Monitoring Changes in the Wind Regime and Trend of Sand Drift Potential in Iran’s Southeastern Coastal Deserts (Konarak-Chabahar)

Document Type : Original Article

Author

Department of Nature Engineering and Medicinal Plants, Faculty of Agriculture, University of Torbat Heydarieh, Torbat Heydarieh, Iran.

‎10.22052/deej.2024.254657.1050

Abstract

Introduction: Wind erosion is a phenomenon that involves various complex factors that are not yet fully comprehended. Its study requires knowledge of multiple disciplines, including atmospheric sciences, fluid dynamics, soil science, environmental and agricultural science, and land management. The desert areas of Iran are geographically classified into two general categories: internal and coastal deserts. However, Iran's coastal deserts, which are spread as an east-west strip from Gwatar Bay to Khuzestan, have been under-researched. Considering the importance of the wind regime in the coastal areas, this study set out to evaluate the trend of sand drift potential changes in southeastern Iran.
 
Materials and Methods: Initially, the wind data collected from the Chabahar and Konark synoptic stations were processed and prepared for further analysis. According to Fryberger's studies, the wind erosion threshold equals 12 knots. Moreover, WR Plot and MATLAB software were used to perform relevant analyses. Also, standard wind speed classes were used to calculate sand drift potential using the Fryberger method. Finally, the trend of the changes was evaluated using the Mann-Kendall and Sen's slope statistical tests.
 
Results: The average wind speeds in Chabahar and Konarak synoptic stations were found to be 6.05 and 5.01 knots, respectively. Furthermore, the evaluation results of calm wind percentage revealed that Konarak station enjoyed a higher frequency than Chabahar. Also, the annual calm wind percentage in the Chabahar and Konarak synoptic stations was reported as 19.83% and 47.95%, respectively. Based on the annual scale, the southeast (15.55%), the west (13.64%) in Chabahar, and the southwest (11.57%) and south (11.27%) had the highest direction abundance in Konarak. On the other hand, the investigation of the seasonal wind regime indicated that southwest and west winds were more frequent in winter and spring in Chabahar and Konark, respectively. However, the highest frequency of southeast and southern winds occurred during the summer and autumn in both regions, respectively. Moreover, the results of annual sand drift potential showed that the occurrence of sand drift potential was more likely in Konarak than in Chabahar. In addition, the sand drift potential is directed towards the northeast in both regions, indicating the greater significant influence of coastal winds that blow from the Oman Sea towards these two areas. Furthermore, the results of non-parametric statistical tests such as Mann–Kendall and Sens slope which were performed to assess the trend of changes in sand drift potential suggested that according to both statistical tests, in all the studied months, the trend of changes was negative in Chabahar and positive in Konarak. On the other hand, the analysis of trend findings revealed that the sand drift potential was significant in Chabahar and Konarak at 99% and 90%, respectively.
 
Discussion and Conclusion: The investigation of the wind regime’s frequency in the study area indicated the dominance of southeast, south, southwest, and west winds on an annual scale. Also, seasonal changes were observed in the Chabahar and Konarak due to the nature of the coastal winds blowing there. It was also found that while southeast winds blew more frequently during the summer, southwest and west winds were more frequent throughout other seasons. In a study on the southeastern coast of Iran, the significance of wind erosion has been emphasized, considering the fact that wind erosion processes constitute one of the main factors involved in changing coastlines. Over time, the inconsistency of air and dryness has brought about significant consequences, causing the sand dunes to move. The findings of this study are consistent with other studies conducted on the wind regime of the Oman Sea’s coasts. As mentioned in other studies, this region is affected by two types of wind regimes: 1) western winds and 2) monsoon winds blowing from the south and southwest. In similar studies carried out in the Iranian coastal areas, including the coast of Jask, sea-to-shore winds (anabatic) have been found to have contributed more critically to forming sand dunes than land-to-sea (katabatic) winds. In the current study, the statistical analysis of the changing trend in Chabahar indicated a negative trend which was totally different from the positive trend found in Konarak. What was mentioned above may be regarded as the origin of the wind regime formation in Chabahar and Konarak.
Several studies have found that changes in air pressure gradient cause changes in wind speed, being able to affect erosion processes in coastal areas. In a study conducted in the Northern Hemisphere, the general trend of wind speed was negative from 1980 to 2016, which is consistent with the results found in the current study for Chabahar. Another similar study reported that the western regions of Pakistan were affected by a positive trend in wind speed, arguing that the decrease in soil moisture in the western areas of Pakistan over time has altered the wind regime of those areas. Therefore, due to the proximity of Konarak to the western part of Pakistan, these areas may possess a similar positive trend, as mentioned in the results of the current study. As mentioned in similar studies, if relevant governmental officials do not set appropriate plans for combating wind erosion, the phenomenon may bring about harmful consequences for human societies, transportation, etc. Moreover, there is an urgent and necessary need to study wind erosion processes in different regions of the world, including coastal areas. One of the main limitations of this study was the lack of data on wind speed and wind direction at a short time scale (for instance, minutes). Therefore, it is recommended that a more detailed study be conducted in this regard. Wind measuring stations should also be established and operated along the coasts of southeastern Iran. Finally, it is suggested that satellite images taken during the long-term period be used to perform a more precise analysis of the anemometer data in the region and to investigate their influence on the formation of sand dunes, seeking to obtain more accurate information concerning the movement direction and speed of coastal sand dunes.

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  1. Ahmadi, H. (2012). Applied geomorphology (wind erosion). Tehran University Press.
  2. Ahrariroudi, M., Moussavi Harami, S. R., Lak, R., Motamed, A., & Mahboubi, A. (2012). Sedimentology environmental assessment of the Makran coastal region of Iran. Journal geotechnical geology, 7(4), 289-298.
  3. Akbarpoor Bonab, B., Hanifehpour, M., Biabani, L., & Khosravi, H., 2022. Characteristics of Wind Regime and Sand Transport Potential in Coastal Hills (Case Study: Jask). Quarterly journal of Environmental Erosion Research, 47(3), 212-230.
  4. Al-Awadhi, J. M., Al-Helal, A., & Al-Enezi, A. (2005). Sand drift potential in the desert of Kuwait. Journal of arid environments63(2), 425-438.
  5. Bacopoulos, P., & Clark, R. R. (2021). Coastal erosion and structural damage due to four consecutive-year major hurricanes: Beach projects afford resilience and coastal protection. Ocean & Coastal Management, 209, 105643.
  6. Bakker, M. M., Govers, G., Jones, R. A., & Rounsevell, M. D. (2007). The effect of soil erosion on Europe’s crop yields. Ecosystems10, 1209-1219.
  7. Flor-Blanco, G., Alcántara-Carrió, J., Jackson, D. W. T., Flor, G., & Flores-Soriano, C. (2021). Coastal erosion in NW Spain: Recent patterns under extreme storm wave Geomorphology, 387, 107767.
  8. Fryberger, S. G. (1979). Dune forms and wind regime. McKee, E.D. (Ed.), a Study of Global Sand Seas. U.S. Geological Survey, Professional Paper, the United States of America, Washington pp. 137–169.
  9. Gharibreza, M. (2016). Evolutionary trend of paleoshorelines in the Coastal Makran zone (Southeast Iran) since the mid-Holocene. Quaternary International392, 203-212.
  10. Hereher, M. E. (2014). Assessment of sand drift potential along the Nile Valley and Delta using climatic and satellite data. Applied Geography, 55, 39-47.
  11. Hereher, M., Al-Buloshi, A., Sherief, Y., Al-Awadhi, T., Al-Hatrushi, S., Charabi, Y., & Assal, E. (2020). Formation of the Wahiba Sand Sea in the Sultanate of Oman: implications of change in wind energy. Arabian Journal of Geosciences, 13, 1-14.
  12. Jadgal, M. (2016). Granulometric survey and anemometer data to evaluate the morphology of coastal sand dunes in Kanarak. Sc. Thesis, University of Saravan, Faculty of Natural Resources, Saravan, Iran.
  13. Jewell, P. W., & Nicoll, K. (2011). Wind regimes and aeolian transport in the Great Basin, USA. Geomorphology129(1-2), 1-13.
  14. Kendall, M. G. (1956). Rank Correlation Methods. Griffin. England:
  15. Laurila, T. K., Sinclair, V. A., & Gregow, H. (2021). Climatology, variability, and trends in near‐surface wind speeds over the North Atlantic and Europe during 1979–2018 based on ERA5. International Journal of Climatology41(4), 2253-2278.
  16. Layeghi, B., Ghader, S., Ali Akbari Bidokhti, A., & Azadi, M. (2017). Sensitivity of WRF model simulations to physical parameterization over the Persian Gulf and Oman Sea during summer monsoon. Iranian Journal of Geophysics, 11(1): 1-20.
  17. Livingstone, I. (2020). Geomorphological significance of wind flow patterns over a Namib linear dune. In Aeolian geomorphology, Routledge.
  18. Ma, B., Gao, L., Cheng, J., Ding, B., Ding, L., Qu, L., & An, Y. (2022). Characteristics and Hazards of an Aeolian Sand Environment along Railways in the Southeastern Fringe of the Taklimakan Desert and Sand Control Measures. Applied Sciences, 12(18), 9186.
  19. Maghsoudi, M., Nejad Hosseini, R., & Gholami, F. (2023), Analysis of Erosive Winds and investigating Wind Sediment Carrying Capacity in sabulous Sandy Regions of Khuzestan Province. Quarterly journal of Environmental Erosion Research, 50(2), 1-24.
  20. Mann, H. B. (1945). Nonparametric tests against trend. Journal of the econometric society, 13(3), 245-259.
  21. Miao, H., Dong, D., Huang, G., Hu, K., Tian, Q., & Gong, Y. (2020). Evaluation of Northern Hemisphere surface wind speed and wind power density in multiple reanalysis datasets. Energy, 200, 117382.
  22. Nazari Samani, A. A., Khosravi, H., Mesbahzadeh, T., & Rahdari, M. R. (2016). Investigate of Wind Regime and Sand Drift Potential in Order to Identify of Sand Dunes Forms. Watershed management researches, 29(111), 19-33.
  23. ParsaPoor, R. (2013). Persian Gulf Science and Technology Park http://www.pgstp.ir/uploads/PGSTP_English _trans-1.png
  24. Pearce, K. I., & Walker, I. J. (2005). Frequency and magnitude biases in the ‘Fryberger’model, with implications for characterizing geomorphically effective winds. Geomorphology68(1-2), 39-55.
  25. Rahdari, G. R., Rahdari, M. R., Fakhireh, A. A., Shahryari, A. R., & Khosravi, H. (2013). GIS-based Monitoring and EWSs of Desertification (Case study; southeastern of Iran). International Journal of Advanced Biological and Biomedical Research, 1(10), 1185-1198.
  26. Rahdari, M. R., Caballero-Calvo, A., Kharazmi, R., & Rodrigo-Comino, J. (2023). Evaluating temporal sand drift potential trends in the Sistan region, Southeast Iran. Environmental Science and Pollution Research, 30(57), 120266-120283.
  27. Refahi, H. (2012). Wind erosion and control. Tehran University Press.
  28. Shao, Y. (2008). Physics and modelling of wind erosion. Dordrecht: Springer Netherlands.
  29. Shao, Y., Jung, E., & Leslie, L. M. (2002). Numerical prediction of northeast Asian dust storms using an integrated wind erosion modeling system. Journal of Geophysical Research: Atmospheres107(D24), AAC-21.
  30. Ullah, I., Ma, X., Yin, J., Saleem, F., Syed, S., Omer, A., & Arshad, M. (2022). Observed changes in seasonal drought characteristics and their possible potential drivers over Pakistan. International journal of climatology, 42(3), 1576-1596.
  31. Yan, B., Chan, P. W., Li, Q. S., He, Y. C., & Shu, Z. R. (2020). Characterising the fractal dimension of wind speed time series under different terrain conditions. Journal of Wind Engineering and Industrial Aerodynamics, 201, 104165.
  32. Zamani, S., Mahmoodabadi, M., Yazdanpanah, N., Farpoor, M., H. (2019). Wind Erosion Potential of Kerman Province using Seasonal Analysis of Wind Rose and Sand Rose. Journal of Water and Soil, 33(1): 83-101.
  33. Zareian Jahromi, M., 2008. Morphodynamic study of sand dunes in southern Iran (Case study: Sedij Jask area). M.Sc. Thesis, University of Tehran, Faculty of Natural Resources, Karaj, Iran.
  34. Zhang, H., Ge, M., Liu, Y., & Yang, X. I., (2021). A new coupled model for the equivalent roughness heights of wind farms. Renewable Energy, 171, 34-46.