Soumen Maji

• PhD
• Professor (Assistant) at Central Institute of Technology Kokrajhar

The sediment transport rate refers to the quantity of sediment moved by natural processes such as water flow, wind, or ice within a specific timeframe. Rivers, being dynamic systems, undergo constant changes in hydraulics and channel morphology, leading to significant variations in sediment transport rates. The complexity of these dynamics makes it...

Due to disturbance in the equilibrium of an alluvial stream in such a manner that there is either a decrease in sediment load carrying capacity of the stream or increase in the rate of sediment loading over the sediment load carrying capacity of the alluvial stream, aggradation in such stream may occur. This paper presents a study dealing with prob...

Kokrajhar town is the headquarter of the Kokrajhar district as well as the headquarter of Bodoland Territorial Region (BTR) of Assam. BTR situated in the foothills of Bhutan and the northern part of the region faces common problems like flash floods, erosion, and crisis of drinking water. Many areas in Kokrajhar town submerge during the month of Ju...

Assam, one of the northeastern state of India witnesses heavy rainfall almost every year because of its geographical location. Kokrajhar, a district of Assam witnesses flash floods at certain parts of it during rainy season. Detailed study of the reasons for occurrence of flash floods have made and presented in this paper. Incorrect estimation of m...

Agriculture is the highest employment generating sector and the economical backbone of India. Due to the climate change soil erosion is a major concern in this sector. Protecting erosion in vegetated flow land or on the emergent/submerged river bed have been investigated through laboratory experiment. Experimental findings reveal a remarkable obser...

String matching is a common problem in the field of computer science, and it is a common operation in various language processing tasks. Several efficient algorithms have been developed for string matching problems like Knuth-Morris-Pratt (KMP) algorithm [1], Rabin-Karp’s algorithm [2], matching using a finite-state machine, etc. But in natural lan...

Investigation on change in flow characteristics in an open channel flow is important to understand the flowing water ecosystem, which is important in various aspects like sediment deposition and water quality. A significant number of field and laboratory experiments have been carried out to characterize different types of flows in an open channel....

The coronavirus disease 2019 (COVID-19) pandemic is the most rapidly evolving global emergency since March 2020 and one of the most exercised topics in all aspects of the world. So far there are numerous articles that have been published related to COVID-19 in various disciplines of science and social context. Since from the very beginning, researc...

To control the spread of COVID-19, around the world, many countries imposed lockdowns. Numerous studies were reported on COVID-19 in different disciplines with various aspects. The doubling time is a mathematical technique to estimate the current rate of spread of the disease. Researchers used the doubling technique to address the COVID-19 pandemic...

Outbreak of COVID-19, created a disastrous situation in more than 200 countries around the world. Thus the prediction of the future trend of the disease in different countries can be useful for managing the outbreak. Several data driven works have been done for the prediction of COVID-19 cases and these data uses features of past data for future pr...

This review paper addresses the structure of the mean flow and key turbulence quantities in free-surface flows with emergent vegetation. Emergent vegetation in open channel flow affects turbulence, flow patterns, flow resistance, sediment transport, and morphological changes. The last 15 years have witnessed significant advances in field, laborator...

Vegetation in the flow field affects flow hydrodynamics. For example, emergent vegetation patch in the flow field produces changes in river morphology, changes in flow velocity and turbulence. Therefore, investigation of flow characteristics in and around the emergent vegetation patch is a topic of importance. The main aim of this study is to inves...

Vegetation has an important role on erosion and sedimentation of rivers, river bank and marshy lands, etc. This effect depends on type of flow characteristics present in a vegetation patch. However, it’s a great challenge to find out the flow characteristics in the interior of vegetation patch. The objective of this study is to determine the approp...

This present study reports the results of an experimental study characterizing thorough variation of turbulent hydrodynamics and flow distribution in emergent and sparsely vegetated open channel flow. An emergent and rigid sparse vegetation patch with regular spacing between stems along the flow and transverse directions was fixed in the central re...

Important turbulent characteristics are compared between upstream, interior and downstream of a sparse and emergent vegetation patch along the centerline in an open-channel flow. The emergent vegetation patch is made up of seventy uniform rigid acrylic cylindrical rods with regular spacing between two cylinders along streamwise and lateral directio...

Jute plantation is one of the important crops in India and Bangladesh region. The vegetation density of Jute plantations is usually sparse. No comprehensive experimental study has been carried out till date to investigate turbulent characteristics in the lateral direction at interior and exterior of sparse and emergent vegetation patch. The propose...

The present study investigates the turbulent hydrodynamics in an open channel flow with an emergent and sparse vegetation patch placed in the middle of the channel. The dimensions of the rigid vegetation patch are 81 cm long and 24 cm wide and it is prepared by a 7× 10 array of uniform acrylic cylinders by maintaining 9 cm and 4 cm spacing between c...

Jute cultivation is a major crop in India and Bangladesh. Jute plantations belong to the emergent vegetation family and the vegetation density of the jute plantations is usually very sparse. No comprehensive experimental investigation has been carried out so far to compare turbulent hydrodynamics in the lateral direction at the interior and exterio...

This study performs a comprehensive comparison analysis of important turbulent features at upstream, interior and downstream of a sparse vegetation patch in an open channel turbulent flow. The emergent vegetation patch is made by seventy uniform rigid acrylic cylindrical rods together with regular spacing between two cylinders along streamwise and...

Scour is the natural occurrence of lowering the level of riverbeds by erosive action of open channel flow (OCF) due to an obstruction in the flow field. Interactions between the fallen tree across the flow and an erodible bed tend to cause local scouring around the tree. The problem is similar to local scour below pipelines laid across on the river...

In the present study, scour experiments were performed for each of different diameter cylinders for various submergences in the free surface flow over a uniform sand bed with d50 = 0.98 mm. Semi logarithmic equation in the form of Shield’s critical shear velocity was used to estimate the amount of flow between the cylinder and the bed for an equili...

Several methods (Hanmaiahgari et al. 2012) have been proposed to account for unsteady friction effects during pressure surge oscillations. Quasi-two dimensional models (Silva-Araya and Chaudhry 1997; Pezzinga, 1999) provide an accurate and complete description of this phenomenon. However, they are computationally intensive and have not been extende...

The proposed study examined and reviewed the published experimental results related to clear water scour below a cylinder across the flow. It also highlighted the limitations of existing methods for estimating the scour depth below a submerged cylinder. In the present study, experiments were performed for 50% and 75% submergences of a 70 mm diamete...