Utilization of Environmental Risk Indices for Site Selection in the Construction of River Floodwalls in Southern Kerman Province

Articles in Press

Document Type : Original Article

Authors

1 Former M.Sc. Student, Department of Environment, Faculty of Natural Resources, University of Zabol, ‎Zabol, Iran

2 Associate Professor , Department of Environment, Faculty of Natural Resources, University of Zabol, Zabol, Iran

3 Assistant Professor of Environmental Sciences, Faculty of Natural Resources and Environment, University of Birjand, Birjand, Iran

4 Assistant Professor, Department of Environment, Faculty of Natural Resources, University of Zabol, Zabol, Iran

Abstract

The increasing frequency and severity of flood hazards in recent years have necessitated greater attention to the strategic implementation of both biological and physical flood control measures. This study focuses on physical interventions, specifically river floodwalls, as a short-term solution to mitigate flood damage. The study area encompasses the southern region of Kerman Province, including the seven counties of Faryab, Kohnoorj, Jiroft, Manujan, Anbarabad, Qaleh Ganj, and Rudbar Jonoob, which are predominantly high-risk zones for river overflow-induced flooding. To determine optimal sites for river floodwall construction, environmental risk indices were employed, comprising two key layers: flood hazard and flood susceptibility. The flood hazard assessment incorporated ecological criteria, including water availability (precipitation and runoff accumulation), permeability (surface roughness, soil type, and NDVI), and landform characteristics (slope). Meanwhile, socio-economic flood susceptibility was evaluated based on proximity to transportation networks, residential areas, tourist sites, and agricultural land. The criteria for flood hazard indices were standardized, and a hierarchical weighting method was applied. The hazard indices were calculated by combining the ecological criteria using the linear weighted combination (WLC) method. The resultant flood hazard index was then intersected with each socio-economic susceptibility criterion to identify high-risk and vulnerable areas for each category. The findings reveal that 56% of agricultural land and 48% of built-up areas fall within flood risk zones. Moreover, 24% of the transportation network lies in these zones, while none of the assessed tourist sites are situated within high-risk areas. Additionally, 182 kilometers of the province’s rivers-accounting for 2% of the total river length—were identified as requiring floodwall construction to mitigate risks in sensitive socio-economic zones. The outcomes of this study provide valuable insights for decision-makers aiming to reduce environmental and socio-economic damages caused by floods. Furthermore, the methodology employed offers a replicable framework for similar studies in other regions.

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Main Subjects

References

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Journal of Natural Environmental Hazards

Articles in Press, Accepted Manuscript
Available Online from 01 January 2025

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  • Receive Date: 22 June 2024
  • Revise Date: 10 December 2024
  • Accept Date: 01 January 2025

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