تحقیقات کاربردی علوم جغرافیایی

تحقیقات کاربردی علوم جغرافیایی

بهره گیری از شاخص های NDVI، VTCI و WDI در تجزیه وتحلیل اثرات شدت و مدت خشکسالی بر تراکم پوشش گیاهی در حوضه آبریز سیمینه رود

نویسنده
پرویز ضیائیان فیروزآبادی
دانشیار گروه سنجش از دور و سیستم اطلاعات جغرافیایی دانشگاه خوارزمی، تهران، ایران
10.29252/jgs.20.59.371
چکیده
داده ها، تصاویر و محصولات متنوع سنجش از دور ماهواره ای از زمان تولید این نوع منابع اطلاعاتی، جایگاه خود را در مطالعات خشکی،خشکسالی و کشاورزی به اثبات رسانیده است. در این میان باندهای مرئی، مادون قرمز نزدیک و حرارتی در تولید محصولاتی چون پوشش گیاهی و دمای سطح زمین از پرکاربردترین آنها محسوب میشوند. در این تحقیق، از داده های سنجنده MODIS به منظور بررسی و یافتن ضرایب رابطه فضایی اندکس پوشش گیاهی-دمای سطح( NDVI-TS) و NDVI- ΔTS برای استخراج زمان وقوع خشکسالی کشاورزی از ژوئن تا اکتبر سال های 2007 تا 2010 در حوضه آبریز سیمینه رود استفاده شده است، شاخص­ شرایط دما–پوشش گیاهی( VTCI)و شاخص کمبود آب( WDI )که قادر به شناسایی تنش خشکی در مقیاس منطقه ای هستند از آنهااستخراج شده اند. نتیجه این تحقیق نشان داد، که در هردو شاخص، وضعیت تنش خشکی در سال های 2007 و 2008 بیشتر بوده است. همچنین بر اساس رابطه فضای NDVI-TS در تمام سال های 2007 تا 2010 شیب بالایی فضای مثلثی برای لبه گرم منفی است. این بدان معناست که با افزایش NDVI میزان LST کاهش یافته است درحالیکه برای لبه سرد شیب مثبت است. همچنین شیب به دست آمده از رابطه فضای NDVI-ΔTS برای خط خشک منفی است یعنی خط خشک یا خط حداقل تعریق-تعرق( ETR)یک همبستگی منفی با NDVI را نشان می دهد. درحالیکه برای خط مرطوب بالاخص در سال 2010 شیب مثبت بوده و در بقیه سال ها تغییر محسوسی دیده نمی شود. پژوهش حاضر نشان داد، مقدار آستانه VTCI برای تنش خشکی در سال 2007 و 2008 شدید بوده است.
کلیدواژه‌ها
داده های MODIS
خشکسالی کشاورزی
NDVI
VTCI
WDI
حوضه آبریز سیمینه رود

عنوان مقاله English

Utilization of NDVI, VTCI and WDI indices in analyzing the effects of drought severity and duration on vegetation density in Siminehrood catchment

نویسنده English

Parviz zeaiean Firoozabadi
Associate Professor, Department of Remote Sensing and Geographic Information System , Kharazmi University
چکیده English

Various satellite remote sensing data, images and products have proven their place in drought, drought and agriculture studies since the production of this type of information resource. Visible, near-infrared and thermal bands are among the most widely used in the production of products such as vegetation and surface temperature. In this study, from MODIS sensor data to investigate and find the coefficients of spatial relationship between vegetation-surface temperature index (NDVI-TS) and NDVI-ΔTS to extract the time of agricultural drought from June to October 2007 to 2010 in the catchment Siminehrood has been extracted from the Temperature-Vegetation Condition Index (VTCI) and the Water Lack Index (WDI), which are able to detect drought stress on a regional scale. The results of this study showed that in both indicators, the drought stress situation was higher in 2007 and 2008. Also based on the NDVI-TS space relationship in all the years 2007 to 2010 the high slope of the triangular space for the hot edge is negative. This means that with increasing NDVI, the LST level decreases while for the cold edge the slope is positive. In addition, the slope obtained from the NDVI-ΔTS space relationship is negative for the dry line, ie the dry line or the minimum transpiration-sweat line (ETR) shows a negative correlation with NDVI. While for the wet line, especially in 2010, the slope is positive and in other years, no significant change is seen. The present study showed that the VTCI threshold for drought stress was severe in 2007 and 2008.

کلیدواژه‌ها English

MODIS data
agricultural drought
NDVI
VTCI
WDI
Siminehroud catchment
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