Investigation of flood risk zoning in Mazandaran province in GIS environment (Case study: Babolrood watershed)
Subject Areas : Applications in natural hazard and disaster
Karim
Solaimani
1
(RS & GIS)
Behrooz
Mohseni
2
(Assistant Professor Payamnoor University)
Keywords: Babolrood, Flooding, runoff, rainfall, zoning,
Abstract :
The purpose of this study is to create up-to-date and accurate flood risk maps in the Babolrood watershed using synoptic station data and physiographic information. The flood potential was then modeled using GIS, satellite imagery, and layer integration. The final flood risk map was prepared based on a combination of factors, climatic and physical elements coefficient, and rainfall intensity. The results of flood risk zoning showed that sub-basin B2 has a higher score than other basins and has a higher flood potential with the scoring method under the same conditions. Sub-basins B11121, B211INT, B11121INT, and B211 were then identified in the next priorities in terms of flooding, respectively. Finally, based on the flood intensity index method, sub-basins B11121, B211INT, and B1INT with the highest flood coefficient were identified as the most flood sub-basins. By increasing the percentage of vegetation canopy in the tributaries of the basin and based on the flood potential zoning map, a significant part of rainwater runoff can be controlled and absorbed in the same place. The results show that part of the basin is affected by the risk of floods with very high potential, which is mainly located downstream and leading to the sea at the outlet of the basin. Networks ranked 3 and 4 are known as flood zones and flood control areas to the downstream areas. River networks with a rank of 5 and above are located in the area of floodplains or rivers downstream and usually have surface and extensive floods. Also, in some areas, which have a relatively high altitude, due to the snowfall of the basin, the number of runoff increases and causes flooding in the area. Therefore, monitoring the withdrawal of river loan resources and constructions (change of use) are among the priority proposals in this basin.
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