Majid Kiavarz

University of Tehran | UT · Department of Gegraphy

Quantification of Surface Ecological Status (SES) changes is of great importance for understanding human exposure and adaptability to the environment. This study aims to assess the effect of urban growth on spatial and temporal changes of SES over a set of neighboring Iranian cities, Amol, Babol, Qaemshahr, and Sari, which are located in moderate a...

Urbanization and urban population growth are increasing every day across the world. The replacement of natural surfaces with artificial surfaces such as bitumen, asphalt, and cement reduces albedo, increases the land surface temperature (LST), and contributes to creating urban heat islands (UHI). In this study, Landsat satellite time-series images...

Due to the increase in world population, water consumption will increase significantly It has become one of the main problems of drinking water supply. On the one hand, compensable water resources are declining, and on the other hand, in some areas due to drought due to lack of rainfall and lack of access to surface and groundwater resources, dr...

Due to the increase in world population, water consumption will increase significantly It has become one of the main problems of drinking water supply. On the one hand, compensable water resources are declining, and on the other hand, in some areas due to drought due to lack of rainfall and lack of access to surface and groundwater resources, drill...

One of the key parameters that affects the accuracy of Land Surface Temperature (LST) disaggregation is the environmental variables that are fed to the disaggregation model. The aim of this study is to present a new strategy for the disaggregation of LST based on adjacency effects. To do this, a dataset obtained from satellite images and auxiliary...

The purpose of this study is to comprehensively review of Satellite-derived Land Surface Temperature Spatial Sharpening (SLSTSS) studies and provide appropriate solutions to error reduction in SLSTSS presses. Firstly, the initial search was done for the related keywords to SLSTSS, and 391 papers were found over the period 1985 to 2020. Secondly, to...

The normalization of LST relative to environmental parameters is of great importance in various environmental applications. The purpose of this study was to develop a new approach for LST normalization relative to environmental variables. These included topographic variables (i.e. solar irradiance and near-surface temperature lapse rate (NSTLR)) as...

Nowadays, predicting spatial and temporal changes of surface urban heat islands (SUHIs) is both a demanding challenge and a subject of interest for researchers working on urban thermal environments. This study aimed to predict the spatial-temporal changes of SUHI in Tehran city. The research data consisted of Landsat multi-temporal images, MODIS-de...

IntroductionIran is one of the countries that, due to its geographical location, is facing a lot of natural disasters that affect many countries and causes a lot of economic and human losses every year. In recent years, Iran has significantly exposed to floods. Because human activity has concentrated in flood-prone areas, which are often the right...

Urban land surface temperature (ULST) is a key variable for environmental applications and widely used in a variety of fields. However, retrieving ULST with high spatial and temporal resolution is still a challenging task since its a function of surface characteristics and geographical, climatic, and seasonal conditions. Assessing the type and inte...

Improving the spatial resolution of Land Surface Temperature (LST) obtained from satellite images is of great importance in various applications, especially in urban areas. Aiming to bridge the gap in the research background, this study attempted to quantify the effect of landscape metrics on the accuracy of urban LST downscaling. The research data...

Seismic vulnerability assessment of urban buildings is among the most crucial procedures to post-disaster response and recovery of infrastructure systems. The present study proceeds to estimate the seismic vulnerability of urban buildings and proposes a new framework training on the two objectives. First, a comprehensive interpretation of the effec...

The purpose of this study is to present a new approach for satellite imagery-derived Land Surface Temperature (LST) disaggregation based on a decision level integration of various disaggregation strategies. Firstly, common disaggregation models including Global Window Strategy (GWS), Regular Local Window Strategy (RLWS), Object-based Window Strateg...

Mining activities and associated actions cause land-use/land-cover (LULC) changes across the world. The objective of this study were to evaluate the historical impacts of mining activities on surface biophysical characteristics, and for the first time, to predict the future changes in pattern of vegetation cover and land surface temperature (LST)....

The COVID-19 pandemic has caused unprecedent negative impacts on our society, however, evidences show a reduction of anthropogenic pressures on the environment. Due to the high importance of environmental conditions on human life quality, it is crucial to model the impact of COVID-19 lockdown on environmental conditions. Consequently, the objective...

Accurate modeling of Land Surface Ecological Status (LSES) is crucial in environmental applications. Despite valuable benefits, common indices are unable to distinguish LSES of bare soils from lands affected by Anthropogenic Destructive Activities (ADAs). The objective of this study was to present an index to distinguish LSES of different Land Use/...

A set of factors cause the Surface Ecological Status (SES) of urban areas to become largely different from the surrounding rural areas. Hence, the degree of poorness of SES in urban areas versus surrounding rural areas forms a zone, which is named Urban Surface Ecological Poorness Zone (USEPZ). The main objective of this study was to propose a new...

Urban environmental quality (UEQ) is a quantifiable measure of the capacity of an environment to cope with the requirements of an urban population. UEQ can be mapped by way of modeling separate domains of a specific residential area, such as physical environment, buildup areas, infrastructure, natural hazards, etc. Along this thread, the present st...

The surface anthropogenic heat island (SAHI) phenomenon is one of the most important environmental concerns in urban areas. SAHIs play a significant role in quality of urban life. Hence, the quantification of SAHI intensity (SAHII) is of great importance. The impervious surface cover (ISC) can well reflect the degree and extent of anthropogenic act...

Urban Surface Ecological Status (USES) reflects the structure and function of an urban ecosystem. USES is influenced by the surface biophysical, biochemical, and biological properties. The assessment and modeling of USES is crucial for sustainability assessment in support of achieving sustainable development goals such as sustainable cities and com...

Anthropogenic heat flux (AHF) is a main contributor to the formation of surface urban heat islands (SUHI). Megacities in particular are facing severe problems due to excessive population growth, urban area expansion, human activity, increased energy consumption, and increased anthropogenic heat. In this study, a physical modeling approach based on...

The modeling of Near-Surface Temperature Lapse Rate (NSTLR) is of great importance in various environmental applications. This study proposed a new approach for modeling the NSTLR based on the Normalized Land Surface Temperature (NLST). A set of remote sensing imagery including Landsat images, MODIS products, and ASTER Digital Elevation Model (DEM)...

One of the important factors of sustainable development is renewable energies penetration in the energy systems. The present study evaluates the optimum feed-in tariff of photovoltaic electricity production based on the available downward solar radiation potential of each province of Iran while this potential calculated considering geographical, to...

Normalization of the surface temperature relative to environmental parameters is essential in scientific studies and urban and non-urban areas management. The aim of the current study is to propose a variance-based model for normalization of the surface temperature relative to environmental parameters. For this aim, Landsat 8 satellite bands, MODIS...

One of the most important environmental phenomena in urban environments is urban heat island, which plays a big role in understanding anthropogenic activities. The main objective of this study is to present a novel approach based on the differences of the biophysical characteristics between built-up and non-built-up land to model Surface Heat Islan...

Modeling of Near-Surface Temperature Lapse Rate (NSTLR) is very important in various environmental applications. The Land Surface Temperature (LST) is influenced by many properties and conditions including surface biophysical and topographic characteristics. Some researches have considered the LST - Digital Elevation Model (DEM) feature space to mo...

Spatiotemporal mapping and modeling of Land Surface Temperature (LST) variations and characterization of parameters affecting these variations are of great importance in various environmental studies. The aim of this study is a spatiotemporal modeling the impact of surface characteristics variations on LST variations for the studied area in Samalgh...

The main problem using meteorological drought indices include inappropriate distribution of meteorological stations. Satellite data have reliable spatial and temporal resolution and provide valuable information used in many different applications. The Standardized precipitation index has several advantages. The SPI is based on rainfall data alone a...

Building Information Model (BIM) is a database, which makes a detailed 3D geometrical model with rich semantic information of building, go beyond the standard Computer-Aided Design approach. BIM could be as an ideal source to store, formation model and analyses spatial information of internal environments. GIS is an effective tool for analysing the...

Analysis of land surface temperature (LST) spatiotemporal variations and characterization of the factors affecting these variations are of great importance in various environmental studies and applications. The aim of this study is to propose an integrated model for characterizing LST spatiotemporal variations and for assessing the impact of surfac...

The Pars Special Economic Energy Zone (PSEEZ) is the largest global special economic zone in the field of oil, gas, and petrochemical industry. The Nayband national marine park is located in the PSEEZ and mangrove forests are spread throughout the estuaries (Bidkhun or Asaloyeh, Basatin and Haleh) of the park. Despite important goods and ecosystem...

Accurate built-up area extraction is one of the most critical issues in land-cover classification. In previous studies, various techniques have been developed for built-up area extraction using Landsat images. However, the efficiency of these techniques under different technical and geographical conditions, especially for bare and sandy areas, is n...

Introduction Ecosystem services are the benefits people get from ecosystems and human always needs ecosystem services and products for survival. These services are divided into four categories of productive, regulatory, cultural and life support services; the first three categories are directly affecting people, and the fourth one is critical for t...

1. Introduction Land use has always been one of the most important indicators that humans through its have been influenced their environment.Nowadays, processed mining and related operations are parts of activities that have potential to harm the environment. Mining is in direct contact with nature and the environment, so this will have important e...

Study on air temperature is one of the most important topics in climate modeling. Modeling diurnal temperature cycle and its extracted parameters play an important role in environmental science. Previous methods for air temperature modeling are ambiguous in modeling and implementation. Thus, this research suggests a new method, based on two-part fu...

Abstract Introduction In the last decades, the earth’s surface has experienced various changes due to some obscure reason being caused by human activities consisting of deforestation and cities expansion. These widespread human changes pose several adverse problems. For instance, an environmental qualitative decrease which culminates in the reducti...

Energy balance parameters are very important in various applications such as energy global cycle, environment, climatic change monitoring, weather forecast, agriculture. The present study evaluates the influence of topographical conditions on the amount of downward shortwave radiation (SWD) of the surface, as well as the relation between surface Ne...

Nowadays, interlinking of structural, social, environmental and economic aspects of cities is a major problem which results from unplanned horizontal expansion of cities and their land-use changes. The purpose of the present study is to investigate the land use changes and physical expansion of Babol city during the last 30 years and to predict the...

نرمال سازی دمای سطح زمین نسبت به عوامل محیطی از اهمیت بالایی در بسیاری از مطالعات علمی و تصمیمات مدیریتی همچون شناسایی منابع زمین گرمایی، پایش روند تغییرات فعالیت گسل ها و آتشفشان ها، بررسی روند تغییرات آنومالی های حرارتی و مدیریت و برنامه ریزی مصرف منابع انرژی در محیط شهری برخوردار است. هدف این پژوهش، توسعه ی یک مدل فیزیکی جدید بر مبنای معادلات بی...

جزایر حرارتی شهری، از متداول ترین پدیده های شهری اند که در آن ها دمای برخی از مناطق شهری و به خصوص مراکز شهرها، چند درجه از دمای مناطق اطراف بالاتر است. این پدیده به شدت بروی کیفیت زندگی در محیط شهری تاثیر گذاشته و سبب ناهنجاری های زیست محیطی، اجتماعی و اقتصادی زیادی در محیط های شهری می شود. هدف از این پژوهش، ارائه استراتژی جدید برای مدل سازی شدت ج...

The urban heat island is considered as one of the most important climate change phenomena in urban areas, which can result in remarkable negative effects on flora, concentration of pollutants, air quality, energy and water consumption, human health, ecological and economic impacts, and even on global warming. The variation analysis of the surface u...

Biophysical characteristics and surface temperature are the key parameters to monitor and evaluate the physical and chemical processes of the earth's surface. The aim of this study is to investigate the relationship between urban heat island intensity and different biophysical characteristics in built-up and non-built-up lands. For this purpose, th...

Normalization of land surface temperature (LST) relative to environmental factors is of great importance in many scientific studies and applications. The purpose of this study was to develop physical models based on energy balance equations for normalization of satellite derived LST relative to environmental parameters. For this purpose, a set of r...

An urban heat island is one of the most vital environmental risks in urban areas. The aim of this study was to assess the spatial-temporal patterns of land use changes and heat island intensity for the city of Babol, Iran, between 1985 and 2015 and to predict likely future heat island intensity variations. Multi-temporal Landsat images were acquire...

Different spectral indices were provided for the classification of built-up lands using satellite images, but the importance of the blue band in the classification, fusion, and image enhancement prior to the calculation of spectral indices has received less attention so far. This study introduces a new index based on blue band and run it along with...

The purpose of the present study is to combine economic and spatial-based models to determine the optimal price of solar power plants electricity, based on the solar radiation potential in different provinces of Iran. For this purpose, Inverse Distance Weighting (IDW) interpolation method is used to model incoming radiation in Iran scale and to eva...

Land surface temperature plays an important role in the physics of surface atmosphere interactions. It is at the same time a driver and a signature of the energy and mass exchanges over land. Land surface temperature is highly variable in both space and time mainly as a result of the heterogeneity of the meteorological forcing, land cover, soil wat...

Urban heat island is one of the most vital environmental risks in urban areas. The advent of remote sensing technology provides better visibility due to the integrated view, low-cost, fast and effective way to study and monitor environmental changes. The aim of this study is a spatial-temporal evaluation of heat island intensity in the period of 19...

Nowadays, urban sprawl phenomenon have been seen in many of cities in the developing and developed countries. Urban sprawl is considered as a particular kind of urban growth which comes up with a lot of negative effects. The analysis of urban growth using spatial and attribute data of the past and present, is regarded as one of the basic requiremen...

The exploration of geothermal regions is the first step for the use of these resources. This paper attempts to incorporate the concept of risk into the GIS-based analysis for generating geothermal prospectivity maps via Ordered Weighted Averaging (OWA) approach. The use of OWA-based approach provides a model that generates geothermal prospectivity...

Due to high heterogeneity in the land surface properties including variation in the type of surface coverage, varied topography conditions and placement in different geographic locations, investigating the relationship between temperature and net radiation and listed parameters of properties has great importance. The aim of this study is to investi...

Increasing world population and unprecedented expansion of urbanization in the world has caused many environmental problems. The relationship between man and the environment is bidirectional one that have great short-term and long-term impacts on the cities and regions. The best way to deal with it is the participation of the people themselves. The...

Urban heat island is one of the most vital environmental risks in urban areas. The advent of remote sensing technology provides better visibility due to the integrated view, low-cost, fast and effective way to study and monitor environmental and humanistic changes. The aim of this study is a spatiotemporal evaluation of land use changes and the hea...

Multimodal remote sensing approach is based on merging different data in different portions of electromagnetic radiation that improves the accuracy in satellite image processing and interpretations. Remote Sensing Visible and thermal infrared bands independently contain valuable spatial and spectral information. Visible bands make enough informatio...

The air temperature is an essential variable in many applications related to Earth science. Sporadic spatial distribution of weather stations causes a low spatial resolution of measured air temperatures. This study focused on modeling the air diurnal temperature cycle (DTC) based on the land surface temperature (LST) DTC. The air DTC model paramete...

پارامترهای بیلان انرژی دارای اهمیت ویژه ای در کاربردهای مختلف می باشند. هدف از مطالعه حاضر، بررسی تاثیر شرایط توپوگرافی بر مقدار تابش موج کوتاه فرودی به سطح و ارتباط بین تابش خالص سطح با خصوصیات بیوفیزیکی و کاربری اراضی منطقه می¬باشد. برای این منظور، تصویر ماهواره ای لندست 8، محصول بخار آب مودیس و مدل رقومی ارتفاع استفاده شده است. جهت استخراج شار ت...

در سال¬های اخیر به دلیل برتری از نظر هزینه و زمان نسبت به سایر روش¬ها شاهد پیشرفت روزافزون کاربرد پرنده¬های بدون سرنشین در کاربردهای متنوعی از جمله علوم زمین، منابع طبیعی، مطالعات محیطی، برنامه¬ریزی شهری می¬باشیم. در کنار این مزایا، استفاده از پرنده¬های بدون سرنشین¬ با چالش¬هایی مانند هندسه ناپایدار تصویربرداری، عدم استفاده از دوربین¬های متریک و مت...

جزیره حرارتی شهری یکی از مهم‌ترین خطرات زیست محیطی مناطق شهری می¬باشد. سنجش از دور به دلیل فراهم کردن دید یکپارچه، کم‌هزینه و سریع فناوری کارآمد برای مطالعه و پایش تغییرات محیطی محسوب می شود. هدف از این پژوهش حاضر، پایش و پیش بینی تغییرات مکانی-زمانی شدت جزیره حرارتی شهر بابل در بازه زمانی 1424-1364 می باشد. برای این منظور از تصاویر چند زمانه لندست...

جزایر حرارتی شهری از معمول¬ترین پدیده¬های شهری¬اند که پیامدهای ناخوشایند متعددی همچون افت کیفی محیط زیستی را در محدوده شهری به همراه دارد. شدت این پدیده در مناطق مختلف تحت تأثیر برهمکنش رفتار فیزیکی و شیمیایی پدیده¬های مختلف محدوده شهر و حومه آن قرار دارد. هدف از مطالعه حاضر بررسی وضعیت و ارتباط خصوصیات بیوفیزیکی و دمای سطح جهت مقایسه شدت جزیره حرا...

Introduction Concentrations of suspended particles are one of the main indicators of air quality. Suspended particles are formed of a combination of liquid and solid particles with aerodynamic diameter less than 10 micrometers, or less than 2.5 micrometers. A major source of these particles in nature is sea salt, dust, volcanic ashes or sources whi...

Fry analysis and weights of evidence were employed to study the spatial distribution and spatial association between known occurrences of geothermal resources and publicly available geoscience data sets at regional-scale. These analyses support a regional-scale conceptual model of geological, geochemical and geophysical interaction by calculating t...

Defining a comprehensive conceptual model of the resources sought is one of the most important steps in geo-thermal potential mapping. In this study, Fry analysis as a spatial distribution method and 5% well existence, distance distribution, weights of evidence (WofE), and evidential belief function (EBFs) methods as spatial association methods wer...

Fry analysis and weights of evidence were employed to study the spatial distribution and spatial association between known occurrences of geothermal resources and publicly available geoscience data sets at regional-scale. These analyses support a regional-scale conceptual model of geological, geochemical and geophysical interaction by calculating t...

Theme Methods and software tools for real-time data collection, processing and information extraction for disaster monitoring and damages assessment. Abstract Earthquake is one of the inevitable natural hazards that cause lots of damages and problems to the economy, environment and the whole life of people. Therefore, it is necessary to use all ava...