Dhrubajyoti Sahariah

• M.Phil, PhD.
• Professor (Full) at Gauhati University

Lakes are critical resources that support the ecological balance and provide essential services for human and environmental well-being. However, their quality is being increasingly threatened by both natural and anthropogenic processes. This study aimed to assess the water quality and the presence of heavy metals in 15 lakes in the Vidarbha and Mar...

Flooding is a natural event often associated with floodplain areas, characterised by large, sudden and significant rises in river water levels that drastically alters the surrounding landscape. The research employs ArcGIS tools, multi-criteria evaluation techniques and the Maximum Entropy (MaxEnt) model to assess flood hazard zones. The key physica...

The genus Clausina is one of the important medicinal components of Flora of Assam. In Assam, only three species of Clausina are reported i.e., C. lansium, C. excavata and C. heptaphylla, and all of these species are restricted only a few pockets of forest of Assam. Thus, it is important to conserve this species using appropriate research. The prese...

The present study utilised the Maxent model to predict the distribution of the rattan species Calamus flagellum in Assam to prepare potential distribution and future predictions of suitable zones using bioclimatic variables and CMIP6 environmental models within a GIS framework, focusing on the BCC-CSM2-MR-ssp126 model for the period 2021-2040. Alon...

Urbanisation in Jaipur, Rajasthan’s capital, has significantly impacted land use and land cover (LULC) over the past four decades. This study addresses the pressing issue of how rapid urban expansion affects green spaces and environmental balance. Utilizing satellite imagery and a support vector machine (SVM) algorithm, LULC maps for 1993, 2003, 20...

Trillium govanianum Wall. ex D.Don is an endangered herbaceous species under the family Melanthiaceae, endemic to the Himalayan region of India at an elevation between 2,400–3,500 m. The species is mostly distributed in temperate and sub-alpine zones of the Himalaya. This paper reports an extended distribution of T. govanianum Wall. ex D.Don as a n...

In an era where global biodiversity hotspots are under unprecedented threat, understanding the intricate balance between land use land cover (LULC) changes and their implications on ecosystem services value (ESV) becomes paramount. The region of Jammu and Kashmir, with its distinctive ecological importance, is well known for these challenges and op...

Cephaleuros parasiticus Karst, a parasitic green alga that causes severe damage to agricultural and horticulture crops needs a critical understanding of its dispersion patterns to develop an effective management strategy. This work aimed to examine the potential distribution of C. parasiticus Karst in India using maximum entropy (MaxEnt) modelling...

Soil moisture plays a critical role in agricultural productivity and water resource management, especially in a diverse and populous country like India. Understanding variations in soil moisture across different regions and seasons is essential for adapting agricultural practices and water management strategies to local conditions. This study exami...

This study employed an advanced geospatial methodology using the Google Earth Engine (GEE) platform to assess soil erosion in the Satluj Watershed thoroughly. To achieve this, the Revised Universal Soil Loss Equation (RUSLE) model was integrated into the study, which was revealed through several analytical tiers, each with a unique function. The st...

Identification and mapping of the spatial distribution of species is an important aspect of zoogeographical enquiry. The habitats of many species are facing the threat of depletion in increasingly human-influenced environments. This has already led to the extinction of many species in different localities, making understanding the linkages between...

The present study has shown the changes in climatic variables and land use/land cover to observe the long-term changes in the hydrological characteristics of the Kulsi River. Mann–Kendall test, Expert Team on Climate Change Detection and Indices Index, t tests, and Analysis of variation were used to analyze the change and variation. The Mann–Kendal...

Climate change and anthropogenic factors have exacerbated flood risks in many regions across the globe, including the Himalayan foothill region in India. The Jia Bharali River basin, situated in this vulnerable area, frequently experiences high-magnitude floods, causing significant damage to the environment and local communities. Developing accurat...

Climate change and anthropogenic factors have exacerbated flood risks in many regions across the globe, including the Himalayan foothill region in India. The Jia Bharali River basin, situated in this vulnerable area, frequently experiences high-magnitude floods, causing significant damage to the environment and local communities. Developing accurat...

Floods represent a significant threat to human life, property, and agriculture, especially in low-lying floodplains. This study assesses flood susceptibility in the Brahmaputra River basin, which spans China, India, Bhutan, and Bangladesh—an area notorious for frequent flooding due to the saturation of river water intake capacity. We developed and...

Climate change has signifcantly afected the potential distribution and altitudinal shift of several plant species. Amentotaxus assamicus being one of the critically endangered gymnosperms under the family Taxaceac is restricted only to a few pockets of Arunachal Pradesh with low population size. The current study aims to analyze the current distrib...

Illegal sand mining has been identified as a significant cause of harm to riverbanks, as it leads to excessive removal of sand from rivers and negatively impacts river shorelines. This investigation aimed to identify instances of shoreline erosion and accretion at illegal sand mining sites along the Chambal River. These sites were selected based on...

The alteration of land use and land cover caused by human activities on a global scale has had a notable impact on ecosystem services at regional and global levels, which are crucial for the survival and welfare of human beings. Merbil, a small freshwater wetland located in the Brahmaputra basin in Assam, India, is not exempt from this phenomenon....

Eastern Himalaya, one of the major hubs of plant diversity, is home to numbers of rare, endangered, and threatened plant species in general. The present study aims to study five selected threatened plant species found in Arunachal Pradesh, India for its distribution and potential habitat identification. An extensive field survey was carried out in...

Bank erosion hazard is a frequent occurrence that poses threats to floodplain ecosystems. This analysis examined changes to the Jia Bharali River channel in India using the GIS-based Digital Shoreline Analysis System [DSAS]. The Jia Bharali’s future channel was predicted so as to identify the most erosion-susceptible zones. The rate of bankline mov...

Inland water plants, particularly those that thrive in shallow environments, are vital to the health of aquatic ecosystems. Water hyacinth is a typical example of inland species, an invasive aquatic plant that can drastically alter the natural plant community's floral diversity. The present study aims to assess the impact of water hyacinth biomass...

River bankline migration is a frequent phenomenon in the river of the floodplain region. Nowadays, channel dynamics-related changes in land use and land cover (LULC) are becoming a risk to the life and property of people living in the vicinity of rivers. A comprehensive evaluation of the causes and consequences of such changes is essential for bett...

The Kaziranga Eco-Sensitive Zone is located on the edge of the Eastern Himalayan biodiversity hotspot region. In 1985, the Kaziranga National Park (KNP) was declared a World Heritage Site by UNESCO. Nowadays, anthropogenic interference has created a significant negative impact on this national park. As a result, the area under natural habitat is gr...

Satellite remote sensing and geographic information system (GIS) have revolutionalized the mapping, quantifying, and assessing the land surface processes, particularly analyzing the past and future land use-land cover (LULC) change patterns. Worldwide river basins have observed enormous changes in the land system dynamics as a result of anthropogen...

Tropospheric or ground level ozone (O3) is an important greenhouse gas and a pollutant harmful to human health and agricultural activity. With high population pressure in the Indian Sub-continent and economies heavily reliant on agriculture and allied activities tropospheric ozone is problematic. This analysis assesses the spatial variability of tr...

The present study aims to assess the impact of temperature–rainfall (TR) and land use/land cover (LULC) on the hydrological regime of a forested watershed. The authors consulted meteorological, hydrological, and remote sensing data in this research work. The study applied statistical techniques like regression and analysis of variation (ANOVA), whi...

A common phenomenon associated with alluvial rivers is their meander evolution, eventually forming cutoffs. Point bar deposits and ox-bow lakes are the products of lateral bend migration and meander cutoff. The present study focuses on identifying the meanders of River Manu and their cutoffs. Moreover, this study compares the temporal evolution and...

A common phenomenon associated with alluvial rivers is their meander evolution, eventually forming cutoffs. Point bar deposits and ox-bow lakes are the products of lateral bend migration and meander cutoff. The present study focuses on identifying the meanders of River Manu and their cutoffs. Moreover, this study compares the temporal evolution and...

A common phenomenon associated with alluvial rivers is their meander evolution, eventually forming cutoffs. Point bar deposits and ox-bow lakes are the products of lateral bend migration and meander cutoff. The present study focuses on identifying the meanders of River Manu and their cutoffs. Moreover, this study compares the temporal evolution and...

The present study sought to identify the potential distribution range of critically endangered Gymnocladus assamicus in Arunachal Pradesh based on published data and field collection. We used the Maxent model to estimate the range of distribution and the result was then compared with three other models, i.e., the Generalized Linear Model (GLM), the...

Spatially explicit information on forest management at a global scale is critical for understanding the status of forests, for planning sustainable forest management and restoration, and conservation activities. Here, we produce the first reference data set and a prototype of a globally consistent forest management map with high spatial detail on t...

Disangmukh wetlands are an agglomeration of few wetlands beside the levee region of River Brahmaputra where the tributary Disang meets the Mighty Brahmaputra. The present study examines the physic-chemical properties of water and sees the relationship between water quality and the aquatic macrophytes in the Disangmukh wetland of Assam. The samples...

The river Jiadhal is one of the significant right bank tributaries of the Brahmaputra. It starts from the Arunachal Himalaya, crosses a few km through Arunachal Pradesh and enters the Brahmaputra valley (Assam part) near Jiadhalmukh of Dhemaji district, Assam. The river Jiadhal recurrently inundates vast areas of its basin during the monsoon and pu...

Several global high-resolution built-up surface products have emerged over the last five years, taking full advantage of open sources of satellite data such as Landsat and Sentinel. However, these data sets require validation that is independent of the producers of these products. To fill this gap, we designed a validation sample set of 50 K locati...

The present work examines the potential habitat distribution of Calamus floribundus using the Maxent model in Geographic Information System(GIS) in Assam. For the prediction, 19 bioclimatic variables downloaded from the worldclim website are used. Landuse (MODIS MCD12Q1 Version 6), aspect and slope data are also used for a better prediction. The mo...

Guwahati, a city of 2 million residents is the largest city in northeastern part of India. Situated by the side of River Brahmaputra, the city is of an undulated topography with some hillocks and wetlands. The considerable area of the city is still forested and seven reserve forests are located within the city. The forested topography of the city o...

Riverbank erosion and channel shifting is a common phenomenon faced by alluvial rivers. Through these processes, river channel regulates its morphometry to transport water and sediment flow from its source to mouth. In consequence of this fluvial activity, inhabitants in the adjoining areas of rivers have to endure loss of lives, households, proper...

Majuli, the largest riverine island of the world, and first island district of India located in the Brahmaputra Valley of Assam has been witnessing the unswerving flood and riverbank erosion hazard in the last few decades. In this study, an attempt has been made to use Landsat time-series datasets (Landsat 5 TM and Landsat 8 OLI) for the years 1990...

Increasing human population put a significant impact on wildlife habitats all over the globe. Guwahati, the largest city of NorthEastern part of India experiences the human-leopard conflict from last few decades. Studies advocate that once this region was a suitable abode for many animal species, especially for the leopards. But the growing urban b...

The study examines the effects of urbanization on land surface temperature (LST) in Guwahati, a city in India using satellite data. Landsat images were utilized for LST retrieval, land-use land-cover (LULC) classification and the normalized difference built-up index mapping. Surface Energy Balance Algorithms for Land and support vector machine meth...

The river Jiadhal is one of the major right bank tributaries of the river Brahmaputra. It originates from the Arunachal Himalaya, traverses a few km through Arunachal Pradesh and enters the Brahmaputra valley (Assam part) near Jiadhal Mukh of Dhemaji districts, Assam. Like all the right bank tributaries of the river Brahmaputra, river Jiadhal inund...

Riverbank erosion is one of the key geomorphological problems encountered in the floodplains of the alluvial rivers. Many recent studies on fluvial dynamics have indicated advantages of geospatial technology over traditional techniques in terms of time, cost, and practical usability by the end-users. This study aims to assess the riverbank erosion...

Anthropogenic activities have resulted in manifold land use/land cover (LULC) changes across the globe particularly since the 1980s. In this study, LULC changes of Nagaon district, India were assessed from 1987 to 2013 by using Landsat TM, Landsat ETM+ and Landsat 8 OLI/TIRS images. The study demonstrates the consistent increase of non-forest areas...

Like other ecosystems, wetlands are also confronted to a variety of deterrents leading to its premature degeneration. This paper is an attempt to examine the geo-ecological status of the Hahila beel in Nagaon district, Assam and also the factors responsible for degradation of the wetland so as to provide some measures for its conservation and eco-r...

Soil loss degrades the soil productivity, water quality, causes sedimentation and increase the probability of floods. RUSLE is a widely used model in GIS to predict the soil loss in a particular area. The present study is an attempt to use RUSLE and GIS to estimate annual soil loss from the Jiadhal River Basin for the year 2008 and 2013. Annual rai...

Soil erosion hazard is an environmental problem in diverse geographical areas and oftentimes has repercussions that are felt in downstream areas. This study assesses various aspects of soil erosion in the Jinari River basin in Assam, India using the Universal Soil Loss Equation (USLE) in a GIS environment. The average rainfall erosivity index is fo...

There is an increasing evidence that smallholder farms contribute substantially to food production globally, yet spatially explicit data on agricultural field sizes are currently lacking. Automated field size delineation using remote sensing or the estimation of average farm size at subnational level using census data are two approaches that have b...

Channel migration is one of the main characteristics of the Baralia and Nona rivers of Assam. A study on bank erosion and channel migration of the present courses of the Baralia and Nona rivers indicates that the basin is under active erosion since long. In this study, the rate of channel migration has been assessed and the variation of sinuosity i...

Wetlands forms the crucial part of the natural environment as it involves habitat that supports a wide diversity of flora and fauna. Due to its significance, the study of wetlands is now an important field of research. Deepor Beel, the lone Ramsar site in the Brahmaputra valley has been facing immense pressure in the form of drastic changes of adjo...

Wetlands forms the crucial part of the natural environment as it involves habitat that supports a wide diversity of flora and fauna. Due to its significance, the study of wetlands is now an important field of research. Deepor Beel, the lone Ramsar site in the Brahmaputra valley has been facing immense pressure in the form of drastic changes of adjo...

A global reference data set on cropland was collected through a crowdsourcing campaign using the Geo-Wiki crowdsourcing tool. The campaign lasted three weeks, with over 80 participants from around the world reviewing almost 36,000 sample units, focussing on cropland identification. For quality assessment purposes, two additional data sets are provi...

This chapter outlines how crowdsourcing and Google Earth have been used to create the first global crowdsourced map of human impact. Human impact in this context refers to the degree to which the landscape has been modified by humans as visible from satellite imagery on Google Earth. As human impact is measured on a continuum, it could be used to i...

Rivers are one of the most dynamic entities over the earth's surface. River channels are confined to symmetrical and definite track. They persistently shift their courses over the space through time. A river has its tendency to attain an equilibrium condit geomorphic as well as climatic conditions. Changes in river channel and its immediate surroun...

div class="WordSection1"> Although well established elsewhere, cultural geomorphology has not yet been well-grounded in Northeast India where a perceived dearth of studies in this sub-branch of geography exists. The Brahmaputra valley, which has a long physical and cultural history, is a unique laboratory, which offers opportunities to study anthr...

Land-use/land-cover change is an important agent of ecological degradation in tropical areas where forests are under threat from the pressure of human activities. This study assesses land-use change (1973–2007) in the Nameri Tiger Reserve (NTR) in Assam, India using Landsat imageries. Dense forests decreased sharply while open forest increased marg...

A P e e r R e v i e w e d I n t e r n a t i o n a l J o u r n a l o f A s i a n R e s e a r c h C o n s o r t i u m ABSTRACT Dora Beel, a unique wetland habitat providing plenty of resources and ecological services to the people inhabiting the surrounding region, situated in the Kulsi-Brahmaputra flood plain. The Beel lies between 26°04'48" latitud...