Investigation of Geomorphological characteristics and causes of Sinkholes in Abarkuh plain

Authors

10.22052/deej.2018.7.21.51

Abstract

Introduction: One of the most important evidence of karst development is the existence of Devlin or sinkholes. Devlin is a natural depression in the karstic areas with internal or subcutaneous drainage. In recent years several genetic classifications have been published for sinkholes sink holes in these categories into two main groups sinkholes of "liquidation" and "depression" are segregated. The sinkholes are closed pits that form holes in the surface of calcareous and other soluble or alluvial soils, and generally runoff from the hole in the floor to groundwater Joins.
materials and methods: The study area with an area of 3714.43 km2 is part of the Abarkuh-Sirjan desert catchment area. Karsts of the region play a major role in the hydrology of the region, but because of the karst cavities in the area adjacent to alluvium, and with the maturation of the karsts, as well as the decrease of the surface area of the area, the internal pressure of the cavities was reduced and the gradual subsidence Alluvial layers are provided. Several cases of sinkholes and longitudinal gaps have also been observed in this area. The areas of occurrence of these hazards can be summarized as follows.
30 sinkholes in the study area. Abarkuh sinkholes on the plains can be divided into sinkholes and sinkhole mountainous desert divided. These halls are different in terms of shape, dimensions, structure, geomorphology
Result: AHP model proposed measures are incompatible with a rate of 09/0 for the presence of soluble layers deep with standard weight of 30%, sediment texture (the sinkhole plain) and limestone formations (sinkholes mountain in ) with a weight of 4.20 percent, down from 4.17 percent weight aquifers, irrigation system with a weight of 12.6% and standard user type, distance from the well of operation, distance from the old stream and fault by weight, respectively, 1/7, 8/5, 6/3, 1/3 were prioritized. Abarkuh plain is based on hydrograph of the underground water unit during the long period of 35 years, during the years 1360 to 1395, equal to 19.64 m (0.56 m per year), Investigation of the drilling log of some piezometers around plain sinkholes showed that the major part of the thickness of the saturated layers of these piezometers was micro-clay and silty granular materials, which in different horizons and limited thicknesses, granular materials Along with sand and The sand is also of different proportions and the stone floor is from calcareous marl .The amounts of chlorine, calcium and magnesium, carbonate and bicarbonate, lime, EC, TDS, PH, volumetric elastic modulus were measured in both fossils. The reason for these experiments is to determine the degree of solubility of the soil and sediments within the hollows. High amounts of lime percent, TDS and carbonates in the soil indicate relatively high solubility in the soils of the study area.
Discussion and Conclusion: The texture is very fine-grained sediments sinkhole plain and with a high percentage of clay content, lime and minerals to pump water from depths to agricultural use leads to dissolution and the resulting sinkhole plain holes as well as the location of sinkholes Abarkuh upstream mountain aquifer, which in recent decades has faced with a sharp drop in the aquifer, the crisis of falling into sinkholes and limestone formations mountainous phenomenon has created.

Keywords

References

1. Aliari, A., 2001. The study of the mechanism of the formation of Hamadan sinkholes. second conference of Engineering Geology and Environment of Iran, pp. 693-703. 2. Alipour, M., Malek Mohamadi, B., Jafari, H., 2016. Land submarine risk zoning due to groundwater abatement using fuzzy hierarchy analysis model. Journal of Watershed management science 11 (38), 25-35. 3. Amiri, M.,2005. Relationship between Sinkholes of Famenin-Kabudrahang Ghahavand Plain and the bed rock of the area. Journal of Earth sciences.11 (58), 134-147. 4. Asgharpour, M., 2009. Application of multi-criteria decision making. Tehran, Iran 5. Bazrafkan AS, Mohammadifar A A, Ekhtesasi MR. 2014. Book of Application of Group Decision-Making Models in Natural Resources Management, Shiraz. Waiting Room, 52 pp. 6. Biglou, J., Moghimi A., Safari, F., 2011. The use of tail in the morphotectonic analysis of the karstic ferrochoids of the Prao-Bisotun masses. Geography Magazine and Environmental Planning. 22 7. Fathizadeh H, Alipour H, Hasheminasab N, Karimi H. 2016. Potentiality of groundwater through a hierarchical analysis process using remote sensing and geographic information system in the Mahdishahr basin, Hydrogeology Journal 8 (3), 1–20. (In Persian) 8. Ghodsim Pour, H., 2006. Analytical Hierarchy Process AHP. Amir Kabir University of Technology Publishing Center. 9. Gunay, G., 2002. Gypsum karst, sivas, Turkey. Environmental Geology, v.42, pp.387-398. 10. Hatef, A, Ekhtesasi, MR., 2016. Groundwater potentiality through Analytic Hierarchy Process using remote sensing and Geographic Information System. Geopersia Journal 6 (1): 75–88. 11. Hoseininezhad, A., Taghdisi, A., Nori, H., Akbarian, R., 2018. Drought Risk Management plan to reduce the vulnerability farmers. Journal of Rural Research. 9 (2). 264-277. 12. Karimi, H., Gerai, P., Tavakoli, M., 2013. The risk of collision enclosure zoning using multivariate regression, Journal of Advanced Applied Geolog (6), 53-62. 13. Matthew, D., Cahalan, M., 2018. Sinkhole formation mechanisms and geostatistical-based prediction analysis in a mantled karst terrain. Journal of Elsevier (165), 333-344. 14. Oh, H., Lee, S., 2010. Assessment of ground subsidence using GIS and the weights-of-evidence model. Engineering Geology (115), 36-48. 15. Omidvar, K., 2011. Natural hazards, Yazd University Press. 16. Raisei Ardakani, A., 2005. Cartilage pits of the incident and its potential in Iran, Proceedings of the conference on the assessment of the dangers of the hollow in the karstic regions. with emphasis on the Hamdan's fountains. West Regional Water Company of Kermanshah, 130-141 17. Sa'ati, Gh., 2004. Techno-technical condition of the downpours of the central plain of Hamedan. "3 th Conference on Engineering and Environmental Geology of Iran, 220-286. 18. Sadati, Gh., 2003. Status tectonicsubsidence pits the central plain of Hamadan. Third conference on Engineering and Environmental geology of Iran. 19. Servati, M., Rostami, M., Nosrati, K., Ahmadi, M., 2013. Identifying the Factors Affecting the Distribution and Event of Shrubs in Kermanshah Gaskarkhani Region Using Logistic Regression 12 (36), 181-194. 20. Waltham, A. C., 1989. Ground subsidence. Blackie. 21. Waltham, A.C., Fookes, P.G., 2005. Engineering classification of karst ground conditions, Speleogenesis and Evolution karst Aquifers 3(1), 1-19. 22. Yazd Regional Water Organization, 2011. Geohydrology study of the Abarkouh plain. (In Persian)
Desert Ecosystem Engineering
Volume 7, Issue 21
February 2019
Pages 91-105

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