The Investigation of Changes Area and Vegetation of Siahkooh Kavir by Used Remote Sensing Data
مجتبی
یمانی
دانشیار دانشکده جغرافیا، دانشگاه تهران
author
احمد
مزیدی
استادیارگروه جغرافیا، دانشگاه یزد
author
text
article
2008
per
Abstract
A great part of Iran’s area, especially Yazd province is formed as deserted areas. Kavir Siahkooh is one of the most important desert areas of province. The researches show that the arid areas have an ideal condition for remote sensing and it can consider and show the plant coverage of the area .The aim of this study is to evaluate Kavir Siahkooh plant coverage and it’s comprise with the data received from remote sensing. Data used in this research are TM, ETM+ Landsat satellite on the dates September 1990 and 2000.
With the use of vegetation index (NDVI) on two series of satellite data kinds of plants and area are determined. The method of this research is correlation and comparison. The interpretation of data are done through computer ,S.P.S.S software and IDRISI.
The results show that kavir area is not changed in the period of ten years and the best vegetation index is NDVI Index for the study area. Regarding the importance of remote sensing and it application, it is proposed to use the satellite data especially from the images of high resolution and up to date for area of study. Secondly it is proposed that this area Investgate for purposes of soil moisture, salinity and salty crust with remote sensing data.
Keywords : Siahkooh, Kavir, Playa, Remote sensing ,Vegetation index, NDVI, Ardakan.
Physical Geography Research
University of Tehran
2008-630X
0
v.
63
no.
2008
https://jphgr.ut.ac.ir/article_26902_47399d592a1e620d92955f9b7570a64e.pdf
Using Mann-Kendall Test to Recognize of Climate Change in Caspian Sea Southern Coasts
قاسم
عزیزی
دانشیار دانشکده جغرافیای دانشگاه تهران
author
محمود
روشنی
مربی گروه جغرافیای دانشگاه آزاد اسلامی واحد رشت
author
text
article
2008
per
Abstract
With due attention to importance of climate change and natural ecosystem sensibility of the study area, in this research have been studied the probable climatic departure from normal and the existence of trend in climatic time series is detected by statistical tests. The first on the basis of rank- method Mann Kendal, it is tried to identify of changes and then recognize their type and time. The results which are provided of data analysis by this method show that the most changes started as abrupt and it is known that these changes belonged to both type of trend and oscillation. The minimum temperature shows a positive trend and the maximum temperature shows a negative trend in the most of selected stations. Therefore, it seems the range of temperature has reduced during the study period. Also, the percentage of changes on winter and summer has been more than spring and autumn situation. Eventually, there aren’t any coincident between the selected stations for purposes of changes beginning.
Keywords: South coasts of Caspian sea, Climate change, Mann–Kendal, Abrupt change, Trend.
Physical Geography Research
University of Tehran
2008-630X
0
v.
63
no.
2008
https://jphgr.ut.ac.ir/article_26903_8a1dfea6790897c41a596df5bfd86fbc.pdf
Estimating the ُOil Erosion and Production of Sediment in the Basin of the Ilam Dam by using MPSIAC Model
شمس ا...
عسگری
کارشناس ارشد مرکز تحقیقات کشاورزی و منابع طبیعی استان ایلام
author
محمد رضا
ثروتی
دانشیار، دانشگاه شهید بهشتی
author
محمد رضا
جعفری
عضو هیا ت علمی مرکز تحقیقات کشاورزی و منابع طبیعی استان ایلام
author
text
article
2008
per
Physical Geography Research
University of Tehran
2008-630X
0
v.
63
no.
2008
https://jphgr.ut.ac.ir/article_26904_ab8975664e8fe9dc5759b181bc0fdf8f.pdf
Modeling the Thermal Adapability of the Olive (Olea europaea L.) In Iran
حسین
محمدی
دانشیار دانشکده جغرافیای دانشگاه تهران
author
علی اصغر
زینانلو
استادیار موسسه تحقیقات اصلاح و تهیه نهال و بذر
author
علی اصغر
روشن
دانشجوی دکتری اقلیم شناسی دانشگاه تهران و عضو هیات علمی دانشگاه امام حسین(ع) تهران
author
text
article
2008
per
Abstract
Temperature is the most important environmental factor that affects flowering and fruiting. The temperatures induce reproduction and cause damaging to tree or its crop.This paper analyzed daily minimum temperatures 0.0oC, and maximum temperatures 12.5 oC from october 1 to may 31 at nine sites in olive producing and cultivating regions, and one control station, using thermal adaptability model. To determine the probability of high temperature damage during flowering within each region, temperatures equal to or higher than 37.8 oC were considered. To determine damage produced by last frost, temperature equal to or below 0 oC that occurred during flowering within each region, was considered. The model has introduced indicates that Shiraz, Manjil, Gorgan, Gonbad and Sarpol zohab stations show Temperature patern similar to olive producing regions.
Keywords: Temperature; Damage index; Vernalization; Olive, Iran.
Physical Geography Research
University of Tehran
2008-630X
0
v.
63
no.
2008
https://jphgr.ut.ac.ir/article_26905_0f34d7f740e0bf0a6e09fe8befe5c5e2.pdf
Evaluation and Zonation of Effective Factors on Landslide Occurrence of Aladagh Northern Slopes
ابراهیم
مقیمی
دانشیار دانشکده جغرافیا، دانشگاه تهران
author
سیدکاظم علوی
پناه
دانشیار دانشکده جغرافیا، دانشگاه تهران
author
تیمور
جعفری
دانشجوی دکترای جغرافیای طبیعی (ژئومورفولوژی)، دانشگاه تهران
author
text
article
2008
per
Abstract
This survey accomplished for asessment and mechanism recognition of Chenaran watershed landslide effective factors and its zonation based via LIM model. primarily recognized effective factors, through studing and field survey and evaluated by Landslide Index Method(LIM) then based on their weight in model, landslide hazard zonation was done.then evaluated this model competence in zonation,by cross operation between landslides and zonation maps.the results show that, Shurijeh formation(Ksh) consists of clay, marly & evaporites impermiable layers,soluble calcareous sement and maximal weight(Lnwi=2.3341) is very important factor for landslide generating in Chenaran watershed. then aquifers,garden landuse,altitude(1570-1715 meters) and its processes,slope(38-78.8 degrees) ,Chenaran river undercutting and snow cover agent in shape of effective factors at mitigation shearing resistance and augmentation shearing stress have maximal impact at basin,s landslide.about 89.35 percent of basin,s landslides are located in areas with richly potential that shows this model ability at landslide zonation.
Keywords: Chenaran watershed, Aladagh, Factors evaluation, Landslide zonation, LIM model.
Physical Geography Research
University of Tehran
2008-630X
0
v.
63
no.
2008
https://jphgr.ut.ac.ir/article_26906_76b87f8c0c0f61701efc4a985341c133.pdf
Evolution of Coastal Makran Zone During Late Quaternary
احمد
معتمد
استاد دانشکده علوم و فنون دریایی، دانشگاه آزاد اسلامی، واحد تهران شمال
author
محمد رضا غریب
رضا
عضو هیات علمی مرکز تحقیقات حفاظت خاک و آبخیزداری کشور
author
text
article
2008
per
Physical Geography Research
University of Tehran
2008-630X
0
v.
63
no.
2008
https://jphgr.ut.ac.ir/article_26907_6d2ca270bf22916a4f1e24b957b92876.pdf
Assessing the Effects of Land use and Land Cover Change on the Flood Regime of Tajan Basin Using Remote Sensing Technique
منوچهر فرجزاده
اصل
دانشیار گروه سنجش از دور، دانشگاه تربیت مدرس
author
مهنام
فلاح
کارشناسی ارشد سنجش از دور، دانشگاه تربیت مدرس
author
text
article
2008
per
Abstract
In order to study the type and range of the changes in TAJAN basin, in recent year, the images of TM and ETM+ were studied. For assessment of land use changes after enhancement and geometric correction, differencing change detection techniques, false color composite, vegetation index and post- classification comparison methods were used. The result of this study indicates the extended land use changes including decrease of forest extent, rangeland and increase of agricultural land and gardens. Analysis of runoff and rainfall from 1969-1970 to 2000-2001 periods indicates that in spite of decrease of rainfall amounts, the runoff has increased ,while the total mean of vegetation index and the mean of vegetation index of forest and rangeland has decreased about 12.89, 9.85, 34.7 percent respectively. With consideration of stability of topography, slope gradient results show runoff increased in this area due to decrease of vegetation. Therefore climatic and environmental factors had not important role on increase of runoff in studied basin.
keywords: Land use and land cover change, TAJAN, Vegetation index, TM, ETM+ .
Physical Geography Research
University of Tehran
2008-630X
0
v.
63
no.
2008
https://jphgr.ut.ac.ir/article_26908_6d1085b72e3eb525c41979b2383c2010.pdf
Study of Glacial Valley Landform Case study: Sahand Glacial Valleys
معصومه
رجبی
استادیار گروه جغرافیای طبیعی دانشگاه تبریز
author
مریم بیاتی
خطیبی
استادیار گروه جغرافیای طبیعی دانشگاه تبریز
author
text
article
2008
per
Abstract
A mountain glacier, when it occupies a river valley, immediately begins to change the cross-section and profile of that valley. River valleys in mountain areas tends to have V-shaped profiles. Glaciers work to widen as well as deepen their valleys and the typical cross-section of a glacial valley is U-shaped. The U-shaped glacial valley is one of the most characteristic of glacial landforms. With growth and spreading of ice cap in Sahand mountain in late quaternary (wurm), many of Sahand valleys (northern and northern west valleys) have about characteristic of glacial valley. But in comparison with Alpine landscapes, it has rather had development. In fact study of cross-profiles of Sahand glacial valleys and simulation model of form development, shows that these valleys are in third time step. The importance of cross-section of glacial valleys has made it the focus of this study. Therefore models of glacial valley development was used in Sahand glacial valleys. Graf relation, ratio of valley depth to its width, have coincidence only in a few case. Mathematical equation, Y=a Xb (where Y is the vertical, and X the horizontal distances from the midpoint of the valley bottom, a,b are constants) and other equations is used in one relatively typical glacial valley namely Ligvan Chay. Results show there is poor relation. Therefore glacial valley of Sahand mountains have had little evolution.
Keywords: Glacial erosion, Quaternary, Glacial valley, Cross profiles, Sahand mountains.
Physical Geography Research
University of Tehran
2008-630X
0
v.
63
no.
2008
https://jphgr.ut.ac.ir/article_26909_ca41ced3a6dd1b1201d0defcfeb9f928.pdf
Comparison of EPM and MPSIAC Models in GIS & RS for Erosion and Sediment Yield Assessment of the Pegah-Sorkh Basin, Gotvand Area, Khuzestan Province, Iran
کاظم
رنگزن
عضو هیئت علمی دانشگاه شهید چمران اهواز
author
علیرضا
زراسوندی
عضو هیئت علمی دانشگاه شهید چمران اهواز
author
ارسلان
حیدری
کارشناس ارشد سنجش از دور و GIS، استانداری کرمانشاه
author
text
article
2008
per
Abstract
This research was conducted in the Pegah - Sorkh sub-catchments area, a semi-arid region in SW Iran, Using Geographic Information systems (GIS) and Remote Sensing (RS) to compare the Erosion Potential Method (EPM) and Modified Pacific Southwest Interagency Committee (MPSIAC) models in erosion-potential mapping and sediment yield assessment. The study area with approximately 4600 Ha shows different type of lithological units and vegetation covers. Data were collected from available sources were further processed with image processing and field observations. Also all the factors needed for EPM and MPSIAC models were provided using common abilities of RS and GIS. Comparison of the EPM and MPSIAC results with field observation showed that although the results of the two erosion potential maps are very similar, but the results the MPSIAC are reliable in identifying areas with very high erosion potential.
Keywords: Remote Sensing, Erosion, Khuzestan, EPM, MPSIAC.
Physical Geography Research
University of Tehran
2008-630X
0
v.
63
no.
2008
https://jphgr.ut.ac.ir/article_26910_6123ee32792a126cea71f54c23c44001.pdf
Geomorphology and its Related Studies in Iran, After the Islamic Revolution
سید رضا حسین
زاده
استادیار ژئومورفولوژی دانشگاه فردوسی مشهد
author
text
article
2008
per
Abstract
The purpose of this paper is to inform students and researchers of geomorphology from the situation of this science at present and in future, in Iran, after the Islamic Revolution. To fulfill this purpose and to prouide full information about the situation of geomorphology in Iran, various areas of this science are presented chronologically at the begining of the article. The findings of this study shows that, daring the last twenty five years, geomorphological studies were concentrated in the four areas of general geomorphology, fluvial, structuran and mass moments morphology. Other subjects like weathering, wind proce, Coastal, Glacial and applied geomorphology were not considered so much. Although the findings of this article proves that geomorphological studies are started again, after the Islamic Revolution but, still there is a long way to go for achieving the desired situation.
Keywords: Geomorphology, History of geomorphology, Geomorphologic puplications, Geomorphology and projects.
Physical Geography Research
University of Tehran
2008-630X
0
v.
63
no.
2008
https://jphgr.ut.ac.ir/article_26911_1102535d1c6d8fe56beba563044cfee0.pdf
Annual And Seasonal Precipitation Trend Analysis of Some Selective Meteorological Stations In Central Region of Iran Using Non-Poarametric Methods
سهراب
حجام
دانشیار دانشگاه آزاد اسلامی، واحد علوم و تحقیقات
author
یونس
خوشخو
کارشناس ارشد هواشناسی کشاورزی، دانشگاه تهران
author
رضا شمس الدین
وندی
کارشناس ارشد هواشناسی کشاورزی، دانشگاه تهران
author
text
article
2008
per
Abstract
The aim of this paper is to investigate annual and seasonal precipitation trends of some selective meteorological stations of central region in Iran using non-parametric methods. Two non-parametric methods including Mann-Kendall and Sen's estimator slope methods were used here to analyze the seasonal and annual trends of precipitation data. Some 48 meteorological stations in central region of Iran which in the period of (1971-2000) had full records were selected and two mentioned tests were applied and results were compared. The results showed that the application of these two methods is almost similar, although the Sen's estimator slope method showed better performance where the number of zero in the time series of data was considerable. There is a significant negative trend in both tests in some of the time series, but no significant positive trend for both tests was confirmed. Since the number of series with significant trend in comparison to series without any trend was small, therefore a general trend can not be attributed to the region.
Keywords: Trend analysis, Precipitation, Non-parametric Methods, Mann-Kendall, Sen's Estimator Slope.
Physical Geography Research
University of Tehran
2008-630X
0
v.
63
no.
2008
https://jphgr.ut.ac.ir/article_26912_754d2c8a5d06609f97c981e5c6877f1d.pdf
The Investigation of Changes Area and Vegetation of Siahkooh Kavir by Used Remote Sensing Data
عیسی
جوکارسرهنگی
استادیار گروه جغرافیا، دانشگاه مازندران
author
وحید
غلامی
دانشجوی دکتری آبخیزداری
author
محمد بشیر
گنبد
کارشناس ارشد آبخیزداری دانشگاه مازندران
author
text
article
2008
per
Abstract
A great part of Iran’s area, especially Yazd province is formed as deserted areas. Kavir Siahkooh is one of the most important desert areas of province. The researches show that the arid areas have an ideal condition for remote sensing and it can consider and show the plant coverage of the area .The aim of this study is to evaluate Kavir Siahkooh plant coverage and it’s comprise with the data received from remote sensing. Data used in this research are TM, ETM+ Landsat satellite on the dates September 1990 and 2000.
With the use of vegetation index (NDVI) on two series of satellite data kinds of plants and area are determined. The method of this research is correlation and comparison. The interpretation of data are done through computer ,S.P.S.S software and IDRISI.
The results show that kavir area is not changed in the period of ten years and the best vegetation index is NDVI Index for the study area. Regarding the importance of remote sensing and it application, it is proposed to use the satellite data especially from the images of high resolution and up to date for area of study. Secondly it is proposed that this area Investgate for purposes of soil moisture, salinity and salty crust with remote sensing data.
Keywords : Siahkooh, Kavir, Playa, Remote sensing ,Vegetation index, NDVI, Ardakan.
Physical Geography Research
University of Tehran
2008-630X
0
v.
63
no.
2008
https://jphgr.ut.ac.ir/article_26913_e99567bc5b7841eff3e5028d1804e88f.pdf