in the satellite image, while the simulated area was estimated 14. 30ha by the model. To evaluate the results, also the depths from rating curve data were used to compare with the simulated depths. The depth calculated by the model is 6. 22 m on 5 April 2019. At that date, the depth of water was observed according to the rating curve measuring 6. 63 meters. The error rate in this evaluation was calculated 6. 18%. Conclusion: These results suggest that the Nays 2D Flood model has an acceptable function and it can also be used in future researches. Since the flood movement in a flood plain is in length and width, the two-dimensional models that take into account this fact are preferred to the one-dimensional models. The results of this study and similar researches indicate the good accuracy of these models in simulating the flood zone outside the river channel. Having a high resolution DEM, the model can be used successfully without channel sections’ data when the flood has spread out of the channel bed.

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APA: Copy

BAHREMAND, A., JAMALI, F., & KOMAKI, CH.B.. (2020). 2D Flood Simulation Using the Nays 2D Flood Model and Comparison with the Sentinel 2 Satellite Image (Case Study: Flood of March 2019 at the end of Arazkuse River, Golestan Province). JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES), 27(2 ), 223-236. SID. https://sid.ir/paper/407163/en

Vancouver: Copy

BAHREMAND A., JAMALI F., KOMAKI CH.B.. 2D Flood Simulation Using the Nays 2D Flood Model and Comparison with the Sentinel 2 Satellite Image (Case Study: Flood of March 2019 at the end of Arazkuse River, Golestan Province). JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES)[Internet]. 2020;27(2 ):223-236. Available from: https://sid.ir/paper/407163/en

IEEE: Copy

A. BAHREMAND, F. JAMALI, and CH.B. KOMAKI, “2D Flood Simulation Using the Nays 2D Flood Model and Comparison with the Sentinel 2 Satellite Image (Case Study: Flood of March 2019 at the end of Arazkuse River, Golestan Province),” JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES), vol. 27, no. 2 , pp. 223–236, 2020, [Online]. Available: https://sid.ir/paper/407163/en

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