Mapping spatial and temporal pattern of risk and hazard of dust storms in Khuzestan province

Document Type : Research Paper

Authors

1 Assistant Professor, Forests and Rangelands Research Department, Khuzestan Agricultural and Natural Resources Research and Education Center, Agricultural Research Education and Extension Organization (AREEO), Ahvaz, Iran

2 Soil Conservation and Watershed Management Research Department, Lorestan Agricultural and Natural Resources Research and Education Center, Agricultural Research Education and Extension Organization (AREEO), Khorramabad, Iran

3 Associate Professor, Forests and Rangelands Research Department, Khuzestan Agricultural and Natural Resources Research and Education Center, Agricultural Research Education and Extension Organization (AREEO), Ahvaz, Iran

10.29252/aridbiom.2024.21433.2007

Abstract

This research has been conducted in Khuzestan Province covering an area of approximately 64057 square kilometers, over a 28 year time (1995- 2022) period and with the aim of evaluating the spatiotemporal pattern of risk and generating a risk map for dust storms. The utilized data includes hourly measurements from the ground stations (8 time slots within 24 hours). Different models were fitted to the empirical change patterns for spatial variations, and the model with minimum RMSE was selected. Subsequently, using this selected model, interpolation was performed with various neighborhood approaches, resulting in a large number of maps. These maps were converted into a cellular grid network within a GIS environment. Each cell was considered as a zone for calculating the computations related to the risk map. Then the information related to the class of exposed elements, the vulnerability class of elements, and the hazard class were separately applied in each cell. Finally, by calculating the risk equation, a cell-based risk map was obtained. The significant difference in areas was tested using the Chi-squared test. The results of the annual study on the phenomenon of dust storms have shown that the Abadan region has the highest average frequency of 18 days per year, this is the highest number of days observed in the entire study area. 61.11% of regional dust events occur between 9:30 am and 6:30 pm local time, and 81.35% of localized dust storm events occur at 3:30 am. Furthermore, the percentage distribution of regional and extra- regional dust storms during the statistical period indicates that 78.81% of dust storm days originated from extra- regional sources, while 21.19% originated from regional sources. The spatial distribution pattern of the dust storm intensity hazard map exhibits a “moderate clustering” and follows a specific order. The area percentage of risk classes shows that more than 88% of the area in Khuzestan province is in high and very high risk classes, which is one of the reasons related to the larger population in these areas.

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Main Subjects

References

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Journal of Arid Biome
Volume 14, Issue 1
March 2024
Pages 61-78

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