Evaluation of Desertification based on  climate and water criteria (Case study: Kashan plain)

Masoudi, Reyhaneh; Zehtabian, Gholamreza; Ahmadi, Hassan; Khalighi Sigarudi, Shahram

doi:10.22059/jrwm.2015.56953

Evaluation of Desertification based on climate and water criteria (Case study: Kashan plain)

Document Type : Research Paper

Authors

Reyhaneh Masoudi ¹

Gholamreza Zehtabian ²

Hassan Ahmadi ³

Shahram Khalighi sigarudi ⁴

¹ P h.D. Candidate in Combating Desertification, Faculty of Natural Resources, University of Tehran, Iran.

² Professor, Faculty of Natural Resources, University of Tehran, Iran

³ Professor. Islamic Azad university

⁴ Associate professor, Faculty of Natural Resources, University of Tehran, Iran

https://doi.org/10.22059/jrwm.2015.56953

Abstract

Desertification is a major problem in many countries. International efforts have been considered to combat and prevent this phenomenon. The most important cases of these measures are the United Nations Convention to Combat Desertification. In this study, IMDPA model and GIS were used to assess desertification phenomena in Kashan Plain. Some indices of Climate and water criteria were selected to consider for each condition of the region. Final desertification intensity was calculated based on geometric average of the selected criteria and their indices. The numerical value was classified in 5 classes including non-significant, low, medium, severe and very severe and desertification intensity map was drawn using GIS in the studied period. According to the results, among the studied indices, the groundwater level depletion, EC and Transu aridity index with 3/82, 3/04 and 3/01 numerical values are the most effective factors. The threshold of ground water level, EC and Transu aridity index were determined respectively: more than50 cm/year, 2250-5000((μmohs)⁄(cm)) and 0/05-0/2. Also, the case study has classified in medium class of desertification with DS=2/4. Regarding the determined thresholds were specified the sensitive areas, and the required equipment are proposed to install on these areas for observing the thresholds.

Keywords

Desertification

IMDPA model

Kashan

Criterion

indices

threshold

[1] Abdi, J. (2007). Assessment and mapping of desertification condition using IMDPA model with emphasis on water and soil, (case study: Abuzeidabad), M.Sc thesis, Faculty of Natural Resources, University of Tehran.

[2] Ahmadi, H. (2004). The final report describes the formulation of a comprehensive service plan and methodology specifying the evaluation criteria and indicators of desertification in Iran, Faculty of Natural Resources, University of Tehran.

[3] Ekhtesasi, M.R. and Mohajeri, S. (1995). Classification and methods of desertification intensity in Iran, Proceedings of the 2th National Conference of desertification and desertification methods, Department of Construction Jahad Ministry of Education and Research, Research Institute of Forest, Rangeland and Watershed, Kerman, Iran.

[4] European commission (1999). Mediterranean Desertifiaction Land Use (MEDALUSE), MEDALUSE office.

[5] FAO\UNEP (1984). Provisional methodology for assessment and mapping of desertification, food and agriculture organization of the United Nations, United Nations Environmental Program, Rome, 73.

[6] Jahanshahi, A., Moghadamnia, A. R. and Khosravi, H. (2015). Assessment of desertification intensity using IMDPA model (Case study: Shahr Babak Plain, Kerman Province), Journal of Range and Watershed, 68(2), 247-267.

[7] Khosravi, H. (2005). Application of MEDALUS model in desertification of Kashan, M.Sc thesis, Faculty of Natural Resources University of Tehran.

[8] Mesbahzade, T. (2007). Evaluation and mapping of desertification condition using IMDPA model with emphasis on Land criteria (Case study: Abuzeidabad), M.Sc thesis, Faculty of Natural Resources, University of Tehran.

[9] Tabatabaeefar, S.M., Zehtabian, Gh.R., Rahimi, M., Khosravi, H. and Nikoo, Sh. (2013). The impact assessment of temporal variation of climatological and groundwater condition on desertification intensity in Garmsar Plain, Journal of Desert Management, 2, 39-48.

[10] Vesali, A. (2008). Biophysics indices of desertification intensity affected by human activities (study area: Kashan, Aran and Bidgol), M.Sc thesis, Faculty of Natural Resources, University of Tehran.

[11] Zehtabian, Gh. R., Khosravi, H. and Masoudi, R. (2014). Models of desertification assessment (Criteria and Indices), 1th edition, and university of Tehran press.

[12] Zehtabian, Gh., Ahmadi, H., Ekhtessassi, M.R. and Jafari, R. (2003). Intensity Determination of Wind Erosion in Kashan Area by the Desertification Mode FAO- UNEP and ICD, Iranian Journal of Natural Resources, 55(2), 145-158.