Flood risk potential zoning in Lamard Energy Industries Special Economic Zone

Subject Areas : WATER RESOURCES

Marzieh Mogholi ¹

1 - Associate Professor, Department of Geography, Larestan Branch, Islamic Azad University, Larestan, Iran

Received: 2022-11-21 Accepted : 2023-08-14 Published : 2023-06-21

Keywords: HEC-RAS model, : Flood, special economic zone, Energy Industries, Lamard,

Abstract :

River flooding is one of the most important environmental hazards that can lead to damage and destruction. The purpose of this research is to investigate the flood site of the special economic zone of energy industries on Lamard using the HEC-RAS model and the geographic information system and prepare a digital map of the area to simulate the river and the TIN model of the river. By extracting the geometric characteristics of the river in the GIS environment, other necessary characteristics such as Manning's coefficient and design flood discharge are introduced to the HEC-RAS model for hydraulic simulation and flood zone determination. At this stage, by specifying the location of the transverse sections on the prepared plans, the water level for each transverse section is specified on the plan map, then according to the longitudinal slope of the river in each area and by interpolating the number between the two sections, The amount of water was transferred on the maps. Finally, according to the amount of water in the main level of the river, the flood zones for discharge with certain return periods were determined.. Considering the importance of the Manning coefficient in the hydraulic simulation of the flow The sensitivity of the model to this coefficient has been investigated for floods with different return periods (200, 50, 10 years). Based on the above information, the changes in average flow speed, average water depth and average width of the water surface for decreasing or increasing the initial Manning coefficient have been calculated in natural conditions. The results show that with a 20% decrease in the Manning coefficient, the flow speed for floods with The return period of 200, 50, and 10 years increases by about 2.3%, 2.2%, and 1.3%, respectively. . In relation to the changes in the width of the water level with a 20% increase in Manning's coefficient, these changes for floods with a return period of 200, 50, and 10 years are respectively 3.4, 3.6, 3.8. The percentage is increasing. Then, using the map of the flood zones, the flood control of the site of the special economic zone of energy industries was carried out on Lamard. The results of the present research will indicate the ability to integrate the spatial information system with the HEC-RAS hydrological model in simulating the change in the behavior of rivers in relation to the expansion of cities.

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