An investigation on the mechanism of land subsidence in the northwest of mashhad city, NE Iran
Journal Title: Journal of Biodiversity and Environmental Sciences (JBES) - Year 2014, Vol 5, Issue 3
Abstract
Mashhad city is located in Mashhad Plain in the northeast of Iran. Mashhad plain is one of the most important plain in Khorasan Razavi province. In the last decades, rapid population growth coupled with agricultural expansion has tremendously increased pressure on the groundwater resources in the plain. Large increases in water demand with little recharge have strained the plain groundwater resources resulting with 65 m drawdown of water levels in the past 40 years in some part of the plain. Due to declining of the groundwater levels, digging new wells has been forbidden since 1965. As a result of dropping in groundwater levels, land subsidence appears in some parts of the region. For example, intensive dropping of groundwater level has created cracks and fractures on the land and buildings in Tous area in the northwest of the city. This paper deals with declining of groundwater level and mechanism of land subsidence in this part of the plain. Based on land subsidence data available from Tous permanent GPS stations, the annual rate of land subsidence was measured about 20 cm/yr. This rate of land subsidence is confirmed with the results was obtained by the InSAR(Interferometric Synthetic Aperture Radar) method. The results show that land subsidence in the study area is due to compaction of clay beds (Aquitard layers) within the aquifer systems as a result of a decrease in pore-fluid pressure (ground water decline) and resultant increase in effective stress.
Authors and Affiliations
Gholam Reza Lashkaripour, Mohammad Ghafoori, Mohammad Mosavi Maddah
Keywords
Related Articles
- EP ID EP37946
- DOI -
- Views 135
- Downloads 0
Water self-purification processes in mond river (mond protected area, Iran)
In order to this research he samples from the selected water points were taken during 6 months (July to December 2012). Totally 10 parameters were tested. These are temperature, dissolved oxygen (DO), pH, EC, COD, NO3,...
Florıstıc bıodıversıty and tradıtıonal uses of medıcınal plants of haramosh valley central karakoram natıonal park of gılgıt dıstrıct, Gılgıt-Baltıstan, Pakıstan
The aim of present study was to explore the floristic inventory and record the indiginious knowledge about medicinal plants of the Haramosh valley, Central karakoram national Park.For this purpose, surveys were carried...
An analysis of household waste prevention behaviours (case study: Fereidan Township)
Environmental problems such as, urban garbage and produce Waste in urban areas are the results of human behavior. Only change in human behavior can reduce these environmental problems. Thus studying attitude and behavi...
Evaluation of Drinking Water Quality in Urban Areas of Pakistan. A Case Study of Gulshan-e-Iqbal Karachi, Pakistan
A study was carried out to evaluate the quality of water supplied by Water and Sanitation Agency (WASA), Karachi. Gulshan-e-IQbal was selected for this purpose. Water samples from different source (12 houses) connections...
Evaluating groundwater pollution and assessing the vulnerability. Case of massive dune of Bouteldja, Algeria
The applicability of DRASTI vulnerability assessment method in evaluating the impact of agricultural activities on groundwater quality is tested in many areas in the north of Algeria with modest results. Intensive agricu...