Land Subsidence Vulnerability Assessment of Rural Settlements in Fars Province
- سال انتشار: 1398
- محل انتشار: فصلنامه پژوهش و برنامه ریزی روستایی، دوره: 8، شماره: 4
- کد COI اختصاصی: JR_RRP-8-4_006
- زبان مقاله: انگلیسی
- تعداد مشاهده: 243
نویسندگان
Shiraz University
Shiraz University
Shiraz University
چکیده
Purpose- Land subsidence is caused by natural factors and human activities around the world. Fars Province, located in the south of Iran, is subject to land subsidence due to the uncontrolled exploitation of groundwater, causing damages to the population and human settlements and also environmental, social and economic areas. Design/methodology/approach- The present research is descriptive in terms of describing land subsidence in the case study region, whereas it is also analytical as time series analysis techniques based on Radar Interferometry (InSAR) is applied to monitor temporal changes in subsidence in Darab and Fasa Plains, including ۴۷۰ rural points. Using ۸ ENVISAT ASAR images spanning between ۲۰۰۵ and ۲۰۱۰, nine Interferograms were processed. In the study area. Geographic Information System (GIS) is then used to study groundwater level decline at the well locations in a ۲۴-year period (from ۱۹۹۱ to ۲۰۱۵). Findings- The results of the research confirm that there is a significant correlation between groundwater water level decline and land surface subsidence. Time series analysis of the processed Interferograms indicate the mean displacement velocity map, demonstrating the maximum subsidence rate of ۲۵ cm/yr. The InSAR analysis reveal within the study area subsidence rate of ۲۵ cm/year in ۲۴ years period and locally exceeding ۳۰ cm/yr in the last decade. This area of significant subsidence is limited in its spatial extent to the agricultural land and is partly influenced by the large-scale over-exploitation of groundwater resources in the region study. The temporal and areal relationships of subsidence and groundwater level data suggest that a significant part of the observed subsidence in the Darab region is caused by intense groundwater extraction which has led to widespread compaction within the upper parts of the up to ۳۰۰m. Socioeconomic analysis and the subsidence hazard map show that ۱۰۵۵۲۳ people are generally at risk of subsidence, of ۶۵۰۶۸ who are at high risk. In addition, there are ۲۶۷۹ socioeconomic infrastructures such as public service at risk of damage by land subsidence. Research limitations/implications- Limitation in In SAR data access, especially for long-term data was one of the main limitations in land subsidence research and also in this research. Practical implications- Integrated water resource management and the observed extraction of groundwater could influence the subsidence rate in the regions exposed to land subsidence. Originality/value- This research will be important to provide vulnerability in regions with groundwater overexploitation.کلیدواژه ها
Vulnerability, land subsidence, Socio-economic consequences, Radar interferometryاطلاعات بیشتر در مورد COI
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