drought monitoring using vegetation indices and modis data (case study: isfahan province, iran)

نویسندگان

mahtab safari shad

phd student, department of natural resource, university of sari, iran. alireza ildoromi

associate professor, dept of range& watershed management, malayer university iran. davoud akhzari

davoud akhzari, department of watershed and rangeland management, malayer university, malayer 6571995863, iran. e-mail: [email protected], [email protected]

چکیده

drought is a major problematic phenomenon mostly for semi-arid areas of iran. during drought periods, reduction in vegetation levels causes such problems as soil erosion, surface runoff, flood risk, etc. therefore, the assessment of drought effects on plant covers is the most important issue. this research was conducted in 2015 using the extracted vegetation indices from moderate resolution imaging spectroradiometer (modis) sensor data during 2000-2008. in esfahan province, monthly rainfall data from 25 stations were used to derive the standardized precipitation index (spi) at 3 month scale, march to september. spi was used to validate three index results in drought estimation. the result of calculating spi showed that droughts occurred in 2000, 2001 and 2008. the result of pearson correlations between spi and vegetation indices showed thatthe highest correlation was related to vci index and the lowest correlation was related to tci index. the result of ndvi index in 2000, 2001 and 2008 indicated that the poor vegetation cover was increasingly occurred. based on the results of this study, it can be concluded that the ndvi and vci indices concerning modis sensor can be a good alternative for estimating the drought with respect to meteorological indices and consequently can give a better idea on drought conditions in the study area. it was shown that remote sensing data can be practically useful in analyzing the drought events in esfahan province.

برای دانلود باید عضویت طلایی داشته باشید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Drought Monitoring Using Vegetation Indices and MODIS Data (Case Study: Isfahan Province, Iran)

Drought is a major problematic phenomenon mostly for semi-arid areas of Iran. During drought periods, reduction in vegetation levels causes such problems as soil erosion, surface runoff, flood risk, etc. Therefore, the assessment of drought effects on plant covers is the most important issue. This research was conducted in 2015 using the extracted vegetation indices from Moderate Resolution Ima...

متن کامل

Regional Drought Monitoring and Analyzing Using MODIS Data - A Case Study in Yunnan Province

Yunnan suffered from a severe drought from Winter, 2009 to Spring, 2010. Compared with traditional methods for drought monitoring, remote sensing (RS) based methods has the merits of almost real-time and large covering area. In this paper, vegetation water supply index (VWSI) was used to detect the drought condition utilizing Moderate Resolution Imaging Spectroradiometer (MODIS) data in Yunnan ...

متن کامل

Meteorological drought monitoring using several drought indices (case study: Salt Lake Basin in Iran)

Drought detecting is a necessary aspect of drought risk management. It is generally performed usingdifferent drought indices that are effectively continuous functions of rainfall and other hydro- meteorologicalvariables. A number of drought indices have been introduced and used in various countries to date. In thecurrent research, four meteorological drought indices including the standardized p...

متن کامل

Drought Monitoring Using Climatic Indices and Geostatistic Technique (Case Study: Hossein Abad Plain, Sarbisheh, Iran)

Of the many climatic events that influence the Earth’s environment, drought is perhaps the one that is most linked with desertification. Drought is the consequence of a natural reduction in the amount of precipitation received over an extended period, usually a season or more in length. Drought monitoring is an essential component of drought risk management. It is normally performed using vario...

متن کامل

Drought monitoring using MODIS data and its comparison with SPI meteorological index in short periods (Case study: Jaz_Murian basin)

Drought is one of the most important threats for agricultural production in the world, espatially in Iran. This phenomenon has started with reduction of precipitations that lead to a decrease in soil moisture and an increase in soil surface temperature, which affect the vegetation growth. The purpose of this study was to investigate droughts in the Jaz_Murian basin by VHI, VCI, TCI and SPI indi...

متن کامل

Preparation of Rangeland vegetation cover map and monitoring its changes in drought and wet periods using NDVI MODIS product (Case Study: Southern Rangelands of Yazd Province)

Knowledge of rangeland vegetation characteristics as well as factors affecting it in environmental planning, land management and sustainable development is very important. However, regional and up-to-date maps of pasture vegetation cover are not always available. In this study, in order to plot the vegetation cover percentage of the rangelands and monitor its changes in drought and wet periods,...

متن کامل

منابع من

با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید


عنوان ژورنال:
journal of rangeland science

جلد ۷، شماره ۲، صفحات ۱۴۸-۱۵۹

میزبانی شده توسط پلتفرم ابری doprax.com

copyright © 2015-2023