Investigation of Environmental Changes around Hoze-Soltan Lake Using Meteorological Data and Remote Sensing techniques

Subject Areas : Air Pollution

Elham Forootan ¹ , Marzieh Alikhah Asl ²

1 - Assistant Professor, Department of Agriculture and National Resorces, Payame Noor University (PNU), Qom, Iran. *(Corresponding Authors)
2 - Assistant Professor, Department of Agriculture and National Resorces, Payame Noor University (PNU), Tehran, Iran

Received: 1970-01-01 Accepted : 1970-01-01 Published : 1970-01-01

Keywords: Hoze-Soltan lake, Qom, Water level, MNDWI, NDVI,

Abstract :

Background and Objective: Investigation of environmental changes is a necessity for maintenance and optimized utilization of natural resources. For this purpose, field measurements and region sampling, which are time-consuming and expensive, are implemented. Method: In this study, precipitation, temperature and water level variations were investigated in the study area and evapotranspiration rates were calculated using Blanney-Criddle method. Moreover, remote sensing techniques such as Normalized Difference Vegetation Index (NDVI) and water index, MNDWI, were used to investigate the environmental changes. The study area is located around Hoze Soltan Salt Lake beside Tehran-Qom highway. The Landsat ETM satellite images of 2002 and OLI of 2013 in May were prepared to be used in this study. Findings: Using MNDWI, the Hoze-Soltan Lake area were estimated as 7835.857 and 6265.062 hectare in 2002 and 2013, respectively, indicating the reduction of lake area in 2013. NDVI index revealed that vegetation cover increased from 65.33 hectare in 2002 to 2942.61 hectare in 2013. Moreover; investigation of rainfall volume, temperature, evapotranspiration and water level using the available data revealed a declining trend of rainfall volume and water level and an increasing trend of temperature and evapotranspiration in the region. Discussion and Conclusion: The results of this study indicated that some parts of the region around Hoze-Soltan lake were not inundated in 2013 because of the decreased water level. This has provided a good growth condition for more plants and for cultivation in some parts. The increase of vegetation covers and consequently the increase of evapotranspiration along with water level withdraw and precipitation declining trend emphasize the reduction of lake area during the study period as presented by the remote sensing techniques. 

References:

Reference

1. Alavi Panah. Sayed Kazem,2004. Application of Remote Sensing in Earth Sciences (Soil Science). Tehran University Press.

2. Sepehri. Adel and Fathi. Mohammad Reza, 2008, Application of Landsat TM Satellite Data in Estimating Soybean Dry Crop in Protected Rangelands of Jahanaman, Journal of Agricultural Science and Natural Resources, Vol. 8, No. 1.


3. Khaje Din. Seyed Jamaloddin, 1996, Use of satellite data of MSS- 5 Landsat in studying plant communities and determination of saline lands in Jazmurian region, Second National Conference on Desertification and Different Methods of Desertification, Kerman.


4. Alavi Panah. Sayed Kazem and Rafiei Imam, Amar, 2004, Comparison of vegetative indices based on each thermal band with indices derived from reflection band in ground source studies, geomechanical congress.


5. Torahi, A.A., Chand Rai, S. Land Cover Classification and Forest Change Analysis, Using Satellite Imagery-A Case Study in Dehdez Area of Zagros Mountain in Iran, Journal of Geographic Information System, 3,1-11. 2011 .


6. Prem Chandra,J. Performance evaluation of vegetation indices using remotely sensed data, International Journal  Of  Geomatics And Geosciences, Vol.2, N.1. 2011 . 


7. Ahmed  M, Al-Khafaji  A. Assessment Environmental Changes in Al-Habbaniya Lake and Surrounding Areas in the Central Part of Iraq, Journal of Natural Sciences Research, Vol.3, No.4, 8-15. 2013.


8. Rokni,K., Ahmad.A., Selamat.A., Hazini.Sh. Water Feature Extraction and Change Detection Using Multitemporal Landsat Imagery. 6, 4173-4189pp. 2014. doi:10.3390/rs6054173


9. Rouse, J. W., Hass, R. H., Schell, J. A and Deering, D. W. Monitoring vegetation systems in the great plains with the ERTS, Proceeding, third ERTS symposium Vol. 1. Pp. 48-62. 1973


10. Xu, H. Modification of normalised difference water index (NDWI) to enhance open water features in remotely sensed imagery. Int. J. Remote Sens. 27, 3025–3033.2006.


11. Mehdi Nia Mojtaba, 2010, Introduction of Tourism Area of Lake Hoze- Soltan Qom. http://www.mehrmg.ir


12. Kakayi Kazem, 2007, Estimation of Ecological Capacity of Lake Hoze- Soltan (for extraction of salt from the lake), Master thesis, Department of Environmental Management, Islamic Azad University, 90Pp.

 

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